#!/bin/bash

# Stateless script to create stacked patch series (with guilt) on a specified
# git repository.
#
# Used mostly to help with patch maintenance on xfsprogs project.
#
# The idea is to use it as a hook in neomutt, select a bunch of patches create
# stgit series based on those.
#
# The script relies on b4 tool to create mailboxes from the patches's msg-ids,
# and those mboxes sent to stgi to transform them in patch series.


#Piped message(s)
emails=$2

#Repository to act on
REPO="$1"

patch=/tmp/$$.patch
mbox=/tmp/mutt_mbox.tmp
MBOX_DIR=/tmp/MBOX_DIR

# Logging
IMPORT_LOG=/tmp/$$.import_log

#Commands used
B4=`which b4`
GIT=`which git`
GUILT=`which guilt`


#Repositories location
KERNEL_REPO=$HOME/Source/kernel/linux.pristine
XFSPROGS_REPO=$HOME/Source/xfsprogs/xfsprogs-dev.pristine
XFSDUMP_REPO=$HOME/Source/xfsdump/xfsdump-dev.pristine

cleanup(){
	rm -rf $MBOX_DIR
	rm -rf $IMPORT_LOG
	rm -rf /tmp/*.error_log
}

setup(){
	if [ -d $MBOX_DIR ]; then
		mkdir -p $MBOX_DIR
	fi
}

# Create multiple mboxes from tagged messages
import_from_list(){

	ID_LIST=/tmp/$$.idlist
	ERR_LOG=/tmp/$$_import.error_log

	cat $emails | grep Message-Id | awk '{print $2}'> $ID_LIST

	for i in `cat $ID_LIST`; do
		b4 -q am -t -s -o $MBOX_DIR $i &> $ERR_LOG
	done

	rm $ID_LIST
}

# Import patches from mailboxes into a git branch
create_git_branch(){

	if [ $REPO == "xfsprogs" ]; then
		cd $XFSPROGS_REPO
	elif [ $REPO == "xfsdump" ]; then
		cd $XFSDUMP_REPO
	else
		echo "Invalid repository"
		exit 1
	fi

	for i in `ls $MBOX_DIR | grep ".mbx"`; do
		series=$(echo $i | sed 's/.mbx//')
		ERR_LOG=/tmp/$series.error_log
		#stack=$(echo $i)

		echo "====================="
		echo "- Applying Series:"
		echo "$series"
		echo
		# Ensure we are at for-next branch, to avoid stacking different
		# series in the same branch
		echo "- Creating new Branch:"
		$GIT checkout -q -B IMPORT_$series >> $ERR_LOG
		echo
		echo "- Resetting branch to for-next"
		$GIT reset -q --hard for-next >> $ERR_LOG
		#$GIT checkout -q for-next > $ERR_LOG
		echo
		echo "- Importing commits"
		$GIT am $MBOX_DIR/$i 2>> $ERR_LOG >> $IMPORT_LOG

		#if [ $? != 0 ]; then
		if [ -s $ERR_LOG ]; then
			echo "GIT AM ERROR: Failed to import series: $series"
			#echo "DEBUG: $MBOX_DIR/$i"
			#echo "DEBUG: $PWD"
			echo "See: $ERR_LOG"
			$GIT am --abort >> $IMPORT_LOG
			continue
		else
			echo
			echo "-= SERIES APPLIED =-"
		fi
	done
	echo
	echo "- Moving back to master branch..."
	$GIT checkout -q master >> $ERR_LOG
	echo
	echo "-= Job finished =-"
	echo "====================="
}

show_dialog(){
	dialog --clear --menu "Select reposiroty" 0 0 20 "kernel" "" "xfsprogs" "" 2>&1 >/dev/tty
}


# Prog starts here

cleanup
mkdir $MBOX_DIR
import_from_list $emails
create_git_branch
#create_patch_stacks $XFSPROGS_REPO
#create_patch_stacks $XFSDUMP_REPO