#!/bin/bash
TODOFILE=~/docs/todo

vim $TODOFILE
RETURNED=$?
if [ $RETURNED -ne 0 ]
then
    # don't do much if vim didn't exit cleanly
    echo "vim exited with code $RETURNED"
else
    # otherwise commit the changes to the repository

    # calculated the changes by counting the '-'s and '+' in the diff output
    # then find the difference between these numbers with expr
    ADDED=$(expr `svn diff ~/docs/todo |grep "^+"|wc -l` - `svn diff ~/docs/todo |grep "^-"|wc -l`)

    # print a message before committing
    echo "tasks added: $ADDED"

    # do the actual commit
    svn commit -m "todo list, tasks added: $ADDED" $TODOFILE
fi