grows-from.sh

#!/bin/sh
# Show from which one of integration branches does current branch grows from
# (c) Marek `saji` Augustynowicz
#
# INSTALL:
#   git config alias.grows-from '!sh .git/bin/grows-from.sh'
#
# USAGE:
#   git grows-from [<commit>]

DEVEL_BASE="$(  command git merge-base ${1:-HEAD} devel )"
NEXT_BASE="$(   command git merge-base ${1:-HEAD} next )"
MASTER_BASE="$( command git merge-base ${1:-HEAD} master )"

FIRST_BASE=$( command git log --pretty=format:%H --max-count=1 $MASTER_BASE $NEXT_BASE $DEVEL_BASE )

case $FIRST_BASE in
    $DEVEL_BASE  ) echo devel ;;
    $NEXT_BASE   ) echo next ;;
    $MASTER_BASE ) echo master ;;
esac