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{ lib, writeTextFile, buildPackages }:
# See https://people.freedesktop.org/~dbn/pkg-config-guide.html#concepts
{ name # The name of the pc file
# keywords
# provide a default description for convenience. it's not important but still required by pkg-config.
, description ? "A pkg-config file for ${name}"
, url ? ""
, version ? ""
, requires ? [ ]
, requiresPrivate ? [ ]
, conflicts ? [ ]
, cflags ? [ ]
, libs ? [ ]
, libsPrivate ? [ ]
, variables ? { }
}:
let
# only 'out' has to be changed, otherwise it would be replaced by the out of the writeTextFile
placeholderToSubstVar = builtins.replaceStrings [ "${placeholder "out"}" ] [ "@out@" ];
replacePlaceholderAndListToString = x:
if builtins.isList x
then placeholderToSubstVar (builtins.concatStringsSep " " x)
else placeholderToSubstVar x;
keywordsSection =
let
mustBeAList = attr: attrName: lib.throwIfNot (lib.isList attr) "'${attrName}' must be a list" attr;
in
{
"Name" = name;
"Description" = description;
"URL" = url;
"Version" = version;
"Requires" = mustBeAList requires "requires";
"Requires.private" = mustBeAList requiresPrivate "requiresPrivate";
"Conflicts" = mustBeAList conflicts "conflicts";
"Cflags" = mustBeAList cflags "cflags";
"Libs" = mustBeAList libs "libs";
"Libs.private" = mustBeAList libsPrivate "libsPrivate";
};
renderVariable = name: value:
lib.optionalString (value != "" && value != [ ]) "${name}=${replacePlaceholderAndListToString value}";
renderKeyword = name: value:
lib.optionalString (value != "" && value != [ ]) "${name}: ${replacePlaceholderAndListToString value}";
renderSomething = renderFunc: attrs:
lib.pipe attrs [
(lib.mapAttrsToList renderFunc)
(builtins.filter (v: v != ""))
(builtins.concatStringsSep "\n")
(section: ''${section}
'')
];
variablesSectionRendered = renderSomething renderVariable variables;
keywordsSectionRendered = renderSomething renderKeyword keywordsSection;
content = [ variablesSectionRendered keywordsSectionRendered ];
in
writeTextFile {
name = "${name}.pc";
destination = "/lib/pkgconfig/${name}.pc";
text = builtins.concatStringsSep "\n" content;
checkPhase = ''${buildPackages.pkg-config}/bin/${buildPackages.pkg-config.targetPrefix}pkg-config --validate "$target"'';
}
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