Index: svn2cl.sh
===================================================================
--- svn2cl.sh
+++ svn2cl.sh	2009-11-30 10:33:33.000000000 +0100
@@ -49,6 +49,7 @@
 SEPARATEDAYLOGS="no"
 ACTIONS="no"
 CHANGELOG=""
+CHANGELOG_BAK=""
 OUTSTYLE="cl"
 SVNLOGCMD="svn --verbose --xml log"
 SVNINFOCMD="svn --non-interactive info"
@@ -57,6 +58,7 @@
 TITLE="ChangeLog"
 REVISION_LINK="#r"
 TMPFILES=""
+ACCUM="no"
 AWK="awk"
 
 # do command line checking
@@ -157,6 +159,10 @@
       OUTSTYLE="html"
       shift
       ;;
+     --accum)
+       ACCUM="yes"
+       shift
+       ;;
     -r|--revision|--targets|--limit)
       # add these as extra options to the command (with argument)
       arg=`echo "$2" | sed "s/'/'\"'\"'/g"`
@@ -229,6 +235,7 @@
       echo "  --stdout             output to stdout instead of ChangeLog"
       echo "  --authors=FILE       file to read for authors"
       echo "  --html               output as html instead of plain text"
+      echo "  --accum              add to an existing file"
       echo "  -h, --help           display this help and exit"
       echo "  -V, --version        output version information and exit"
       echo ""
@@ -305,6 +312,19 @@
 # redirect stdout to the changelog file if needed
 if [ "x$CHANGELOG" != "x-" ]
 then
+  if [ "$ACCUM" = "yes" ]
+  then
+    date=`sed -ne 's/^\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\s\+\(\w\+\s\+\)\?[0-9][0-9]:[0-9][0-9]\).*/\1/;T;p;q' $CHANGELOG 2>/dev/null`
+    if [ -n "$date" ]
+    then
+      SVNLOGCMD="$SVNLOGCMD -r 'HEAD:{$date}'"
+    else
+        echo "no date found in existing changelog file, accum skipped"
+        ACCUM="no"
+    fi
+    CHANGELOG_BAK="$CHANGELOG.bak"
+    cp -f "$CHANGELOG" "$CHANGELOG_BAK"
+  fi
   exec > "$CHANGELOG"
 fi
 
@@ -327,6 +347,8 @@
            --nonet \
            "$XSL" -
 
+[ -n "$CHANGELOG_BAK" ] && cat "$CHANGELOG_BAK"
+
 # clean up temporary files
 [ -n "$TMPFILES" ] && eval "rm -f $TMPFILES"