nixpkgs/pkgs/build-support/writers/data.nix

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