ea412cd5a1
generators for the common use case of simple config files which hold keys and values. Used in the implementation for toINI.
94 lines
2.6 KiB
Nix
94 lines
2.6 KiB
Nix
/* Functions that generate widespread file
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* formats from nix data structures.
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*
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* They all follow a similar interface:
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* generator { config-attrs } data
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*
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* Tests can be found in ./tests.nix
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* Documentation in the manual, #sec-generators
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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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/* Generate a line of key k and value v, separated by
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* character sep. If sep appears in k, it is escaped.
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* Helper for synaxes with different separators.
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*
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* mkKeyValueLine ":" "f:oo" "bar"
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* > "f\:oo:bar"
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*/
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mkKeyValueLine = sep: k: v:
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"${libStr.escape [sep] k}${sep}${toString v}";
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/* Generate a key-value-style config file from an attrset.
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*
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* mkKeyValue is the same as in toINI.
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*/
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toKeyValue = {
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mkKeyValue ? mkKeyValueLine "="
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}: attrs:
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let mkLine = k: v: mkKeyValue k v + "\n";
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in libStr.concatStrings (libAttr.mapAttrsToList mkLine attrs);
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/* Generate an INI-style config file from an
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* attrset of sections to an attrset of key-value pairs.
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*
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* generators.toINI {} {
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* foo = { hi = "${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 ? mkKeyValueLine "="
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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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mkSection = sectName: sectValues: ''
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[${mkSectionName sectName}]
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'' + toKeyValue { inherit mkKeyValue; } 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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