SemVer for Git implemented as pre-commit hook

git-semver.sh

#!/bin/bash

# Allows us to read user input below, assigns STDIN to keyboard
exec < /dev/tty

git rev-parse --show-toplevel | cd

file="VERSION"
if [ -f "$file" ]
then
	echo "$file file found."
	version=$(<$file)
	echo "$version"
	a=( ${version//./ } )                   # replace points, split into array
	((a[2]++))                              # increment revision (or other part)
	version="${a[0]}.${a[1]}.${a[2]}"
    echo "$version"
    echo "$version" > $file	
else
	echo "$file file not found."
	echo "Touching file VERSION..."
	touch $file
	echo "Please set an initial version in format major.minor.patch (defaults to 0.0.1)"
	if read version && [ -z "$version" ]
	then
		echo "Setting project version to 0.0.1"
		echo "0.0.1" > $file
	else
		while [[ !( $version =~ ^(\d+\.)?(\d+\.)?(\*|\d+)$ ) ]]
		do
		    echo "Version string should be major.minor.patch (defaults to 0.0.1)"
			read version
		done
		
		echo "Setting project version to $version"
		echo "$version" > $file
	fi
fi

git add $file

# Closing STDIN
exec <&-