# /usr/bin/env bash
#
# Determines the revision number of the next commit and replaces 
# the string "$REV" in CHANGES.features with it. Then it
# passes all of its arguments on to "svn commit".
#
# Note that as we don't lock the repository there is a race
# condition between determining the revision number and doing the
# commit. Double-check the output; the revision number reported 
# at the beginning should match the one at termination.

PATTERN='\$REV'
CHANGES=CHANGES.features
MSGTMP=bro-commit.msg

# Find the CHANGES.features.
for i in . .. ../.. ../../..; do
    if [ -e $i/$CHANGES ]; then
        changes=$i/$CHANGES
        break;
    fi
done

if [ "$changes" == "" ]; then
   echo Cannot find CHANGES.features.
   exit 1
fi

count=`grep -c $PATTERN $changes`

if [ "$count" == "0" ]; then
   echo No $PATTERN in $changes | sed 's/\\//g'
   exit 1
fi   

if [ "$count" != "1" ]; then
   echo More than one $PATTERN in $changes.
   exit 1
fi   

REPO=`svn info | grep 'Repository Root' | awk '{print $3}'`

if [ "$REPO" == "" ]; then
   echo Cannot determine repository root.
   exit 1
fi   

# Extract commit message. 
cat $changes | awk '/^- /{msg=$0 "\n"; next;}/\$REV/{printf msg; exit;}{ msg = msg $0 "\n";}' >$MSGTMP
echo Commit message in $MSGTMP:
echo '------'
cat $MSGTMP
echo '------'

revision=`svn log -r HEAD $REPO | awk 'NR==2{print substr($1, 2);}'`
revision=`expr $revision '+' 1`

echo Next revision is $revision

echo Adapting $changes 

cp -f $changes $changes.bak
cat $changes | sed "s/$PATTERN/r$revision/g" >$changes.tmp && mv $changes.tmp $changes

args=$@

if [ "$args" == "" ]; then
   args="."
fi   

svn commit $args CHANGES.features 

if [ "$?" != 0 ]; then
   echo "svn failed; restoring $changes"
   cp -f $changes.bak $changes 
   exit 1
fi

echo Double-check revision number: $revision

rm -f $MSGTMP