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This is only rudimentary support as allowed by `NIX_GET_COMPLETIONS`. In the future, we could use complete’s `--wraps` argument to autocomplete arguments for programs after `nix shell -c`.
38 lines
1.6 KiB
Fish
38 lines
1.6 KiB
Fish
function _nix_complete
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# Get the current command up to a cursor.
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# - Behaves correctly even with pipes and nested in commands like env.
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# - TODO: Returns the command verbatim (does not interpolate variables).
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# That might not be optimal for arguments like -f.
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set -l nix_args (commandline --current-process --tokenize --cut-at-cursor)
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# --cut-at-cursor with --tokenize removes the current token so we need to add it separately.
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# https://github.com/fish-shell/fish-shell/issues/7375
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# Can be an empty string.
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set -l current_token (commandline --current-token --cut-at-cursor)
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# Nix wants the index of the argv item to complete but the $nix_args variable
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# also contains the program name (argv[0]) so we would need to subtract 1.
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# But the variable also misses the current token so it cancels out.
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set -l nix_arg_to_complete (count $nix_args)
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env NIX_GET_COMPLETIONS=$nix_arg_to_complete $nix_args $current_token
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end
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function _nix_accepts_files
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set -l response (_nix_complete)
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# First line is either filenames or no-filenames.
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test $response[1] = 'filenames'
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end
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function _nix
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set -l response (_nix_complete)
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# Skip the first line since it handled by _nix_accepts_files.
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# Tail lines each contain a command followed by a tab character and, optionally, a description.
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# This is also the format fish expects.
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string collect -- $response[2..-1]
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end
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# Disable file path completion if paths do not belong in the current context.
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complete --command nix --condition 'not _nix_accepts_files' --no-files
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complete --command nix --arguments '(_nix)'
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