fifc 🐠

fish fzf completions

fifc brings fzf powers on top of fish completion engine and allows customizable completion rules

✅ Requirements

• fish 3.4.0+

✨ Features

• Preview/open any file: text, image, gif, pdf, archive, binary (using external tools)
• Preview/open command's man page
• Preview/open function definitions
• Preview/open full option description when completing commands
• Recursively search for files and folders when completing paths (using fd)
• Preview directory content
• Preview process trees (using procs)
• Modular: easily add your own completion rules
• Properly handle paths with spaces (needs fish 3.4+)

🚀 Install

fisher install gazorby/fifc

🔧 Usage

You only need to set one setting after install:

set -Ux fifc_editor <your-favorite-editor>

And enjoy built-in completions!

By default fifc override tab, but you can assign another keybinding:

# Bind fzf completions to ctrl-x
set -U fifc_keybinding \cx

fifc can use modern tools if available:

Prefer	Fallback to	Used for	Custom options
bat	cat	Preview files	$fifc_bat_opts
chafa	file	Preview images, gif, pdf etc	$fifc_chafa_opts
hexyl	file	Preview binaries	$fifc_hexyl_opts
fd	find	Complete paths	$fifc_fd_opts
exa	ls	Preview directories	$fifc_exa_opts
ripgrep	pcregrep	Search options in man pages	-
procs	ps	Complete processes and preview their tree	$fifc_procs_opts
broot	-	Explore directory trees	$fifc_broot_opts

Custom options can be added for any of the commands used by fifc using the variable mentioned in the above table.

Example:

Show line number when previewing files:

• set -U fifc_bat_opts --style=numbers

Show hidden file by default:

• set -U fifc_fd_opts --hidden

⚠️ Don't use quotes in variables, set them as a list: set -U fifc_exa_opts --icons --tree

🛠️ Write your own rules

Custom rules can easily be added using the fifc command. Actually, all builtin rules are added this way: see conf.d/fifc.fish

See fifc -h for more details.

Basically, a rule allows you to trigger some commands based on specific conditions.

A condition can be either:

• A regex that must match commandline before the cursor position
• An arbitrary command that must exit with a non-zero status

If conditions are met, you can bind custom commands:

• preview: Command used for fzf preview
• source: Command that feeds fzf input
• open: Command binded to fifc_open_keybinding (defaults to ctrl-o)

All commands have access to the following variable describing the completion context:

Variable	Description	Command availability
fifc_candidate	Currently selected item in fzf	all except source
fifc_commandline	Commandline part before the cursor position	all
fifc_token	Last token from the commandline	all
fifc_group	Group to which fish suggestions belong (possible values: directories, files, options or processes)	all
fifc_extracted	Extracted string from the currently selected item using the extracted regex, if any	all except source
fifc_query	fzf query. On source command, it is the initial fzf query (passed through --query option)	all

fifc_group values

fifc test completion items to set fifc_group with the following conditions:

Group	Condition
directories	All completion items are directories
files	Items can be either files or directories
options	All items match the following regex: \h+\-+\h*$
processes	All items match the following regex ^[0-9]+$ (list of PID)

Matching order

By default, fifc evaluate all rules in the order in which they have been defined and stops at the first where all conditions are met. It does this each time it has to resolve source, preview and open commands.

Take the following scenario:

# Rule 1
fifc -n 'test "$fifc_group" = files' -p 'bat $fifc_candidate'
# Rule 2
fifc -n 'string match "*.json" "$fifc_candidate"' -p 'bat -l json $fifc_candidate'

When completing path, $fifc_group will be set to "files" so the first rule will always be valid in that case, and the second one will never be reached.

Another example:

# Rule 1
fifc --condition 'test "$fifc_group" = files' --preview 'bat $fifc_candidate'
# Rule 2
fifc --condition 'test "$fifc_group" = files' --source 'fd . --color=always --hidden $HOME'

Here, even if both rules have the same conditions, they won't interfere because fifc has to resolve source commands before the preview commands, so order doesn't matter in this case.

Override builtin rules

If you want to write your own rule based on the same conditions as one of the built-in ones, you can use fifc --order option. It tells fifc to evaluate the rule in a predefined order, so you can set it to 1 to make sure it will be evaluated first.

When omitting the --order, the rule will be declared unordered and will be evaluated after all other ordered rules, and all other unordered rules defined before.

All built-in rules are unordered.

Examples

Here is how the built-in rule for file preview/open is implemented:

fifc \
    # If selected item is a file
    -n 'test -f "$fifc_candidate"' \
    # bind `_fifc_preview_file` to preview command
    -p _fifc_preview_file \
    # and `_fifc_preview_file` when pressing ctrl-o
    -o _fifc_open_file

Interactively search packages in archlinux:

fifc \
    -r '^(pacman|paru)(\\h*\\-S)?\\h+' \
    -s 'pacman --color=always -Ss "$fifc_token" | string match -r \'^[^\\h+].*\'' \
    -e '.*/(.*?)\\h.*' \
    -f "--query ''" \
    -p 'pacman -Si "$fifc_extracted"'

Search patterns in files and preview matches when commandline starts with **<pattern> (using ripgrep and batgrep):

fifc \
    -r '.*\*{2}.*' \
    -s 'rg --hidden -l --no-messages (string match -r -g \'.*\*{2}(.*)\' "$fifc_commandline")' \
    -p 'batgrep --color --paging=never (string match -r -g \'.*\*{2}(.*)\' "$fifc_commandline") "$fifc_candidate"' \
    -f "--query ''" \
    -o 'batgrep --color (string match -r -g \'.*\*{2}(.*)\' "$fifc_commandline") "$fifc_candidate" | less -R' \
    -O 1

❤️ Credits

Thanks PatrickF1 (and collaborators!), for the great fzf.fish plugin which inspired me for the command-based configuration, and from which I copied the ci workflow.

📝 License

MIT