a general scrolling text script

Scripts/scrolling_title.sh

@@ -0,0 +1,84 @@
+#!/bin/bash
+
+# Run as follows: ./scrolling_title string
+# It will look for "string" in all active windows and display the window title that includes this string.
+# Case sensitive!
+
+# Limit for scrolling text
+LIMIT=30
+#SEPERATOR=" --- "
+#SEPERATOR=" -- "
+#SEPERATOR=" ~~~ "
+SEPERATOR=" ~~ "
+#SEPERATOR=" <> "
+SEPERATOR_LENGTH="$(echo ${#SEPERATOR})"
+
+i=1
+while :
+do  
+	# For debugging purposes
+	printf "|%02d|" $i
+
+	INPUT="$(wmctrl -l | grep -v "wmctrl" | grep -m 1 $1 | awk -v skipstart=3 -v skipend=0 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS};}')"
+
+	# If the song has changed, start from the beginning
+	if [[ "$INPUT" != "$OLD_INPUT" ]]; then
+		i=1
+	fi
+
+	# Save old input for the next check
+	OLD_INPUT="$(echo $INPUT)"
+
+	# Optional: remove multibyte characters 
+	# (they dont show up properly while scrolling due to "cut -c" being identical to "cut -b")
+	INPUT="$(echo $INPUT | tr -dc '[:print:]')"
+
+	INPUT_LENGTH="$(echo ${#INPUT})"
+
+	if [ $INPUT_LENGTH -le $LIMIT ]; then
+		# Song has a smaller title than the limit, so no need to scroll.
+		echo -n "  "
+		#echo -e -n "$INPUT"
+
+		#Justify - left
+		#SPACES=$(($LIMIT-$INPUT_LENGTH+1))
+		#echo -n "$INPUT" | awk -v spaces=$SPACES '{printf "%s%*.s\n", $0, spaces, " "}'
+
+		#Justify - center
+		SPACES_AFTER=$(($LIMIT-$(((${#INPUT}+$LIMIT)/2))))
+		printf "%*s\n" $(((${#INPUT}+$LIMIT)/2 + 1)) "$INPUT" | awk -v spaces=$SPACES_AFTER '{printf "%s%*.s\n", $0, spaces, " "}'
+
+	else
+		LOOPTAIL="$(echo $INPUT | cut -c -$LIMIT)"
+		FULLSTRING="$(echo "$INPUT$SEPERATOR$LOOPTAIL")"
+		#FULLSTRING="$(echo $INPUT | sed "s/$/$SEPERATOR/" | sed "s/$/$LOOPTAIL/" )"
+
+
+		# This is to prevent the bug when song changes and current i is larger than current song length
+		# (Not needed anymore, this bug was fixed differently)
+		# if [ $i -gt "${#FULLSTRING}" ]; then
+		# 	i=1
+		# fi
+
+		echo -n "  "
+		# Show only LIMIT characters, from i to i+LIMIT. Output scrolls due to incrementing i
+		echo -n $FULLSTRING | cut -c $i-$(($LIMIT+$i))
+		#echo -n $FULLSTRING | awk -v charlimit="$LIMIT" -v start="$i" '{print substr($0,start,charlimit)}'
+
+		# If we have shown the full string, start over
+		if [ $i -eq $(($INPUT_LENGTH+$SEPERATOR_LENGTH)) ]; then
+			i=0
+		fi
+
+
+		i=$(($i+1))
+	fi
+
+	# For fat bars/panels, I add this newline so the previous output is not visible
+	echo ""
+
+	sleep 1
+done
+
+# general method to exlude fields
+# awk -v skipstart=1 -v skipend=1 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS}; printf "\n"}'