From 2d3d807bccda4da8e77564e5e0f184f3cf1976a6 Mon Sep 17 00:00:00 2001
From: Justin Emter <justinemter@gmail.com>
Date: Sun, 20 Aug 2017 13:24:11 -0700
Subject: [PATCH] added channelup.sh script

---
 bash-scripts/channelup.sh | 106 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 bash-scripts/channelup.sh

diff --git a/bash-scripts/channelup.sh b/bash-scripts/channelup.sh
new file mode 100644
index 0000000..4162ffc
--- /dev/null
+++ b/bash-scripts/channelup.sh
@@ -0,0 +1,106 @@
+#!/bin/bash
+
+# file: channelup.sh
+
+#----
+# Simple script to cycle through multiple pseudo-channel instances - triggering start / stop.
+#----
+
+#---- 
+# To Use:
+# Configure something (a tv remote or alexa) to trigger this script. Make sure you move this script just 
+# outside of the pseudo-channel directories:
+# -------------------
+# -channels/
+# --pseudo-channel_1/
+# ---startstop.sh
+# --pseudo-channel_2/
+# ---startstop.sh
+# --pseudo-channel_3/
+# ---startstop.sh
+# --channelup.sh <--- on the same level as the 3 channels. 
+#----
+
+# Make sure that each channel dir ends with a "_" + an incrementing number as seen above.
+
+#----BEGIN EDITABLE VARS----
+
+SCRIPT_TO_EXECUTE='startstop.sh'
+
+OUTPUT_PREV_CHANNEL_PATH=.
+
+OUTPUT_PREV_CHANNEL_FILE=".prevplaying"
+
+CHANNEL_DIR_INCREMENT_SYMBOL="_"
+
+#----END EDITABLE VARS-------
+
+# If the previous channel txt file doesn't exist already create it (first run?)
+if [ ! -e "$OUTPUT_PREV_CHANNEL_PATH/$OUTPUT_PREV_CHANNEL_FILE" ]; then
+
+	echo 1 > "$OUTPUT_PREV_CHANNEL_PATH/$OUTPUT_PREV_CHANNEL_FILE"
+
+fi
+
+# If the file exists b
+
+# Scan the dir to see how many channels there are, store them in an arr.
+CHANNEL_DIR_ARR=( $(find . -maxdepth 1 -type d -name '*'"$CHANNEL_DIR_INCREMENT_SYMBOL"'[[:digit:]]' -printf "%P\n") )
+
+# If this script see's there are multiple channels, 
+# then read file, get prevchannel, increment, and trigger next channel:
+if [ "${#CHANNEL_DIR_ARR[@]}" -gt 1 ]; then
+
+	NEXT_CHANNEL=""
+
+	PREV_CHANNEL_FOUND=false
+
+	PREV_CHANNEL_DIR=""
+
+	echo "+++++ There are ${#CHANNEL_DIR_ARR[@]} channels detected."
+
+	PREV_CHANNEL=$(<$OUTPUT_PREV_CHANNEL_PATH/$OUTPUT_PREV_CHANNEL_FILE)
+
+	echo "+++++ It looks like the previous channel was: $PREV_CHANNEL"
+
+	# Now that the prevchannel is stored in a var, loop through channels and find prev channel & increment
+	for channel in "${CHANNEL_DIR_ARR[@]}"
+	do
+		if [[ $channel == *"$PREV_CHANNEL"* ]]; then
+  			echo "+++++ Found previous channel, incrementing by 1."
+  			PREV_CHANNEL_FOUND=true
+  			PREV_CHANNEL_DIR=$channel
+  			continue
+		fi
+
+		if [ "$PREV_CHANNEL_FOUND" = true ] ; then
+		    
+		    NEXT_CHANNEL=$channel
+
+			break
+		
+		fi
+
+	done
+
+	# If the next channel is an empty string, then we need to start the cycle over.
+	if [ -z "$NEXT_CHANNEL" ]; then
+
+		NEXT_CHANNEL=${CHANNEL_DIR_ARR[0]}
+
+	fi
+
+	echo "+++++ The next channel is: $NEXT_CHANNEL"
+
+	# Write next channel to previous channel file to reference later
+	echo "$NEXT_CHANNEL" | cut -d "_" -f2  > "$OUTPUT_PREV_CHANNEL_PATH/$OUTPUT_PREV_CHANNEL_FILE"
+
+	# Finally let's trigger the startstop script in both the previous channel and the next channel dirs.
+	# This will stop the previous channels playback & trigger the next channels playback
+	"$OUTPUT_PREV_CHANNEL_PATH"/"$PREV_CHANNEL_DIR"/"$SCRIPT_TO_EXECUTE"
+	sleep 1
+	"$OUTPUT_PREV_CHANNEL_PATH"/"$NEXT_CHANNEL"/"$SCRIPT_TO_EXECUTE"
+
+fi
+
+exit 0
\ No newline at end of file