supershadoe · May 11, 2022 15:27 · supershadoe · Jan 11, 2022
diff --git a/reboot-menu.sh b/reboot-menu.sh
 #!/usr/bin/env sh
 # vim:sw=4:ts=4:sts=4:et

 # Reboot menu script
 # This script displays a list of boot entries registered in systemd-boot
 # Makes it easier to directly reboot to another OS (if dual or multi-booting)
 # Created by supershadoe <supershadoe5[at]gmail[dot]com>
 # (Skip to line 43 if you want to just see the code)

 # COPYRIGHT NOTICE
 # Copyright 2022 supershadoe
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.

 # IMPLEMENTATION DETAILS
 # set -e makes the script quit on any error
 # The data is just flown to other commands using pipes
 # Data is fetched from bootctl -> Processed through sed -> Provided to zenity
 # as arguments using xargs -> Output of zenity processed by xargs and provided
 # to systemctl

 # In sed, -n is used to prevent output of pattern space(the inputted data)
 # The first s// substitutes the whitespaces and `title: ` with `FALSE "` to
 #   keep the first row unselected in radiolist in zenity
 # The second s// adds a double quote at end to close the quotes
 #   Quotes were used because of boot entry names having spaces in them
 # The third s// substitutes the first occurance of FALSE with TRUE
 #   as I need the first option to be selected by default
 # p prints the edited pattern space
 # n changes the pattern space to the next line
 # The fourth s// removes the whitespaces and `id: `
 # Thus, in the end you get output in the form of `FALSE "entry name"\nentry-id\n`

 # ACTUAL CODE
 set -e
 bootctl list | grep "title\|id" | \
    sed -n "
        s/[ ]*title: /FALSE \"/
        s/$/\"/
        0,/FALSE/{s/FALSE/TRUE/}
        p
        n
        s/[ ]*id: //
        p" | \
    xargs zenity --list --radiolist \
        --window-icon \
            "/usr/share/icons/Adwaita/32x32/actions/system-reboot-symbolic.symbolic.png" \
        --height 300 \
        --width 500 \
        --text "Select the boot entry to reboot to." \
        --title "Reboot Menu" \
        --column "Choice" \
        --column "Boot Entry" \
        --column "UID" \
        --print-column 3 | \
    xargs -I "{}" systemctl reboot --boot-loader-entry={}