29 lines
1.1 KiB
Nix
29 lines
1.1 KiB
Nix
{ lib, ... }:
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let
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# replaces " and \ to \" and \\ respectively and quote with "
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# e.g.
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# a"b\c -> "a\"b\\c"
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# a\"bc -> "a\\\"bc"
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escapeExeclineArg = arg:
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''"${builtins.replaceStrings [ ''"'' ''\'' ] [ ''\"'' ''\\'' ] (toString arg)}"'';
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# Escapes an execline (list of execline strings) to be passed to execlineb
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# Give it a nested list of strings. Nested lists are interpolated as execline
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# blocks ({}).
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# Everything is quoted correctly.
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#
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# Example:
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# escapeExecline [ "if" [ "somecommand" ] "true" ]
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# == ''"if" { "somecommand" } "true"''
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escapeExecline = execlineList: lib.concatStringsSep " "
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(let
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go = arg:
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if builtins.isString arg then [(escapeExeclineArg arg)]
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else if builtins.isPath arg then [(escapeExeclineArg "${arg}")]
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else if lib.isDerivation arg then [(escapeExeclineArg arg)]
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else if builtins.isList arg then [ "{" ] ++ builtins.concatMap go arg ++ [ "}" ]
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else abort "escapeExecline can only hande nested lists of strings, was ${lib.generators.toPretty {} arg}";
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in builtins.concatMap go execlineList);
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in
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escapeExecline
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