Run a standalone Magit editor!

magit.sh

#!/bin/bash

# Run a standalone Magit editor!  To improve startup speed, this
# script ignores the user's Emacs init files and only loads the Emacs
# libraries Magit requires.

# Note that this does NOT install any packages.  Magit and its
# dependencies must already be installed in ~/.emacs.d.

dependencies=(magit async dash with-editor git-commit transient)

function load_paths {
    # Echo the "-L PATH" arguments for Emacs.  Since multiple versions
    # of a package could be installed, and we want the latest one, we
    # sort them and take the top one.
    for package in "$@"
    do
        find ~/.emacs.d/elpa -maxdepth 1 -type d -iname "$package-2*" \
            | sort -r | head -n1 | \
            while read path
            do
                printf -- '-L %q ' "$path"
            done
    done
}

function usage {
    echo <<EOF
It's Magit!

Options:
  -h, --help  This.
  -x, --no-x  Display in terminal instead of in a GUI window.
EOF
}

# * Args

args=$(getopt -n "$0" -o x -l no-x -- "$@") || { usage; exit 1; }
eval set -- "$args"

while true
do
    case "$1" in
        -h|--help)
            usage
            exit
            ;;
        -x|--no-x)
            gui="-nw"
            ;;
        --)
            # Remaining args (required; do not remove)
            shift
            rest=("$@")
            break
            ;;
    esac

    shift
done

# * Main

emacs -q $gui \
      $(load_paths "${dependencies[@]}") \
      -l magit -f magit-status \
      --eval "(local-set-key \"q\" #'kill-emacs)" \
      -f delete-other-windows