81 lines
2.4 KiB
Nix
81 lines
2.4 KiB
Nix
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{ lib, runCommand, dasel }:
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let
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daselBin = lib.getExe dasel;
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inherit (lib)
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last
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optionalString
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types
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;
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in
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rec {
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# Creates a transformer function that writes input data to disk, transformed
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# by both the `input` and `output` arguments.
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#
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# Type: makeDataWriter :: input -> output -> nameOrPath -> data -> (any -> string) -> string -> string -> any -> derivation
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#
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# input :: T -> string: function that takes the nix data and returns a string
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# output :: string: script that takes the $inputFile and write the result into $out
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# nameOrPath :: string: if the name contains a / the files gets written to a sub-folder of $out. The derivation name is the basename of this argument.
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# data :: T: the data that will be converted.
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#
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# Example:
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# writeJSON = makeDataWriter { input = builtins.toJSON; output = "cp $inputPath $out"; };
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# myConfig = writeJSON "config.json" { hello = "world"; }
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#
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makeDataWriter = { input ? lib.id, output ? "cp $inputPath $out" }: nameOrPath: data:
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assert lib.or (types.path.check nameOrPath) (builtins.match "([0-9A-Za-z._])[0-9A-Za-z._-]*" nameOrPath != null);
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let
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name = last (builtins.split "/" nameOrPath);
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in
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runCommand name
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{
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input = input data;
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passAsFile = [ "input" ];
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} ''
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${output}
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${optionalString (types.path.check nameOrPath) ''
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mv $out tmp
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mkdir -p $out/$(dirname "${nameOrPath}")
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mv tmp $out/${nameOrPath}
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''}
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'';
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# Writes the content to text.
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#
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# Example:
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# writeText "filename.txt" "file content"
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writeText = makeDataWriter {
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input = toString;
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output = "cp $inputPath $out";
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};
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# Writes the content to a JSON file.
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#
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# Example:
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# writeJSON "data.json" { hello = "world"; }
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writeJSON = makeDataWriter {
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input = builtins.toJSON;
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output = "${daselBin} -f $inputPath -r json -w json > $out";
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};
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# Writes the content to a TOML file.
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#
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# Example:
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# writeTOML "data.toml" { hello = "world"; }
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writeTOML = makeDataWriter {
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input = builtins.toJSON;
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output = "${daselBin} -f $inputPath -r json -w toml > $out";
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};
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# Writes the content to a YAML file.
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#
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# Example:
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# writeYAML "data.yaml" { hello = "world"; }
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writeYAML = makeDataWriter {
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input = builtins.toJSON;
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output = "${daselBin} -f $inputPath -r json -w yaml > $out";
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};
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}
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