forked from lix-project/lix
alois31
82aa1ccab4
When generating shell completions, no logging output should be visible because it would destroy the shell prompt. Originally this was attempted to be done by simply disabling the progress bar (ca946860ce), since the situation is particularly bad there (the screen clearing required for the rendering ends up erasing the shell prompt). Due to overlooking the implementation of this hack, it was accidentally undone during a later change (0dd1d8ca1c). Since even with the hack correctly in place, it is still possible to mess up the prompt by logging output (for example warnings for disabled experimental features, or messages generated by `builtins.trace`), simply send it to the bit bucket where it belongs. This was already done for bash and zsh (9d840758a8), and it seems that fish was simply missed at that time. The last trace of the no-longer-working and obsolete hack is deleted too. Fixes: lix-project/lix#513 Change-Id:I59f1ebf90903034e2059298fa8d76bf970bc3315
37 lines
1.5 KiB
Fish
37 lines
1.5 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 2>/dev/null
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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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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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