From df62152260bdd5c39903894095c57c894fd75723 Mon Sep 17 00:00:00 2001
From: Isaiah Odhner <isaiahodhner@gmail.com>
Date: Thu, 27 Apr 2023 01:09:45 -0400
Subject: [PATCH] Add tiling mode to terminal wallpaper script

---
 terminal-wallpaper.sh | 112 ++++++++++++++++++++++++++++++------------
 1 file changed, 80 insertions(+), 32 deletions(-)

diff --git a/terminal-wallpaper.sh b/terminal-wallpaper.sh
index b6b993c..3d08c20 100644
--- a/terminal-wallpaper.sh
+++ b/terminal-wallpaper.sh
@@ -5,42 +5,90 @@
 clear
 
 TERMINAL_WALLPAPER=/home/io/Projects/textual-paint/samples/galaxies.ans
-# Draw terminal background (basic)
-# cat $TERMINAL_WALLPAPER
+TERMINAL_WALLPAPER_MODE=TILE
 
-# Split lines of terminal background into array
-IFS=$'\n' read -d '' -r -a lines < $TERMINAL_WALLPAPER
+# Draw terminal background according to mode
+if [[ $TERMINAL_WALLPAPER_MODE == "TOP_LEFT" ]]; then
+	cat $TERMINAL_WALLPAPER
+elif [[ $TERMINAL_WALLPAPER_MODE == "CENTER" ]]; then
 
-# Measure image size
-image_height=${#lines[@]}
-image_width=0
-for (( y=0; y<$image_height; y++ )); do
-	line=${lines[$y]}
-	# Have to strip ANSI escape sequences from line length
-	line_length=${#line}
-	filtered_line=$(sed -r "s/\x1B\[[0-9;]*[mK]//g" <<< "$line")
-	line_width=${#filtered_line}
+	# Split lines of terminal background into array
+	IFS=$'\n' read -d '' -r -a lines < $TERMINAL_WALLPAPER
 
-	# echo "y=$y line         : $line line_length=$line_length"
-	# echo "y=$y filtered line: $filtered_line line_width=$line_width"
+	# Measure image size
+	image_height=${#lines[@]}
+	image_width=0
+	for (( y=0; y<$image_height; y++ )); do
+		line=${lines[$y]}
+		# Have to strip ANSI escape sequences from line length
+		line_length=${#line}
+		filtered_line=$(sed -r "s/\x1B\[[0-9;]*[mK]//g" <<< "$line")
+		line_width=${#filtered_line}
 
-	if [[ $line_width -gt $image_width ]]; then
-		image_width=$line_width
-	fi
-done
-# Draw background centered
-terminal_width=$(tput cols)
-terminal_height=$(tput lines)
-offset_x=$(( ($terminal_width - $image_width) / 2 ))
-offset_y=$(( ($terminal_height - $image_height) / 2 ))
-# Ensure offset is positive
-if [[ $offset_x -lt 0 ]]; then offset_x=0; fi
-if [[ $offset_y -lt 0 ]]; then offset_y=0; fi
-# Draw image
-for (( i=0; i<$image_height; i++ )); do
-	tput cup $(( $offset_y + $i )) $offset_x
-	echo -e "${lines[$i]}"
-done
+		# echo "y=$y line         : $line line_length=$line_length"
+		# echo "y=$y filtered line: $filtered_line line_width=$line_width"
+
+		if [[ $line_width -gt $image_width ]]; then
+			image_width=$line_width
+		fi
+	done
+	# Calculate offset
+	terminal_width=$(tput cols)
+	terminal_height=$(tput lines)
+	offset_x=$(( ($terminal_width - $image_width) / 2 ))
+	offset_y=$(( ($terminal_height - $image_height) / 2 ))
+	# Ensure offset is positive
+	if [[ $offset_x -lt 0 ]]; then offset_x=0; fi
+	if [[ $offset_y -lt 0 ]]; then offset_y=0; fi
+	# Draw image
+	for (( i=0; i<$image_height; i++ )); do
+		tput cup $(( $offset_y + $i )) $offset_x
+		echo -e "${lines[$i]}"
+	done
+elif [[ $TERMINAL_WALLPAPER_MODE == "TILE" ]]; then
+
+	# Split lines of terminal background into array
+	IFS=$'\n' read -d '' -r -a lines < $TERMINAL_WALLPAPER
+
+	# Measure image size
+	image_height=${#lines[@]}
+	image_width=0
+	for (( y=0; y<$image_height; y++ )); do
+		line=${lines[$y]}
+		# Have to strip ANSI escape sequences from line length
+		line_length=${#line}
+		filtered_line=$(sed -r "s/\x1B\[[0-9;]*[mK]//g" <<< "$line")
+		line_width=${#filtered_line}
+
+		# echo "y=$y line         : $line line_length=$line_length"
+		# echo "y=$y filtered line: $filtered_line line_width=$line_width"
+
+		if [[ $line_width -gt $image_width ]]; then
+			image_width=$line_width
+		fi
+	done
+
+	# Draw tiled image
+	tput rmam
+	setterm -linewrap off
+	terminal_width=$(tput cols)
+	terminal_height=$(tput lines)
+	for (( y=0; y<$terminal_height; y+=$image_height )); do
+		for (( x=0; x<$terminal_width; x+=$image_width )); do
+			for (( i=0; i<$image_height; i++ )); do
+				# Don't scroll past bottom of terminal
+				if [[ $(( $y + $i + 1 )) -ge $terminal_height ]]; then
+					break
+				fi
+				# Draw line
+				tput cup $(( $y + $i )) $x
+				echo -e "${lines[$i]}"
+			done
+		done
+	done
+	tput smam
+	setterm -linewrap on
+fi
 
 # Reset cursor position
 echo -e "\033[0;0H"