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https://github.com/nix-community/home-manager
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66 lines
2.3 KiB
Nix
66 lines
2.3 KiB
Nix
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{ lib }: rec {
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mkNushellInline = expr: lib.setType "nushell-inline" { inherit expr; };
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toNushell = { indent ? "", multiline ? true, asBindings ? false }@args:
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v:
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let
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innerIndent = "${indent} ";
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introSpace = if multiline then ''
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${innerIndent}'' else
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" ";
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outroSpace = if multiline then ''
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${indent}'' else
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" ";
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innerArgs = args // {
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indent = if asBindings then indent else innerIndent;
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asBindings = false;
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};
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concatItems = lib.concatStringsSep introSpace;
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isNushellInline = lib.isType "nushell-inline";
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generatedBindings = assert lib.assertMsg (badVarNames == [ ])
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"Bad Nushell variable names: ${
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lib.generators.toPretty { } badVarNames
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}";
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lib.concatStrings (lib.mapAttrsToList (key: value: ''
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${indent}let ${key} = ${toNushell innerArgs value}
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'') v);
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isBadVarName = name:
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# Extracted from https://github.com/nushell/nushell/blob/ebc7b80c23f777f70c5053cca428226b3fe00d30/crates/nu-parser/src/parser.rs#L33
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# Variables with numeric or even empty names are allowed. The only requisite is not containing any of the following characters
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let invalidVariableCharacters = ".[({+-*^/=!<>&|";
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in lib.match "^[$]?[^${lib.escapeRegex invalidVariableCharacters}]+$"
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name == null;
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badVarNames = lib.filter isBadVarName (builtins.attrNames v);
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in if asBindings then
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generatedBindings
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else if v == null then
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"null"
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else if lib.isInt v || lib.isFloat v || lib.isString v || lib.isBool v then
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lib.strings.toJSON v
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else if lib.isList v then
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(if v == [ ] then
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"[]"
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else
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"[${introSpace}${
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concatItems (map (value: "${toNushell innerArgs value}") v)
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}${outroSpace}]")
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else if lib.isAttrs v then
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(if isNushellInline v then
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"(${v.expr})"
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else if v == { } then
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"{}"
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else if lib.isDerivation v then
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toString v
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else
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"{${introSpace}${
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concatItems (lib.mapAttrsToList (key: value:
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"${lib.strings.toJSON key}: ${toNushell innerArgs value}") v)
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}${outroSpace}}")
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else
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abort "nushell.toNushell: type ${lib.typeOf v} is unsupported";
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}
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