b2code-package-tag

#!/bin/bash

# check for help option
if [ "$1" = "--help" -o "$1" = "-h" -o "$1" = "-?" ]; then
  echo
  echo "Usage: `basename $0` [\"major\"/\"minor\"/\"patch\"(=default)/tag]"
  echo
  echo "- This command tags the current version of the source code of a package"
  echo "  and pushes the tag to the central repository."
  echo "  It has to be called in the package directory of the local release."
  echo "  There should be no locally modified files."
  echo "- If no argument is given, the tag name is chosen automatically by"
  echo "  increasing the patch level number, e.g. from v01-01-01 to v01-01-02."
  echo "- If \"minor\" is given as argument, the minor version number is increased,"
  echo "  e.g. from v01-01-01 to v01-02-01."
  echo "- If \"major\" is given as argument, the major version number is increased,"
  echo "  e.g. from v01-01-01 to v02-01-01."
  echo "- Alternatively the name of the tag can be given explicitly as argument."
  echo
  exit 0
fi

# check number of arguments
if [ $# -gt 1 ]; then
  echo "Usage: `basename $0` [\"major\"/\"minor\"/\"patch\"(=default)/tag]" 1>&2
  exit 1
fi

# determine package name
PACKAGE=`pwd | awk -F/ '{print $NF}'`
if [ ! -f  ../.release ]; then
  echo "Error: Not in a package directory." 1>&2
  exit 1
fi

# check whether there are no changes
git diff-files --quiet
if [ "$?" != "0" ]; then
  echo "Error: There are modified files." 1>&2
  exit 1
fi

# check whether there are unpushed commits
UNPUSHED=`git rev-list origin..HEAD | wc -l`
if [ "$UNPUSHED" != "0" ]; then
  echo "Error: There are unpushed commits." 1>&2
  exit 1
fi

# determine revision of previous tag
DIFFREV=`git for-each-ref --format '%(refname)' refs/tags/${PACKAGE}-* | tail -1`
if [ "${DIFFREV}" != "" ]; then
  DIFFREV=${DIFFREV}..
fi

# report changes with respect to previous tag
git log ${DIFFREV} .

# read arguments
TAG=patch
if [ $# -gt 0 ]; then
  TAG=$1
fi

# determine tag
if [ "${TAG}" = "major" -o "${TAG}" = "minor" -o "${TAG}" = "patch" ]; then

  # determine last tag
  LASTTAG=`git for-each-ref --format '%(refname)' refs/tags/${PACKAGE}-??-??-?? | sed "s;refs/tags/${PACKAGE}-;;g" |tail -1`
  if [ "${LASTTAG}" = "" ]; then
    LASTTAG=00-00-00
  fi

  # determine version numbers
  declare -i PATCH
  if [ "`echo ${LASTTAG} | cut -c 7`" = "0" ]; then
    PATCH=`echo ${LASTTAG} | cut -c 8`
  else
    PATCH=`echo ${LASTTAG} | cut -c 7,8`
  fi
  if [ "${TAG}" = "patch" ]; then
    let PATCH+=1
  fi
  declare -i MINOR
  if [ "`echo ${LASTTAG} | cut -c 4`" = "0" ]; then
    MINOR=`echo ${LASTTAG} | cut -c 5`
  else
    MINOR=`echo ${LASTTAG} | cut -c 4,5`
  fi
  if [ "${TAG}" = "minor" ]; then
    let MINOR+=1
    let PATCH=0
  fi
  declare -i MAJOR
  if [ "`echo ${LASTTAG} | cut -c 1`" = "0" ]; then
    MAJOR=`echo ${LASTTAG} | cut -c 2`
  else
    MAJOR=`echo ${LASTTAG} | cut -c 1,2`
  fi
  if [ "${TAG}" = "major" ]; then
    let MAJOR+=1
    let MINOR=0
    let PATCH=0
  fi

  TAG=`printf "%02d-%02d-%02d" ${MAJOR} ${MINOR} ${PATCH}`
fi

# get summary and make tag
echo "Please enter the summary of changes and then hit CTRL-D:"
git tag -F - ${PACKAGE}-${TAG}
if [ "$?" == "0" ]; then
  echo "Committed tag ${TAG} of ${PACKAGE}."
else
  echo "Error: Committing tag ${TAG} failed"
  exit 1
fi

# push tag
git push origin tags/${PACKAGE}-${TAG}
if [ "$?" == "0" ]; then
  echo "Pushed tag ${TAG} of ${PACKAGE}."
else
  echo "Error: Pushing tag ${TAG} failed"
  exit 2
fi