114 lines
3.3 KiB
Nix
114 lines
3.3 KiB
Nix
{ lib }:
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rec {
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/**
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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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`toGNUCommandLine` returns a list of nix strings.
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`toGNUCommandLineShell` returns an escaped shell string.
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# Inputs
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`options`
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: 1\. Function argument
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`attrs`
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: 2\. Function argument
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# Examples
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:::{.example}
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## `lib.cli.toGNUCommandLineShell` usage example
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```nix
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cli.toGNUCommandLine {} {
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data = builtins.toJSON { id = 0; };
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X = "PUT";
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retry = 3;
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retry-delay = null;
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url = [ "https://example.com/foo" "https://example.com/bar" ];
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silent = false;
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verbose = true;
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}
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=> [
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"-X" "PUT"
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"--data" "{\"id\":0}"
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"--retry" "3"
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"--url" "https://example.com/foo"
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"--url" "https://example.com/bar"
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"--verbose"
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]
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cli.toGNUCommandLineShell {} {
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data = builtins.toJSON { id = 0; };
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X = "PUT";
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retry = 3;
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retry-delay = null;
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url = [ "https://example.com/foo" "https://example.com/bar" ];
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silent = false;
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verbose = true;
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}
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=> "'-X' 'PUT' '--data' '{\"id\":0}' '--retry' '3' '--url' 'https://example.com/foo' '--url' 'https://example.com/bar' '--verbose'";
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```
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:::
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*/
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toGNUCommandLineShell =
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options: attrs: lib.escapeShellArgs (toGNUCommandLine options attrs);
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toGNUCommandLine = {
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# how to string-format the option name;
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# by default one character is a short option (`-`),
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# more than one characters a long option (`--`).
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mkOptionName ?
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k: if builtins.stringLength k == 1
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then "-${k}"
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else "--${k}",
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# how to format a boolean value to a command list;
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# by default it’s a flag option
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# (only the option name if true, left out completely if false).
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mkBool ? k: v: lib.optional v (mkOptionName k),
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# how to format a list value to a command list;
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# by default the option name is repeated for each value
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# and `mkOption` is applied to the values themselves.
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mkList ? k: v: lib.concatMap (mkOption k) v,
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# how to format any remaining value to a command list;
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# on the toplevel, booleans and lists are handled by `mkBool` and `mkList`,
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# though they can still appear as values of a list.
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# By default, everything is printed verbatim and complex types
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# are forbidden (lists, attrsets, functions). `null` values are omitted.
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mkOption ?
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k: v: if v == null
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then []
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else if optionValueSeparator == null then
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[ (mkOptionName k) (lib.generators.mkValueStringDefault {} v) ]
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else
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[ "${mkOptionName k}${optionValueSeparator}${lib.generators.mkValueStringDefault {} v}" ],
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# how to separate an option from its flag;
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# by default, there is no separator, so option `-c` and value `5`
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# would become ["-c" "5"].
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# This is useful if the command requires equals, for example, `-c=5`.
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optionValueSeparator ? null
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}:
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options:
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let
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render = k: v:
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if builtins.isBool v then mkBool k v
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else if builtins.isList v then mkList k v
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else mkOption k v;
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in
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builtins.concatLists (lib.mapAttrsToList render options);
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}
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