git-version-gen

#!/bin/bash
# Print a version string.
# 1: Path to the version file
# 2: Prefix for the last tag used to describe the version eg: longomatch-*
scriptversion=2014-12-02.19; # UTC

# Avoid meddling by environment variable of the same name.
file=$1

# Read the version from the file
IFS='' read -r line < ${file}
v=$line

# Recreate the number of commits and append it to the version from the file.
vcommit=`git log -n 1 --pretty=format:%H -- $file`
commit_list=`git rev-list "$vcommit"..HEAD 2>/dev/null` \
    || { commit_list=failed;
         echo "WARNING: git rev-list failed" 1>&2; }

if [[ "x$commit_list" = "x" ]]; then
    numcommits="0"
else 
    numcommits=`echo "$commit_list" | wc -l`
fi
current_commit_hash=`git rev-parse --short=7 HEAD`

shortVersion=`echo "$v"."$numcommits" | tr -d '[:space:]'`
longVersion=`echo "$shortVersion"-"$current_commit_hash"`

if [[ "$1" = *"MobileVersion"* ]]; then
    v=$shortVersion
else 
    v=$longVersion
fi

# Omit the trailing newline, so that m4_esyscmd can use the result directly.
printf %s "$v"