#!/bin/bash

# Basic options

# Branch to save in
branch=work

# Remote to upload to
remote=origin


error() {
 echo $1
 exit 1
}

# Name of current branch
cb=$(git rev-parse --abbrev-ref HEAD)

# Check if correct branch
[[ $branch == $cb ]] || error "Working on incorrect branch \"$cb\"!"

# Check if there's anything to commit
if [ -z "$(git status --porcelain)" ]; then
 error "Nothing to save!"
fi

# Name of last commit
last=$(git log -1 --pretty=%s)

# Check if last commit name is valid
# Structure must be "commit###" where # is number
[[ ${#last} -eq 9 ]] || error "Incorrect last commit name length \"$last\"!"
[[ ${last:0:6} == "commit" ]] || error "Incorrect last commit name \"$last\"!"

# Last commit number, also remove leading zeros
lcn=${last:6:9}

[[ $lcn -eq "000" ]] && lcn=0 || lcn=$(echo $lcn | sed 's/^0*//') # TODO: a cleaner sed

# Check if integer
[[ $lcn =~ ^-?[0-9]+$ ]] || error "Incorrect last commit number \"$last\"!"

# New commit number
printf -v ncn "%03d" $(($lcn + 1))
git add .
git commit -m "commit$ncn"
git push $remote $branch
echo "Work saved!"