shellfu-bash-saturnin/src/libexec/saturnin-kb

#!/bin/bash

. $(ffoom path)

ffoo import inigrep
ffoo import pretty


usage() {
    mkusage "[show]" \
            "next" \
            "home" \
            "layout LAYOUT"
}

next_layout() {
    #
    # change layout to the next one in row
    #
    local cur="$current_layout"
    local all="$(inigrep -p kb.layout)"
    local def="$default_layout"
    local nxt=$(
        echo -e "$all\n$all" \
          | grep -m 1 -A 1 $cur \
          | tail -1
    )
    test -z "$nxt" && nxt=$def
    test -z "$nxt" && nxt=us
    debug -v all def cur nxt
    echo "$nxt"
}

default_layout="$(inigrep -1 -p kb.layout)"
current_layout="$(setxkbmap -v | grep '^symbols: ' | cut -d+ -f2)"

layout=""
action=show
case "$1" in
    home)     action=set; layout="$default_layout" ;;
    next)     action=set; layout="$(next_layout)"  ;;
    layout)   action=set; layout="$2"              ;;
    ""|show)  true                                 ;;
    *)        usage                                ;;
esac


debug -v layout current_layout default_layout

case "$action" in
    show)
        echo "$current_layout"
        exit
        ;;
    set)
        test -n "$layout" || usage
        setxkbmap "$layout"
        ;;
esac