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Merge pull request #67996 from roberth/cleanSourceWith-name

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lib.cleanSourceWith: Allow name to be set, optional filter, doc
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Silvan Mosberger 2019-09-06 21:11:12 +02:00 committed by GitHub
parent 6d7282d74a 9a2180fa0b
commit d1bb36d5cb
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1 changed files with 33 additions and 4 deletions
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37
lib/sources.nix
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@ -36,18 +36,47 @@ rec {
# allowing you to chain multiple calls together without any
# intermediate copies being put in the nix store.
#
# lib.cleanSourceWith f (lib.cleanSourceWith g ./.) # Succeeds!
# builtins.filterSource f (builtins.filterSource g ./.) # Fails!
cleanSourceWith = { filter, src }:
# lib.cleanSourceWith {
# filter = f;
# src = lib.cleanSourceWith {
# filter = g;
# src = ./.;
# };
# }
# # Succeeds!
#
# builtins.filterSource f (builtins.filterSource g ./.)
# # Fails!
#
# Parameters:
#
# src: A path or cleanSourceWith result to filter and/or rename.
#
# filter: A function (path -> type -> bool)
# Optional with default value: constant true (include everything)
# The function will be combined with the && operator such
# that src.filter is called lazily.
# For implementing a filter, see
# https://nixos.org/nix/manual/#builtin-filterSource
#
# name: Optional name to use as part of the store path.
# This defaults `src.name` or otherwise `baseNameOf src`.
# We recommend setting `name` whenever `src` is syntactically `./.`.
# Otherwise, you depend on `./.`'s name in the parent directory,
# which can cause inconsistent names, defeating caching.
#
cleanSourceWith = { filter ? _path: _type: true, src, name ? null }:
let
isFiltered = src ? _isLibCleanSourceWith;
origSrc = if isFiltered then src.origSrc else src;
filter' = if isFiltered then name: type: filter name type && src.filter name type else filter;
name' = if name != null then name else if isFiltered then src.name else baseNameOf src;
in {
inherit origSrc;
filter = filter';
outPath = builtins.filterSource filter' origSrc;
outPath = builtins.path { filter = filter'; path = origSrc; name = name'; };
_isLibCleanSourceWith = true;
name = name';
};
# Filter sources by a list of regular expressions.