34 lines
1 KiB
Nix
34 lines
1 KiB
Nix
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{ lib }:
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{ /* Automatically convert an attribute set to command-line options.
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This helps protect against malformed command lines and also to reduce
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boilerplate related to command-line construction for simple use cases.
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Example:
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renderOptions { foo = "A"; bar = 1; baz = null; qux = true; v = true; }
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=> " --bar '1' --foo 'A' --qux -v"
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*/
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renderOptions =
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options:
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let
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render = key: value:
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let
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hyphenate =
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k: if builtins.stringLength k == 1 then "-${k}" else "--${k}";
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renderOption = v: if v == null then "" else " ${hyphenate key} ${lib.escapeShellArg v}";
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renderSwitch = if value then " ${hyphenate key}" else "";
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in
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if builtins.isBool value
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then renderSwitch
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else if builtins.isList value
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then lib.concatMapStrings renderOption value
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else renderOption value;
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in
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lib.concatStrings (lib.mapAttrsToList render options);
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}
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