#!/bin/sh
#
# Updates you git.git clone, recompiles, installs and activates the latest
# version
#

# Set this to the place where git.git clone is at
# in you local filesystem
GIT_CLONE_DIR=$HOME/Documents/work/track/git

# Where all the git versions will be placed
# Each version will be inside a directory, like git-v1.5.6.1-204-g6991357
# Current active version will be a symblink 'git'
# so you can add $BASE/git/bin to your PATH
BASE=/usr/local

### Nothing more to tweak ###

## local::lib installs might mess up with /usr/bin/perl
## if you have another perl on your path
unset PERL_MM_OPT
unset PERL5LIB

cd $GIT_CLONE_DIR
if [ $? != 0 ] ; then
	echo
	echo "** FATAL **: could not chdir to GIT_CLONE_DIR $GIT_CLONE_DIR"
	echo "Edit this script and tell me where the git.git clone is"
	exit 1
fi

# Allow for -t to force a make test
# I should learn to use getopt with sh really
run_tests=
if [ "$1" == "-t" ] ; then
  run_tests=yes
fi

echo
echo "This script will pull the lastest git.git master branch, recompile,"
echo "install and activate."
echo
echo "Sure? [y/N]"

read confirmation

if [ "$confirmation" != "y" ] ; then exit ; fi

if [ -e configure ] ; then
  make distclean
fi

git pull

version=`git describe --always`

if [ -z "$DOIT" -a -d "$BASE/git-$version" ] ; then
	echo
	echo "**** You already have the latest git version ($version) installed"
	echo
	exit 0
fi

echo
echo "******* Compiling version $version"
echo

PERL_PATH="/usr/bin/env perl"
export PERL_PATH

make configure
./configure --prefix=$BASE/git-$version
make -j6 all
if [ $? != 0 ] ; then
  echo "******* Compilation failed! "
  exit 1
fi

if [ "$run_tests" == "yes" ] ; then
  echo
  echo "******* Installing git and documentation"
  echo
  
  make test
fi

echo
echo "******* Installing git and documentation"
echo

sudo make install
sudo make quick-install-doc


echo
echo "******* Cleanup phase"
echo

make distclean


echo
echo "******* Check environment"
echo

check_path=`echo $PATH | perl -pe 's/:/\n/g' | egrep ^$BASE/git/bin$`
if [ -z "$check_path" ] ; then
  echo
  echo "WARNING: your PATH must be changed to include"
  echo
  echo "      $BASE/git/bin"
  echo
fi

check_manpath=`echo $MANPATH | perl -pe 's/:/\n/g' | egrep ^$BASE/git/share/man$`
if [ -z "$check_manpath" ] ; then
  echo
  echo "WARNING: your MANPATH must be changed to include"
  echo
  echo "      $BASE/git/share/man"
  echo
fi

echo
echo Current git version: `readlink $BASE/git`
echo Switching to version: git-$version
echo

sudo sh -c "cd $BASE; rm -f git; ln -s git-$version git"

echo
echo "You are running verion (running git -v now):"
echo
git --version