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#!/bin/bash
readonly THEME_PKG_OR_DIR=$1 # or stdin?
readonly GRUB_DIR=/boot/grub
readonly THEMES_DIR=$GRUB_DIR/themes
readonly THEME_FILENAME='theme.txt'
readonly SYMLINK_NAME='parabola-laf'
readonly GRUB_DEF_FILE=/etc/default/grub
readonly GRUB_CONFIG_FILE=$GRUB_DIR/grub.cfg
readonly THEME_KVP="GRUB_THEME=$THEMES_DIR/$SYMLINK_NAME/$THEME_FILENAME"
SwtichTheme() # (theme_dirname)
{
local theme_dirname=$1
local theme_file=$THEMES_DIR/$theme_dirname/$THEME_FILENAME
[ -f "$theme_file" ] || return
ln -fs $THEMES_DIR/$theme_dirname $THEMES_DIR/$SYMLINK_NAME
[ "$(grep '^GRUB_THEME=' $GRUB_DEF_FILE | tail -n 1)" != "$THEME_KVP" ] || return
# sed 's|\s*#*\s*GRUB_THEME\s*=.*|'$THEME_KVP'|g' /etc/default/grub
echo $THEME_KVP >> $GRUB_DEF_FILE
grub-mkconfig -o $GRUB_CONFIG_FILE
}
case $THEME_PKG_OR_DIR in
'breeze-grub' ) SwtichTheme 'breeze' ;;
'deepin-grub2-themes' ) SwtichTheme 'deepin' ;;
'grub2-theme-gnuaxiom') SwtichTheme 'GNUAxiom' ;;
'parabola-laf' ) SwtichTheme 'GNUAxiom' ;;
* ) SwtichTheme $THEME_PKG_OR_DIR ;;
esac
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