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Use concatStringSep primop

gstqt5
Eelco Dolstra 2015-07-24 02:38:46 +02:00
parent 447afef153
commit 6f6f66ac98
1 changed files with 7 additions and 3 deletions
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10
lib/strings.nix
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@ -12,7 +12,11 @@ rec {
# Concatenate a list of strings.
concatStrings = lib.foldl' (x: y: x + y) "";
concatStrings =
if builtins ? concatStringsSep then
builtins.concatStringsSep ""
else
lib.foldl' (x: y: x + y) "";
# Map a function over a list and concatenate the resulting strings.
@ -31,8 +35,8 @@ rec {
# Concatenate a list of strings with a separator between each element, e.g.
# concatStringsSep " " ["foo" "bar" "xyzzy"] == "foo bar xyzzy"
concatStringsSep = separator: list:
concatStrings (intersperse separator list);
concatStringsSep = builtins.concatStringsSep or (separator: list:
concatStrings (intersperse separator list));
concatMapStringsSep = sep: f: list: concatStringsSep sep (map f list);
concatImapStringsSep = sep: f: list: concatStringsSep sep (lib.imap f list);