Ghost

A Zellij plugin for spawning floating command terminal pane. Basically, it is an interactive version of zrf (function zrf () { zellij run --name "$*" --floating -- zsh -ic "$*";}).

Since v0.3.0, if you define a list of completions from global_completion plugin configuration, it will load each lines as a list of commands that you can fuzzy search (using fuzzy-matcher).

If the plugin finds a .ghost at the working dir of the plugin, it will add the working dir completions with the global_completions.

Requirements

Zellij version v0.40.0 or later.

Zellij Plugin Permission

Permission	Why
ReadApplicationState	Subscribe to Pane and tab events
RunCommands	Creating Run Command floating pane
ChangeApplicationState	Setting plugin pane name

Host Filesystem Access

NOTE: zellij v0.39.0 changed the /host path on plugin from the current zellij session working dir to the previous pane working dir (see Release Notes for more info)

Zellij maps the folder where Zellij was started to /host path on the plugin.

The plugin will look for a /host/.ghost file (i.e. the current working of the previous focussed pane) to load a list of predefined commands (like a bash_history).

Example of a .ghost file:

cargo build
## this is a comment starting with '#'
	# this is also a comment
terraform apply



## empty lines are also ignored
go test -v ./...

Install

Upgrade

Breaking Change

v0.4.0

• renamed config cwd with exec_cwd

Download WASM Binary

• Download ghost.wasm binary from release page.
• Verify binary signature with cosign (see instruction bellow)
• copy binary to zellij plugin dir:
  • mv target/wasm32-wasi/release/ghost.wasm ~/.config/zellij/plugins/

Validate Signature With Cosign

Make sure you have cosign installed locally (see Cosign Install).

Then you can use the ./verify_signature.sh in this repo:

./verify_signature.sh PATH_TO_DOWNLOADED_ARCHIVE TAG_VERSION

for example

$ ./verify_signature.sh ~/Downloads/ghost.wasm v0.4.0

Checking Signature for version: v0.4.0
Verified OK

Build from source

WARNING: requires to have rust installed and wasm rustup target add wasm32-wasi

• git clone git@github.com:vdbulcke/ghost.git
• cd ghost
• cargo build --release
• mv target/wasm32-wasi/release/ghost.wasm ~/.config/zellij/plugins/

Configuration

Required Configuration

Zsh Shell

Key	value
shell	zsh
shell_flag	-ic

fish Shell

Key	value
shell	fish
shell_flag	-c

Bash Shell

Key	value
shell	bash
shell_flag	-ic

Optional Configuration

Key	value	desctiption
cwd (deprecated use exec_cwd instead)	directory path	set working dir for command
exec_cwd (zellij 0.40.0)	directory path	set working dir for command
embedded	true	created command panes are embedded instead of floating
ghost_launcher	GhostLauncher pane name	plugin will automatically close that pane
debug	true	display debug info
global_completion	multine list of completion	global list of completion to inlude to /host/.ghost file

Launch Plugin

zellij plugin --floating --configuration "shell=zsh,shell_flag=-ic,cwd=$(pwd)" -- "file:$HOME/.config/zellij/plugins/ghost.wasm"

Config Keybindings

NOTE: The LaunchOrFocusPlugin keybing action does not allow to dynamically pass the cwd to the plugin. As a workaround, you can use the Run keybinding action to execute the zellij plugin from a RunCommand pane where you can pass the plugin config exec_cwd=$(pwd). The cwd should be the same as the previously focused pane.

shared_except "locked" {

    // ghost native plugin (with default zellij cwd)
    bind "Alt (" {
        LaunchOrFocusPlugin "file:~/.config/zellij/plugins/ghost.wasm" {
            floating true

            // Ghost config 
            shell "zsh"      // required ("bash", "fish", "zsh")
            shell_flag "-ic" // required ("-ic",  "-c",    "-ic")

            // optional config
            // ghost_launcher "GhostLauncher" // name of the Ghost launcher pane (default GhostLauncher)
            // debug false                    // display debug info, config, parse command etc
            // embedded false                 // spawned command pane will be embedded instead of floating pane


            // NOTE: using 'r#"' and '"#' rust like multi string delimeter
            global_completion r#"
                tf apply -auto-approve
                cargo build
                go test -v  ./...
                
            "#
        }
    }

    // using GhostLauncher "hack" to pass the cwd=$(pwd) as runtime config 
    bind "Alt )" {
         // NOTE: you can pass the global_completion as runtim config with the '\n' delimiter between commands
         Run "bash" "-ic" "zellij  plugin --floating --configuration \"shell=zsh,shell_flag=-ic,exec_cwd=$(pwd),ghost_launcher=GhostLauncher,debug=false,global_completion=tf apply -auto-approve \ncargo build \ngo test -v  ./...\" -- \"file:$HOME/.config/zellij/plugins/ghost.wasm\"" {
            floating true
            name "GhostLauncher" // this must match ghost_launcher=GhostLauncher 
                                 // the plugin will automatically close the pane
                                 // with title "GhostLauncher"
        }
    }
}

Limitations

resizing

UI column size is not handled, so resizing to plugin window too small may crash the plugin. UI row size is partiallt handled, where it will minimize to a simple prompt if the plugin window becomes too small.

Note

This my first rust project, so the code might not be the most idiomatic rust. Inpiration was taken from other zellij plugins.