38 lines
1.3 KiB
Nix
38 lines
1.3 KiB
Nix
{ pkgs, depot, ... }:
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# Write an execline script, represented as nested nix lists.
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# Everything is escaped correctly.
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# https://skarnet.org/software/execline/
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# TODO(Profpatsch) upstream into nixpkgs
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name:
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{
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# "var": substitute readNArgs variables and start $@
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# from the (readNArgs+1)th argument
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# "var-full": substitute readNArgs variables and start $@ from $0
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# "env": don’t substitute, set # and 0…n environment vaariables, where n=$#
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# "none": don’t substitute or set any positional arguments
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# "env-no-push": like "env", but bypass the push-phase. Not recommended.
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argMode ? "var",
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# Number of arguments to be substituted as variables (passed to "var"/"-s" or "var-full"/"-S"
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readNArgs ? 0,
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}:
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# Nested list of lists of commands.
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# Inner lists are translated to execline blocks.
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argList:
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let
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env =
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if argMode == "var" then "s${toString readNArgs}"
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else if argMode == "var-full" then "S${toString readNArgs}"
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else if argMode == "env" then ""
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else if argMode == "none" then "P"
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else if argMode == "env-no-push" then "p"
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else abort ''"${toString argMode}" is not a valid argMode, use one of "var", "var-full", "env", "none", "env-no-push".'';
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in
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depot.nix.writeScript name ''
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#!${pkgs.execline}/bin/execlineb -W${env}
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${depot.nix.escapeExecline argList}
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''
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