This package extends the pcomplete completion framework with completion from the
fish shell.
The fish shell has smart completion for a wide range of programs. fish does
not require any special configuration to work with this package.
Eshell, which uses pcomplete for completion, can be made to fall back on
fish when it does not find any completion candidate with its native completion
support.
M-x shell can be made to use fish. This will disable the underlying shell
completion.
To enable fish completion in all Eshell and M-x shell buffers, add this to
your Emacs configuration:
(when (and (executable-find "fish")
(require 'fish-completion nil t))
(global-fish-completion-mode))
The condition will prevent the package from loading if fish is not found
(change the executable name according to you local installation).
Alternatively, you can simply load the package with (require 'fish-completion)
and call fish-completion-mode manually.
Optionally, if the package
bash-completion is
installed, fish-completion-complete can be configured to fall back on bash to
further try completing. See fish-completion-fallback-on-bash-p.