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diff --git a/kmail/kmail-3.1-use-UOID-for-identities.pl b/kmail/kmail-3.1-use-UOID-for-identities.pl
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+++ b/kmail/kmail-3.1-use-UOID-for-identities.pl
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+#!/usr/bin/perl -w
+
+use strict;
+
+# this script goes through all the config keys that deal with
+# identities and replaces identities referenced by name to be referenced
+# by UOIDs. To this end, adds uoid keys to the identity groups.
+
+# read the whole config file:
+my $currentGroup = "";
+my %configFile;
+while ( <> ) {
+    chomp;
+    next if ( /^$/ ); # skip empty lines
+    next if ( /^\#/ ); # skip comments
+    if ( /^\[/ ) { # group begin
+	$currentGroup = $_;
+	next;
+    } elsif ( $currentGroup =~ /^\[Identity/ and /^uoid/ ) {
+	# We need to prevent this script from running twice, since it
+        # would change UOIDs of identities then.
+        # Presence of a uoid key in an [Identity #n] section is the
+	# best indicator:
+	exit;
+    } elsif ( $currentGroup ne "" ) { # normal entry
+	my ($key,$value) = split /=/;
+	$configFile{$currentGroup}{$key}=$value;
+    }
+}
+
+# filter out identity groups:
+my @identityGroups = grep { /^\[Identity \#\d+\]/ } keys %configFile;
+
+# create UOIDs for each identity:
+my %nameToUOID;
+foreach my $identityGroup (@identityGroups) {
+    my $uoid = int(rand 0x7fFFffFF);
+    my $name = $configFile{$identityGroup}{'Identity'};
+    $nameToUOID{$name} = $uoid;
+    # create the uoid entries of [Identity #n] groups:
+    print "${identityGroup}\nuoid=$uoid\n";
+}
+
+# change the default identity value:
+print "# DELETE [General]Default Identity\n[General]\nDefault Identity="
+    . $nameToUOID{$configFile{'[General]'}{'Default Identity'}} . "\n";
+
+# [Composer]previous-identity
+print "# DELETE [Composer]previous-identity\n[Composer]\nprevious-identity="
+    . $nameToUOID{$configFile{'[Composer]'}{'previous-identity'}} . "\n";
+
+# Now, go through all [Folder-*] groups and replace the Identity value
+# with the UOID. Also, move MailingListIdentity entries to Identity entries:
+my @folderGroups = grep { /^\[Folder-.*\]/ } keys %configFile;
+
+foreach my $folderGroup ( @folderGroups ) {
+    my $identity = "";
+    # delete the (MailingList)Identity keys:
+    print "# DELETE ${folderGroup}MailingListIdentity\n";
+    print "# DELETE ${folderGroup}Identity\n";
+    # extract the identity name:
+    if ( exists ($configFile{$folderGroup}{'Identity'}) ) {
+	$identity = $configFile{$folderGroup}{'Identity'};
+    }
+    if ( $identity eq ""
+	 and exists($configFile{$folderGroup}{'MailingListIdentity'}) ) {
+	$identity = $configFile{$folderGroup}{'MailingListIdentity'};
+    }
+    # write the new Identity=<uoid> key if we have an UOID for the identity:
+    if ( exists( $nameToUOID{$identity} ) ) {
+	print "$folderGroup\nIdentity=" . $nameToUOID{$identity} . "\n";
+    }
+}
+
+# Now, go through all [Filter #n] groups and change arguments to the
+# 'set identity' filter action to use UOIDs:
+
+my @filterGroups = grep { /^\[Filter \#\d+\]/ } keys %configFile;
+
+foreach my $filterGroup (@filterGroups) {
+    my $numActions = +$configFile{$filterGroup}{'actions'};
+    # go through all actions in search for "set identity":
+    for ( my $i = 0 ; $i < $numActions ; ++$i ) {
+	my $actionName = "action-name-$i";
+	my $actionArgs = "action-args-$i";
+	if ( $configFile{$filterGroup}{$actionName} eq "set identity" ) {
+	    # found one: replace it's argument with the UOID:
+	    print "# DELETE $filterGroup$actionArgs\n$filterGroup\n$actionArgs="
+		. $nameToUOID{$configFile{$filterGroup}{$actionArgs}} . "\n";
+	}
+    }
+}
+