Generic shell completion support for the 'nix' command #3587
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This completes flakerefs using the registry (e.g. 'nix<TAB>' => 'nix nixpkgs') and flake output attributes by evaluating the flake (e.g. 'dwarffs#nix<TAB>' => 'dwarffs#nixosModules').
macOS doesn't have GLOB_ONLYDIR.
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This adds completion support for the
nixcommand. For example:This is mostly shell-independent: the bash completion script just runs the
nixcommand with the environment variableNIX_GET_COMPLETIONSset.nixthen prints the completions on stdout. So it shouldn't be hard to enable support for other shells.Any flag / argument can get custom completion by setting a
completerfunction.