#!/bin/sh

# repot && transaction arguments
REPOS="$1"
TXN="$2"

# svnlook command
SVNLOOK=/usr/local/bin/svnlook

# file filter: we only allow commit .c && .h files.
FILTER='\.(c|h)$'

# max file size in bytes after commit.
MAX_SIZE=102400

# max change per one commit
MAX_CHANGE_LINES=50

files=$($SVNLOOK changed -t $TXN $REPOS | awk '{print $2}')

# check
for f in $files
do
    # check file type
    if echo $f | grep -Eq $FILTER ; then
        # valid file
        :
    else
        echo "File $f is not a .h or .c file" >> /dev/stderr
        exit 1
    fi

    # check file size
    filesize=$($SVNLOOK cat -t $TXN $REPOS $f | wc -c)
    if [ $filesize -gt $MAX_SIZE ] ; then
        echo "File $f is too large (must <= $MAX_SIZE)" >> /dev/stderr
        exit 1
    fi

    # check change lines
    changelines=$($SVNLOOK diff -t $TXN $REPOS $f | grep -E '^(\+|-)' | wc -l)
    if [ $changelines -gt $MAX_CHANGE_LINES ] ; then
        echo "File $f changes too much ($changelines lines, must <= $MAX_CHANGE_LINES)" >> /dev/stderr
        exit 1
    fi
done

exit 0

/usr/local/bin/wireshark &