dotfiles/scripts/.local/bin/dimswitch

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#!/usr/bin/env bash
#
#==============================================================================
# FILE: dimswitch
# USAGE: dimswitch [-v] [-h] [-i [application]] [-t theme name] dark/light
#
# DESCRIPTION:
# Toggle alacritty terminal, and between dark
# or light mode (if correctly set up in the alacritty.yml file), see REQUIREMENTS
# The default action is to toggle between light and dark mode.
#
# OPTIONS: see function usage below
#
# REQUIREMENTS:
# The alacritty.yml file needs to have the various color-schemes set up as yaml
# anchors. The script itself will then switch the referenced anchor in the actual
# `color` key of the file. For an example alacritty.yml refer to its wiki, or
# this file: https://gitlab.com/marty-oehme/dotfiles/blob/master/.config/alacritty/alacritty.yml
#
# NOTES: This script is in active development and its functionality and options
# are very much undergoing changes. For now, do not rely on its options
# staying stable.
#
# AUTHOR:
# Marty Oehme
#
# VERSION:
ld_version="0.1.1"
#==============================================================================
#=== environment variables ====================================================
# DESCRIPTION: Environment variables to configure the script
#==============================================================================
# Sets the programs to be dimmed
if [ -z "$DIM_PROGRAMS" ]; then DIM_PROGRAMS=(alacritty); fi
# Sets the path(s) to the alacritty configuration file
if [ -z "$DIM_ALACRITTY_CONF" ]; then DIM_ALACRITTY_CONF="$HOME/.config/alacritty/alacritty.yml:$HOME/.alacritty.yml"; fi
#=== main function ============================================================
# NAME: main
# DESCRIPTION: Display usage information for this script.
# PARAMETERS: see usage function
#==============================================================================
main() {
local cmd=""
local ret=0
case "$1" in
-v | --version)
cmd="version"
;;
-h | --help)
cmd="usage"
;;
-i | --info)
cmd="printinfo"
;;
"")
cmd="toggle"
;;
esac
shift
$cmd "$@"
ret=$((ret + $?))
exit $ret
}
#=== usage function ===========================================================
# NAME: usage
# DESCRIPTION: Display usage information for this script.
#==============================================================================
usage() {
local name
name=$(basename "$0")
cat <<EOF
$name is a command line tool to toggle alacritty terminal themes.
Usage:
$name # Toggle theme between dark and light mode
$name # Set to specified alacritty theme
$name -i | --info # Print out programs to be dimmed
$name -h | --help # Print this usage information
$name -v | --version # Print version information
EOF
}
#=== theme info function=======================================================
# NAME: printinfo
# DESCRIPTION: Displays the programs to be dimmed, and the path to their
# configuration files. Currently only alacritty is implemented.
#==============================================================================
printinfo() {
for prog in "${DIM_PROGRAMS[@]}"; do
local file
file=$(getConfFile "$prog")
if [ -z "$file" ]; then
file="No associated configuration file found."
fi
echo "$prog" "-" "$file"
done
}
#=== toggle dimming function===================================================
# NAME: toggle
# DESCRIPTION: Toggles between dark and light mode in alacritty.
#==============================================================================
toggle() {
local file
file=$(getConfFile "alacritty")
if [ -z "$file" ]; then
exit 1
fi
local line
line=$(_findline "$file")
if [ -z "$line" ]; then exit 1; fi
if [[ -n $(_isdark "$file" "$line") ]]; then
_replace "$line" "$file" dark light
exit 0
fi
if [[ -n $(_islight "$file" "$line") ]]; then
_replace "$line" "$file" light dark
exit 0
fi
echo "Did not find a light/dark theme to toggle in alacritty."
exit 1
}
#=== version function==========================================================
# NAME: version
# DESCRIPTION: Display the current version of the script.
#==============================================================================
version() {
local name
name=$(basename "$0")
cat <<EOF
$name $ld_version
EOF
}
#=== get program's config file function =======================================
# NAME: getConfFile
# DESCRIPTION: Return the configuration file of the selected program.
# PARAMETER 1: [String] Name of Program
#==============================================================================
getConfFile() {
local conf
case $1 in
alacritty)
conf=$(_findfile "$DIM_ALACRITTY_CONF")
;;
esac
echo "$conf"
}
#=== verify file exists function ==============================================
# NAME: _findfile
# DESCRIPTION: Splits the string passed in into an array of paths and finds
# the first existing file. Return nothing if no file found.
# PARAMETER 1: [String] of paths, delimited by ":"
#==============================================================================
_findfile() {
IFS=':' read -ra paths <<<"$1"
for i in "${paths[@]}"; do
if [ -f "$i" ]; then
echo "$i"
fi
done
}
# function signature: _findline FILE
_findline() {
sed -n '/^colors: .*$/=' "$1"
}
# function signature: _islight LINENUMBER FILE
_islight() {
sed -n "$2p" "$1" | grep -e "-light$"
}
# function signature: _isdark LINENUMBER FILE
_isdark() {
sed -n "$2p" "$1" | grep -e "-dark$"
}
# function signature: _replace LINENUMBER FILE OLD NEW
_replace() {
sed -i "$1 s/-$3$/-$4/" "$2"
}
main "$@"