v8.11

- DietPi-Banner | Further performance enhancements

Author: MichaIng

dietpi/func/dietpi-banner

@@ -76,61 +76,50 @@
 		'\e[91m'	# Red		| Update notifications
 	)
 
-	# Parse the above colour strings and use them to generate an expression to match them via bash substitution
-	__make_strip_color(){
-		local tmp="${aCOLOUR[*]} $COLOUR_RESET" # convert array to string
-		tmp="+(${tmp// /|})"                    # convert list into OR expression
-		tmp=${tmp//\\e/\\\\\\e}                 # ensure '\e' exists
-		tmp=${tmp//\[/\\[}                      # ensure '\[' exists
-		echo "$tmp"
-	}
-	shopt -s extglob # globally enable multiple pattern matching
-	COLOUR_STRIP=$(__make_strip_color)
-
 	# Load settings here, to have chosen ${aCOLOUR[0]} applied to below strings
 	# shellcheck disable=SC1090
 	[[ -f $FP_SAVEFILE ]] && . "$FP_SAVEFILE"
 
 	TERM_WIDTH=$(tput cols)
-
-	GREEN_LINE_FILLER=$(printf -- "─%.0s" $(seq 1 $(( $TERM_WIDTH - 2 ))))
-	GREEN_LINE=" ${aCOLOUR[0]}${GREEN_LINE_FILLER}$COLOUR_RESET"
+	printf -v GREEN_LINE "%$(( $TERM_WIDTH - 2 ))s" # Separator line with 1 space left and right respectively
+	GREEN_LINE=" ${aCOLOUR[0]}${GREEN_LINE//?/─}$COLOUR_RESET"
 	GREEN_BULLET=" ${aCOLOUR[0]}-$COLOUR_RESET"
 	GREEN_SEPARATOR="${aCOLOUR[0]}:$COLOUR_RESET"
 
 	# Print a banner line split into title and description with word-wrapping
+	shopt -s extglob # globally extended globbing for "*(pattern)" syntax
 	Print_Line()
 	{
-		local title=$1 # Bold part before ":"
+		local title=$1 # Bold part before including ":"
 		local descp=$2 # Normal part after ":"
 
 		if (( ${aENABLED[16]} == 1 ))
 		then
-			# Strip invisible colour codes in order to accurately measure the visual length of a sentence.
-			local stripped_title=${title//$COLOUR_STRIP}
-			local stripped_descp=${descp//$COLOUR_STRIP}
+			# Strip control codes to accurately measure visual length
+			local stripped_title=${title//\\e[[0-9]*([;0-9])m}
+			local stripped_descp=${descp//\\e[[0-9]*([;0-9])m}
 			local title_len=${#stripped_title}
 			local descp_len=${#stripped_descp}
 
-			# Sometimes the title is long, so a sanity check is performed to fold the title
-			# if it exceeds the window size. Because of the hyphen it receives 3 spaces padding.
+			# Wrap title if required
 			if (( $title_len >= $TERM_WIDTH ))
 			then
 				title=$(echo "$stripped_title" | fold -s -w "$TERM_WIDTH")
-				title=${title//$'\n'/$'\n'   }
+				title=${title//$'\n'/$'\n'   } # Add 3 spaces padding for hyphen
 				title="${aCOLOUR[1]}$title$COLOUR_RESET"
 				# Recalculate the title length based on the last line with padding
-				title_len=$(( (($title_len + 3) % $TERM_WIDTH) + 3 ))
+				title_len=$(( ($title_len + 3) % $TERM_WIDTH + 3 ))
 			fi
 
+			# Obtain remaining length for description starting 1 space after title
 			local avail_len=$(( $TERM_WIDTH - $title_len - 1))
-			local left_pad=$(printf -- ' %.0s' $(seq 0 "$title_len"))
 
-			# The description is typically very long, and is folded from the second line
-			# onwards into the remaining available space, with left padding.
+			# Wrap description if required
 			if (( $descp_len >= $avail_len ))
 			then
 				descp=$(echo "$stripped_descp" | fold -s -w "$avail_len")
+				local left_pad
+				printf -v left_pad "%$(( $title_len + 1 ))s"
 				descp=${descp//$'\n'/$'\n'$left_pad}
 			fi
 		fi
@@ -241,17 +230,17 @@
 
 	Print_Credits(){
 
-		Print_Line " ${aCOLOUR[2]}DietPi Team     :" "https://github.com/MichaIng/DietPi#the-dietpi-project-team"
+		Print_Line " ${aCOLOUR[2]}DietPi Team     :" 'https://github.com/MichaIng/DietPi#the-dietpi-project-team'
 
 		if [[ -f '/boot/dietpi/.prep_info' ]]; then
 		    local info=$(mawk 'NR==1 {sub(/^0$/,"DietPi Core Team");a=$0} NR==2 {print ""a" (pre-image: "$0")"}' /boot/dietpi/.prep_info)
-		    Print_Line " Image by        :" "$info"
+		    Print_Line ' Image by        :' "$info"
 		fi
 
-		Print_Line " Patreon Legends :" "Camry2731, Chris Gelatt"
-		Print_Line " Website         :" "https://dietpi.com/ | https://twitter.com/DietPi_"
-		Print_Line " Contribute      :" "https://dietpi.com/contribute.html"
-		Print_Line " Web Hosting by  :" "https://myvirtualserver.com$COLOUR_RESET\n"
+		Print_Line ' Patreon Legends :' 'Camry2731, Chris Gelatt'
+		Print_Line ' Website         :' 'https://dietpi.com/ | https://twitter.com/DietPi_'
+		Print_Line ' Contribute      :' 'https://dietpi.com/contribute.html'
+		Print_Line ' Web Hosting by  :' "https://myvirtualserver.com$COLOUR_RESET\n"
 
 	}
 
@@ -281,11 +270,11 @@
 
 	Print_Useful_Commands(){
 
-		Print_Line " ${aCOLOUR[1]}dietpi-launcher$COLOUR_RESET $GREEN_SEPARATOR" "All the DietPi programs in one place"
-		Print_Line " ${aCOLOUR[1]}dietpi-config$COLOUR_RESET   $GREEN_SEPARATOR" "Feature rich configuration tool for your device"
-		Print_Line " ${aCOLOUR[1]}dietpi-software$COLOUR_RESET $GREEN_SEPARATOR" "Select optimised software for installation"
-		Print_Line " ${aCOLOUR[1]}htop$COLOUR_RESET            $GREEN_SEPARATOR" "Resource monitor"
-		Print_Line " ${aCOLOUR[1]}cpu$COLOUR_RESET             $GREEN_SEPARATOR" "Shows CPU information and stats\n"
+		Print_Line " ${aCOLOUR[1]}dietpi-launcher$COLOUR_RESET $GREEN_SEPARATOR" 'All the DietPi programs in one place'
+		Print_Line " ${aCOLOUR[1]}dietpi-config$COLOUR_RESET   $GREEN_SEPARATOR" 'Feature rich configuration tool for your device'
+		Print_Line " ${aCOLOUR[1]}dietpi-software$COLOUR_RESET $GREEN_SEPARATOR" 'Select optimised software for installation'
+		Print_Line " ${aCOLOUR[1]}htop$COLOUR_RESET            $GREEN_SEPARATOR" 'Resource monitor'
+		Print_Line " ${aCOLOUR[1]}cpu$COLOUR_RESET             $GREEN_SEPARATOR" 'Shows CPU information and stats\n'
 
 	}