#!/bin/sh

# linphone-desktop calls us from within several levels of
# subdirectories -- deepest seen so far:
# linphone-app/cmake_builder/linphone_package/
#
# So walk up the directory tree and hopefully find debian/changelog
for i in $(seq $(pwd|tr -cd /|wc -c) -1 0); do
     f=$(pwd | cut -d/ -f1-$((i+1)))/debian/changelog
     if [ -f "$f" ]; then
         export DEB_CHANGELOG="$f"
         break
     fi
done

if [ -z "${DEB_CHANGELOG}" -o ! -f "${DEB_CHANGELOG}" ]; then
    echo "$0: Error: DEB_CHANGELOG not set or not a file" >&2
    exit 1
fi

if [ "$1" = rev-list -a x"$2" = x--count ]; then
    echo 0;
elif [ "$1" = rev-parse -a "$2" = HEAD ]; then
    echo deadbeefdeadbeefdeadbeefdeadbeefdeadbeef # should NEVER show up anywhere
elif [ "$1" = describe ]; then
    if [ x"$2" = x -o x"$2" = x--abbrev=0 -o x"$2" = x--always ]; then
        # BC commits to SemVer in pretty much all projects
        #dpkg-parsechangelog -S Version -l ${DEB_CHANGELOG} | sed -Ene 's/^([0-9.]+)[-+].*$$/\1/p'
        dpkg-parsechangelog -l ${DEB_CHANGELOG} | sed -Ene 's/^Version: ([0-9]+:)?([0-9.]+)[-+].*$$/\2/p'
    else
        echo "$0: Error: unknown arguments" >&2
        exit 1
    fi
else
    echo "$0: Error: unknown arguments" >&2
    exit 1
fi