git-now

#!/bin/sh

PREFIX="from now"
MESSAGE="[${PREFIX}] `date`"

if [ $# -eq 0 ]
then
    git add -u
    printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
elif [ $1 != "--rebase" ]
then
    git add $@
    printf "${MESSAGE}\n\n%s" "`git diff --cached`" | git commit -F -
else
    FIRST_NOW_COMMIT=`git log --pretty=oneline --grep="${PREFIX}" | tail -n 1 | cut -d " " -f 1`
    INITIAL_COMMIT=`git log --pretty=oneline | tail -n 1 | cut -d " " -f 1`

    if [ ${FIRST_NOW_COMMIT} != ${INITIAL_COMMIT} ]
    then
        git rebase -i ${FIRST_NOW_COMMIT}^
    else
        WORKING_BRANCH=`git branch -l | grep "*" | cut -d " " -f 2`

        git checkout ${FIRST_NOW_COMMIT}
        git commit --amend
        git rebase --onto HEAD ${FIRST_NOW_COMMIT} ${WORKING_BRANCH}
    fi
fi