fixes #1

* demo app: using `SHELL` environment var or `/bin/bash` as default
* removed some debug messages
* enabled all vterm screen handlers; if not implemented there is a debug
message
* fixed and improved cursor position — was sometimes off; e. g. if
pressing backspace
* stubs for some functions required for implementing #3

NCursesPtyApp.cpp

@@ -8,9 +8,15 @@
 
 #include <unistd.h>
 #include <utmp.h>
+#include <cstdlib>
 
 namespace krikkel::NCursesPty
 {
+    NCursesPtyApp::NCursesPtyApp() : NCursesApplication(false)
+    {
+
+    }
+
     int NCursesPtyApp::run()
     {
         NCursesPtyWindow *ptyWindow = new NCursesPtyWindow(
@@ -21,18 +27,25 @@ namespace krikkel::NCursesPty
 
         if(fork() == 0)
         {
-            /// @todo close(ptyWindow->getFdPtyHost()); ???
+            const char *shellPath = getenv("SHELL");
+            if(!shellPath)
+                shellPath = "/bin/bash";
+
             login_tty(ptyWindow->getFdPtyClient());
             const int sizeArg = 2;
-            const char *arg[sizeArg] = {"/bin/bash", NULL};
+            const char *arg[sizeArg] = {shellPath, NULL};
-
+            fprintf(stderr, "<CTRL>+C exits shell.\n\n");
-            execv("/bin/bash", const_cast<char * const *>(arg));
+            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);
         }
 
         int input;
-        while((input = ptyWindow->getch()) != 27)
+        while(true)
         {
-            __debug_log("input: " + std::to_string(input));
+            input = ptyWindow->getch();
             ptyWindow->writeToClient((unsigned char) input);
         }
 

NCursesPtyApp.hpp

@@ -12,6 +12,10 @@ namespace krikkel::NCursesPty
 {
     class NCursesPtyApp : public NCursesApplication
     {
+        public:
+            NCursesPtyApp();
+
+        private:
             int run() override;
     };
 }

NCursesPtyWindow.cpp

@@ -60,7 +60,6 @@ namespace krikkel::NCursesPty
     /// @todo maybe implement a function with a string buffer
     void NCursesPtyWindow::writeToClient(char character)
     {
-        //__debug_log(std::string("written '") + character + "' to client");
         write(fdPtyHost, &character, sizeof(character));
     }
 
@@ -86,45 +85,27 @@ namespace krikkel::NCursesPty
         size_t bytesRead = read(fdPtyHost, clientOutputBuffer, CLIENT_OUTPUT_BUFFER_SIZE);
         if(bytesRead)
             vterm_input_write(pseudoTerminal, clientOutputBuffer, bytesRead);
-        __debug_log("read " + std::to_string(bytesRead) + " bytes from PTY client");
-        /*string readable;
-        for(char character : clientOutputBuffer)
-            if(std::isprint((unsigned char) character))
-                readable += character;
-            else
-                readable += "\\" + std::to_string((int) character) + "/";
-        __debug_log("read: '" + readable + "'");*/
     }
 
     VTermScreenCallbacks NCursesPtyWindow::screenCallbacks =
     {
         .damage = staticHandlerDamage,
-/*        .moverect = staticHandlerMoveRect,
+        .moverect = staticHandlerMoveRect,
         .movecursor = staticHandlerMoveCursor,
         .settermprop = staticHandlerSetTermProp,
         .bell = staticHandlerBell,
         .resize = staticHandlerResize,
         .sb_pushline = staticHandlerPushLine,
-        .sb_popline = staticHandlerPopLine,*/
+        .sb_popline = staticHandlerPopLine,
     };
 
     int NCursesPtyWindow::handlerDamage(VTermRect rect)
     {
-        __debug_log("damage to rectangle ("
-              + std::to_string(rect.start_col) + ", "
-              + std::to_string(rect.start_row) + ", "
-              + std::to_string(rect.end_col) + ", "
-              + std::to_string(rect.end_row) + ") "
-              + "size: " + std::to_string((rect.start_col - rect.end_col) * (rect.start_row - rect.end_row)) );
-
-        int cursorX, cursorY;
-        getyx(cursorY, cursorX);
-
         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);
 
-        move(cursorY, cursorX);
+        refresh();
 
         return 0;
     }
@@ -148,11 +129,9 @@ namespace krikkel::NCursesPty
 
     int NCursesPtyWindow::handlerMoveCursor(VTermPos pos, VTermPos oldpos, int visible)
     {
-        __debug_log("cursor moved to ("
+        cursorX = pos.col;
-              + std::to_string(pos.col) + ", "
+        cursorY = pos.row;
-              + std::to_string(pos.row) + ") "
+        refresh();
-              + "visible: " + (visible ? "true" : "false"));
-        move(pos.row, pos.col);
         return 0;
     }
 
@@ -222,15 +201,52 @@ namespace krikkel::NCursesPty
         return 0;
     }
 
+    attr_t NCursesPtyWindow::extractAttributesFromVTermCell(VTermScreenCell vTermCell)
+    {
+        attr_t result = A_NORMAL;
+        __debug_log("unimplemented method called");
+        return result;
+    }
+
+    short NCursesPtyWindow::extractColorFromVTermCell(VTermScreenCell vTermCell)
+    {
+        __debug_log("unimplemented method called");
+        return 0;
+    }
+
     void NCursesPtyWindow::copyPtyCellToNCursesWindow(int x, int y)
     {
         VTermPos cellPosition = {y, x};
-        VTermScreenCell cell;
+        VTermScreenCell vTermCell;
-        vterm_screen_get_cell(pseudoTerminalScreen, cellPosition, &cell);
+        cchar_t converted;
-        move(y, x);
+        attr_t formatting;
-        addch(cell.chars[0] ? cell.chars[0] : ' ' );
+        short colorPair;
-        /// @todo boy, is this expensive …
+        wchar_t character;
-        refresh();
+
+        vterm_screen_get_cell(pseudoTerminalScreen, cellPosition, &vTermCell);
+        formatting = extractAttributesFromVTermCell(vTermCell);
+        colorPair = extractColorFromVTermCell(vTermCell);
+
+        if(vTermCell.chars[0] == 0)
+            character = ' ';
+        else
+            character = *vTermCell.chars;
+
+        setcchar(&converted, &character, formatting, colorPair, NULL);
+        move(cellPosition.row, cellPosition.col);
+        chgat(1, formatting, colorPair, NULL);
+        add_wch(&converted);
+    }
+
+    int NCursesPtyWindow::add_wch(cchar_t *character)
+    {
+        return ::wadd_wch(w, character);
+    }
+
+    int NCursesPtyWindow::refresh()
+    {
+        move(cursorY, cursorX);
+        return NCursesWindow::refresh();
     }
 
     int NCursesPtyWindow::staticHandlerDamage(VTermRect rect, void *user)

NCursesPtyWindow.hpp

@@ -9,6 +9,12 @@
 #include <string>
 #include <thread>
 
+#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
+
 namespace krikkel::NCursesPty
 {
     class NCursesPtyWindow : public NCursesWindow
@@ -20,6 +26,9 @@ namespace krikkel::NCursesPty
             int getFdPtyClient() const;
             void writeToClient(char character);
 
+            int add_wch(cchar_t *character);
+            int refresh() override;
+
         private:
             int fdPtyHost, fdPtyClient;
             struct termios terminalParameters;
@@ -29,6 +38,7 @@ namespace krikkel::NCursesPty
             /// @todo one line is at most 4096 chars long
             static const u_int CLIENT_OUTPUT_BUFFER_SIZE = 512;
             char clientOutputBuffer[CLIENT_OUTPUT_BUFFER_SIZE];
+            uint16_t cursorX, cursorY;
 
             std::thread readPtyClientThread;
             void readFromPtyClientThreadMethod();
@@ -43,6 +53,8 @@ namespace krikkel::NCursesPty
             int handlerPushLine(int cols, const VTermScreenCell *cells);
             int handlerPopLine(int cols, VTermScreenCell *cells);
 
+            attr_t extractAttributesFromVTermCell(VTermScreenCell cell);
+            short extractColorFromVTermCell(VTermScreenCell cell);
             void copyPtyCellToNCursesWindow(int x, int y);
 
             static int staticHandlerDamage(VTermRect rect, void *user);