From e2b1d6985b3bdcca64e8f3f3e5ba428bb311b561 Mon Sep 17 00:00:00 2001
From: lars <lars@systemausfall.org>
Date: Mon, 24 May 2010 00:30:44 +0000
Subject: [PATCH] added a script for channel sorting in MythTV

---
 channel_sort_mythtv.sh | 132 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100755 channel_sort_mythtv.sh

diff --git a/channel_sort_mythtv.sh b/channel_sort_mythtv.sh
new file mode 100755
index 0000000..ed896d8
--- /dev/null
+++ b/channel_sort_mythtv.sh
@@ -0,0 +1,132 @@
+#!/bin/sh
+#
+# a small shell script for automatic ordering of TV channels in MythTV
+#
+# BIG FAT WARNING: this script was tested only with MythTV v0.23.
+# Future versions of mythtv possibly use an incompatible database layout.
+#
+# The following workflow is recommended:
+#  1) backup the current channel settings:
+#	./channel_sort_mythtv.sh dump >mythtv_channels_dump.sql
+#  2) retrieve the current list of channel names
+#	./channel_sort_mythtv.sh get >channels.list
+#  3) sort the channels in 'channels.list' with your favourite text editor
+#  4) upload the new channel order (starting from channum=1):
+#	./channel_sort_mythtv.sh set <channel.list
+#
+# After another channel scan you can run this script again with the
+# 'merge' argument. It reads your current channel order from stdin
+# and appends all 'new' channels (taken from the database).
+# 
+#
+# Copyright 2010 Lars Kruse <devel@sumpfralle.de>
+#
+# This script is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This script is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this script.  If not, see <http://www.gnu.org/licenses/>.
+
+
+set -eu
+
+MYSQL_CONF_FILE=${MYSQL_CONF_FILE:-}
+
+# only used for "set" operation:
+# 	use this channel number for all channels, that are listed in stdin
+#	set to an empty string, if the channels, that are not listed, should remain untouched
+DEFAULT_CHANNEL=10000
+
+# set DEBUG to a non-empty string to output the result sql statements instead of executing them
+DEBUG=${DEBUG:-false}
+export DEBUG
+
+# read the mysql connection settings from the myth config
+# this exposes DBHostName, DBUserName, DBName and DBPassword
+for mysql_config in "$MYSQL_CONF_FILE" ~/.mythtv/mysql.txt /etc/mythtv/mysql.txt; do
+	if test -n "$mysql_config" && test -r "$mysql_config"; then
+		. "$mysql_config"
+		break
+	 fi
+ done
+set +u
+if test -z "$DBHostName" -o -z "$DBUserName" -o -z "$DBName" -o -z "$DBPassword"; then
+	echo "Failed to read the mysql settings file of MythTV." >&2
+	echo "You can set the environement variable MYSQL_CONF_FILE to specify a custom location." >&2
+ fi
+set -u
+
+
+send_mysql_statement() {
+	if test "$DEBUG" != "false"; then
+		# show a blank first line, since it would get removed in "get" otherwise
+		cat -
+	 else
+		mysql -h "$DBHostName" -u "$DBUserName" --password="$DBPassword" --skip-column-names "$DBName"
+	 fi
+}
+
+show_syntax() {
+	echo "Syntax: $(basename "$0") ACTION"
+	echo "Possible actions:"
+	echo "	get	- get all unsorted channel names from the database (to stdout)"
+	echo "	set	- read the desired order of channels (by name) from stdin"
+	echo "	merge	- output stdin and add all channel names (from the database)"
+	echo "		  that were not listed before (to stdout)"
+	echo "	dump	- dump the current state of the 'channel' table (as a backup)"
+	echo "	help	- show this syntax description"
+	echo "Hint: the 'get' operation does to same as 'merge' with empty stdin."
+}
+
+
+ACTION=invalid
+test $# -gt 0 && ACTION="$1"
+
+case "$ACTION" in
+	get)
+		# get distinct names and ignore empty lines
+		echo "SELECT DISTINCT name FROM channel ORDER BY LPAD(channum, 3, 0) ASC;" \
+			| send_mysql_statement \
+			| grep -v "^$"
+		;;
+	set)
+		(
+			# reset all channel numbers to the default value if it is not empty
+			test -n "$DEFAULT_CHANNEL" && echo "update channel set channum='$DEFAULT_CHANNEL';"
+			current_num=1
+			cat - | grep -v "^$" | while read channel; do
+				# escape single quotes
+				channel=$(echo "$channel" | sed "s/'/\\\\'/g")
+				echo "update channel set channum=$current_num where name='$channel';"
+				current_num=$((current_num + 1))
+			 done
+		) | send_mysql_statement
+		
+		;;
+	merge)
+		input="$(cat -)"
+		echo "$input"
+		"$0" get | while read channel; do echo "$input" | grep -q "^$channel$" || echo "$channel"; done
+		;;
+	dump)
+		mysqldump -h "$DBHostName" -u "$DBUserName" --password="$DBPassword" "$DBName" channel
+		;;
+	help|--help|invalid)
+		if test "$ACTION" = "invalid"; then
+			show_syntax >&2
+			exit 1
+		 else
+			show_syntax
+		fi
+		;;
+ esac
+
+exit 0
+