#!/bin/sh
# Licensed under the "Fair License (Fair)" (2015, Fair License: http://fairlicense.org/) (or any other fucking license that is equivalent...)
# (C) 2017 Michael Lustenberger (mic at inofix.ch)
# Usage of the works is permitted provided that this instrument is retained with the works, so that any entity that uses the works is notified of this instrument.
# DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.
#
# Intended Usage:
# * Tag your git repo with e.g. `git tag -a 0.1`
# * Copy this script to your .git/hooks/ (and mark it executable..)
# * Any time you want to manually set a version (release), commit all changes,
#   set the version in $version_file/$setup_file, tag repo to the release
#   (do not push it, we will re-tag again later) and commit the change of
#   the version, then tag again with '-f' and push everything
# If someone has a simpler, yet equally powerful, idea, please send it to
# me (mic at inofix.ch).

# always find the version here..
version_file=version.txt
# send a copy to PyPI setup.py
setup_file=setup.py

if ! git describe >/dev/null 2>&1 ; then
    echo "This project has no version info yet! Use 'git tag -a <version>' to start versioning.."
    exit 1
fi

if ! git diff --quiet HEAD ; then
    # something has changed in the repository
    if git diff --quiet ; then
        # this means the changes were actually added

        new_version=`git describe`
        old_version=`grep "^Internal Version: .*$" $version_file | awk '{print $3}'`

        if [ "$new_version" != "$old_version" ] ; then
            # do nothing if a version was tagged manually

            # convert the git version to a PEP440 compliant form
            i=0
            for v in `echo $new_version | tr "-" " "` ; do
                eval "v_$i=$v"
                i=$(($i+1))
            done

            pypi_version="$v_0"
            if [ -n "$v_1" ] && [ -n "$v_2" ] ; then
                pypi_version="$v_0.dev$v_1+$v_2"
            fi

            # set it into version.txt and setup.py
            echo "Something has changed, count up the version to $new_version ($pypi_version resp.)"

            sed -i 's;^Internal Version: .*$;Internal Version: '${new_version}';' $version_file
            sed -i 's;^Official Version: .*$;Official Version: '${pypi_version}';' $version_file
            git add $version_file
            sed -i "s;    version='.*',;    version='${pypi_version}',;" $setup_file
            git add $setup_file
        fi
    fi
fi