i3-exec

#!/bin/sh -ue
# i3-exec COMMAND [ARG]..
#
# Tell i3 to start a command.  The environment and other process state is inherited from i3, not i3-exec.
#
# The command is *not* a shell command, and thus redirections, globs, or other shell features will not work.  If you want that, run "i3-msg exec".  If you want your head to explode instead, run "i3-exec sh -c 'command'".
#
# Options:
#     --startup-id                command uses $DESKTOP_STARTUP_ID

fatal() {
    printf %s\\n "$(basename "$0"): $2" >&2
    exit $1
}

startup_id=--no-startup-id
handle_option() {
    case "$1" in
        startup-id) [ $# = 1 ] || fatal 64 "unexpected --$1 value"
            startup_id= ;;
        no-startup-id) [ $# = 1 ] || fatal 64 "unexpected --$1 value"
            startup_id=--no-startup-id ;;
        *) fatal 64 "unknown option: $1" ;;
    esac
}
while [ $# -gt 0 ]; do
    case "$1" in
        --)
            shift
            break;;
        --*=*)
            x="${1#--}"
            handle_option "${x%%=*}" "${x#*=}"
            shift;;
        --*)
            handle_option "${1#--}"
            shift;;
        -?*)
            if [ ${#1} = 2 ]; then
                handle_option "${1#-}"
            else
                v="${1#??}"
                x="${1%"$v"}"
                handle_option "${x#-}" "$v"
            fi
            shift;;
        *)
            break;;
    esac
done

if [ $# = 0 ]; then
    fatal 64 'missing command'
fi

i3_exec_quote() {
    # for sh, wrap in single quotes with escaped existing single quote
    # for i3, escape double quotes
    printf %s "$1"x | sed "s/'/'\\\\''/g; 1s/^/'/; \$s/x\$/'/; s/\"/\\\\\"/g"
}

cmd=exec
for arg; do
    cmd="$cmd $(i3_exec_quote "$arg")"
done

exec i3-msg -q "exec $startup_id \"cd $(i3_exec_quote "$PWD") && $cmd\""