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lib/strings: add readPathsFromFile

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Thomas Tuegel 2015-12-12 19:33:02 -06:00
parent 97834fc233
commit 8baebb55d4
1 changed files with 15 additions and 0 deletions
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15
lib/strings.nix
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@ -235,4 +235,19 @@ rec {
then may_be_int
else throw "Could not convert ${str} to int.";
# Read a list of paths from `file', relative to the `rootPath'. Lines
# beginning with `#' are treated as comments and ignored. Whitespace
# is significant.
readPathsFromFile = rootPath: file:
let
root = toString rootPath;
lines =
builtins.map (lib.removeSuffix "\n")
(lib.splitString "\n" (builtins.readFile file));
removeComments = lib.filter (line: !(lib.hasPrefix "#" line));
relativePaths = removeComments lines;
absolutePaths = builtins.map (path: builtins.toPath (root + "/" + path)) relativePaths;
in
absolutePaths;
}