#!/bin/bash
# Copyright (c) 2006-2007 Mauro Carvalho Chehab (mchehab@infradead.org)
# This code is placed under the terms of the GNU General Public License v2
#
#This script is capable to mass import patches from a mercurial tree
#

if [ "$1" == "" ]; then
	echo "Usage: $0 <url>"
	exit
fi

if [ "$CHECKPATCH" == "" ]; then
	CHECKPATCH="/lib/modules/`uname -r`/build/scripts/checkpatch.pl"
fi

TREE="`echo $1|perl -ne 's|[/]$||; s|^.*[/]||; print $_;'`"

if [[ "`echo $1|grep ^http://`" != "" ]]; then
	SITE="`echo $1|perl -ne 's|[/]$||; print $_;'`"
	echo Pushing from remote site $SITE, tree: $TREE
else
	DIR=$1
	echo "Pushing from local directory $DIR, tree=$TREE"
fi

if [ "$TMP" == "" ]; then
	TMP=/tmp
fi
TMP=$TMP/newpatches
if [ ! -d $TMP ]; then
	mkdir $TMP
else
	rm $TMP/*
fi

if [ "$DIR" != "" ]; then
	CS="`hg outgoing -R $DIR .|grep 'changeset:'|cut -f3 -d:`"
else
	CS="`hg incoming $SITE |grep 'changeset:'|cut -f3 -d:`"
fi

NUM="`echo $CS|wc -w`"
echo Number of patches: $NUM

j=1
for i in $CS; do
	name=$TMP/hg_${TREE}_$(printf %0${#NUM}d ${j}).patch
	echo -n "$name with cs=$i "
	if [ "$DIR" != "" ]; then
		hg export -R $DIR $i >$name
	else
		wget -q -O $name "$SITE?cmd=changeset;node=$i;style=raw"
	fi

	# Do a simple consistency check
	node_id=`cat $name|perl -ne 'if (m/# Node ID (.*)/) { print $1; }'`
	parents="`cat $name|perl -ne 's/(# Parent .*)# Parent/\1/; if (m/# Parent (.*)/) { print "$1 "; }' | perl -ne 's/\s+/ /g; s/^\s+//; s/\s+$//; print $_'`"

	if [ "$old_id" != "" ]; then
		if [ "$parents" == "$old_id" ]; then
			echo "Ok."
		else
			newname="$TMP/hg_${TREE}_$(printf %0${#NUM}d ${j}).merge"

			echo "Nok/Merge:"
			echo -e "\t\tOld node ID: $old_id"
			echo -e "\t\tNode parents $parents"
			echo -e "\t\tRenamed to $newname"
			mv $name $newname

			# Avoids incrementing if rename happens
			j=$((j-1))
		fi
	else
		last="`hg log -r -1|grep changeset`"
		par="`hg log -r $parents|grep changeset`"

		if [ "$last" == "$par" ]; then
			echo "First against tip."
		else
			echo "First patch."
			echo -e "Patch against an older patch:"
			hg log -r $parents
		fi
	fi

	old_id=$node_id;
	j=$((j+1))
done

echo "Diffstat of the imported series:"
diffstat -w 72 -p1 $TMP/hg_${TREE}_*.patch

for i in $TMP/*.patch; do
	err="`$CHECKPATCH -q --notree $i`"

	if [ "$err" != "" ]; then
		echo "$i:`grep -v \# $i |head -2`"
		$CHECKPATCH -q --notree $i
		echo
	fi
done

echo To cherry pick all files, you can do something like:
echo "for i in $TMP/*.patch; do ./mailimport \$i; done"
echo "To merge it, the better is to do:"
echo "hg pull $1 && hg merge && hg commit && make && hg push"