#!/bin/bash

# bash version of desired functionality for drush - see http://drupal.org/node/434944
# autor: Vladimir Radulovski (rsvelko) - http://segments.at
# version 1.0
# - fixed current version detection


projects=$@ # drupal, cck, zen ...


# if in a Drupal dir
if [[ -d ./sites/all/modules ]]
then :
else echo "not in drupal dir. Exiting..."; exit
fi





if [[ -z $projects ]]
then projects="drupal"
fi


############# Requirements

# This script requires that you have drush/link to drush in your $PATH
if [[ -z `which drush` ]]
then echo "drush not found in PATH! Exiting..."; exit 2
fi



############ funcs

function __dru_rm_from_both_core_dirs {
  echo 
  rm -dr $orig/$1 $new/$1 && echo "OK: Done a : rm -dr $orig/$1 $new/$1"

}

function __dru_cp_from_curr_to_both_core_dirs {
echo
  for dest in $orig $new
  do
    for src in "$@"
    do

if [[ -e "$curr/$src" ]] # -e checks for both files and dirs
then cp -pr "$curr/$src" "$dest/" && echo "OK: Done a: cp -pr '$curr/$src' '$dest/'"
fi

    done
  done
echo "
OK: So, now the current core is ready for diffing and the latest core is almost ready to go live."
}




function __dru_get_the_latest_stable_project_version {
  drush info $proj | grep "$proj" | awk '{print $2}'  | grep -v "\-rc" | grep -v "\-alpha" | grep -v "\-beta" | grep -v "\-dev" | head -1
}


function __dru_get_the_current_project_version {
local curr_v output
if [[ $proj == "drupal" ]]
then # drupal
# Drupal version from CHANGELOG.txt of the site we update

  if [[ -f CHANGELOG.txt ]]
  then curr_v=`cat CHANGELOG.txt  | grep "^Drupal" | sed 's/\,.*$//' | sed 's/Drupal\ //' | head -1`
  fi


  if [[ -z $curr_v ]] # can be empty (-z) either because CHANGELOG.txt missing or corrupt
  then echo "Unable to get Drupal site version. Maybe you are not in its root dir?. Exiting..."; exit 1;
  fi
  echo "$curr_v"

else # some contrib proj
output=`find sites/all/${proj_type}s/$proj/ -name "*\.info*"  -exec grep 'version = ' '{}' \;`
echo "$output" | head -1 | tr -d '"' | sed 's/version = //'

fi


}


###################################################################3


for proj in $projects
do

########### determine versions

echo "All releases for $proj:"
drush info $proj

proj_type_suggestion="module"


if [[ $proj != "drupal" ]]
then
echo -n "
Project '$proj' has type ( write module or theme ) ? [$proj_type_suggestion]: "
read proj_type          #"$(__dru_get_curr_project_version $proj)"
if [[ $proj_type == "" ]]
then proj_type=$proj_type_suggestion
fi

fi

#echo $proj_type; exit


new_v_suggestion=$(__dru_get_the_latest_stable_project_version)
curr_v_suggestion=$(__dru_get_the_current_project_version)


echo -n "
Current version of project '$proj' ( suggestion guessed by parsing sites/all/${proj_type}s/$proj/*.info or CHANGELOG.txt for drupal core ) [$curr_v_suggestion]: "
read curr_v          #"$(__dru_get_curr_project_version $proj)"
if [[ $curr_v == "" ]]
then curr_v=$curr_v_suggestion
fi



echo -n "Enter latest version of project '$proj' [$new_v_suggestion]: "
read new_v          #"$(__dru_get_curr_project_version $proj)"
if [[ $new_v == "" ]]
then new_v=$new_v_suggestion
fi

#echo "curr=$curr_v | new=$new_v"


############### download orig and new


drupal_updates_dir="/tmp/drupal_updates_${proj}_"`date +'%F %T' | tr ' ' '_' | tr ':' '-'`
echo "OK: Removing $drupal_updates_dir  - it is timestamped but just in case..."
rm -fdr $drupal_updates_dir && echo "OK: Removed. Creating it again."
mkdir   $drupal_updates_dir


if [[ $proj == "drupal" ]]
then curr=`pwd` # dir of curr site
else curr=`pwd`/sites/all/$proj_type/$proj
fi

orig=$drupal_updates_dir/${proj}-$curr_v
new=$drupal_updates_dir/${proj}-$new_v



#pwd

# We have 3 dirs in this show - current site, drupal core with the same version and latest drupal core

echo "
OK: Your project is at                                  : $curr
OK: Freshly dl-ed project with the same version is at   : $orig
OK: Freshly dl-ed project with the LATEST version is at : $new
OK: the working directory (a.k.a. '.') is               : `pwd`
"

#################### if proj=core auto-resolve the sites diff, as well as the backup and cache dirs


drush dl --destination=$drupal_updates_dir ${proj}-$curr_v; 
if [[ $proj != "drupal" ]]
then mv $drupal_updates_dir/$proj $drupal_updates_dir/${proj}-$curr_v
fi

drush dl --destination=$drupal_updates_dir ${proj}-$new_v; 
if [[ $proj != "drupal" ]]
then mv $drupal_updates_dir/$proj $drupal_updates_dir/${proj}-$new_v
fi

#__dru_rm_from_both_core_dirs    sites  && echo "OK: removed sites from untouched core versions cause we will put our live site's 'sites' dir there"
#__dru_cp_from_curr_to_both_core_dirs   sites backup cache



################## now do an interactive diff reolution - some things deleted, others copied , others left alone = hacks left to reside in the new version
######## the last diff should be NULL = dirs match exactly


diff_type_suggestion="s"
echo "

s: the normal shell diff
g: graphical with kdiff3"
echo -n "What kind of diff do you want? [$diff_type_suggestion]: "
read diff_type
if [[ $diff_type == "" ]]
then diff_type=$diff_type_suggestion
fi


if [[ $diff_type == "g" ]]
then kdiff3 $orig $curr $new # orig is the base cause evolution is like orig->curr and orig->new
else
diff_command="diff -qr $curr $orig"
diff_output=`$diff_command`

echo "
diff command:
$diff_command

diff output:
------ begin --------
$diff_output
------ end   --------
"
fi


done # end of "proj in $projects"