Replace tr with parameter expansion.

Use parameter splitting instead of splitting into array via grep. Speeds
the prompt upto 2x in some cases.

plugins/battery.sh

@@ -16,12 +16,17 @@ function wish_battery_set_colors() {
 
 function wish_battery_main() {
 	local path=/sys/class/power_supply/$WISH_BATTERY_ID
-	local battery=$(($(cat $path/charge_now) * 100 / $(cat $path/charge_full)))%
+	local battery
+	if [[ -f $path/charge_now ]]; then
+		battery=$(($(cat $path/charge_now) * 100 / $(cat $path/charge_full)))%
 		if [[ $(cat $path/status) == "Charging" ]] ||
 			[[ $(cat $path/status) == "Full" ]]; then
 			battery="$WISH_BATTERY_CHARGING $battery"
 		else
 			battery="$WISH_BATTERY_DISCHARGING $battery"
 		fi
+	else
+		battery="$WISH_BATTERY_ID not found"
+	fi
 	wish_append $WISH_BATTERY_BG $WISH_BATTERY_FG " $battery "
 }

themes/gradient.sh

@@ -6,8 +6,8 @@ local fg_gradient=(16 16 16 16 16 15 15)
 local j=0
 for i in ${WISH_PLUGINS[@]}; do
 	[[ $i == "newline" ]] && j=0 && continue
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_BG=${gradient[$j]}
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_FG=${fg_gradient[$j]}
+	eval WISH_${i^^}_BG=${gradient[$j]}
+	eval WISH_${i^^}_FG=${fg_gradient[$j]}
 	((j++))
 	if [[ $j -eq ${#gradient[@]} ]]; then
 		j=0

themes/lowfi-neon.sh

@@ -6,8 +6,8 @@ local gradient=(e7c547 c0e551 82e35a 62e177 6bdfb3 73d4dd 7aa6da)
 local j=0
 for i in ${WISH_PLUGINS[@]}; do
 	[[ $i == "newline" ]] && j=0 && continue
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_BG=-1
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_FG=${gradient[$j]}
+	eval WISH_${i^^}_BG=-1
+	eval WISH_${i^^}_FG=${gradient[$j]}
 	((j++))
 	if [[ $j -eq ${#gradient[@]} ]]; then
 		j=0

themes/plain.sh

@@ -2,6 +2,6 @@ WISH_DEFAULT_BG=-1
 WISH_DEFAULT_FG=-1
 WISH_POWERLINE=0
 for i in ${WISH_PLUGINS[@]}; do
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_BG=-1
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_FG=-1
+	eval WISH_${i^^}_BG=-1
+	eval WISH_${i^^}_FG=-1
 done

themes/rgb_gradient.sh

@@ -6,8 +6,8 @@ local fg_gradient=(000000 000000 000000 000000 000000 ffffff ffffff)
 local j=0
 for i in ${WISH_PLUGINS[@]}; do
 	[[ $i == "newline" ]] && j=0 && continue
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_BG=${gradient[$j]}
-	eval WISH_$(echo $i | tr '[:lower:]' '[:upper:]')_FG=${fg_gradient[$j]}
+	eval WISH_${i^^}_BG=${gradient[$j]}
+	eval WISH_${i^^}_FG=${fg_gradient[$j]}
 	((j++))
 	if [[ $j -eq ${#gradient[@]} ]]; then
 		j=0

wish.sh

@@ -2,60 +2,78 @@
 
 function wish_init() {
 	# Source all plugins
-	local i
-	local j
-	for i in ${WISH_PLUGINS[@]}; do
-		for j in "$XDG_CONFIG_HOME" "/usr/share" "$HOME/.config"; do
-			source "$j/wish/plugins/$i.sh" &> /dev/null && break
+	local plugin
+	local path
+	for plugin in ${WISH_PLUGINS[@]}; do
+		for path in "$XDG_CONFIG_HOME" "/usr/share" "$HOME/.config"; do
+			source "$path/wish/plugins/$plugin.sh" &> /dev/null && break
 		done
 		[[ $? -ne 0 ]] && echo "Plugin $i not found." >&2
 	done
 
 	# Source theme
 	WISH_THEME=${WISH_THEME:-plain}
-	for i in "$XDG_CONFIG_HOME" "/usr/share" "$HOME/.config"; do
-		source "$i/wish/themes/$WISH_THEME.sh" &> /dev/null && break
+	while :; do
+		for theme in "$XDG_CONFIG_HOME" "/usr/share" "$HOME/.config"; do
+			source "$theme/wish/themes/$WISH_THEME.sh" &> /dev/null && break
+		done
+		if [[ $? -eq 0 ]]; then
+			break
+		else
+			echo "Theme $WISH_THEME not found. Using theme plain." >&2
+			if [[ $WISH_THEME == "plain" ]]; then
+				break
+			else
+				WISH_THEME=plain
+			fi
+		fi
 	done
 
-	[[ $? -ne 0 ]] && echo "Theme $WISH_THEME not found." >&2
-
 	# Call plugins to set colors
-	for i in ${WISH_PLUGINS[@]}; do
-		eval wish_$(echo $i)_set_colors $prev
+	for plugin in ${WISH_PLUGINS[@]}; do
+		eval wish_$(echo $plugin)_set_colors $prev
 	done
 }
 
+# Usage: color_to_escape_code [3|4] color
+#
+# Parameters:
+# - [3|4]: Use 3 if escape code is for foreground, 4 for background
+# - color: -1 to reset, 0-255 for terminal color codes. 6 digit hexadecimal
+# value for true color.
+#
+# Return value: Prints escape code that sets the fg/bg as requested.
+function color_to_escape_code() {
+	local choice=$1
+	local color=$2
+	if [[ $color == -1 ]]; then
+		echo "\[\033[0;5;0m\]"
+	else
+		if [[ ${#fg_code} -eq 6 ]]; then
+			local r=$(( 16#${color:0:2} ))
+			local g=$(( 16#${color:2:2} ))
+			local b=$(( 16#${color:4:2} ))
+			echo "\[\033[${choice}8;2;$r;$g;${b}m\]"
+		else
+			echo "\[\033[${choice}8;5;${fg_code}m\]"
+		fi
+	fi
+}
+
 # Usage: wish_append bg fg text
+#
+# Parameters:
+# - fg, bg: -1 to reset, 0-255 for terminal color codes. 6 digit hexadecimal
+# value for true color.
+# - text: Text of the plugin
+#
+# Return value: None
 function wish_append() {
 	local bg_code=$1
 	local fg_code=$2
 	local text=$3
-	if [[ $fg_code == -1 ]]; then
-		local fg="\[\033[0;5;0m\]"
-	else
-		if [[ ${#fg_code} -eq 6 ]]; then
-			local color=($(echo $fg_code | grep -o .))
-			local r=$(( 16#${color[0]}${color[1]} ))
-			local g=$(( 16#${color[2]}${color[3]} ))
-			local b=$(( 16#${color[4]}${color[5]} ))
-			local fg="\[\033[38;2;$r;$g;${b}m\]"
-		else
-			local fg="\[\033[38;5;${fg_code}m\]"
-		fi
-	fi
-	if [[ $bg_code == -1 ]]; then
-		local bg="\[\033[0;5;0m\]"
-	else
-		if [[ ${#bg_code} -eq 6 ]]; then
-			local color=($(echo $bg_code | grep -o .))
-			local r=$(( 16#${color[0]}${color[1]} ))
-			local g=$(( 16#${color[2]}${color[3]} ))
-			local b=$(( 16#${color[4]}${color[5]} ))
-			local bg="\[\033[48;2;$r;$g;${b}m\]"
-		else
-			local bg="\[\033[48;5;${bg_code}m\]"
-		fi
-	fi
+	local fg=$(color_to_escape_code 3 $fg_code)
+	local bg=$(color_to_escape_code 4 $bg_code)
 
 	if [[ $fg_code == -1 ]]; then
 		PS1="$PS1$fg${bg}$text"
@@ -83,17 +101,14 @@ function wish_main() {
 					if wish_${WISH_PLUGINS[$(($i + 1))]}_start $prev; then
 						local plugin=${WISH_PLUGINS[$i]}
 						local next_plugin=${WISH_PLUGINS[$(($i+1))]}
-						local fg=$(eval echo \$WISH_$(echo $plugin |
-							tr '[:lower:]' '[:upper:]')_BG)
-						local bg=$(eval echo \$WISH_$(echo $next_plugin |
-							tr '[:lower:]' '[:upper:]')_BG)
-						wish_append $bg $fg 
+						local fg_name="WISH_${plugin^^}_BG"
+						local bg_name="WISH_${next_plugin^^}_BG"
+						wish_append ${!bg_name} ${!fg_name} 
 					fi
 				else
 					local plugin=${WISH_PLUGINS[$i]}
-					local fg=$(eval echo \$WISH_$(echo $plugin |
-						tr '[:lower:]' '[:upper:]')_BG)
-					wish_append -1 $fg 
+					local fg_name="WISH_${plugin^^}_BG"
+					wish_append -1 ${!fg_name} 
 				fi
 			fi
 		fi