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Merge pull request #525 from lulivi/master
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Added dunst xresources theme wrapper
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@tsipinakis
tsipinakis committed Jul 15, 2018
2 parents c0eef2d + cbfe8c0 commit 0e1b5a1
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#!/usr/bin/env bash
###############################################################################
##
## Usage
##
## ./<script_name> [<OPTIONS>]
##
## If it does not run, give execute permissions to the script with
## chmod +x <script_name>. Then run ./<script_name>.
##
## Options
##
## -h|--help Optional. Show help message.
##
## Description
##
## This script creates a dunst themed user config in $HOME/.config/dunst/
## folder, changing dunst basic theming options (like fonts, colors, etc.)
## according to your current X resources color palette.
##
## To make this possible, it reads your current user config
## ($HOME/.conf/dunst/dunstrc, which is copied from the default config if
## it does not exist) and changes the attributes values with new ones (see
## Theming section for more info). Then it dumps the new configuration to
## $user_xr_color_conf file.
##
## Theming
##
## To change colors and fonts:
##
## * Firstly you have to ensure that those dunst attributes are defined in
## the corresponding sections. For example, to change the frame_color
## value from the global section, in $HOME/.config/dunst/dunstrc should
## be:
##
## ...
## [global]
## ...
## frame_color = <value>
## ...
##
## * Then, you can change attribute values as you wish with the
## following format in theme_attr_dict:
##
## ["<sec>-<attr>"]="<val>|$(xrdb_get '<X_res>' '<dev_val>')"
##
## Each <variable> means the following:
##
## * sec - current section name e.g.: global.
## * attr - current attribute name e.g.: frame-color.
## * val - a simple value e.g.: "#fffeee", Monospace, 11...
## * X_res - X resource name e.g.: color8.
## * dev_val - default value to set if X_res is not found e.g.: #65737e.
##
## Theming example (you can check theme_attr_dict for other values):
##
## ["global-frame_color"]="\"$(xrdb_get 'color8' '#65737e')
##
## The function xrdb_get, searches the first parameter in the X resources
## database with appres (command installed from xorg-appres in archlinux
## and x11-utils in ubuntu). If the first parameter does not exist, the
## function returns the second parameter. For hex colors, is important to
## scape " characters for proper functioning of dunst config reader (for
## example "#ffeegg").
##
## You can define X_res variables in $HOME/.Xresources file. For in depth
## syntax go to https://wiki.archlinux.org/index.php/X_resources.
##
###############################################################################

set -e

# Check if appres is installed
if [ ! "$(command -v appres)" ]; then
printf 'Install xorg-appres in archlinux and x11-utils in debian/ubuntu.\n'
exit 1
fi

readonly script_name="$(basename "$0")"
readonly base_dir="$(realpath "$(dirname "$0")")"

# Show ussage
usage() {
grep -e '^##[^#]*$' "$base_dir/$script_name" | \
sed -e "s/^##[[:space:]]\{0,1\}//g" \
-e "s/<script_name>/${script_name}/g"
exit 2
} 2>/dev/null

# Show help
if [ "$#" -gt 0 ]; then
if ! [[ "$1" == "--help" || "$1" == "-h" ]]; then
printf '\nUnknown option.\n'
fi
usage
fi

# Function to get resource values
xrdb_get () {
output="$(appres Dunst | grep "$1:" | head -n1 | cut -f2)"
default="$2"
printf '%s' "${output:-$default}"
}

#
# Attributes dictionary. Add or remove attributes (see header for more info)
#
declare -A theme_attr_dict=(
["global-font"]="$(xrdb_get 'font' 'Monospace') $(xrdb_get '*.font_size:' '11')"
["global-frame_width"]="$(xrdb_get 'border_width' '1')"
["global-frame_color"]="\"$(xrdb_get 'color8' '#65737e')\""

["urgency_low-background"]="\"$(xrdb_get 'color0' '#2b303b')\""
["urgency_low-foreground"]="\"$(xrdb_get 'color4' '#65737e')\""
["urgency_low-frame_color"]="\"$(xrdb_get 'color4' '#65737e')\""

["urgency_normal-background"]="\"$(xrdb_get 'color0' '#2b303b')\""
["urgency_normal-foreground"]="\"$(xrdb_get 'color2' '#a3be8c')\""
["urgency_normal-frame_color"]="\"$(xrdb_get 'color2' '#a3be8c')\""

["urgency_critical-background"]="\"$(xrdb_get 'color0' '#2b303b')\""
["urgency_critical-foreground"]="\"$(xrdb_get 'color1' '#bf616a')\""
["urgency_critical-frame_color"]="\"$(xrdb_get 'color1' '#bf616a')\""
)

# Attributes dictionary keys.
readonly valid_keys="${!theme_attr_dict[@]}"

#
# File paths
#
# User config dir and file
readonly user_conf_dir="${XDG_CONFIG_HOME:-$HOME/.config}/dunst"
readonly user_conf="$user_conf_dir/dunstrc"

# Default config dir and example file
example_conf_dir="/usr/share/dunst"
example_conf="$example_conf_dir/dunstrc"

# User xresources color config file
readonly user_xr_color_conf="$user_conf_dir/dunstrc_xr_colors"


# Check if the user config directory exists
if ! [ -d "$user_conf_dir" ]; then
printf 'Creating folder "%s".\n' "$user_conf_dir"
mkdir -p "$user_conf_dir"
fi

# Check if the user config file exists
if ! [ -f "$user_conf" ]; then
printf '"%s" file does not exist.\nChecking for config file example.' \
"$user_conf"

if [ -d "/usr/share/dunst" ]; then
# Archlinux default dir and example file
example_conf_dir="/usr/share/dunst"

if [ -f "$example_conf_dir/dunstrc" ]; then
example_conf="$example_conf_dir/dunstrc"
else
printf 'Could not find the example config file in "%s".
\nPlease, change $example_conf variable in the script.' \
"$example_conf_dir"
exit 1
fi

elif [ -d "/usr/share/doc/dunst" ]; then
# Debian/Ubuntu default dir
example_conf_dir="/usr/share/doc/dunst"

if [ -f "$example_conf_dir/dunstrc.example.gz" ]; then
# Ubuntu <= 17.10 and Debian <= 1.2.0-2 example file:
example_conf="$example_conf_dir/dunstrc.example.gz"
elif [ -f "$example_conf_dir/dunstrc.gz" ]; then
# Ubuntu >= 18.04 and Debian >= 1.3.0-2 example file:
example_conf="$example_conf_dir/dunstrc.gz"
else
printf 'Could not find the example config file in "%s".
\nPlease, change $example_conf variable in the script.' \
"$example_conf_dir"
exit 1
fi

else
printf 'Could not find the example config directory.
\nPlease, change $example_conf_dir variable in the script.'
exit 1
fi

printf 'Copying example config to "%s".\n' "$user_conf_dir"

# Get the extension to check if the file is compressed
if [[ "${example_conf##*\.}" == "gz" ]]; then
# Extract example file to user config file
gunzip -c "$example_conf" > "$user_conf"
else
cp "$example_conf" "$user_conf_dir"
fi

fi

# Regular expressions
readonly re_section_line='^\[(.*)\]$'
readonly re_empty_comment_line='(^$)|(^[[:space:]]*(\#)|(;))'
readonly re_attribute_line='^([[:space:]]*)([_[:alnum:]]+)'

# Create an array with the file lines
mapfile -t conf < "$user_conf"

# Iterate over the file lines
for idx in "${!conf[@]}"; do
# Current line
curr_line="${conf[$idx]}"
# If we are in a new section:
if [[ "$curr_line" =~ $re_section_line ]]; then
curr_section="${BASH_REMATCH[1]}"
continue
fi
# Skip the line if it is empty or has a comment
if [[ "$curr_line" =~ $re_empty_comment_line ]]; then
continue
fi
# Get the attribute in the current line
[[ "$curr_line" =~ $re_attribute_line ]]
curr_attr_name="${BASH_REMATCH[2]}"
curr_sett_name="${curr_section}-${curr_attr_name}"
# If the current attribute is not in our dictionary, continue
case "$valid_keys" in
*"$curr_sett_name"*)
printf -v conf[$idx] ' %s = %s' \
"${curr_attr_name}" \
"${theme_attr_dict[$curr_sett_name]}"
;;
esac
done

# Create a header for the xr_color config file
user_xr_color_conf_content="\
###################################
#
# Config file created with
# $script_name wrapper
#
###################################
"

# After everything is completed, write the new config to a file
user_xr_color_conf_content+="$(printf '%s\n' "${conf[@]}")"

printf '%s\n' "$user_xr_color_conf_content" > "$user_xr_color_conf"

printf '"%s" updated successfully.\n' "$user_xr_color_conf"

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