Useful PHP Subversion Commit Hook

#!/bin/bash
 
REPOS="$1"
TXN="$2"
 
PHP="/usr/bin/php"
SVNLOOK="/usr/bin/svnlook"
AWK="/usr/bin/awk"
GREP="/bin/egrep"
SED="/bin/sed"
 
CHANGED=`$SVNLOOK changed -t "$TXN" "$REPOS" | $AWK '{print $2}' | $GREP \\.php$`
 
for FILE in $CHANGED
do
    MESSAGE=`$SVNLOOK cat -t "$TXN" "$REPOS" "$FILE" | $PHP -l`
    if [ $? -ne 0 ]
    then
        echo 1>&2
        echo "***********************************" 1>&2
        echo "PHP error in: $FILE:" 1>&2
        echo `echo "$MESSAGE" | $SED "s| -| $FILE|g"` 1>&2
        echo "***********************************" 1>&2
        exit 1
    fi
done
 
# Make sure that the log message contains some text.
SVNLOOKOK=1
SVNLOOK=/usr/bin/svnlook
$SVNLOOK log -t "$TXN" "$REPOS" | \
   grep "[a-zA-Z0-9]" > /dev/null || SVNLOOKOK=0
if [ $SVNLOOKOK = 0 ]; then
  echo Empty log messages are not allowed. Please provide a proper log message. 1>&2
  exit 1
fi
 
# Make sure text might be meaningful
LOGMSGLEN=$($SVNLOOK log -t "$TXN" "$REPOS" | grep [a-zA-Z0-9] | wc -c)
if [ "$LOGMSGLEN" -lt 6 ]; then
  echo -e "Please provide a meaningful comment when committing changes." 1>&2
  exit 1
fi
 
# All checks passed, so allow the commit.
exit 0