forked from mirrors/nixpkgs
26eb10e771
They both reference the toJSON builtin, so we get semantic identifiers that express the intent of the generation. Both should be able to map each nix value (minus functions) to the destination config files. Includes two invocation unit tests.
68 lines
2 KiB
Nix
68 lines
2 KiB
Nix
/* Functions that generate widespread config file
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* formats from nix data structures.
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* Tests can be found in ./tests.nix
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*/
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with import ./trivial.nix;
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let
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libStr = import ./strings.nix;
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libAttr = import ./attrsets.nix;
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flipMapAttrs = flip libAttr.mapAttrs;
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in
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rec {
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/* Generates an INI-style config file from an
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* attrset of sections to an attrset of key-value pairs.
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*
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* generators.toINI {} {
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* foo = { hi = "${pkgs.hello}"; ciao = "bar"; };
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* baz = { "also, integers" = 42; };
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* }
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*
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*> [baz]
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*> also, integers=42
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*>
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*> [foo]
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*> ciao=bar
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*> hi=/nix/store/y93qql1p5ggfnaqjjqhxcw0vqw95rlz0-hello-2.10
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*
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* The mk* configuration attributes can generically change
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* the way sections and key-value strings are generated.
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*
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* For more examples see the test cases in ./tests.nix.
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*/
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toINI = {
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# apply transformations (e.g. escapes) to section names
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mkSectionName ? (name: libStr.escape [ "[" "]" ] name),
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# format a setting line from key and value
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mkKeyValue ? (k: v: "${libStr.escape ["="] k}=${toString v}")
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}: attrsOfAttrs:
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let
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# map function to string for each key val
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mapAttrsToStringsSep = sep: mapFn: attrs:
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libStr.concatStringsSep sep
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(libAttr.mapAttrsToList mapFn attrs);
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mkLine = k: v: mkKeyValue k v + "\n";
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mkSection = sectName: sectValues: ''
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[${mkSectionName sectName}]
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'' + libStr.concatStrings (libAttr.mapAttrsToList mkLine sectValues);
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in
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# map input to ini sections
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mapAttrsToStringsSep "\n" mkSection attrsOfAttrs;
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/* Generates JSON from an arbitrary (non-function) value.
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* For more information see the documentation of the builtin.
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*/
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toJSON = {}: builtins.toJSON;
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/* YAML has been a strict superset of JSON since 1.2, so we
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* use toJSON. Before it only had a few differences referring
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* to implicit typing rules, so it should work with older
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* parsers as well.
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*/
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toYAML = {}@args: toJSON args;
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}
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