#!/bin/sh

checkout_branch="$(git branch --show-current)"
presentations_indexed_files="$(git diff --cached --name-only -- presentations/ | wc -l)"
indexed_files="$(git diff --cached --name-only | wc -l)"

case "$checkout_branch" in
    master)
        if [ "${presentations_indexed_files}" -gt 0 ]
        then
            cat <<\EOF
Error: Attempt to add files in presentations folder in master branch.
Files in presentations folder are to be added in special branches xelatex/*.
EOF
            exit 1
        fi
        ;;
    xelatex/*)
        if [ $presentations_indexed_files -ne $indexed_files ]
        then
            cat <<\EOF
Error: Attempt to add files outside presentations folder in special branch xelatex/*.
This branch follows only files in presentations folder.
EOF
            exit 1
        fi
        ;;
    *) exit 0;;
esac
        
exit 0