mirror of
https://github.com/nmattia/niv.git
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61 lines
1.6 KiB
Nix
61 lines
1.6 KiB
Nix
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{ lib
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, writeText
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, runCommand
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}:
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rec
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{
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# Lists all the (relative paths to the) files in the directory.
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listFilesInDir = dir:
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let
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go = dir: dirName:
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lib.lists.concatLists
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(
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lib.attrsets.mapAttrsToList
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(path: ty:
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if ty == "directory"
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then
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go "${dir}/${path}" "${dirName}${path}/"
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else
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[ "${dirName}${path}" ]
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)
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(builtins.readDir dir)
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);
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in go dir "";
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# Like nixpkgs' sourceByRegex but doesn't depend on the directory name when
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# computing the hash. Also doesn't require matching on the dir name to
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# actually enter the dir.
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sourceByRegex = name: src: regexes:
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let
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files = builtins.filter (x: x.keep) (map mk (listFilesInDir src));
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mk = path:
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let relPath = lib.removePrefix (toString src + "/") (toString path);
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in
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{ inherit relPath;
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path = src + ("/" + path);
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keep = lib.any (re: builtins.match re relPath != null) regexes;
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};
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files' = map (x: x.path) files;
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paths' = map (x: x.relPath) files;
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filesAbs = writeText "foo" (lib.concatStringsSep "\n" files');
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filesRel = writeText "bar" (lib.concatStringsSep "\n" paths');
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in
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runCommand "source-${name}" {}
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''
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mkdir -p $out
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paste ${filesAbs} ${filesRel} | while IFS="$(printf '\t')" read -r f1 f2
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do
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f="$out/$f2"
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mkdir -p $(dirname $f)
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echo $f1
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echo $f2
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echo $f
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cp $f1 $f
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done
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'';
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}
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