Semver - git hook

commit-msg

#!/bin/sh
#
# An example hook script to check the commit log message.
# Called by "git commit" with one argument, the name of the file
# that has the commit message.  The hook should exit with non-zero
# status after issuing an appropriate message if it wants to stop the
# commit.  The hook is allowed to edit the commit message file.
#
# To enable this hook, rename this file to "commit-msg".

# Uncomment the below to add a Signed-off-by line to the message.
# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
# hook is more suited to it.
#
# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"

# This example catches duplicate Signed-off-by lines.

message="`cat $1`"
root_dir=`git rev-parse --show-toplevel`
version=`grep -e "^VERSION: " $root_dir/README.md | sed 's/VERSION: //g'`

semver_update() {
   sed -i "s/VERSION: .*/VERSION: $1/" $root_dir/README.md
   echo "v$1" > $root_dir/.git/.semver.newver
   return 0
}


major=`echo $version | grep -oe "^[0-9]\+"`
version=`echo $version | sed 's/^[0-9]\+\.//'`

minor=`echo $version | grep -oe "^[0-9]\+"`
version=`echo $version | sed 's/^[0-9]\+\.//'`

patch=`echo $version | grep -oe "^[0-9]\+"`
version=`echo $version | sed 's/^[0-9]\+\.\?//'`

version=`echo $version | sed 's/^-rc//'`
release_candidate=`echo $version | grep -oe "[0-9]\+"`

if [[ "$message" == "rc"*"("* ]]; then

   if [[ -z $release_candidate ]]; then
      if [[ "$message" == "rc-major("* ]]; then
         major="$(( $major + 1 ))"
      elif [[ "$message" == "rc-minor("* ]]; then
         minor="$(( $minor + 1 ))"
      else
         patch="$(( $patch + 1 ))"
      fi
      release_candidate=0
   fi

   new_version="$major.$minor.$patch-rc$(( $release_candidate+1 ))"
   echo "Release candidate: bumped version to $new_version"
   semver_update $new_version
fi

new_version="$major.$minor.$patch"

if [[ "$message" == "fix("* ]]; then
   if [[ -z $release_candidate ]]; then
      new_version="$major.$minor.$(( $patch+1 ))"
   fi
   echo "Fix: bumped version to $new_version" 
   semver_update $new_version
fi

if [[ "$message" == "feat("* ]]; then
   if [[ -z $release_candidate ]]; then
      new_version="$major.$(( $minor+1 )).0"
   fi
   echo "Feature: bumped version to $new_version" 
   semver_update $new_version
fi

if [[ "$message" == "perf("* || "$message" == "BREAKING CHANGE: "* || "$message" == "break("* ]]; then
   if [[ -z $release_candidate ]]; then
      new_version="$(( $major+1 )).0.0"
   fi
   echo "Breaking: bumped version to $new_version"
   semver_update $new_version
fi

post-commit

#!/bin/sh
#
# An example hook script to prepare a packed repository for use over
# dumb transports.
#
# To enable this hook, rename this file to "post-update".

# exec git update-server-info

root_dir=`git rev-parse --show-toplevel`
if [ -f $root_dir/.git/.semver.newver ]; then
   version="`cat $root_dir/.git/.semver.newver`"
   rm $root_dir/.git/.semver.newver &> /dev/null
   git commit -a -m "Release $version" --no-verify &> /dev/null
   git tag "$version"
fi

Semver - git hook usage

1. Enter your git repository
2. Enter `.git/hooks`
3. Paste scripts or extend existing ones

You may want to change `semver_update` function within `commit-msg`. Feel free to change versions in other files than README.md

RESOLVED Known issue: tagging is broken