sa-learn: Add documentation

Add POD documentation and tidy up

plugins/other/sa-learn

@@ -1,9 +1,44 @@
 #!/bin/bash
+
+: <<=cut
+=head1 NAME
+
+sa-learn - Munin plugin to monitor spamassasin bayes database size
+
+=head1 APPLICABLE SYSTEMS
+
+Any server running spamassassin
+
+=head1 CONFIGURATION
+
+This plugin assumes your Spamassassin database is in /var/lib/MailScanner.
+If it's elsewhere (or you want to use a different database) you will need
+a configuration such as:
+
+   [sa-learn]
+      env.BayesDir /path/to/bayes/directory/
+      user mail
+
+(where 'user mail' refers to a user that can read the database).
+
+=head1 MAGIC MARKERS
+
 #%# family=contrib
 
+=head1 VERSION
+
+2
+
+=head1 AUTHOR
+
+Paul Saunders L<darac+munin@darac.org.uk>
+
+=cut
+#'
+
 case $1 in
-        config)
-                cat <<'EOM'
+	config)
+		cat <<'EOM'
 graph_title SA-Learn Magic
 graph_vlabel Count
 graph_args --base 1000 -l 0
@@ -15,26 +50,26 @@ ham.type GAUGE
 tokens.label Num Tokens
 tokens.type GAUGE
 EOM
-                exit 0;;
+		exit 0;;
 esac
 
 ## Print values
 BayesDir=${BayesDir:-/var/lib/MailScanner}
 
-sa-learn --dbpath $BayesDir --dump magic 2>/dev/null | while read line
+sa-learn --dbpath $BayesDir/ --dump magic 2>/dev/null | while read line
 do
-        case "$line" in
-                *nspam*)
-                        echo -n "spam.value "
-                        echo $line | awk '{print $3}'
-                        ;;
-                *nham*)
-                        echo -n "ham.value "
-                        echo $line | awk '{print $3}'
-                        ;;
-                *ntokens*)
-                        echo -n "tokens.value "
-                        echo $line | awk '{print $3}'
-                        ;;
-        esac
+	case "$line" in
+		*nspam*)
+			echo -n "spam.value "
+			echo $line | awk '{print $3}'
+			;;
+		*nham*)
+			echo -n "ham.value "
+			echo $line | awk '{print $3}'
+			;;
+		*ntokens*)
+			echo -n "tokens.value "
+			echo $line | awk '{print $3}'
+			;;
+	esac
 done