diff options
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | misc/fish/completion.fish | 37 | ||||
| -rw-r--r-- | misc/fish/local.mk | 1 |
3 files changed, 39 insertions, 0 deletions
@@ -12,6 +12,7 @@ makefiles = \ src/resolve-system-dependencies/local.mk \ scripts/local.mk \ misc/bash/local.mk \ + misc/fish/local.mk \ misc/zsh/local.mk \ misc/systemd/local.mk \ misc/launchd/local.mk \ diff --git a/misc/fish/completion.fish b/misc/fish/completion.fish new file mode 100644 index 000000000..bedbefaf8 --- /dev/null +++ b/misc/fish/completion.fish @@ -0,0 +1,37 @@ +function _nix_complete + # Get the current command up to a cursor. + # - Behaves correctly even with pipes and nested in commands like env. + # - TODO: Returns the command verbatim (does not interpolate variables). + # That might not be optimal for arguments like -f. + set -l nix_args (commandline --current-process --tokenize --cut-at-cursor) + # --cut-at-cursor with --tokenize removes the current token so we need to add it separately. + # https://github.com/fish-shell/fish-shell/issues/7375 + # Can be an empty string. + set -l current_token (commandline --current-token --cut-at-cursor) + + # Nix wants the index of the argv item to complete but the $nix_args variable + # also contains the program name (argv[0]) so we would need to subtract 1. + # But the variable also misses the current token so it cancels out. + set -l nix_arg_to_complete (count $nix_args) + + env NIX_GET_COMPLETIONS=$nix_arg_to_complete $nix_args $current_token +end + +function _nix_accepts_files + set -l response (_nix_complete) + # First line is either filenames or no-filenames. + test $response[1] = 'filenames' +end + +function _nix + set -l response (_nix_complete) + # Skip the first line since it handled by _nix_accepts_files. + # Tail lines each contain a command followed by a tab character and, optionally, a description. + # This is also the format fish expects. + string collect -- $response[2..-1] +end + +# Disable file path completion if paths do not belong in the current context. +complete --command nix --condition 'not _nix_accepts_files' --no-files + +complete --command nix --arguments '(_nix)' diff --git a/misc/fish/local.mk b/misc/fish/local.mk new file mode 100644 index 000000000..ece899fc3 --- /dev/null +++ b/misc/fish/local.mk @@ -0,0 +1 @@ +$(eval $(call install-file-as, $(d)/completion.fish, $(datarootdir)/fish/vendor_completions.d/nix.fish, 0644)) |