SQL Schema versioning, VACUUM on exit

lib/database/checkVersion

@@ -0,0 +1,26 @@
+#!/bin/bash
+currentdbversion=1
+checkDatabaseVersion() {
+	local dbversion
+	if dbversion=$(Select atom version <<<"1 = 1")
+	then
+		if (( dbversion == currentdbversion ))
+		then
+			return 0
+		elif (( dbversion < currentversion ))
+		then
+			until (( dbversion == currentversion ))
+			do
+				upgradedatabase_${dbversion}_$((dbversion+1))
+				dbversion=$(Select atom version <<<"1 = 1")
+			done
+		else
+			echo "Database schema version $dbversion is higher than
+				that of this version of AtOM
+				($currentdbversion). Bailing out." >&2
+			exit 1
+		fi
+	else
+		Insert atom 1 <<<"version $currentdbversion"
+	fi
+}	

lib/database/close

@@ -1,5 +1,6 @@
 #!/bin/bash
 closeDatabase() {
+	echo 'vacuum;' >&3
 	echo .quit >&3
 	(( debug )) && echo -n "Waiting for SQLite to terminate... "
 	wait

lib/database/open

@@ -15,4 +15,5 @@ openDatabase() {
 	cat $schema >&3
 	echo '.separator ::AtOM:SQL:Sep::' >&3
 	echo 'PRAGMA foreign_keys = ON;' >&3
+	checkDatabaseVersion
 }

share/schema.sql

@@ -1,4 +1,7 @@
 BEGIN TRANSACTION;
+CREATE TABLE IF NOT EXISTS atom (
+	version		INTEGER
+);
 CREATE TABLE IF NOT EXISTS source_files (
 	id		INTEGER PRIMARY KEY,
 	filename	TEXT	UNIQUE NOT NULL,
@@ -111,8 +114,7 @@ CREATE TRIGGER IF NOT EXISTS create_tags AFTER INSERT ON source_files
 BEGIN
 	INSERT INTO tags (source_file,last_change) VALUES (new.id,0);
 END;
-DROP TRIGGER IF EXISTS force_destination_update_on_tag_update;
-CREATE TRIGGER force_destination_update_on_tag_update
+CREATE TRIGGER IF NOT EXISTS force_destination_update_on_tag_update
 	AFTER UPDATE OF
 		genre,
 		albumartist,
@@ -126,7 +128,8 @@ CREATE TRIGGER force_destination_update_on_tag_update
 		performer,
 		rate,
 		channels,
-		bitrate
+		bitrate,
+		bitdepth
 	ON tags
 BEGIN
 	UPDATE destination_files SET last_change=0