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author | Alyssa Ross <hi@alyssa.is> | 2022-05-31 09:59:33 +0000 |
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committer | Alyssa Ross <hi@alyssa.is> | 2022-05-31 09:59:57 +0000 |
commit | 9ff36293d1e428cd7bf03e8d4b03611b6d361c28 (patch) | |
tree | 1ab51a42b868c55b83f6ccdb80371b9888739dd9 /lib/cli.nix | |
parent | 1c4fcd0d4b0541e674ee56ace1053e23e562cc80 (diff) | |
parent | ddc3c396a51918043bb0faa6f676abd9562be62c (diff) | |
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Last good Nixpkgs for Weston+nouveau? archive
I came this commit hash to terwiz[m] on IRC, who is trying to figure out what the last version of Spectrum that worked on their NUC with Nvidia graphics is.
Diffstat (limited to 'lib/cli.nix')
-rw-r--r-- | lib/cli.nix | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/lib/cli.nix b/lib/cli.nix new file mode 100644 index 00000000000..c96d4dbb043 --- /dev/null +++ b/lib/cli.nix @@ -0,0 +1,83 @@ +{ lib }: + +rec { + /* Automatically convert an attribute set to command-line options. + + This helps protect against malformed command lines and also to reduce + boilerplate related to command-line construction for simple use cases. + + `toGNUCommandLine` returns a list of nix strings. + `toGNUCommandLineShell` returns an escaped shell string. + + Example: + cli.toGNUCommandLine {} { + data = builtins.toJSON { id = 0; }; + X = "PUT"; + retry = 3; + retry-delay = null; + url = [ "https://example.com/foo" "https://example.com/bar" ]; + silent = false; + verbose = true; + } + => [ + "-X" "PUT" + "--data" "{\"id\":0}" + "--retry" "3" + "--url" "https://example.com/foo" + "--url" "https://example.com/bar" + "--verbose" + ] + + cli.toGNUCommandLineShell {} { + data = builtins.toJSON { id = 0; }; + X = "PUT"; + retry = 3; + retry-delay = null; + url = [ "https://example.com/foo" "https://example.com/bar" ]; + silent = false; + verbose = true; + } + => "'-X' 'PUT' '--data' '{\"id\":0}' '--retry' '3' '--url' 'https://example.com/foo' '--url' 'https://example.com/bar' '--verbose'"; + */ + toGNUCommandLineShell = + options: attrs: lib.escapeShellArgs (toGNUCommandLine options attrs); + + toGNUCommandLine = { + # how to string-format the option name; + # by default one character is a short option (`-`), + # more than one characters a long option (`--`). + mkOptionName ? + k: if builtins.stringLength k == 1 + then "-${k}" + else "--${k}", + + # how to format a boolean value to a command list; + # by default it’s a flag option + # (only the option name if true, left out completely if false). + mkBool ? k: v: lib.optional v (mkOptionName k), + + # how to format a list value to a command list; + # by default the option name is repeated for each value + # and `mkOption` is applied to the values themselves. + mkList ? k: v: lib.concatMap (mkOption k) v, + + # how to format any remaining value to a command list; + # on the toplevel, booleans and lists are handled by `mkBool` and `mkList`, + # though they can still appear as values of a list. + # By default, everything is printed verbatim and complex types + # are forbidden (lists, attrsets, functions). `null` values are omitted. + mkOption ? + k: v: if v == null + then [] + else [ (mkOptionName k) (lib.generators.mkValueStringDefault {} v) ] + }: + options: + let + render = k: v: + if builtins.isBool v then mkBool k v + else if builtins.isList v then mkList k v + else mkOption k v; + + in + builtins.concatLists (lib.mapAttrsToList render options); +} |