#!/bin/bash
#
# Copyright (c) 2007-2008
#         The Xfce development team. All rights reserved.
#
# Written for Xfce by Jannis Pohlmann <jannis@xfce.org>.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# xdt-commit - Part of the Xfce developer tools.
#


##
## Check what kind of repo we have
##
if [ -d .git ]; then
  repo_type=git
elif [ -d .svn ]; then
  repo_type=svn
else
  echo "This doesn't appear to be the root of a versioned source tree." >&2
  exit 1
fi


##
## Check if needed tools are installed
##
if [ "$repo_type" = "git" ]; then
  if ! type git &>/dev/null; then
    echo "Git needs to be installed." >&2
    exit 1
  fi
elif [ "$repo_type" = "svn" ]; then
  if ! type svn &> /dev/null; then
    echo "Subversion needs to be installed." >&2
    exit 1
  fi

  ##
  ## Check if we are in a versioned directory
  ##
  if ! svn info &> /dev/null; then
    echo "Current working directory is not versioned." >&2
    exit 1
  fi
fi


##
## Files to be committed
##
FILES=$*


##
## Detect all ChangeLog's inside this directory by scanning it 
## recursively
##
CHANGELOGS=$(find . -type f -iname ChangeLog | sed 's:^\./::')


##
## Append parsed diff output of each ChangeLog to the commit message
##
for CHANGELOG in $CHANGELOGS; do
  # Make sure the file exists
  if [ -f "$CHANGELOG" ]; then
    if [ "$repo_type" = "svn" ]; then
      # Determine SVN status
      STATUS=$(svn status "${CHANGELOG}")
      if [ -z "$STATUS" ]; then
        STATUS='?'
      fi
    elif [ "$repo_type" = "git" ]; then
      # Determine git status, and fake it into svn-style status
      STATUS=$(git status | grep -E "(modified|new file):[[:space:]]+${CHANGELOG}")
      [ "$STATUS" ] || STATUS='?'  # signal no changes or not versioned
    fi

    # Check if file is versioned
    if [ "$STATUS" != "?" ]; then
      # Add changelog to the commit
      if [ "$repo_type" = "git" ]; then
        git add "${CHANGELOG}"
      fi

      # Parse output
      if [ "$repo_type" = "svn" ]; then
        MSG=$(svn diff "${CHANGELOG}")
      elif [ "$repo_type" = "git" ]; then
        MSG=$(git diff --cached "${CHANGELOG}")
      fi
      MSG=$(echo "$MSG" | awk '/^+\t/' | sed 's/^+//')

      # Append to commit message (and insert newline between ChangeLogs)
      if [ -z "$COMMIT_MSG" ]; then
        COMMIT_MSG="$MSG"
      else
        COMMIT_MSG=$(echo "$COMMIT_MSG"$'\n'"$MSG")
      fi
    fi
  fi
done


##
## Commit changes. If the commit message generate from the ChangeLog 
## files is empty, ask the user to enter a commit message himself
##
if [ -n "$COMMIT_MSG" ]; then
  if [ "$repo_type" = "svn" ]; then
    svn commit $FILES -m "$COMMIT_MSG"
  elif [ "$repo_type" = "git" ]; then
    git commit $FILES -m "$COMMIT_MSG"
  fi
else
  if [ "$repo_type" = "svn" ]; then
    svn commit $FILES
  elif [ "$repo_type" = "git" ]; then
    git commit $FILES
  fi
fi