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