#!/bin/bash
# Make Changelog original made by izdubar for Mercurial
# Update for GIT by Caio99BR <caiooliveirafarias0@gmail.com>

(cat << EOF) > /tmp/DETAILED_CHANGELOG
Automatically Generated by make_changelog.sh. DO NOT EDIT

-----------------------------------------------------------------------------

  Copyright 2009-2010, Ifcaro & jimmikaelkael
  Licenced under Academic Free License version 3.0
  Review Open PS2 Loader README & LICENSE files for further details.

-----------------------------------------------------------------------------

Open PS2 Loader Detailed ChangeLog:

EOF

while true
do
# Check if it have .git folder
if ! [ -d .git ]
then
 echo "No .git folder found, exiting..."
 break
fi

# Store author, commit and date on temp file
git log --pretty=format:"%>(18,trunc)%ci%h - %<(18)%an %s" > /tmp/commit_summary
if [ "${?}" != "0" ]
then
 echo "Git command failed, exiting..."
 break
fi

# Hack for fix first commit not showed
printf '\n' >> /tmp/commit_summary

# Store number of commits
old_number_commits=$(($(grep "rev" < OLD_DETAILED_CHANGELOG | head -1 | cut -d " " -f 1 | cut -c 4-)))
number_commits=$(wc -l < /tmp/commit_summary)
new_number_commits=$((number_commits - old_number_commits + 2))

# Echo it!
echo "Current Revision ${number_commits} (Of BitBucket r${old_number_commits} + Of GIT r${new_number_commits})"

# Store author, commit and date on temp file
git log -${new_number_commits} --pretty=format:"%>(18,trunc)%ci%h - %<(32)%an %s" > /tmp/commit_summary
if [ "${?}" != "0" ]
then
 echo "Git command failed, exiting..."
 break
fi

# Hack for fix first commit not showed
printf '\n' >> /tmp/commit_summary

# Reverse commit history
gawk '{ L[n++] = $0 } END { while(n--) print L[n] }' /tmp/commit_summary > /tmp/commit_summary_reverse

# Store each commit in one variable[list]
while read line_commit_summary
do
 old_number_commits=$((old_number_commits + 1))
 echo "rev${old_number_commits} - ${line_commit_summary}" >> /tmp/commit_summary_new
done < /tmp/commit_summary_reverse

# Reverse commmit history again
gawk '{ L[n++] = $0 } END { while(n--) print L[n] }' /tmp/commit_summary_new > /tmp/commit_summary

# Finish it
cat /tmp/DETAILED_CHANGELOG /tmp/commit_summary > DETAILED_CHANGELOG

# Clean it
rm -fr /tmp/commit_summary* /tmp/DETAILED_CHANGELOG*

# Echo it again!
echo "Add ${new_number_commits} revisions of GIT to DETAILED_CHANGELOG created."

# Exit
break
done