29 changed files with 992 additions and 1806 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +0,0 @@
-build/
-sandbox/
-VERSION
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@ -1,17 +0,0 @@
-{
-    "configurations": [
-        {
-            "name": "Linux",
-            "includePath": [
-                "${default}"
-            ],
-            "defines": [],
-            "compilerPath": "/usr/bin/gcc",
-            "cStandard": "gnu17",
-            "cppStandard": "gnu++14",
-            "intelliSenseMode": "linux-gcc-x64",
-            "configurationProvider": "ms-vscode.cmake-tools"
-        }
-    ],
-    "version": 4
-}
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@ -1,52 +0,0 @@
-{
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "(gdb) start kNCursesDemoApp",
-            "type": "cppdbg",
-            "request": "launch",
-            "program": "${workspaceFolder}/build/kNCursesDemoApp",
-            "args": [],
-            "stopAtEntry": false,
-            "cwd": "${workspaceFolder}",
-            "environment": [],
-            "externalConsole": true,
-            "MIMode": "gdb",
-            "setupCommands": [
-                {
-                    "description": "Automatische Strukturierung und Einrückung für \"gdb\" aktivieren",
-                    "text": "-enable-pretty-printing",
-                    "ignoreFailures": true
-                },
-                {
-                    "description":  "Disassemblierungsvariante auf Intel festlegen",
-                    "text": "-gdb-set disassembly-flavor intel",
-                    "ignoreFailures": true
-                }
-            ]
-        },
-        {
-            "name": "(gdb) attach to running kNCursesDemoApp",
-            "type": "cppdbg",
-            "request": "attach",
-            "program": "${workspaceFolder}/build/kNCursesDemoApp",
-            "processId": "${command:pickProcess}",
-            "MIMode": "gdb",
-            "setupCommands": [
-                {
-                    "description": "Automatische Strukturierung und Einrückung für \"gdb\" aktivieren",
-                    "text": "-enable-pretty-printing",
-                    "ignoreFailures": true
-                },
-                {
-                    "description":  "Disassemblierungsvariante auf Intel festlegen",
-                    "text": "-gdb-set disassembly-flavor intel",
-                    "ignoreFailures": true
-                }
-            ]
-        },
-    ]
-}
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@ -1,66 +0,0 @@
-{
-    "cmake.configureOnOpen": true,
-    "files.associations": {
-        "*.tcc": "cpp",
-        "fstream": "cpp",
-        "iosfwd": "cpp",
-        "istream": "cpp",
-        "limits": "cpp",
-        "sstream": "cpp",
-        "streambuf": "cpp",
-        "filesystem": "cpp",
-        "cstdio": "cpp",
-        "thread": "cpp",
-        "exception": "cpp",
-        "memory_resource": "cpp",
-        "new": "cpp",
-        "ostream": "cpp",
-        "array": "cpp",
-        "atomic": "cpp",
-        "bit": "cpp",
-        "cctype": "cpp",
-        "chrono": "cpp",
-        "clocale": "cpp",
-        "cmath": "cpp",
-        "codecvt": "cpp",
-        "cstdarg": "cpp",
-        "cstddef": "cpp",
-        "cstdint": "cpp",
-        "cstdlib": "cpp",
-        "cstring": "cpp",
-        "ctime": "cpp",
-        "cwchar": "cpp",
-        "cwctype": "cpp",
-        "deque": "cpp",
-        "unordered_map": "cpp",
-        "vector": "cpp",
-        "algorithm": "cpp",
-        "functional": "cpp",
-        "iterator": "cpp",
-        "memory": "cpp",
-        "numeric": "cpp",
-        "optional": "cpp",
-        "random": "cpp",
-        "ratio": "cpp",
-        "string": "cpp",
-        "string_view": "cpp",
-        "system_error": "cpp",
-        "tuple": "cpp",
-        "type_traits": "cpp",
-        "utility": "cpp",
-        "initializer_list": "cpp",
-        "iomanip": "cpp",
-        "iostream": "cpp",
-        "stdexcept": "cpp",
-        "typeinfo": "cpp",
-        "pointers": "cpp",
-        "list": "cpp",
-        "condition_variable": "cpp",
-        "mutex": "cpp",
-        "gsl_util": "cpp"
-    },
-    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
-    "C_Cpp.default.includePath": [
-        "${workspaceFolder}/include"
-    ]
-}
--- a/App.cpp
+++ b/App.cpp
@ -0,0 +1,63 @@
+/**
+ * @author Christian Burger (christian@krikkel.de)
+ */
+
+#include "App.hpp"
+#include "Debug.hpp"
+#include <NCursesPtyWindow/Window.hpp>
+
+#include <unistd.h>
+#include <utmp.h>
+#include <cstdlib>
+
+namespace krikkel::NCursesPtyWindow
+{
+    App::App() : NCursesApplication(false)
+    {
+
+    }
+
+    int App::run()
+    {
+        std::mutex writeMutex;
+
+        Window *ptyWindow = new Window(&writeMutex
+              , Root_Window->lines()
+              , Root_Window->cols()
+              , 0
+              , 0);
+
+        if(fork() == 0)
+        {
+            const char *shellPath = getenv("SHELL");
+            if(!shellPath)
+                shellPath = "/bin/bash";
+
+            login_tty(ptyWindow->getFdPtyClient());
+            const int sizeArg = 2;
+            const char *arg[sizeArg] = {shellPath, NULL};
+            fprintf(stderr, "<CTRL>+C exits shell.\n\n");
+            execv(shellPath, const_cast<char * const *>(arg));
+            fprintf(stderr, "Well, well, well … could not start a shell. We "
+                            "tried `%s`. Maybe set `SHELL` environment variable"
+                            " to a working value?", shellPath);
+            exit(1);
+        }
+
+        while(true)
+        {
+            SingleUserInput input = ptyWindow->readSingleUserInput();
+            if(input.isNormalKey())
+                ptyWindow->writeUnicodeCharToClient(input.getRawInput());
+            if(input.isFunctionKey())
+            {
+                if(input.getRawInput() == KEY_RESIZE)
+                    ptyWindow->wresize(Root_Window->lines(), Root_Window->cols());
+                else
+                    ptyWindow->writeKeyToClient(input.mapKeyNcursesToVTerm());
+            }
+        }
+
+        return 0;
+    }
+}
--- a/App.hpp
+++ b/App.hpp
@ -0,0 +1,23 @@
+/**
+ * @brief demo application for the library
+ * @author Christian Burger (christian@krikkel.de)
+ */
+
+#ifndef A3B2AE4E_0A39_468C_8CCA_E6508166702A
+#define A3B2AE4E_0A39_468C_8CCA_E6508166702A
+
+#include <cursesapp.h>
+
+namespace krikkel::NCursesPtyWindow
+{
+    class App : public NCursesApplication
+    {
+        public:
+            App();
+
+        private:
+            int run() override;
+    };
+}
+
+#endif /* A3B2AE4E_0A39_468C_8CCA_E6508166702A */
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -4,8 +4,8 @@
 cmake_minimum_required(VERSION 3.16.3)

 include("cmake/version.cmake")
-project(kNCurses
-        HOMEPAGE_URL "https://gitea.xndr.de/christian/kNCurses"
+project(NCursesPtyWindow
+        HOMEPAGE_URL "https://gitea.xndr.de/christian/NCursesPtyWindow"
        VERSION ${SEMANTIC_VERSION})

 set(CMAKE_CXX_STANDARD 17)
@ -13,62 +13,42 @@ set(CMAKE_CXX_STANDARD 17)
 include(CTest)
 enable_testing()

-add_library(kNCurses src/krikkel/NCurses/Window.cpp
-                     src/krikkel/NCurses/PtyWindow.cpp
-                     src/krikkel/NCurses/SingleUserInput.cpp
-                     src/krikkel/NCurses/TilingWindowManager.cpp
-                     src/krikkel/NCurses/VerticalTilingWindowManager.cpp
-                     src/krikkel/NCurses/HorizontalTilingWindowManager.cpp
-                     src/krikkel/Debug.cpp
-                     )
+add_library(NCursesPtyWindow Window.cpp SingleUserInput.cpp Debug.cpp)

-### let's be annoyingly pedantic
-target_compile_options(kNCurses PRIVATE "-Wall" "-Wextra" "-Werror" "-pedantic")
-
-### path to own includes
-include_directories("${CMAKE_SOURCE_DIR}/include")
+### path to own system includes
+include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/include")

 ### libraries

 include("cmake/ncurses.cmake")
-target_link_libraries(kNCurses ${CURSES_LIBRARIES})
+target_link_libraries(NCursesPtyWindow ${CURSES_LIBRARIES})

 include("cmake/gsl.cmake")

 include("cmake/libvterm.cmake")
 if(EXISTS libvtermProject)
-    add_dependencies(kNCurses libvtermProject)
+    add_dependencies(NCursesPtyWindow libvtermProject)
 endif()
-target_link_libraries(kNCurses ${LIBVTERM_LIBRARY})
+target_link_libraries(NCursesPtyWindow ${LIBVTERM_LIBRARY})

 find_library(UTIL_LIBRARY util)
-target_link_libraries(kNCurses ${UTIL_LIBRARY})
+target_link_libraries(NCursesPtyWindow ${UTIL_LIBRARY})

 set(THREADS_PREFER_PTHREAD_FLAG true)
 find_package(Threads REQUIRED)
-target_link_libraries(kNCurses Threads::Threads)
+target_link_libraries(NCursesPtyWindow Threads::Threads)

 ### demo application
-add_executable(kNCursesDemoApp src/krikkel/NCurses/main.cpp
-                               src/krikkel/NCurses/DemoApp.cpp)
-target_compile_options(kNCursesDemoApp PRIVATE "-Wall" "-Wextra" "-Werror" "-pedantic")
-target_link_libraries(kNCursesDemoApp kNCurses)
+add_executable(NCursesPtyApp main.cpp App.cpp)
+target_link_libraries(NCursesPtyApp NCursesPtyWindow)

 ### installation and packaging
-set(KNCURSES_SYSTEM_INCLUDE "include/kNCurses")
-string(CONCAT KNCURSES_PUBLIC_HEADERS "${KNCURSES_SYSTEM_INCLUDE}/Window.hpp;"
-                                      "${KNCURSES_SYSTEM_INCLUDE}/SingleUserInput.hpp;"
-                                      "${KNCURSES_SYSTEM_INCLUDE}/PtyWindow.hpp;"
-                                      "${KNCURSES_SYSTEM_INCLUDE}/TilingWindowManager.hpp;"
-                                      "${KNCURSES_SYSTEM_INCLUDE}/VerticalTilingWindowManager.hpp;"
-                                      "${KNCURSES_SYSTEM_INCLUDE}/HorizontalTilingWindowManager.hpp;"
-                                      )
-set_target_properties(kNCurses PROPERTIES
-        PUBLIC_HEADER "${KNCURSES_PUBLIC_HEADERS}"
-        VERSION "${CMAKE_PROJECT_VERSION}")
+set(NCURSES_PTY_WINDOW_SYSTEM_INCLUDE "include/NCursesPtyWindow")
+set_target_properties(NCursesPtyWindow PROPERTIES PUBLIC_HEADER "${NCURSES_PTY_WINDOW_SYSTEM_INCLUDE}/Window.hpp;${NCURSES_PTY_WINDOW_SYSTEM_INCLUDE}/SingleUserInput.hpp"
+                                       VERSION "${CMAKE_PROJECT_VERSION}")
 include(GNUInstallDirs)
-install(TARGETS kNCurses kNCursesDemoApp ARCHIVE
-                                 PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/kNCurses/")
+install(TARGETS NCursesPtyWindow ARCHIVE
+                                 PUBLIC_HEADER DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/NCursesPtyWindow/")

 set(CPACK_PROJECT_NAME ${PROJECT_NAME})
 set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
--- a/Debug.cpp
+++ b/Debug.cpp
@ -0,0 +1,503 @@
+/**
+ * @author Christian Burger (christian@krikkel.de)
+ * @todo Switch over to <seccomp.h>? For resolving system call numbers?
+ *       Maybe keep the current solution as a fallback?
+ * @todo catch `out of range` exception from stoi()
+ *
+ * Contains mapping of system calls numbers to names from original dev system:
+ *      "Linux 5.13.0-28-generic #31~20.04.1-Ubuntu SMP \
+ *       Wed Jan 19 14:08:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux"
+ * See comment at the end for the actual command to gather mapping information.
+ */
+
+#ifndef NDEBUG
+
+#include "Debug.hpp"
+
+#include <algorithm>
+#include <cstring>
+#include <filesystem>
+#include <cstdio>
+#include <syscall.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define BUFFER_SIZE 128
+
+namespace krikkel
+{
+    using std::string;
+    using std::fstream;
+    using std::filesystem::is_directory;
+    using std::endl;
+    using std::time;
+    using std::localtime;
+    using std::strftime;
+    using std::min;
+
+    Debug::Debug()
+    {
+        string directory = ".";
+        if(is_directory("sandbox"))
+            directory = "./sandbox";
+        logFile = fstream(directory + "/debug.log", fstream::out | fstream::app);//| fstream::trunc);
+        logFile << endl << endl << endl << endl << "New instance of class Debug." << endl;
+        logFile << getUname();
+        logFile.flush();
+    }
+
+    string Debug::getUname()
+    {
+        string result = "";
+        char buffer[BUFFER_SIZE];
+        FILE *unameProcess = popen("uname -srvmpio", "r");
+
+        if(unameProcess && fgets(buffer, BUFFER_SIZE, unameProcess))
+            result = buffer;
+        pclose(unameProcess);
+
+        return result;
+    }
+
+    string Debug::getTimestamp()
+    {
+        time_t now = time(NULL);
+        tm *localNow = localtime(&now);
+        static char formattedLocalNow[32];
+        strftime(formattedLocalNow, 32, "%c", localNow);
+
+        return formattedLocalNow;
+    }
+
+    void Debug::log(string message, string fileName, int lineNo, string functionName)
+    {
+        string output = "";
+        size_t position = message.find("sysCall(");
+
+        if(position != string::npos)
+        {
+            size_t end = message.find_first_not_of("0123456789", position + 8);
+            unsigned long long systemCallNumber = std::stoi(message.substr(position + 8, end - position - 8));
+            string systemCallName = strlen(syscalls[systemCallNumber]) != 0 ? syscalls[systemCallNumber]
+                                                                     : "unknown_system_call";
+            if(systemCallNumber < MAX_NUMBER_OF_SYSCALLS)
+                output = message.replace(position, end - position + 1, systemCallName + "(");
+        }
+        if(output == "")
+            output = message;
+
+        logFile << getTimestamp() << ": " << output << " (in "
+                << fileName.substr(fileName.rfind('/') + 1) << ":"
+                << lineNo << " in " << functionName << "())" << endl;
+        logFile.flush();
+    }
+
+    std::string Debug::peekData(pid_t shellPid, void *data, size_t length)
+    {
+        std::string result;
+
+        for(int index = 0; index < length / sizeof(long); ++index)
+        {
+            long datum = ptrace(PTRACE_PEEKDATA, shellPid, ((char *) data) + index * sizeof(long));
+            if(length == -1)
+            {
+                size_t datumLength = strnlen((char *) &datum, sizeof(long));
+                result += string((char *) &datum, datumLength);
+                if(datumLength < sizeof(long))
+                    break;
+            }
+            else
+                result += string((char *) &datum, sizeof(long));
+        }
+
+        return result;
+    }
+
+    std::string Debug::formatToAddress(unsigned long long address)
+    {
+        char addressString[17];
+
+        snprintf(addressString, 17, "%016llx", address);
+
+        return string("0x") + addressString;
+    }
+
+    void Debug::logPtraceSysCall(pid_t shellPid, uint16_t sysCallId, bool returnedFromSysCall, unsigned long long result, unsigned long long firstArgument, unsigned long long secondArgument, unsigned long long thirdArgument, unsigned long long fourthArgument, std::string fileName, int lineNo, std::string functionName)
+    {
+        const static uint8_t maxStringLength = 32;
+        string message = "syscall: ";
+
+        string sysCallName;
+        if(sysCallId < MAX_NUMBER_OF_SYSCALLS)
+            sysCallName = syscalls[sysCallId];
+        if(sysCallName.empty())
+            sysCallName = "syscall" + std::to_string(sysCallId);
+
+
+        switch(sysCallId)
+        {
+            case SYS_read:
+                if(returnedFromSysCall)
+                    message += (result == -1 ? "-1" : std::to_string((size_t) result)) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", \"" + (returnedFromSysCall ? __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength))) : "")
+                        + (maxStringLength < thirdArgument || returnedFromSysCall == true ? "[…]" : "") + "\""
+                        + ", " + std::to_string((size_t) thirdArgument)
+                        + ")";
+                break;
+            case SYS_write:
+                if(returnedFromSysCall)
+                    message += (result == -1 ? "-1" : std::to_string((size_t) result)) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength)))
+                        + (maxStringLength < thirdArgument || returnedFromSysCall == true ? "[…]" : "") + "\""
+                        + ", " + std::to_string((size_t) thirdArgument)
+                        + ")";
+                break;
+            case SYS_close:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ")";
+                break;
+            case SYS_stat:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(\"" + peekData(shellPid, (char *) firstArgument, -1) + "\""
+                        + ", " + formatToAddress(secondArgument)
+                        + ")";
+                break;
+            case SYS_fstat:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", " + formatToAddress(secondArgument)
+                        + ")";
+                break;
+            case SYS_openat:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + ((int) firstArgument == AT_FDCWD ? string("AT_FDCWD") : std::to_string((int) firstArgument))
+                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, -1)) + "\""
+                        + ", " + std::to_string((int) thirdArgument)
+                        + ")";
+                break;
+            case SYS_rt_sigprocmask:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", " + formatToAddress(secondArgument)
+                        + ", " + formatToAddress(thirdArgument)
+                        + ", " + std::to_string((size_t) fourthArgument)
+                        + ")";
+                break;
+            case SYS_access:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + peekData(shellPid, (char *) firstArgument, -1)
+                        + ", " + std::to_string((int) secondArgument)
+                        + ")";
+                break;
+            case SYS_dup2:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", " + std::to_string((int) secondArgument)
+                        + ")";
+                break;
+            case SYS_fcntl:
+                if(returnedFromSysCall)
+                    message += std::to_string((int) result) + " = ";
+                message += sysCallName
+                        + "(" + std::to_string((int) firstArgument)
+                        + ", " + (secondArgument == 0 ? string("F_DUP_FD") :  std::to_string((int) secondArgument))
+                        + ", …"
+                        + ")";
+                break;
+/*            case SYS_fstat:
+                struct stat statbuf;
+                message += "(" + std::to_string(firstArgument)
+                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength)))
+                        + (maxStringLength < thirdArgument ? "[…]" : "") + "\""
+                        + ", " + std::to_string((size_t) thirdArgument)
+                        + ")";
+                break;
+*/            default:
+                if(returnedFromSysCall)
+                    message += (result == -1 ? "-1" : std::to_string(result)) + " = ";
+                message += sysCallName
+                        + "(" + formatToAddress(firstArgument)
+                        + ", " + formatToAddress(secondArgument)
+                        + ", " + formatToAddress(thirdArgument)
+                        + ", " + formatToAddress(fourthArgument)
+                        + ")";
+        }
+        // source: https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
+
+        log(message, fileName, lineNo, functionName);
+    }
+
+    Debug *Debug::getInstance()
+    {
+        static Debug *debug = new Debug();
+        return debug;
+    }
+
+    const char *Debug::syscalls[MAX_NUMBER_OF_SYSCALLS] = {[0] = "read",[1] = "write",
+                    [2] = "open",[3] = "close",
+                    [4] = "stat",[5] = "fstat",
+                    [6] = "lstat",[7] = "poll",
+                    [8] = "lseek",[9] = "mmap",
+                    [10] = "mprotect",[11] = "munmap",
+                    [12] = "brk",[13] = "rt_sigaction",
+                    [14] = "rt_sigprocmask",[15] = "rt_sigreturn",
+                    [16] = "ioctl",[17] = "pread64",
+                    [18] = "pwrite64",[19] = "readv",
+                    [20] = "writev",[21] = "access",
+                    [22] = "pipe",[23] = "select",
+                    [24] = "sched_yield",[25] = "mremap",
+                    [26] = "msync",[27] = "mincore",
+                    [28] = "madvise",[29] = "shmget",
+                    [30] = "shmat",[31] = "shmctl",
+                    [32] = "dup",[33] = "dup2",
+                    [34] = "pause",[35] = "nanosleep",
+                    [36] = "getitimer",[37] = "alarm",
+                    [38] = "setitimer",[39] = "getpid",
+                    [40] = "sendfile",[41] = "socket",
+                    [42] = "connect",[43] = "accept",
+                    [44] = "sendto",[45] = "recvfrom",
+                    [46] = "sendmsg",[47] = "recvmsg",
+                    [48] = "shutdown",[49] = "bind",
+                    [50] = "listen",[51] = "getsockname",
+                    [52] = "getpeername",[53] = "socketpair",
+                    [54] = "setsockopt",[55] = "getsockopt",
+                    [56] = "clone",[57] = "fork",
+                    [58] = "vfork",[59] = "execve",
+                    [60] = "exit",[61] = "wait4",
+                    [62] = "kill",[63] = "uname",
+                    [64] = "semget",[65] = "semop",
+                    [66] = "semctl",[67] = "shmdt",
+                    [68] = "msgget",[69] = "msgsnd",
+                    [70] = "msgrcv",[71] = "msgctl",
+                    [72] = "fcntl",[73] = "flock",
+                    [74] = "fsync",[75] = "fdatasync",
+                    [76] = "truncate",[77] = "ftruncate",
+                    [78] = "getdents",[79] = "getcwd",
+                    [80] = "chdir",[81] = "fchdir",
+                    [82] = "rename",[83] = "mkdir",
+                    [84] = "rmdir",[85] = "creat",
+                    [86] = "link",[87] = "unlink",
+                    [88] = "symlink",[89] = "readlink",
+                    [90] = "chmod",[91] = "fchmod",
+                    [92] = "chown",[93] = "fchown",
+                    [94] = "lchown",[95] = "umask",
+                    [96] = "gettimeofday",[97] = "getrlimit",
+                    [98] = "getrusage",[99] = "sysinfo",
+                    [100] = "times",[101] = "ptrace",
+                    [102] = "getuid",[103] = "syslog",
+                    [104] = "getgid",[105] = "setuid",
+                    [106] = "setgid",[107] = "geteuid",
+                    [108] = "getegid",[109] = "setpgid",
+                    [110] = "getppid",[111] = "getpgrp",
+                    [112] = "setsid",[113] = "setreuid",
+                    [114] = "setregid",[115] = "getgroups",
+                    [116] = "setgroups",[117] = "setresuid",
+                    [118] = "getresuid",[119] = "setresgid",
+                    [120] = "getresgid",[121] = "getpgid",
+                    [122] = "setfsuid",[123] = "setfsgid",
+                    [124] = "getsid",[125] = "capget",
+                    [126] = "capset",[127] = "rt_sigpending",
+                    [128] = "rt_sigtimedwait",[129] = "rt_sigqueueinfo",
+                    [130] = "rt_sigsuspend",[131] = "sigaltstack",
+                    [132] = "utime",[133] = "mknod",
+                    [134] = "uselib",[135] = "personality",
+                    [136] = "ustat",[137] = "statfs",
+                    [138] = "fstatfs",[139] = "sysfs",
+                    [140] = "getpriority",[141] = "setpriority",
+                    [142] = "sched_setparam",[143] = "sched_getparam",
+                    [144] = "sched_setscheduler",[145] = "sched_getscheduler",
+                    [146] = "sched_get_priority_max",[147] = "sched_get_priority_min",
+                    [148] = "sched_rr_get_interval",[149] = "mlock",
+                    [150] = "munlock",[151] = "mlockall",
+                    [152] = "munlockall",[153] = "vhangup",
+                    [154] = "modify_ldt",[155] = "pivot_root",
+                    [156] = "",[157] = "prctl",
+                    [158] = "arch_prctl",[159] = "adjtimex",
+                    [160] = "setrlimit",[161] = "chroot",
+                    [162] = "sync",[163] = "acct",
+                    [164] = "settimeofday",[165] = "mount",
+                    [166] = "",[167] = "swapon",
+                    [168] = "swapoff",[169] = "reboot",
+                    [170] = "sethostname",[171] = "setdomainname",
+                    [172] = "iopl",[173] = "ioperm",
+                    [174] = "",[175] = "init_module",
+                    [176] = "delete_module",[177] = "",
+                    [178] = "",[179] = "quotactl",
+                    [180] = "",[181] = "",
+                    [182] = "",[183] = "",
+                    [184] = "",[185] = "",
+                    [186] = "gettid",[187] = "readahead",
+                    [188] = "setxattr",[189] = "lsetxattr",
+                    [190] = "fsetxattr",[191] = "getxattr",
+                    [192] = "lgetxattr",[193] = "fgetxattr",
+                    [194] = "listxattr",[195] = "llistxattr",
+                    [196] = "flistxattr",[197] = "removexattr",
+                    [198] = "lremovexattr",[199] = "fremovexattr",
+                    [200] = "tkill",[201] = "time",
+                    [202] = "futex",[203] = "sched_setaffinity",
+                    [204] = "sched_getaffinity",[205] = "set_thread_area",
+                    [206] = "io_setup",[207] = "io_destroy",
+                    [208] = "io_getevents",[209] = "io_submit",
+                    [210] = "io_cancel",[211] = "get_thread_area",
+                    [212] = "",[213] = "epoll_create",
+                    [214] = "",[215] = "",
+                    [216] = "remap_file_pages",[217] = "getdents64",
+                    [218] = "set_tid_address",[219] = "restart_syscall",
+                    [220] = "semtimedop",[221] = "fadvise64",
+                    [222] = "timer_create",[223] = "timer_settime",
+                    [224] = "timer_gettime",[225] = "timer_getoverrun",
+                    [226] = "timer_delete",[227] = "clock_settime",
+                    [228] = "clock_gettime",[229] = "clock_getres",
+                    [230] = "clock_nanosleep",[231] = "exit_group",
+                    [232] = "epoll_wait",[233] = "epoll_ctl",
+                    [234] = "tgkill",[235] = "utimes",
+                    [236] = "",[237] = "mbind",
+                    [238] = "set_mempolicy",[239] = "get_mempolicy",
+                    [240] = "mq_open",[241] = "mq_unlink",
+                    [242] = "mq_timedsend",[243] = "mq_timedreceive",
+                    [244] = "mq_notify",[245] = "mq_getsetattr",
+                    [246] = "kexec_load",[247] = "waitid",
+                    [248] = "add_key",[249] = "request_key",
+                    [250] = "keyctl",[251] = "ioprio_set",
+                    [252] = "ioprio_get",[253] = "inotify_init",
+                    [254] = "inotify_add_watch",[255] = "inotify_rm_watch",
+                    [256] = "migrate_pages",[257] = "openat",
+                    [258] = "mkdirat",[259] = "mknodat",
+                    [260] = "fchownat",[261] = "futimesat",
+                    [262] = "newfstatat",[263] = "unlinkat",
+                    [264] = "renameat",[265] = "linkat",
+                    [266] = "symlinkat",[267] = "readlinkat",
+                    [268] = "fchmodat",[269] = "faccessat",
+                    [270] = "pselect6",[271] = "ppoll",
+                    [272] = "unshare",[273] = "set_robust_list",
+                    [274] = "get_robust_list",[275] = "splice",
+                    [276] = "tee",[277] = "sync_file_range",
+                    [278] = "vmsplice",[279] = "move_pages",
+                    [280] = "utimensat",[281] = "epoll_pwait",
+                    [282] = "signalfd",[283] = "timerfd_create",
+                    [284] = "eventfd",[285] = "fallocate",
+                    [286] = "timerfd_settime",[287] = "timerfd_gettime",
+                    [288] = "accept4",[289] = "signalfd4",
+                    [290] = "eventfd2",[291] = "epoll_create1",
+                    [292] = "dup3",[293] = "pipe2",
+                    [294] = "inotify_init1",[295] = "preadv",
+                    [296] = "pwritev",[297] = "rt_tgsigqueueinfo",
+                    [298] = "perf_event_open",[299] = "recvmmsg",
+                    [300] = "fanotify_init",[301] = "fanotify_mark",
+                    [302] = "prlimit64",[303] = "name_to_handle_at",
+                    [304] = "open_by_handle_at",[305] = "clock_adjtime",
+                    [306] = "syncfs",[307] = "sendmmsg",
+                    [308] = "setns",[309] = "getcpu",
+                    [310] = "process_vm_readv",[311] = "process_vm_writev",
+                    [312] = "kcmp",[313] = "finit_module",
+                    [314] = "sched_setattr",[315] = "sched_getattr",
+                    [316] = "renameat2",[317] = "seccomp",
+                    [318] = "getrandom",[319] = "memfd_create",
+                    [320] = "kexec_file_load",[321] = "bpf",
+                    [322] = "execveat",[323] = "userfaultfd",
+                    [324] = "membarrier",[325] = "mlock2",
+                    [326] = "copy_file_range",[327] = "preadv2",
+                    [328] = "pwritev2",[329] = "pkey_mprotect",
+                    [330] = "pkey_alloc",[331] = "pkey_free",
+                    [332] = "statx",[333] = "io_pgetevents",
+                    [334] = "rseq",[335] = "",
+                    [336] = "",[337] = "",
+                    [338] = "",[339] = "",
+                    [340] = "",[341] = "",
+                    [342] = "",[343] = "",
+                    [344] = "",[345] = "",
+                    [346] = "",[347] = "",
+                    [348] = "",[349] = "",
+                    [350] = "",[351] = "",
+                    [352] = "",[353] = "",
+                    [354] = "",[355] = "",
+                    [356] = "",[357] = "",
+                    [358] = "",[359] = "",
+                    [360] = "",[361] = "",
+                    [362] = "",[363] = "",
+                    [364] = "",[365] = "",
+                    [366] = "",[367] = "",
+                    [368] = "",[369] = "",
+                    [370] = "",[371] = "",
+                    [372] = "",[373] = "",
+                    [374] = "",[375] = "",
+                    [376] = "",[377] = "",
+                    [378] = "",[379] = "",
+                    [380] = "",[381] = "",
+                    [382] = "",[383] = "",
+                    [384] = "",[385] = "",
+                    [386] = "",[387] = "",
+                    [388] = "",[389] = "",
+                    [390] = "",[391] = "",
+                    [392] = "",[393] = "",
+                    [394] = "",[395] = "",
+                    [396] = "",[397] = "",
+                    [398] = "",[399] = "",
+                    [400] = "",[401] = "",
+                    [402] = "",[403] = "",
+                    [404] = "",[405] = "",
+                    [406] = "",[407] = "",
+                    [408] = "",[409] = "",
+                    [410] = "",[411] = "",
+                    [412] = "",[413] = "",
+                    [414] = "",[415] = "",
+                    [416] = "",[417] = "",
+                    [418] = "",[419] = "",
+                    [420] = "",[421] = "",
+                    [422] = "",[423] = "",
+                    [424] = "pidfd_send_signal",[425] = "io_uring_setup",
+                    [426] = "io_uring_enter",[427] = "io_uring_register",
+                    [428] = "open_tree",[429] = "move_mount",
+                    [430] = "fsopen",[431] = "fsconfig",
+                    [432] = "fsmount",[433] = "fspick",
+                    [434] = "pidfd_open",[435] = "clone3" };
+}
+
+#endif
+/*
+
+Following command in part thx to:
+https://unix.stackexchange.com/questions/445507/syscall-number-%E2%86%92-name-mapping-at-runtime
+
+Command to create mapping of system call number to system call name:
+
+#!/bin/bash
+
+awk 'BEGIN { print "#include <sys/syscall.h>" }
+    /p_syscall_meta/ { syscall = substr($NF, 19);
+    printf "[SYS_%s] = \"%s\", \n", syscall, syscall }' /proc/kallsyms \
+| gcc -E -P - \
+| sort -V \
+| grep "\[[0-9]" \
+| awk 'BEGIN {expectedIndex = 0;}
+    { actualIndex = $1;
+        gsub(/[\[\]]/, "", actualIndex);
+        if (actualIndex != expectedIndex)
+            for (; expectedIndex < actualIndex; expectedIndex++)
+                print "[" expectedIndex "] = \"\",";
+        print $0; expectedIndex++ }' \
+| tr -d "\n" \
+| sed -e "s/^/const char *syscalls[1024] = {/; s/,$/ };/" \
+| sed -e 's/,/,\n                /2;P;D' \
+| cat - <(echo) # new line at the end
+*/
--- a/src/krikkel/Debug.hpp
+++ b/src/krikkel/Debug.hpp
@ -53,21 +53,14 @@ namespace krikkel
        {
 #define __debug_stringify_switch_case(caseTestValue) \
            case caseTestValue: \
-                propertyName = (propertyName.empty() ? #caseTestValue : propertyName); \
-                [[fallthrough]]
-#define __debug_stringify_switch_last_case_bool(caseTestValue, value) \
-            case caseTestValue: \
-                propertyName = (propertyName.empty() ? #caseTestValue : propertyName); \
+                propertyName = (propertyName.empty() ? #caseTestValue : propertyName)
+#define __debug_stringify_switch_case_end_bool(value) \
                valueString = (value ? "true" : "false"); \
                break
-#define __debug_stringify_switch_last_case_string(caseTestValue, value) \
-            case caseTestValue: \
-                propertyName = (propertyName.empty() ? #caseTestValue : propertyName); \
+#define __debug_stringify_switch_case_end_string(value) \
                valueString = "\"" + std::string(value) + "\""; \
                break
-#define __debug_stringify_switch_last_case_number(caseTestValue, value) \
-            case caseTestValue: \
-                propertyName = (propertyName.empty() ? #caseTestValue : propertyName); \
+#define __debug_stringify_switch_case_end_number(value) \
                valueString = std::to_string(value); \
                break;
 #define __debug_stringify_switch_end(__prop) \
@ -127,9 +120,9 @@ namespace krikkel
 #define __debug_log(message)
 #define __debug_stringify_switch_begin(closureName, __prop, __value)
 #define __debug_stringify_switch_case(caseTestValue)
-#define __debug_stringify_switch_last_case_bool(caseTestValue, value)
-#define __debug_stringify_switch_last_case_string(caseTestValue, value)
-#define __debug_stringify_switch_last_case_number(caseTestValue, value)
+#define __debug_stringify_switch_case_end_bool(value)
+#define __debug_stringify_switch_case_end_string(value)
+#define __debug_stringify_switch_case_end_number(value)
 #define __debug_stringify_switch_end(__prop)
 #define __debug_make_bytes_printable_table(__bytes)
 #define __debug_make_bytes_printable(__bytes)
--- a/README.md
+++ b/README.md
@ -3,8 +3,7 @@
 **WARNING**: This is a prototype. Things will probably break; in spectacular
 ways.

-`kNCurses` extends the existing C++ library shipping with ncurses and provides a
-tiling window manager and a pseudo terminal in a ncurses window.
+`NCursesPtyWindow` provides a pseudo terminal in a ncurses window.

 ## Building

--- a/src/krikkel/NCurses/SingleUserInput.cpp
+++ b/src/krikkel/NCurses/SingleUserInput.cpp
@ -2,8 +2,8 @@
 * @author Christian Burger (christian@krikkel.de)
 */

-#include "kNCurses/SingleUserInput.hpp"
-#include "../Debug.hpp"
+#include <NCursesPtyWindow/SingleUserInput.hpp>
+#include "Debug.hpp"

 #include <vterm.h>

@ -13,7 +13,7 @@
 #define KEY_ALT_BACKSPACE 127
 #define KEY_ALT_ALT_BACKSPACE '\b'

-namespace krikkel::NCurses
+namespace krikkel::NCursesPtyWindow
 {
    SingleUserInput::SingleUserInput(int _resultGetWchCall, wint_t _input)
        : input(_input), resultGetWchCall(_resultGetWchCall)
@ -42,7 +42,7 @@ namespace krikkel::NCurses
        // it is only processing user input, it is not time critical enough for
        // the wasted space

-        // @todo unmapped keys: keys erase
+        // @tode unmapped keys: keys erase
        if(resultGetWchCall == OK)
            switch(input)
            {
--- a/Window.cpp
+++ b/Window.cpp
@ -0,0 +1,345 @@
+/**
+ * @author Christian Burger (christian@krikkel.de)
+ */
+
+#include <NCursesPtyWindow/Window.hpp>
+#include "Debug.hpp"
+
+#include <cstdio>
+#include <unistd.h>
+#include <sys/select.h>
+#include <gsl/gsl>
+#include <cctype>
+#include <termios.h>
+#include <fcntl.h>
+
+namespace krikkel::NCursesPtyWindow
+{
+    using gsl::narrow;
+    using std::lock_guard;
+
+    Window::Window(std::mutex *writeToNCursesMutex, int lines, int columns, int y, int x)
+            : writeToNCursesMutex(writeToNCursesMutex), NCursesWindow(lines, columns, y, x)
+    {
+        // to get the original terminal we need to shutdown ncurses for a moment
+        /// @todo maybe try `reset_prog_mode()` and `reset_shell_mode()` instead
+        ::endwin();
+        tcgetattr(STDIN_FILENO, &terminalParameters);
+        ::refresh();
+
+        winsize windowSize =
+        {
+            .ws_row = narrow<short unsigned int>(this->height())
+          , .ws_col = narrow<short unsigned int>(this->width())
+        };
+        openpty(&fdPtyHost, &fdPtyClient, NULL, &terminalParameters, &windowSize);
+
+        pseudoTerminal = vterm_new(windowSize.ws_row, windowSize.ws_col);
+        vterm_set_utf8(pseudoTerminal, true);
+        pseudoTerminalScreen = vterm_obtain_screen(pseudoTerminal);
+        vterm_screen_reset(pseudoTerminalScreen, true);
+        vterm_screen_set_callbacks(pseudoTerminalScreen, &screenCallbacks, this);
+        vterm_output_set_callback(pseudoTerminal, &staticHandlerOutput, this);
+        vterm_screen_enable_altscreen(pseudoTerminalScreen, true);
+
+        //raw(); //— cbreak might suffice
+        //noecho(); — already set
+        //nodelay(true); — @todo needs some reprogramming
+        keypad(true);
+        nonl();
+
+        /// @todo block all signals, this thread does not handle any
+        readPtyClientThread =
+            std::thread(&Window::readFromPtyClientThreadMethod, this);
+    }
+
+    Window::~Window()
+    {
+        close(fdPtyHost);
+        close(fdPtyClient);
+        vterm_free(pseudoTerminal);
+    }
+
+    int Window::getFdPtyClient() const
+    {
+        return fdPtyClient;
+    }
+
+    void Window::writeToClient(const char *output, size_t length)
+    {
+        lock_guard writeLock(writeToPseudoTerminalMutex);
+        write(fdPtyHost, output, length);
+        __debug_log("written to PTY client: '" + __debug_make_bytes_printable(std::string(output, length)) + '\'');
+    }
+
+    void Window::writeUnicodeCharToClient(wint_t character)
+    {
+        vterm_keyboard_unichar(pseudoTerminal, character, VTERM_MOD_NONE);
+    }
+
+    void Window::writeKeyToClient(VTermKey key)
+    {
+        __debug_log("writing key: " + std::to_string(key));
+        vterm_keyboard_key(pseudoTerminal, key, VTERM_MOD_NONE);
+    }
+
+    SingleUserInput Window::readSingleUserInput()
+    {
+        wint_t input;
+        int result = get_wch(&input);
+        return SingleUserInput(result, input);
+    }
+
+    void Window::readFromPtyClientThreadMethod()
+    {
+        /// @todo in theory, there is no need for a timeout or select …
+        ///       file descriptor is blocking
+        while(1)
+        {
+            readFromPtyClient();
+            struct timeval timeout = { .tv_sec = 0, .tv_usec = 200000 };
+            fd_set readFds;
+
+            FD_ZERO(&readFds);
+            FD_SET(fdPtyHost, &readFds);
+            if(select(fdPtyHost + 1, &readFds, NULL, NULL, &timeout) < 0)
+                break;
+        }
+    }
+
+    void Window::readFromPtyClient()
+    {
+        size_t bytesRead = read(fdPtyHost, ptyClientOutputBuffer, PTY_CLIENT_OUTPUT_BUFFER_SIZE);
+        if(bytesRead != -1 && bytesRead != 0)
+        {
+            lock_guard writeLock(writeToPseudoTerminalMutex);
+            vterm_input_write(pseudoTerminal, ptyClientOutputBuffer, bytesRead);
+        }
+        __debug_log("read from PTY client: '" + __debug_make_bytes_printable(std::string(ptyClientOutputBuffer, bytesRead)) + '\'');
+    }
+
+    VTermScreenCallbacks Window::screenCallbacks =
+    {
+        .damage = staticHandlerDamage,
+        .moverect = staticHandlerMoveRect,
+        .movecursor = staticHandlerMoveCursor,
+        .settermprop = staticHandlerSetTermProp,
+        .bell = staticHandlerBell,
+        .resize = staticHandlerResize,
+        .sb_pushline = staticHandlerPushLine,
+        .sb_popline = staticHandlerPopLine,
+    };
+
+    int Window::handlerDamage(VTermRect rect)
+    {
+        for(int x = rect.start_col; x < rect.end_col; ++x)
+            for(int y = rect.start_row; y < rect.end_row; ++y)
+                copyPtyCellToNCursesWindow(x, y);
+
+        refresh();
+
+        return 0;
+    }
+
+    int Window::handlerMoveRect(VTermRect dest, VTermRect src)
+    {
+        __debug_log("(unimplemented) move content in rectangle from ("
+              + std::to_string(src.start_col) + ", "
+              + std::to_string(src.start_row) + ", "
+              + std::to_string(src.end_col) + ", "
+              + std::to_string(src.end_row) + ") "
+              + "size: " + std::to_string((src.start_col - src.end_col) * (src.start_row - src.end_row))
+              + " to ("
+              + std::to_string(dest.start_col) + ", "
+              + std::to_string(dest.start_row) + ", "
+              + std::to_string(dest.end_col) + ", "
+              + std::to_string(dest.end_row) + ") "
+              + "size: " + std::to_string((dest.start_col - dest.end_col) * (dest.start_row - dest.end_row)));
+        return 0;
+    }
+
+    int Window::handlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible)
+    {
+        /// @todo maybe use `mvcur()` instead?
+        cursorX = pos.col;
+        cursorY = pos.row;
+        refresh();
+        return 0;
+    }
+
+    int Window::handlerSetTermProp(VTermProp prop, VTermValue *val)
+    {
+        /// @todo maybe use "vterm_get_prop_type() —> bool, number, string"?
+        __debug_stringify_switch_begin(handlerSetTermProp, prop, val);
+            __debug_stringify_switch_case(VTERM_PROP_CURSORVISIBLE);
+            __debug_stringify_switch_case(VTERM_PROP_CURSORBLINK);
+            __debug_stringify_switch_case(VTERM_PROP_ALTSCREEN);
+            __debug_stringify_switch_case(VTERM_PROP_REVERSE);
+                __debug_stringify_switch_case_end_bool(val->boolean);
+            __debug_stringify_switch_case(VTERM_PROP_TITLE);
+            __debug_stringify_switch_case(VTERM_PROP_ICONNAME);
+                __debug_stringify_switch_case_end_string(val->string);
+            __debug_stringify_switch_case(VTERM_PROP_CURSORSHAPE);
+            __debug_stringify_switch_case(VTERM_PROP_MOUSE);
+                __debug_stringify_switch_case_end_number(val->number);
+        __debug_stringify_switch_end(prop);
+
+        __debug_log(std::string("unimplemented handler called: ")
+                  + __debug_stringify_get_string(handlerSetTermProp)
+                   );
+        return 0;
+    }
+
+    int Window::handlerBell()
+    {
+        beep();
+        return 0;
+    }
+
+    int Window::handlerResize(int rows, int cols)
+    {
+        __debug_log("unimplemented handler called");
+        return 0;
+    }
+
+    int Window::handlerPushLine(int cols, const VTermScreenCell *cells)
+    {
+        __debug_log("(unimplemented) push line with " + std::to_string(cols) + " columns");
+        return 0;
+    }
+
+    int Window::handlerPopLine(int cols, VTermScreenCell *cells)
+    {
+        __debug_log("unimplemented handler called");
+        return 0;
+    }
+
+    attr_t Window::extractAttributesFromVTermCell(VTermScreenCell vTermCell)
+    {
+        attr_t result = A_NORMAL;
+        //__debug_log("unimplemented method called");
+        return result;
+    }
+
+    short Window::extractColorFromVTermCell(VTermScreenCell vTermCell)
+    {
+        //__debug_log("unimplemented method called");
+        return 0;
+    }
+
+    void Window::copyPtyCellToNCursesWindow(int x, int y)
+    {
+        VTermPos cellPosition = {y, x};
+        VTermScreenCell vTermCell;
+        cchar_t converted;
+        attr_t formatting;
+        short colorPair;
+        wchar_t character;
+
+        vterm_screen_get_cell(pseudoTerminalScreen, cellPosition, &vTermCell);
+        formatting = extractAttributesFromVTermCell(vTermCell);
+        colorPair = extractColorFromVTermCell(vTermCell);
+
+        if(vTermCell.chars[0] == 0)
+            character = ' ';
+        else
+            character = *vTermCell.chars;
+
+        {
+            lock_guard nCursesLock(*writeToNCursesMutex);
+            setcchar(&converted, &character, formatting, colorPair, NULL);
+            move(cellPosition.row, cellPosition.col);
+            chgat(1, formatting, colorPair, NULL);
+            add_wch(&converted);
+        }
+    }
+
+    int Window::add_wch(const cchar_t *character)
+    {
+        return ::wadd_wch(w, character);
+    }
+
+    int Window::get_wch(wint_t *character)
+    {
+        return ::wget_wch(w, character);
+    }
+
+    int Window::refresh()
+    {
+        lock_guard nCursesLock(*writeToNCursesMutex);
+        move(cursorY, cursorX);
+        return NCursesWindow::refresh();
+    }
+
+    /// @todo potential racing condition where drawing into terminal while
+    ///       resizing?
+    int Window::wresize(int rows, int cols)
+    {
+        lock_guard nCursesLock(*writeToNCursesMutex);
+        lock_guard writeLock(writeToPseudoTerminalMutex);
+        winsize windowSize =
+        {
+            .ws_row = narrow<unsigned short>(rows)
+          , .ws_col = narrow<unsigned short>(cols)
+        };
+        ioctl(fdPtyHost, TIOCSWINSZ, &windowSize);
+      	vterm_set_size(pseudoTerminal, rows, cols);
+
+        return  NCursesWindow::wresize(rows, cols);
+    }
+
+    int Window::staticHandlerDamage(VTermRect rect, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerDamage(rect);
+    }
+
+    int Window::staticHandlerMoveRect(VTermRect dest, VTermRect src, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerMoveRect(dest, src);
+    }
+
+    int Window::staticHandlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerMoveCursor(pos, oldpos, visible);
+    }
+
+    int Window::staticHandlerSetTermProp(VTermProp prop, VTermValue *val, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerSetTermProp(prop, val);
+    }
+
+    int Window::staticHandlerBell(void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerBell();
+    }
+
+    int Window::staticHandlerResize(int rows, int cols, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerResize(rows, cols);
+    }
+
+    int Window::staticHandlerPushLine(int cols, const VTermScreenCell *cells, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerPushLine(cols, cells);
+    }
+
+    int Window::staticHandlerPopLine(int cols, VTermScreenCell *cells, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        return instance->handlerPopLine(cols, cells);
+    }
+
+    void Window::staticHandlerOutput(const char *s, size_t len, void *user)
+    {
+        Window *instance = static_cast<Window *>(user);
+        __debug_log("output handler writing to client: '" + __debug_make_bytes_printable(std::string(s, len)) + "'");
+        instance->writeToClient(s, len);
+   }
+}
--- a/default.nix
+++ b/default.nix
@ -1,18 +0,0 @@
-{ debug ? false }:
-
-with import <nixpkgs> { };
-
-let
-  ncursesPkg = ncurses.overrideAttrs (oldAttrs: rec { configureFlags = oldAttrs.configureFlags ++ [ "--with-cxx-shared" ];});
-in
-stdenv.mkDerivation {
-  name = "kNCurses";
-  src = ./.;
-
-  buildInputs = [ libvterm-neovim ncursesPkg microsoft_gsl];
-  nativeBuildInputs = [ cmake ];
-  cmakeBuildType = if debug then "Debug" else "Release";
-  makeFlags = lib.lists.optional debug "VERBOSE=1";
-  hardeningDisable = lib.lists.optionals debug [ "fortify" ];
-  dontStrip = debug;
-}
--- a/include/NCursesPtyWindow/SingleUserInput.hpp
+++ b/include/NCursesPtyWindow/SingleUserInput.hpp
@ -9,7 +9,7 @@
 #include <cursesw.h>
 #include <vterm_keycodes.h>

-namespace krikkel::NCurses
+namespace krikkel::NCursesPtyWindow
 {
    class SingleUserInput
    {
--- a/include/NCursesPtyWindow/Window.hpp
+++ b/include/NCursesPtyWindow/Window.hpp
@ -1,13 +1,12 @@
 /**
 * @brief `ncurses` window displaying contents of a pseudo terminal
 * @author Christian Burger (christian@krikkel.de)
- * @todo remove all invalid constructors
 */

 #ifndef __WINDOW_H__
 #define __WINDOW_H__

-#include "Window.hpp"
+#include "SingleUserInput.hpp"

 #include <cursesw.h>
 #include <pty.h>
@ -16,27 +15,44 @@
 #include <thread>
 #include <mutex>

-namespace krikkel::NCurses
+#ifdef add_wch
+inline void UNDEF(add_wch)(const cchar_t *character) { add_wch(character); }
+#undef add_wch
+#define add_wch UNDEF(add_wch)
+#endif
+
+#ifdef get_wch
+inline void UNDEF(get_wch)(wint_t *character) { get_wch(character); }
+#undef get_wch
+#define get_wch UNDEF(get_wch)
+#endif
+
+namespace krikkel::NCursesPtyWindow
 {
-    class PtyWindow : public Window
+    class Window : public NCursesWindow
    {
        public:
-            PtyWindow(std::recursive_mutex *ncursesMutex, int lines, int columns, int y, int x);
-            ~PtyWindow();
+            Window(std::mutex *writeToNCursesMutex, int lines, int columns, int y, int x);
+            ~Window();

            int getFdPtyClient() const;
+            void writeToClient(const char * string, size_t length);
            void writeUnicodeCharToClient(wint_t character);
-            void writeFunctionKeyToClient(VTermKey key);
+            void writeKeyToClient(VTermKey key);

+            SingleUserInput readSingleUserInput();
+
+            int add_wch(const cchar_t *character);
+            int get_wch(wint_t *character);
            int refresh() override;
-            int resize(int rows, int cols) override;
+            int wresize(int rows, int cols);

        private:
            int fdPtyHost, fdPtyClient;
            struct termios terminalParameters;
            VTerm *pseudoTerminal;
-            std::recursive_mutex ptyMutex;
-            std::recursive_mutex *ncursesMutex;
+            std::mutex writeToPseudoTerminalMutex;
+            std::mutex *writeToNCursesMutex;
            VTermScreen *pseudoTerminalScreen;
            static VTermScreenCallbacks screenCallbacks;
            /// @todo one line is at most 4096 chars long
@ -47,7 +63,6 @@ namespace krikkel::NCurses
            std::thread readPtyClientThread;
            void readFromPtyClientThreadMethod();
            void readFromPtyClient();
-            void writeToPtyClient(const char * string, size_t length);

            int handlerDamage(VTermRect rect);
            int handlerMoveRect(VTermRect dest, VTermRect src);
--- a/include/kNCurses/HorizontalTilingWindowManager.hpp
+++ b/include/kNCurses/HorizontalTilingWindowManager.hpp
@ -1,31 +0,0 @@
-/**
- * @brief Window manager
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#ifndef B7BCF793_2FAB_49CC_9E00_CDEA370D38F9
-#define B7BCF793_2FAB_49CC_9E00_CDEA370D38F9
-
-#include "TilingWindowManager.hpp"
-
-namespace krikkel::NCurses
-{
-    class Window;
-    class SingleUserInput;
-
-    class HorizontalTilingWindowManager : public TilingWindowManager
-    {
-        public:
-            HorizontalTilingWindowManager(NCursesWindow *rootWindow, std::recursive_mutex *ncursesMutex);
-
-            void resizeAndMoveWindow(Window *window
-                                   , windowDimension dimension
-                                   , windowPosition position) override;
-            windowDimension getAvailableSpace() override;
-            void windowBorder() override;
-            void moveCursor(windowPosition position) override;
-    };
-}
-
-
-#endif /* B7BCF793_2FAB_49CC_9E00_CDEA370D38F9 */
--- a/include/kNCurses/README.md
+++ b/include/kNCurses/README.md
@ -1,4 +0,0 @@
-## Rational
-
-The include files are part of the exposed part of the library. Thus they are
-kept separate from the actual source.
--- a/include/kNCurses/TilingWindowManager.hpp
+++ b/include/kNCurses/TilingWindowManager.hpp
@ -1,65 +0,0 @@
-/**
- * @brief Window manager for tiling (template pattern, abstract parent)
- *
- * A window manager contains windows of a given size, lays them out and can hide
- * or show them. There is no concrete window manager for tiling horizontally and
- * vertically at the same time. Instead nesting the window managers is adviced,
- * since the window manager classes are derived from windows in the end.
- *
- * This is an abstract class used by the concrete classes
- * `VerticalTilingWindowManager` and `HorizontalTilingWindowManager`. Both
- * specify the virtual and protected, declared but undefined methods used by the
- * public interface to facilitate the function depending on the orientation
- * (horizontally or vertically).
- *
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#ifndef C51BA18F_0915_43B9_BD5D_129F0CDBC1CD
-#define C51BA18F_0915_43B9_BD5D_129F0CDBC1CD
-
-#include "Window.hpp"
-#include <list>
-#include <mutex>
-#include <utility>
-
-namespace krikkel::NCurses
-{
-    class SingleUserInput;
-
-    class TilingWindowManager : public Window
-    {
-        public:
-            /// @todo figure out more appropiate names …
-            typedef int16_t windowDimension;
-            typedef uint16_t windowPosition;
-            typedef std::pair<Window *, windowDimension> WindowStackElement;
-
-            TilingWindowManager(NCursesWindow *rootWindow, std::recursive_mutex *ncursesMutex);
-            std::recursive_mutex *getNCursesMutex();
-            void addWindow(Window *window, windowDimension size = -1);
-
-            int resize(int rows, int cols) override;
-            int refresh() override;
-            void updateLayout();
-
-            void hideWindow(Window *window);
-            void showWindow(Window *window);
-            void invertWindowsVisibility();
-
-        protected:
-            /// @todo rename to `nCursesMutex`?
-            std::recursive_mutex *ncursesMutex;
-            std::list<WindowStackElement> stack, visibleStack;
-
-            windowDimension getRelativeUnitSizeForVisibleWindows(windowDimension spaceAvailable);
-            virtual void resizeAndMoveWindow(Window *window
-                                   , windowDimension dimension
-                                   , windowPosition position) = 0;
-            virtual void windowBorder() = 0;
-            virtual windowDimension getAvailableSpace() = 0;
-            virtual void moveCursor(windowPosition position) = 0;
-    };
-}
-
-#endif /* C51BA18F_0915_43B9_BD5D_129F0CDBC1CD */
--- a/include/kNCurses/VerticalTilingWindowManager.hpp
+++ b/include/kNCurses/VerticalTilingWindowManager.hpp
@ -1,31 +0,0 @@
-/**
- * @brief Window manager
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#ifndef C10F5DF3_1DB4_4714_A84D_115F492F5CDC
-#define C10F5DF3_1DB4_4714_A84D_115F492F5CDC
-
-#include "TilingWindowManager.hpp"
-
-namespace krikkel::NCurses
-{
-    class Window;
-    class SingleUserInput;
-
-    class VerticalTilingWindowManager : public TilingWindowManager
-    {
-        public:
-            VerticalTilingWindowManager(NCursesWindow *rootWindow, std::recursive_mutex *ncursesMutex);
-
-            void resizeAndMoveWindow(Window *window
-                                   , windowDimension dimension
-                                   , windowPosition position) override;
-            windowDimension getAvailableSpace() override;
-            void windowBorder() override;
-            void moveCursor(windowPosition position) override;
-    };
-}
-
-
-#endif /* C10F5DF3_1DB4_4714_A84D_115F492F5CDC */
--- a/include/kNCurses/Window.hpp
+++ b/include/kNCurses/Window.hpp
@ -1,65 +0,0 @@
-/**
- * @brief Providing wide character methods missing in NCursesWindow.
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#ifndef A2C3FDB7_7A85_4527_BC85_366E14149EB8
-#define A2C3FDB7_7A85_4527_BC85_366E14149EB8
-
-#include "SingleUserInput.hpp"
-
-#include <ncursesw/cursesw.h>
-
-#ifdef addnwstr
-inline int UNDEF(addnwstr)(const wchar_t *wstr, int n) { return addnwstr(wstr, n); }
-#undef addnwstr
-#define addnwstr UNDEF(addnwstr)
-#endif
-
-#ifdef add_wch
-inline int UNDEF(add_wch)(const cchar_t *character) { return add_wch(character); }
-#undef add_wch
-#define add_wch UNDEF(add_wch)
-#endif
-
-#ifdef ins_wch
-inline int UNDEF(ins_wch)(cchar_t *character) { return ins_wch(character); }
-#undef ins_wch
-#define ins_wch UNDEF(ins_wch)
-#endif
-
-#ifdef get_wch
-inline int UNDEF(get_wch)(wint_t *character) { return get_wch(character); }
-#undef get_wch
-#define get_wch UNDEF(get_wch)
-#endif
-
-namespace krikkel::NCurses
-{
-    class TilingWindowManager;
-
-    class Window : public NCursesWindow
-    {
-        friend class TilingWindowManager;
-
-        public:
-            Window();
-            Window(TilingWindowManager *windowManager);
-            Window(const NCursesWindow &window);
-            Window(int lines, int columns, int y, int x);
-            int addnwstr(const wchar_t *wstr, int n);
-            int add_wch(const cchar_t *character);
-            int ins_wch(const cchar_t *character);
-            int get_wch(wint_t *character);
-
-            bool isHidden();
-            SingleUserInput readSingleUserInput();
-            virtual int resize(int rows, int cols);
-            virtual int refresh() override;
-
-        protected:
-            bool hidden = false;
-    };
-}
-
-#endif /* A2C3FDB7_7A85_4527_BC85_366E14149EB8 */
--- a/src/krikkel/NCurses/main.cpp
+++ b/src/krikkel/NCurses/main.cpp
@ -4,6 +4,6 @@
 * @author Christian Burger (christian@krikkel.de)
 */

-#include "DemoApp.hpp"
+#include "App.hpp"

-krikkel::NCurses::DemoApp demoApp;
+krikkel::NCursesPtyWindow::App cursesPtyApp;
--- a/src/krikkel/Debug.cpp
+++ b/src/krikkel/Debug.cpp
@ -1,506 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- * @todo Switch over to <seccomp.h>? For resolving system call numbers?
- *       Maybe keep the current solution as a fallback?
- * @todo catch `out of range` exception from stoi()
- *
- * Contains mapping of system calls numbers to names from original dev system:
- *      "Linux 5.13.0-28-generic #31~20.04.1-Ubuntu SMP \
- *       Wed Jan 19 14:08:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux"
- * See comment at the end for the actual command to gather mapping information.
- */
-
-#ifndef NDEBUG
-
-#include "Debug.hpp"
-
-#include <algorithm>
-#include <cstring>
-#include <filesystem>
-#include <cstdio>
-#include <syscall.h>
-#include <sys/ptrace.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#define BUFFER_SIZE 128
-
-namespace krikkel
-{
-    using std::string;
-    using std::fstream;
-    using std::filesystem::is_directory;
-    using std::endl;
-    using std::time;
-    using std::localtime;
-    using std::strftime;
-    using std::min;
-
-    Debug::Debug()
-    {
-        string directory = ".";
-        if(is_directory("sandbox"))
-            directory = "./sandbox";
-        logFile = fstream(directory + "/debug.log", fstream::out | fstream::app);//| fstream::trunc);
-        logFile << endl << endl << endl << endl << "New instance of class Debug." << endl;
-        logFile << getUname();
-        logFile.flush();
-    }
-
-    string Debug::getUname()
-    {
-        string result = "";
-        char buffer[BUFFER_SIZE];
-        FILE *unameProcess = popen("uname -srvmpio", "r");
-
-        if(unameProcess && fgets(buffer, BUFFER_SIZE, unameProcess))
-            result = buffer;
-        pclose(unameProcess);
-
-        return result;
-    }
-
-    string Debug::getTimestamp()
-    {
-        time_t now = time(NULL);
-        tm *localNow = localtime(&now);
-        static char formattedLocalNow[32];
-        strftime(formattedLocalNow, 32, "%c", localNow);
-
-        return formattedLocalNow;
-    }
-
-    void Debug::log(string message, string fileName, int lineNo, string functionName)
-    {
-        string output = "";
-        size_t position = message.find("sysCall(");
-
-        if(position != string::npos)
-        {
-            size_t end = message.find_first_not_of("0123456789", position + 8);
-            unsigned long long systemCallNumber = std::stoi(message.substr(position + 8, end - position - 8));
-            string systemCallName = strlen(syscalls[systemCallNumber]) != 0 ? syscalls[systemCallNumber]
-                                                                     : "unknown_system_call";
-            if(systemCallNumber < MAX_NUMBER_OF_SYSCALLS)
-                output = message.replace(position, end - position + 1, systemCallName + "(");
-        }
-        if(output == "")
-            output = message;
-
-        logFile << getTimestamp() << ": " << output << " (in "
-                << fileName.substr(fileName.rfind('/') + 1) << ":"
-                << lineNo << " in " << functionName << "())" << endl;
-        logFile.flush();
-    }
-
-    std::string Debug::peekData(pid_t shellPid, void *data, size_t length)
-    {
-        std::string result;
-
-        for(size_t index = 0; index < length / sizeof(long); ++index)
-        {
-            long datum = ptrace(PTRACE_PEEKDATA, shellPid, ((char *) data) + index * sizeof(long));
-            if(length == static_cast<size_t>(-1))
-            {
-                size_t datumLength = strnlen((char *) &datum, sizeof(long));
-                result += string((char *) &datum, datumLength);
-                if(datumLength < sizeof(long))
-                    break;
-            }
-            else
-                result += string((char *) &datum, sizeof(long));
-        }
-
-        return result;
-    }
-
-    std::string Debug::formatToAddress(unsigned long long address)
-    {
-        char addressString[17];
-
-        snprintf(addressString, 17, "%016llx", address);
-
-        return string("0x") + addressString;
-    }
-
-    void Debug::logPtraceSysCall(pid_t shellPid, uint16_t sysCallId, bool returnedFromSysCall, unsigned long long result, unsigned long long firstArgument, unsigned long long secondArgument, unsigned long long thirdArgument, unsigned long long fourthArgument, std::string fileName, int lineNo, std::string functionName)
-    {
-        const static uint8_t maxStringLength = 32;
-        string message = "syscall: ";
-
-        string sysCallName;
-        if(sysCallId < MAX_NUMBER_OF_SYSCALLS)
-            sysCallName = syscalls[sysCallId];
-        if(sysCallName.empty())
-            sysCallName = "syscall" + std::to_string(sysCallId);
-
-
-        // good overviews for syscall arguments:
-        // https://filippo.io/linux-syscall-table/
-        // https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
-        switch(sysCallId)
-        {
-            case SYS_read:
-                if(returnedFromSysCall)
-                    message += (result == static_cast<unsigned long long>(-1) ? "-1" : std::to_string((size_t) result)) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", \"" + (returnedFromSysCall ? __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength))) : "")
-                        + (maxStringLength < thirdArgument || returnedFromSysCall == true ? "[…]" : "") + "\""
-                        + ", " + std::to_string((size_t) thirdArgument)
-                        + ")";
-                break;
-            case SYS_write:
-                if(returnedFromSysCall)
-                    message += (result == static_cast<unsigned long long>(-1) ? "-1" : std::to_string((size_t) result)) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength)))
-                        + (maxStringLength < thirdArgument || returnedFromSysCall == true ? "[…]" : "") + "\""
-                        + ", " + std::to_string((size_t) thirdArgument)
-                        + ")";
-                break;
-            case SYS_close:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ")";
-                break;
-            case SYS_stat:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(\"" + peekData(shellPid, (char *) firstArgument, -1) + "\""
-                        + ", " + formatToAddress(secondArgument)
-                        + ")";
-                break;
-            case SYS_fstat:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", " + formatToAddress(secondArgument)
-                        + ")";
-                break;
-            case SYS_openat:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + ((int) firstArgument == AT_FDCWD ? string("AT_FDCWD") : std::to_string((int) firstArgument))
-                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, -1)) + "\""
-                        + ", " + std::to_string((int) thirdArgument)
-                        + ")";
-                break;
-            case SYS_rt_sigprocmask:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", " + formatToAddress(secondArgument)
-                        + ", " + formatToAddress(thirdArgument)
-                        + ", " + std::to_string((size_t) fourthArgument)
-                        + ")";
-                break;
-            case SYS_access:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + peekData(shellPid, (char *) firstArgument, -1)
-                        + ", " + std::to_string((int) secondArgument)
-                        + ")";
-                break;
-            case SYS_dup2:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", " + std::to_string((int) secondArgument)
-                        + ")";
-                break;
-            case SYS_fcntl:
-                if(returnedFromSysCall)
-                    message += std::to_string((int) result) + " = ";
-                message += sysCallName
-                        + "(" + std::to_string((int) firstArgument)
-                        + ", " + (secondArgument == 0 ? string("F_DUP_FD") :  std::to_string((int) secondArgument))
-                        + ", …"
-                        + ")";
-                break;
-/*            case SYS_fstat:
-                struct stat statbuf;
-                message += "(" + std::to_string(firstArgument)
-                        + ", \"" + __debug_make_bytes_printable(peekData(shellPid, (char *) secondArgument, (size_t) min<unsigned long long>(thirdArgument, maxStringLength)))
-                        + (maxStringLength < thirdArgument ? "[…]" : "") + "\""
-                        + ", " + std::to_string((size_t) thirdArgument)
-                        + ")";
-                break;
-*/            default:
-                if(returnedFromSysCall)
-                    message += (result == (unsigned long long) -1 ? "-1" : std::to_string(result)) + " = ";
-                message += sysCallName
-                        + "(" + formatToAddress(firstArgument)
-                        + ", " + formatToAddress(secondArgument)
-                        + ", " + formatToAddress(thirdArgument)
-                        + ", " + formatToAddress(fourthArgument)
-                        + ")";
-        }
-        // source: https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
-
-        log(message, fileName, lineNo, functionName);
-    }
-
-    Debug *Debug::getInstance()
-    {
-        static Debug *debug = new Debug();
-        return debug;
-    }
-
-    const char *Debug::syscalls[MAX_NUMBER_OF_SYSCALLS] = {/*[0] =*/ "read",/*[1] =*/ "write",
-                    /*[2] =*/ "open",/*[3] =*/ "close",
-                    /*[4] =*/ "stat",/*[5] =*/ "fstat",
-                    /*[6] =*/ "lstat",/*[7] =*/ "poll",
-                    /*[8] =*/ "lseek",/*[9] =*/ "mmap",
-                    /*[10] =*/ "mprotect",/*[11] =*/ "munmap",
-                    /*[12] =*/ "brk",/*[13] =*/ "rt_sigaction",
-                    /*[14] =*/ "rt_sigprocmask",/*[15] =*/ "rt_sigreturn",
-                    /*[16] =*/ "ioctl",/*[17] =*/ "pread64",
-                    /*[18] =*/ "pwrite64",/*[19] =*/ "readv",
-                    /*[20] =*/ "writev",/*[21] =*/ "access",
-                    /*[22] =*/ "pipe",/*[23] =*/ "select",
-                    /*[24] =*/ "sched_yield",/*[25] =*/ "mremap",
-                    /*[26] =*/ "msync",/*[27] =*/ "mincore",
-                    /*[28] =*/ "madvise",/*[29] =*/ "shmget",
-                    /*[30] =*/ "shmat",/*[31] =*/ "shmctl",
-                    /*[32] =*/ "dup",/*[33] =*/ "dup2",
-                    /*[34] =*/ "pause",/*[35] =*/ "nanosleep",
-                    /*[36] =*/ "getitimer",/*[37] =*/ "alarm",
-                    /*[38] =*/ "setitimer",/*[39] =*/ "getpid",
-                    /*[40] =*/ "sendfile",/*[41] =*/ "socket",
-                    /*[42] =*/ "connect",/*[43] =*/ "accept",
-                    /*[44] =*/ "sendto",/*[45] =*/ "recvfrom",
-                    /*[46] =*/ "sendmsg",/*[47] =*/ "recvmsg",
-                    /*[48] =*/ "shutdown",/*[49] =*/ "bind",
-                    /*[50] =*/ "listen",/*[51] =*/ "getsockname",
-                    /*[52] =*/ "getpeername",/*[53] =*/ "socketpair",
-                    /*[54] =*/ "setsockopt",/*[55] =*/ "getsockopt",
-                    /*[56] =*/ "clone",/*[57] =*/ "fork",
-                    /*[58] =*/ "vfork",/*[59] =*/ "execve",
-                    /*[60] =*/ "exit",/*[61] =*/ "wait4",
-                    /*[62] =*/ "kill",/*[63] =*/ "uname",
-                    /*[64] =*/ "semget",/*[65] =*/ "semop",
-                    /*[66] =*/ "semctl",/*[67] =*/ "shmdt",
-                    /*[68] =*/ "msgget",/*[69] =*/ "msgsnd",
-                    /*[70] =*/ "msgrcv",/*[71] =*/ "msgctl",
-                    /*[72] =*/ "fcntl",/*[73] =*/ "flock",
-                    /*[74] =*/ "fsync",/*[75] =*/ "fdatasync",
-                    /*[76] =*/ "truncate",/*[77] =*/ "ftruncate",
-                    /*[78] =*/ "getdents",/*[79] =*/ "getcwd",
-                    /*[80] =*/ "chdir",/*[81] =*/ "fchdir",
-                    /*[82] =*/ "rename",/*[83] =*/ "mkdir",
-                    /*[84] =*/ "rmdir",/*[85] =*/ "creat",
-                    /*[86] =*/ "link",/*[87] =*/ "unlink",
-                    /*[88] =*/ "symlink",/*[89] =*/ "readlink",
-                    /*[90] =*/ "chmod",/*[91] =*/ "fchmod",
-                    /*[92] =*/ "chown",/*[93] =*/ "fchown",
-                    /*[94] =*/ "lchown",/*[95] =*/ "umask",
-                    /*[96] =*/ "gettimeofday",/*[97] =*/ "getrlimit",
-                    /*[98] =*/ "getrusage",/*[99] =*/ "sysinfo",
-                    /*[100] =*/ "times",/*[101] =*/ "ptrace",
-                    /*[102] =*/ "getuid",/*[103] =*/ "syslog",
-                    /*[104] =*/ "getgid",/*[105] =*/ "setuid",
-                    /*[106] =*/ "setgid",/*[107] =*/ "geteuid",
-                    /*[108] =*/ "getegid",/*[109] =*/ "setpgid",
-                    /*[110] =*/ "getppid",/*[111] =*/ "getpgrp",
-                    /*[112] =*/ "setsid",/*[113] =*/ "setreuid",
-                    /*[114] =*/ "setregid",/*[115] =*/ "getgroups",
-                    /*[116] =*/ "setgroups",/*[117] =*/ "setresuid",
-                    /*[118] =*/ "getresuid",/*[119] =*/ "setresgid",
-                    /*[120] =*/ "getresgid",/*[121] =*/ "getpgid",
-                    /*[122] =*/ "setfsuid",/*[123] =*/ "setfsgid",
-                    /*[124] =*/ "getsid",/*[125] =*/ "capget",
-                    /*[126] =*/ "capset",/*[127] =*/ "rt_sigpending",
-                    /*[128] =*/ "rt_sigtimedwait",/*[129] =*/ "rt_sigqueueinfo",
-                    /*[130] =*/ "rt_sigsuspend",/*[131] =*/ "sigaltstack",
-                    /*[132] =*/ "utime",/*[133] =*/ "mknod",
-                    /*[134] =*/ "uselib",/*[135] =*/ "personality",
-                    /*[136] =*/ "ustat",/*[137] =*/ "statfs",
-                    /*[138] =*/ "fstatfs",/*[139] =*/ "sysfs",
-                    /*[140] =*/ "getpriority",/*[141] =*/ "setpriority",
-                    /*[142] =*/ "sched_setparam",/*[143] =*/ "sched_getparam",
-                    /*[144] =*/ "sched_setscheduler",/*[145] =*/ "sched_getscheduler",
-                    /*[146] =*/ "sched_get_priority_max",/*[147] =*/ "sched_get_priority_min",
-                    /*[148] =*/ "sched_rr_get_interval",/*[149] =*/ "mlock",
-                    /*[150] =*/ "munlock",/*[151] =*/ "mlockall",
-                    /*[152] =*/ "munlockall",/*[153] =*/ "vhangup",
-                    /*[154] =*/ "modify_ldt",/*[155] =*/ "pivot_root",
-                    /*[156] =*/ "",/*[157] =*/ "prctl",
-                    /*[158] =*/ "arch_prctl",/*[159] =*/ "adjtimex",
-                    /*[160] =*/ "setrlimit",/*[161] =*/ "chroot",
-                    /*[162] =*/ "sync",/*[163] =*/ "acct",
-                    /*[164] =*/ "settimeofday",/*[165] =*/ "mount",
-                    /*[166] =*/ "",/*[167] =*/ "swapon",
-                    /*[168] =*/ "swapoff",/*[169] =*/ "reboot",
-                    /*[170] =*/ "sethostname",/*[171] =*/ "setdomainname",
-                    /*[172] =*/ "iopl",/*[173] =*/ "ioperm",
-                    /*[174] =*/ "",/*[175] =*/ "init_module",
-                    /*[176] =*/ "delete_module",/*[177] =*/ "",
-                    /*[178] =*/ "",/*[179] =*/ "quotactl",
-                    /*[180] =*/ "",/*[181] =*/ "",
-                    /*[182] =*/ "",/*[183] =*/ "",
-                    /*[184] =*/ "",/*[185] =*/ "",
-                    /*[186] =*/ "gettid",/*[187] =*/ "readahead",
-                    /*[188] =*/ "setxattr",/*[189] =*/ "lsetxattr",
-                    /*[190] =*/ "fsetxattr",/*[191] =*/ "getxattr",
-                    /*[192] =*/ "lgetxattr",/*[193] =*/ "fgetxattr",
-                    /*[194] =*/ "listxattr",/*[195] =*/ "llistxattr",
-                    /*[196] =*/ "flistxattr",/*[197] =*/ "removexattr",
-                    /*[198] =*/ "lremovexattr",/*[199] =*/ "fremovexattr",
-                    /*[200] =*/ "tkill",/*[201] =*/ "time",
-                    /*[202] =*/ "futex",/*[203] =*/ "sched_setaffinity",
-                    /*[204] =*/ "sched_getaffinity",/*[205] =*/ "set_thread_area",
-                    /*[206] =*/ "io_setup",/*[207] =*/ "io_destroy",
-                    /*[208] =*/ "io_getevents",/*[209] =*/ "io_submit",
-                    /*[210] =*/ "io_cancel",/*[211] =*/ "get_thread_area",
-                    /*[212] =*/ "",/*[213] =*/ "epoll_create",
-                    /*[214] =*/ "",/*[215] =*/ "",
-                    /*[216] =*/ "remap_file_pages",/*[217] =*/ "getdents64",
-                    /*[218] =*/ "set_tid_address",/*[219] =*/ "restart_syscall",
-                    /*[220] =*/ "semtimedop",/*[221] =*/ "fadvise64",
-                    /*[222] =*/ "timer_create",/*[223] =*/ "timer_settime",
-                    /*[224] =*/ "timer_gettime",/*[225] =*/ "timer_getoverrun",
-                    /*[226] =*/ "timer_delete",/*[227] =*/ "clock_settime",
-                    /*[228] =*/ "clock_gettime",/*[229] =*/ "clock_getres",
-                    /*[230] =*/ "clock_nanosleep",/*[231] =*/ "exit_group",
-                    /*[232] =*/ "epoll_wait",/*[233] =*/ "epoll_ctl",
-                    /*[234] =*/ "tgkill",/*[235] =*/ "utimes",
-                    /*[236] =*/ "",/*[237] =*/ "mbind",
-                    /*[238] =*/ "set_mempolicy",/*[239] =*/ "get_mempolicy",
-                    /*[240] =*/ "mq_open",/*[241] =*/ "mq_unlink",
-                    /*[242] =*/ "mq_timedsend",/*[243] =*/ "mq_timedreceive",
-                    /*[244] =*/ "mq_notify",/*[245] =*/ "mq_getsetattr",
-                    /*[246] =*/ "kexec_load",/*[247] =*/ "waitid",
-                    /*[248] =*/ "add_key",/*[249] =*/ "request_key",
-                    /*[250] =*/ "keyctl",/*[251] =*/ "ioprio_set",
-                    /*[252] =*/ "ioprio_get",/*[253] =*/ "inotify_init",
-                    /*[254] =*/ "inotify_add_watch",/*[255] =*/ "inotify_rm_watch",
-                    /*[256] =*/ "migrate_pages",/*[257] =*/ "openat",
-                    /*[258] =*/ "mkdirat",/*[259] =*/ "mknodat",
-                    /*[260] =*/ "fchownat",/*[261] =*/ "futimesat",
-                    /*[262] =*/ "newfstatat",/*[263] =*/ "unlinkat",
-                    /*[264] =*/ "renameat",/*[265] =*/ "linkat",
-                    /*[266] =*/ "symlinkat",/*[267] =*/ "readlinkat",
-                    /*[268] =*/ "fchmodat",/*[269] =*/ "faccessat",
-                    /*[270] =*/ "pselect6",/*[271] =*/ "ppoll",
-                    /*[272] =*/ "unshare",/*[273] =*/ "set_robust_list",
-                    /*[274] =*/ "get_robust_list",/*[275] =*/ "splice",
-                    /*[276] =*/ "tee",/*[277] =*/ "sync_file_range",
-                    /*[278] =*/ "vmsplice",/*[279] =*/ "move_pages",
-                    /*[280] =*/ "utimensat",/*[281] =*/ "epoll_pwait",
-                    /*[282] =*/ "signalfd",/*[283] =*/ "timerfd_create",
-                    /*[284] =*/ "eventfd",/*[285] =*/ "fallocate",
-                    /*[286] =*/ "timerfd_settime",/*[287] =*/ "timerfd_gettime",
-                    /*[288] =*/ "accept4",/*[289] =*/ "signalfd4",
-                    /*[290] =*/ "eventfd2",/*[291] =*/ "epoll_create1",
-                    /*[292] =*/ "dup3",/*[293] =*/ "pipe2",
-                    /*[294] =*/ "inotify_init1",/*[295] =*/ "preadv",
-                    /*[296] =*/ "pwritev",/*[297] =*/ "rt_tgsigqueueinfo",
-                    /*[298] =*/ "perf_event_open",/*[299] =*/ "recvmmsg",
-                    /*[300] =*/ "fanotify_init",/*[301] =*/ "fanotify_mark",
-                    /*[302] =*/ "prlimit64",/*[303] =*/ "name_to_handle_at",
-                    /*[304] =*/ "open_by_handle_at",/*[305] =*/ "clock_adjtime",
-                    /*[306] =*/ "syncfs",/*[307] =*/ "sendmmsg",
-                    /*[308] =*/ "setns",/*[309] =*/ "getcpu",
-                    /*[310] =*/ "process_vm_readv",/*[311] =*/ "process_vm_writev",
-                    /*[312] =*/ "kcmp",/*[313] =*/ "finit_module",
-                    /*[314] =*/ "sched_setattr",/*[315] =*/ "sched_getattr",
-                    /*[316] =*/ "renameat2",/*[317] =*/ "seccomp",
-                    /*[318] =*/ "getrandom",/*[319] =*/ "memfd_create",
-                    /*[320] =*/ "kexec_file_load",/*[321] =*/ "bpf",
-                    /*[322] =*/ "execveat",/*[323] =*/ "userfaultfd",
-                    /*[324] =*/ "membarrier",/*[325] =*/ "mlock2",
-                    /*[326] =*/ "copy_file_range",/*[327] =*/ "preadv2",
-                    /*[328] =*/ "pwritev2",/*[329] =*/ "pkey_mprotect",
-                    /*[330] =*/ "pkey_alloc",/*[331] =*/ "pkey_free",
-                    /*[332] =*/ "statx",/*[333] =*/ "io_pgetevents",
-                    /*[334] =*/ "rseq",/*[335] =*/ "",
-                    /*[336] =*/ "",/*[337] =*/ "",
-                    /*[338] =*/ "",/*[339] =*/ "",
-                    /*[340] =*/ "",/*[341] =*/ "",
-                    /*[342] =*/ "",/*[343] =*/ "",
-                    /*[344] =*/ "",/*[345] =*/ "",
-                    /*[346] =*/ "",/*[347] =*/ "",
-                    /*[348] =*/ "",/*[349] =*/ "",
-                    /*[350] =*/ "",/*[351] =*/ "",
-                    /*[352] =*/ "",/*[353] =*/ "",
-                    /*[354] =*/ "",/*[355] =*/ "",
-                    /*[356] =*/ "",/*[357] =*/ "",
-                    /*[358] =*/ "",/*[359] =*/ "",
-                    /*[360] =*/ "",/*[361] =*/ "",
-                    /*[362] =*/ "",/*[363] =*/ "",
-                    /*[364] =*/ "",/*[365] =*/ "",
-                    /*[366] =*/ "",/*[367] =*/ "",
-                    /*[368] =*/ "",/*[369] =*/ "",
-                    /*[370] =*/ "",/*[371] =*/ "",
-                    /*[372] =*/ "",/*[373] =*/ "",
-                    /*[374] =*/ "",/*[375] =*/ "",
-                    /*[376] =*/ "",/*[377] =*/ "",
-                    /*[378] =*/ "",/*[379] =*/ "",
-                    /*[380] =*/ "",/*[381] =*/ "",
-                    /*[382] =*/ "",/*[383] =*/ "",
-                    /*[384] =*/ "",/*[385] =*/ "",
-                    /*[386] =*/ "",/*[387] =*/ "",
-                    /*[388] =*/ "",/*[389] =*/ "",
-                    /*[390] =*/ "",/*[391] =*/ "",
-                    /*[392] =*/ "",/*[393] =*/ "",
-                    /*[394] =*/ "",/*[395] =*/ "",
-                    /*[396] =*/ "",/*[397] =*/ "",
-                    /*[398] =*/ "",/*[399] =*/ "",
-                    /*[400] =*/ "",/*[401] =*/ "",
-                    /*[402] =*/ "",/*[403] =*/ "",
-                    /*[404] =*/ "",/*[405] =*/ "",
-                    /*[406] =*/ "",/*[407] =*/ "",
-                    /*[408] =*/ "",/*[409] =*/ "",
-                    /*[410] =*/ "",/*[411] =*/ "",
-                    /*[412] =*/ "",/*[413] =*/ "",
-                    /*[414] =*/ "",/*[415] =*/ "",
-                    /*[416] =*/ "",/*[417] =*/ "",
-                    /*[418] =*/ "",/*[419] =*/ "",
-                    /*[420] =*/ "",/*[421] =*/ "",
-                    /*[422] =*/ "",/*[423] =*/ "",
-                    /*[424] =*/ "pidfd_send_signal",/*[425] =*/ "io_uring_setup",
-                    /*[426] =*/ "io_uring_enter",/*[427] =*/ "io_uring_register",
-                    /*[428] =*/ "open_tree",/*[429] =*/ "move_mount",
-                    /*[430] =*/ "fsopen",/*[431] =*/ "fsconfig",
-                    /*[432] =*/ "fsmount",/*[433] =*/ "fspick",
-                    /*[434] =*/ "pidfd_open",/*[435] =*/ "clone3" };
-}
-
-#endif
-/*
-
-Following command in part thx to:
-https://unix.stackexchange.com/questions/445507/syscall-number-%E2%86%92-name-mapping-at-runtime
-
-Command to create mapping of system call number to system call name:
-
-#!/bin/bash
-
-awk 'BEGIN { print "#include <sys/syscall.h>" }
-    /p_syscall_meta/ { syscall = substr($NF, 19);
-    printf "[SYS_%s] = \"%s\", \n", syscall, syscall }' /proc/kallsyms \
-| gcc -E -P - \
-| sort -V \
-| grep "\[[0-9]" \
-| awk 'BEGIN {expectedIndex = 0;}
-    { actualIndex = $1;
-        gsub(/[\[\]]/, "", actualIndex);
-        if (actualIndex != expectedIndex)
-            for (; expectedIndex < actualIndex; expectedIndex++)
-                print "[" expectedIndex "] = \"\",";
-        print $0; expectedIndex++ }' \
-| tr -d "\n" \
-| sed -e "s/^/const char *syscalls[1024] = {/; s/,$/ };/" \
-| sed -e 's/,/,\n                /2;P;D' \
-| cat - <(echo) # new line at the end
-*/
--- a/src/krikkel/NCurses/DemoApp.cpp
+++ b/src/krikkel/NCurses/DemoApp.cpp
@ -1,147 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "DemoApp.hpp"
-#include "kNCurses/VerticalTilingWindowManager.hpp"
-#include "kNCurses/HorizontalTilingWindowManager.hpp"
-#include "kNCurses/Window.hpp"
-#include "kNCurses/PtyWindow.hpp"
-#include "../Debug.hpp"
-
-#include <unistd.h>
-#include <utmp.h>
-#include <cstdlib>
-
-namespace krikkel::NCurses
-{
-    using std::scoped_lock;
-
-    DemoApp::DemoApp() : NCursesApplication(false)
-    {
-
-    }
-
-    int DemoApp::run()
-    {
-        setUpWindows();
-        forkShell();
-        mainLoop();
-
-        return 0;
-    }
-
-    void DemoApp::setUpWindows()
-    {
-        windowManager
-            = new VerticalTilingWindowManager(Root_Window, &ncursesMutex);
-        topWindowManager
-            = new HorizontalTilingWindowManager(new Window(), &ncursesMutex);
-        bottomWindowManager
-            = new HorizontalTilingWindowManager(new Window(), &ncursesMutex);
-
-        windowManager->addWindow(topWindowManager);
-        ptyWindow = new PtyWindow(&ncursesMutex, 0, 0, 0, 0);
-        windowManager->addWindow(ptyWindow);
-        windowManager->addWindow(bottomWindowManager);
-        windowManager->updateLayout();
-        windowManager->refresh();
-
-        dummyWindowTopLeft = new Window();
-        topWindowManager->addWindow(dummyWindowTopLeft, 1);
-        dummyWindowTopLeft->addstr("t\no\np\n \nl\ne\nf\nt\n w\ni\nn\nd\no\nw");
-        dummyWindowTopRight = new Window(topWindowManager);
-        dummyWindowTopRight->addstr("top right window");
-
-        topWindowManager->updateLayout();
-        topWindowManager->refresh();
-
-        dummyWindowBottomLeft = new Window(bottomWindowManager);
-        dummyWindowBottomLeft->addstr("bottom left window");
-        dummyWindowBottomRight = new Window(bottomWindowManager);
-        dummyWindowBottomRight->addstr("bottom right window");
-
-        bottomWindowManager->updateLayout();
-        bottomWindowManager->refresh();
-    }
-
-    void DemoApp::forkShell()
-    {
-        if(fork() == 0)
-        {
-            const char *shellPath = getenv("SHELL");
-            if(!shellPath)
-                shellPath = "/bin/bash";
-
-            login_tty(ptyWindow->getFdPtyClient());
-            const int sizeArg = 2;
-            const char *arg[sizeArg] = {shellPath, NULL};
-            fprintf(stderr, "<CTRL>+C exits shell.\n\n");
-            execv(shellPath, const_cast<char * const *>(arg));
-            fprintf(stderr, "Well, well, well … could not start a shell. We "
-                            "tried `%s`. Maybe set `SHELL` environment variable"
-                            " to a working value?", shellPath);
-            exit(1);
-        }
-    }
-
-    void DemoApp::mainLoop()
-    {
-        while(true)
-        {
-            SingleUserInput input = windowManager->readSingleUserInput();
-            if(input.isNormalKey())
-            {
-                ptyWindow->writeUnicodeCharToClient(input.getRawInput());
-                {
-                    scoped_lock lock(ncursesMutex);
-                    dummyWindowTopRight->addch(input.getRawInput());
-                    dummyWindowTopRight->refresh();
-                }
-            }
-            if(input.isFunctionKey())
-            {
-                switch(input.getRawInput())
-                {
-                    case KEY_RESIZE:
-                        windowManager->updateLayout();
-                        break;
-                    case KEY_F(1):
-                        if(topWindowManager->isHidden())
-                            windowManager->showWindow(topWindowManager);
-                        else
-                            windowManager->hideWindow(topWindowManager);
-                        windowManager->updateLayout();
-                        windowManager->refresh();
-                        break;
-                    case KEY_F(2):
-                        if(ptyWindow->isHidden())
-                            windowManager->showWindow(ptyWindow);
-                        else
-                            windowManager->hideWindow(ptyWindow);
-                        windowManager->updateLayout();
-                        windowManager->refresh();
-                        break;
-                    case KEY_F(3):
-                        if(bottomWindowManager->isHidden())
-                            windowManager->showWindow(bottomWindowManager);
-                        else
-                            windowManager->hideWindow(bottomWindowManager);
-                        windowManager->updateLayout();
-                        windowManager->refresh();
-                        break;
-                    case KEY_F(4):
-                        windowManager->invertWindowsVisibility();
-                        windowManager->updateLayout();
-                        windowManager->refresh();
-                        break;
-                    case KEY_F(5):
-                        windowManager->refresh();
-                        break;
-                    default:
-                        ptyWindow->writeFunctionKeyToClient(input.mapKeyNcursesToVTerm());
-                }
-            }
-        }
-    }
-}
--- a/src/krikkel/NCurses/DemoApp.hpp
+++ b/src/krikkel/NCurses/DemoApp.hpp
@ -1,39 +0,0 @@
-/**
- * @brief demo application for the library
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#ifndef A3B2AE4E_0A39_468C_8CCA_E6508166702A
-#define A3B2AE4E_0A39_468C_8CCA_E6508166702A
-
-#include <cursesapp.h>
-#include <mutex>
-
-namespace krikkel::NCurses
-{
-    class VerticalTilingWindowManager;
-    class HorizontalTilingWindowManager;
-    class Window;
-    class PtyWindow;
-
-    class DemoApp : public NCursesApplication
-    {
-        public:
-            DemoApp();
-
-        private:
-            VerticalTilingWindowManager *windowManager;
-            HorizontalTilingWindowManager *topWindowManager, *bottomWindowManager;
-            Window *dummyWindowTopLeft, *dummyWindowTopRight
-                 , *dummyWindowBottomLeft, *dummyWindowBottomRight;
-            PtyWindow *ptyWindow;
-            std::recursive_mutex ncursesMutex;
-
-            int run() override;
-            void setUpWindows();
-            void forkShell();
-            void mainLoop();
-    };
-}
-
-#endif /* A3B2AE4E_0A39_468C_8CCA_E6508166702A */
--- a/src/krikkel/NCurses/HorizontalTilingWindowManager.cpp
+++ b/src/krikkel/NCurses/HorizontalTilingWindowManager.cpp
@ -1,41 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "kNCurses/HorizontalTilingWindowManager.hpp"
-#include "kNCurses/Window.hpp"
-#include "../Debug.hpp"
-
-#include <ncursesw/ncurses.h>
-#include <algorithm>
-
-namespace krikkel::NCurses
-{
-    using std::recursive_mutex;
-
-    HorizontalTilingWindowManager::HorizontalTilingWindowManager(NCursesWindow *rootWindow, std::recursive_mutex *ncursesMutex)
-            : TilingWindowManager(rootWindow, ncursesMutex)
-    {}
-
-    void HorizontalTilingWindowManager::resizeAndMoveWindow(Window *window, windowDimension dimension, windowPosition position)
-    {
-        __debug_log("(" + std::to_string(position + begx()) + ", " + std::to_string(0 + begy()) + ", " + std::to_string(dimension) + ", " + std::to_string(height()) + ")");
-        window->resize(height(), dimension);
-        window->mvwin(0 + begy(), position + begx());
-    }
-
-    TilingWindowManager::windowDimension HorizontalTilingWindowManager::getAvailableSpace()
-    {
-        return width();
-    }
-
-    void HorizontalTilingWindowManager::windowBorder()
-    {
-        vline(height());
-    }
-
-    void HorizontalTilingWindowManager::moveCursor(TilingWindowManager::windowPosition position)
-    {
-        move(0, position);
-    }
-}
--- a/src/krikkel/NCurses/PtyWindow.cpp
+++ b/src/krikkel/NCurses/PtyWindow.cpp
@ -1,367 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "kNCurses/PtyWindow.hpp"
-#include "../Debug.hpp"
-
-#include <cstdio>
-#include <unistd.h>
-#include <sys/select.h>
-#include <gsl/gsl>
-#include <cctype>
-#include <termios.h>
-#include <fcntl.h>
-#include <exception>
-#include <cerrno>
-
-namespace krikkel::NCurses
-{
-    using gsl::narrow;
-    using std::scoped_lock;
-    using std::recursive_mutex;
-    using std::system_error;
-    using std::system_category;
-    using std::string;
-
-    PtyWindow::PtyWindow(recursive_mutex *ncursesMutex, int lines, int columns, int y, int x)
-            : Window(lines, columns, y, x), ncursesMutex(ncursesMutex)
-    {
-        // to get the original terminal we need to shutdown ncurses for a moment
-        /// @todo maybe try `reset_prog_mode()` and `reset_shell_mode()` instead
-        ::endwin();
-        tcgetattr(STDIN_FILENO, &terminalParameters);
-        ::refresh();
-
-        winsize windowSize =
-        {
-            /*.ws_row =*/ narrow<short unsigned int>(this->height())
-          , /*.ws_col =*/ narrow<short unsigned int>(this->width())
-          , /*.y =*/ 0
-          , /*.x =*/ 0
-        };
-        openpty(&fdPtyHost, &fdPtyClient, NULL, &terminalParameters, &windowSize);
-
-        pseudoTerminal = vterm_new(windowSize.ws_row, windowSize.ws_col);
-        vterm_set_utf8(pseudoTerminal, true);
-        pseudoTerminalScreen = vterm_obtain_screen(pseudoTerminal);
-        vterm_screen_reset(pseudoTerminalScreen, true);
-        vterm_screen_set_callbacks(pseudoTerminalScreen, &screenCallbacks, this);
-        vterm_output_set_callback(pseudoTerminal, &staticHandlerOutput, this);
-        vterm_screen_enable_altscreen(pseudoTerminalScreen, true);
-
-        //raw();         // — cbreak might suffice
-        //noecho();      // — already set by NCursesWindow
-        keypad(true);    /// — already set by NCursesWindow
-        //meta(true);    // — already set by NCursesWindow
-        //nodelay(true); // — @todo would need some programming, not sure if useful
-        nonl();
-
-        /// @todo block all signals, this thread does not handle any
-        readPtyClientThread =
-                std::thread(&PtyWindow::readFromPtyClientThreadMethod, this);
-    }
-
-    PtyWindow::~PtyWindow()
-    {
-        close(fdPtyHost);
-        close(fdPtyClient);
-        vterm_free(pseudoTerminal);
-    }
-
-    int PtyWindow::getFdPtyClient() const
-    {
-        return fdPtyClient;
-    }
-
-    void PtyWindow::writeToPtyClient(const char *output, size_t length)
-    {
-        size_t bytesWritten = write(fdPtyHost, output, length);
-        /// @todo this is a bit too simple; partial write is possible
-        if(bytesWritten != length)
-        {
-            string basicError("Could not write to PTY client (i. e. the shell).");
-            throw system_error(errno, system_category(), basicError);
-        }
-        //__debug_log("written to PTY client: '" + __debug_make_bytes_printable(std::string(output, length)) + '\'');
-    }
-
-    void PtyWindow::writeUnicodeCharToClient(wint_t character)
-    {
-        scoped_lock lock(ptyMutex);
-        vterm_keyboard_unichar(pseudoTerminal, character, VTERM_MOD_NONE);
-    }
-
-    void PtyWindow::writeFunctionKeyToClient(VTermKey key)
-    {
-        scoped_lock lock(ptyMutex);
-        //__debug_log("writing key: " + std::to_string(key));
-        vterm_keyboard_key(pseudoTerminal, key, VTERM_MOD_NONE);
-    }
-
-    void PtyWindow::readFromPtyClientThreadMethod()
-    {
-        /// @todo in theory, there is no need for a timeout or select …
-        ///       file descriptor is blocking
-        while(1)
-        {
-            readFromPtyClient();
-            struct timeval timeout = { /*.tv_sec =*/ 0, /*.tv_usec =*/ 200000 };
-            fd_set readFds;
-
-            FD_ZERO(&readFds);
-            FD_SET(fdPtyHost, &readFds);
-            if(select(fdPtyHost + 1, &readFds, NULL, NULL, &timeout) < 0)
-                break;
-        }
-    }
-
-    void PtyWindow::readFromPtyClient()
-    {
-        size_t bytesRead = read(fdPtyHost, ptyClientOutputBuffer, PTY_CLIENT_OUTPUT_BUFFER_SIZE);
-        if(bytesRead != (size_t) -1 && bytesRead != 0)
-        {
-            scoped_lock lock(ptyMutex, *ncursesMutex);
-            vterm_input_write(pseudoTerminal, ptyClientOutputBuffer, bytesRead);
-        }
-        //__debug_log("read from PTY client: '" + __debug_make_bytes_printable(std::string(ptyClientOutputBuffer, bytesRead)) + '\'');
-    }
-
-    VTermScreenCallbacks PtyWindow::screenCallbacks =
-    {
-          /*.damage =*/ staticHandlerDamage
-        , /*.moverect =*/ staticHandlerMoveRect
-        , /*.movecursor =*/ staticHandlerMoveCursor
-        , /*.settermprop =*/ staticHandlerSetTermProp
-        , /*.bell =*/ staticHandlerBell
-        , /*.resize =*/ staticHandlerResize
-        , /*.sb_pushline =*/ staticHandlerPushLine
-        , /*.sb_popline =*/ staticHandlerPopLine
-    };
-
-    int PtyWindow::handlerDamage(VTermRect rect)
-    {
-        scoped_lock lock(ptyMutex, *ncursesMutex);
-
-        for(int x = rect.start_col; x < rect.end_col; ++x)
-            for(int y = rect.start_row; y < rect.end_row; ++y)
-                copyPtyCellToNCursesWindow(x, y);
-
-        refresh();
-
-        return 0;
-    }
-
-    int PtyWindow::handlerMoveRect(VTermRect dest, VTermRect src)
-    {
-        (void) dest;
-        (void) src;
-
-        __debug_log("(unimplemented) move content in rectangle from ("
-              + std::to_string(src.start_col) + ", "
-              + std::to_string(src.start_row) + ", "
-              + std::to_string(src.end_col) + ", "
-              + std::to_string(src.end_row) + ") "
-              + "size: " + std::to_string((src.start_col - src.end_col) * (src.start_row - src.end_row))
-              + " to ("
-              + std::to_string(dest.start_col) + ", "
-              + std::to_string(dest.start_row) + ", "
-              + std::to_string(dest.end_col) + ", "
-              + std::to_string(dest.end_row) + ") "
-              + "size: " + std::to_string((dest.start_col - dest.end_col) * (dest.start_row - dest.end_row)));
-        return 0;
-    }
-
-    int PtyWindow::handlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible)
-    {
-        (void) oldpos;
-        (void) visible;
-
-        scoped_lock lock(*ncursesMutex);
-        cursorX = pos.col;
-        cursorY = pos.row;
-        refresh();
-        return 0;
-    }
-
-    int PtyWindow::handlerSetTermProp(VTermProp prop, VTermValue *val)
-    {
-        (void) prop;
-        (void) val;
-
-        /// @todo maybe use "vterm_get_prop_type() —> bool, number, string"?
-        __debug_stringify_switch_begin(handlerSetTermProp, prop, val);
-            __debug_stringify_switch_case(VTERM_PROP_CURSORVISIBLE);
-            __debug_stringify_switch_case(VTERM_PROP_CURSORBLINK);
-            __debug_stringify_switch_case(VTERM_PROP_ALTSCREEN);
-                __debug_stringify_switch_last_case_bool(VTERM_PROP_REVERSE, val->boolean);
-            __debug_stringify_switch_case(VTERM_PROP_TITLE);
-                __debug_stringify_switch_last_case_string(VTERM_PROP_ICONNAME, val->string);
-            __debug_stringify_switch_case(VTERM_PROP_CURSORSHAPE);
-                __debug_stringify_switch_last_case_number(VTERM_PROP_MOUSE, val->number);
-        __debug_stringify_switch_end(prop);
-
-        __debug_log(std::string("unimplemented handler called: ")
-                  + __debug_stringify_get_string(handlerSetTermProp)
-                   );
-        return 0;
-    }
-
-    int PtyWindow::handlerBell()
-    {
-        beep();
-        return 0;
-    }
-
-    int PtyWindow::handlerResize(int rows, int cols)
-    {
-        (void) rows;
-        (void) cols;
-
-        __debug_log("unimplemented handler called");
-        return 0;
-    }
-
-    int PtyWindow::handlerPushLine(int cols, const VTermScreenCell *cells)
-    {
-        (void) cols;
-        (void) cells;
-
-        __debug_log("(unimplemented) push line with " + std::to_string(cols) + " columns");
-        return 0;
-    }
-
-    int PtyWindow::handlerPopLine(int cols, VTermScreenCell *cells)
-    {
-        (void) cols;
-        (void) cells;
-
-        __debug_log("unimplemented handler called");
-        return 0;
-    }
-
-    attr_t PtyWindow::extractAttributesFromVTermCell(VTermScreenCell vTermCell)
-    {
-        (void) vTermCell;
-
-        attr_t result = A_NORMAL;
-        //__debug_log("unimplemented method called");
-        return result;
-    }
-
-    short PtyWindow::extractColorFromVTermCell(VTermScreenCell vTermCell)
-    {
-        (void) vTermCell;
-
-        //__debug_log("unimplemented method called");
-        return 0;
-    }
-
-    void PtyWindow::copyPtyCellToNCursesWindow(int x, int y)
-    {
-        VTermPos cellPosition = {y, x};
-        VTermScreenCell vTermCell;
-        cchar_t converted;
-        attr_t formatting;
-        short colorPair;
-        wchar_t character;
-
-        vterm_screen_get_cell(pseudoTerminalScreen, cellPosition, &vTermCell);
-        formatting = extractAttributesFromVTermCell(vTermCell);
-        colorPair = extractColorFromVTermCell(vTermCell);
-
-        if(vTermCell.chars[0] == 0)
-            character = ' ';
-        else
-            character = *vTermCell.chars;
-
-        //__debug_log(std::string("written '") + (char) character + std::string("' ") + std::to_string(x) + ", " + std::to_string(y));
-        setcchar(&converted, &character, formatting, colorPair, NULL);
-        {
-            move(cellPosition.row, cellPosition.col);
-            chgat(1, formatting, colorPair, NULL);
-            add_wch(&converted);
-        }
-    }
-
-    int PtyWindow::refresh()
-    {
-        //__debug_log("refreshing");
-        scoped_lock lock(*ncursesMutex);
-        move(cursorY, cursorX);
-        return Window::refresh();
-    }
-
-    /// @todo potential racing condition where drawing into terminal while
-    ///       resizing?
-    int PtyWindow::resize(int rows, int cols)
-    {
-        scoped_lock lock(ptyMutex, *ncursesMutex);
-
-        winsize windowSize =
-        {
-            /*.ws_row =*/ narrow<unsigned short>(rows)
-          , /*.ws_col =*/ narrow<unsigned short>(cols)
-          , 0
-          , 0
-        };
-        ioctl(fdPtyHost, TIOCSWINSZ, &windowSize);
-        vterm_set_size(pseudoTerminal, rows, cols);
-
-        return Window::resize(rows, cols);
-    }
-
-    int PtyWindow::staticHandlerDamage(VTermRect rect, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerDamage(rect);
-    }
-
-    int PtyWindow::staticHandlerMoveRect(VTermRect dest, VTermRect src, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerMoveRect(dest, src);
-    }
-
-    int PtyWindow::staticHandlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerMoveCursor(pos, oldpos, visible);
-    }
-
-    int PtyWindow::staticHandlerSetTermProp(VTermProp prop, VTermValue *val, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerSetTermProp(prop, val);
-    }
-
-    int PtyWindow::staticHandlerBell(void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerBell();
-    }
-
-    int PtyWindow::staticHandlerResize(int rows, int cols, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerResize(rows, cols);
-    }
-
-    int PtyWindow::staticHandlerPushLine(int cols, const VTermScreenCell *cells, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerPushLine(cols, cells);
-    }
-
-    int PtyWindow::staticHandlerPopLine(int cols, VTermScreenCell *cells, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        return instance->handlerPopLine(cols, cells);
-    }
-
-    void PtyWindow::staticHandlerOutput(const char *s, size_t len, void *user)
-    {
-        PtyWindow *instance = static_cast<PtyWindow *>(user);
-        instance->writeToPtyClient(s, len);
-   }
-}
--- a/src/krikkel/NCurses/TilingWindowManager.cpp
+++ b/src/krikkel/NCurses/TilingWindowManager.cpp
@ -1,170 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "kNCurses/TilingWindowManager.hpp"
-#include "kNCurses/Window.hpp"
-#include "../Debug.hpp"
-
-#include <ncursesw/ncurses.h>
-#include <algorithm>
-
-namespace krikkel::NCurses
-{
-    using std::list;
-    using std::pair;
-    using std::recursive_mutex;
-    using std::scoped_lock;
-
-    TilingWindowManager::TilingWindowManager(NCursesWindow *rootWindow, recursive_mutex *ncursesMutex)
-            : Window(*rootWindow), ncursesMutex(ncursesMutex)
-    {}
-
-    void TilingWindowManager::addWindow(Window *window, windowDimension size)
-    {
-        WindowStackElement stackElement(window, size);
-        stack.push_back(stackElement);
-        visibleStack.push_back(stackElement);
-    }
-
-    std::recursive_mutex *TilingWindowManager::getNCursesMutex()
-    {
-        return ncursesMutex;
-    }
-
-    void TilingWindowManager::hideWindow(Window *window)
-    {
-        if(window->hidden)
-            return;
-
-        visibleStack.remove_if(
-                [window](WindowStackElement element)
-                {
-                    return element.first == window;
-                });
-        window->hidden = true;
-    }
-
-    void TilingWindowManager::showWindow(Window *window)
-    {
-        if(!window->hidden)
-            return;
-
-        list<WindowStackElement>::iterator currentVisibleWindowElement = visibleStack.begin();
-        for(WindowStackElement currentWindowElement : stack)
-        {
-            if(currentWindowElement.first == window)
-            {
-                visibleStack.insert(currentVisibleWindowElement, currentWindowElement);
-                window->hidden = false;
-                break;
-            }
-            if(currentWindowElement != (*currentVisibleWindowElement))
-                continue;
-            ++currentVisibleWindowElement;
-        }
-    }
-
-    void TilingWindowManager::invertWindowsVisibility()
-    {
-        list<WindowStackElement> originallyVisibleStack(visibleStack);
-        list<WindowStackElement>::iterator originallyVisibleStackIterator = originallyVisibleStack.begin();
-        visibleStack.clear();
-
-        for(WindowStackElement currentWindowElement : stack)
-            if(originallyVisibleStackIterator != originallyVisibleStack.end()
-                    && currentWindowElement == *originallyVisibleStackIterator)
-            {
-                currentWindowElement.first->hidden = true;
-                ++originallyVisibleStackIterator;
-                continue;
-            }
-            else
-            {
-                currentWindowElement.first->hidden = false;
-                visibleStack.push_back(currentWindowElement);
-            }
-    }
-
-    int TilingWindowManager::resize(int rows, int cols)
-    {
-        int result = Window::resize(rows, cols);
-        updateLayout();
-        return result;
-    }
-
-    int TilingWindowManager::refresh()
-    {
-        scoped_lock lock(*ncursesMutex);
-
-        int result = Window::refresh();
-
-        for(WindowStackElement stackElement : visibleStack)
-            // @todo there are return values; compound them?
-            stackElement.first->refresh();
-
-        return result;
-    }
-
-    void TilingWindowManager::updateLayout()
-    {
-        scoped_lock lock(*ncursesMutex);
-
-        size_t stackSize = visibleStack.size();
-        if(stackSize == 0)
-        {
-            clear();
-            return;
-        }
-
-        int unitSize = getRelativeUnitSizeForVisibleWindows(getAvailableSpace()) - 1;
-        windowPosition position = 0;
-        auto lastButNotLeast = prev(visibleStack.end());
-        for(auto stackElementIterator = visibleStack.begin()
-                ; stackElementIterator != lastButNotLeast
-                ; ++stackElementIterator)
-        {
-            WindowStackElement stackElement = *stackElementIterator;
-            Window *window = stackElement.first;
-            if(!window->isHidden())
-            {
-                int windowShift;
-                int windowSize = stackElement.second;
-                if(windowSize < 0)
-                    windowShift = unitSize * (-windowSize);
-                else
-                    windowShift = windowSize;
-
-                resizeAndMoveWindow(window, windowShift, position);
-                position += windowShift;
-                __debug_log("drawing line at " + std::to_string(position));
-                moveCursor(position++);
-                windowBorder();
-            }
-         }
-       resizeAndMoveWindow((*lastButNotLeast).first, getAvailableSpace() - position, position);
-    }
-
-
-    TilingWindowManager::windowDimension TilingWindowManager::getRelativeUnitSizeForVisibleWindows(windowDimension spaceAvailable)
-    {
-        uint16_t numberOfRelativeUnits = 0;
-        windowDimension absoluteSum = 0;
-
-        for(WindowStackElement stackElement : visibleStack)
-        {
-            windowDimension size = stackElement.second;
-            if(size < 0)
-                numberOfRelativeUnits -= size;
-            else
-                absoluteSum += size;
-        }
-
-        windowDimension relativeUnitSize = (spaceAvailable - absoluteSum) / numberOfRelativeUnits;
-        windowDimension remainder = (spaceAvailable - absoluteSum - relativeUnitSize * numberOfRelativeUnits);
-        if(remainder > 0 && remainder * 2 < numberOfRelativeUnits)
-            ++relativeUnitSize;
-
-        return relativeUnitSize;
-    }
-}
--- a/src/krikkel/NCurses/VerticalTilingWindowManager.cpp
+++ b/src/krikkel/NCurses/VerticalTilingWindowManager.cpp
@ -1,42 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "kNCurses/VerticalTilingWindowManager.hpp"
-#include "kNCurses/Window.hpp"
-#include "../Debug.hpp"
-
-#include <ncursesw/ncurses.h>
-#include <algorithm>
-
-namespace krikkel::NCurses
-{
-    using std::recursive_mutex;
-
-    VerticalTilingWindowManager::VerticalTilingWindowManager(NCursesWindow *rootWindow, std::recursive_mutex *ncursesMutex)
-            : TilingWindowManager(rootWindow, ncursesMutex)
-    {}
-
-    void VerticalTilingWindowManager::resizeAndMoveWindow(Window *window, windowDimension dimension, windowPosition position)
-    {
-        __debug_log("(" + std::to_string(0 + begx()) + ", " + std::to_string(position +  begy()) + ", " + std::to_string(width()) + ", " + std::to_string(dimension) + ")");
-        window->resize(dimension, width());
-        window->mvwin(position + begy(), 0 + begx());
-    }
-
-    TilingWindowManager::windowDimension VerticalTilingWindowManager::getAvailableSpace()
-    {
-        return height();
-    }
-
-    void VerticalTilingWindowManager::windowBorder()
-    {
-        hline(width());
-    }
-
-    void VerticalTilingWindowManager::moveCursor(TilingWindowManager::windowPosition position)
-    {
-        move(position, 0);
-    }
-
-}
--- a/src/krikkel/NCurses/Window.cpp
+++ b/src/krikkel/NCurses/Window.cpp
@ -1,71 +0,0 @@
-/**
- * @author Christian Burger (christian@krikkel.de)
- */
-
-#include "kNCurses/Window.hpp"
-#include "kNCurses/VerticalTilingWindowManager.hpp"
-
-namespace krikkel::NCurses
-{
-    Window::Window() : NCursesWindow(0, 0, 0, 0)
-    {}
-
-    Window::Window(TilingWindowManager *windowManager)
-            : NCursesWindow(0, 0, 0, 0)
-    {
-        windowManager->addWindow(this);
-        windowManager->updateLayout();
-    }
-
-    Window::Window(const NCursesWindow &window)
-            : NCursesWindow(window)
-    {}
-
-    Window::Window(int lines, int columns, int y, int x)
-            : NCursesWindow(lines, columns, y, x)
-    {}
-
-    int Window::addnwstr(const wchar_t *wstr, int n)
-    {
-        return ::waddnwstr(w, wstr, n);
-    }
-
-    int Window::add_wch(const cchar_t *character)
-    {
-        return ::wadd_wch(w, character);
-    }
-
-    int Window::ins_wch(const cchar_t *character)
-    {
-        return ::wins_wch(w, character);
-    }
-
-    int Window::get_wch(wint_t *character)
-    {
-        return ::wget_wch(w, character);
-    }
-
-    bool Window::isHidden()
-    {
-        return hidden;
-    }
-
-    SingleUserInput Window::readSingleUserInput()
-    {
-        wint_t input;
-        int result = get_wch(&input);
-        return SingleUserInput(result, input);
-    }
-
-    int Window::resize(int rows, int cols)
-    {
-        return NCursesWindow::wresize(rows, cols);
-    }
-
-    int Window::refresh()
-    {
-        if(!hidden)
-            return NCursesWindow::refresh();
-        return 0;
-    }
-}