#!/bin/bash
AUTO=0

# Prevent environment leakage to these vars.
unset TO
unset CC

usage()
{
cat <<EOM
Usage: $(basename $0) [-h] [-a] [[-t email]...] -p pull-dir 
  -t email     Explicitly add email to the recipients
  -a           Automatically harvest recipients from "*-by: email" lines
               in the patches in the pull-dir
  -p pull-dir  Directory containing summary and patch files
EOM
}

# Collect To and CC addresses from the patch files if they exist
# $1: Which header to add the recipients to, "TO" or "CC"
# $2: The regex to match and strip from the line with email addresses
harvest_recipients()
{
	TO_CC=$1
	REGX=$2
	export IFS=$',\n'
	for PATCH in $PDIR/*.patch; do
		# Grab To addresses
		for EMAIL in $(sed '/^---$/q' $PATCH | grep -e "$REGX" | sed "s/$REGX//"); do
			if [ "$TO_CC" == "TO" ] && [ "${TO/$EMAIL/}" == "$TO" ] && [ -n "$EMAIL" ]; then
				if [ -z "$TO" ]; then TO=$EMAIL; else TO="$TO,$EMAIL"; fi
			elif [ "$TO_CC" == "CC" ] && [ "${CC/$EMAIL/}" == "$CC" ] && [ -n "$EMAIL" ]; then
				if [ -z "$CC" ]; then CC=$EMAIL; else CC="$CC,$EMAIL"; fi
			fi
		done
	done
	unset IFS
}


# Parse and verify arguments
while getopts "ahp:t:" OPT; do
	case $OPT in
	a)
		AUTO=1
		;;
	h)
		usage
		exit 0
		;;
	p)
		PDIR=${OPTARG%/}
		if [ ! -d $PDIR ]; then
			echo "ERROR: pull-dir \"$PDIR\" does not exist."
			usage
			exit 1
		fi
		;;
	t)
		if [ -n "$TO" ]; then
			TO="$TO,$OPTARG"
		else
			TO="$OPTARG"
		fi
		;;
	esac
done

if [ -z "$PDIR" ]; then
	echo "ERROR: you must specify a pull-dir."
	usage
	exit 1
fi


# Verify the cover letter is complete and free of tokens
CL="$PDIR/0000-cover-letter.patch"
for TOKEN in SUBJECT BLURB; do
	grep -q "*** $TOKEN HERE ***" "$CL"
	if [ $? -eq 0 ]; then
		echo "ERROR: Please edit $CL and try again (Look for '*** $TOKEN HERE ***')."
		exit 1
	fi
done


# Harvest emails from the generated patches and populate the TO and CC variables
# In addition to To and CC headers/lines, the common Signed-off-by, Tested-by,
# etc. (*-by) will be added to CC.
if [ $AUTO -eq 1 ]; then
	harvest_recipients TO "^[Tt][Oo]: *"
	harvest_recipients CC "^[Cc][Cc]: *"
	harvest_recipients CC "^[A-Z][A-Za-z-]*-[Bb][Yy]: *"
fi

AUTO_TO="$(git config sendemail.to)"
if [ -n "$AUTO_TO" ]; then
	if [ -n "$TO" ]; then
		TO="$TO,$AUTO_TO"
	else
		TO="$AUTO_TO"
	fi
fi

if [ -z "$TO" ] && [ -z "$CC" ]; then
	echo "ERROR: you have not specified any recipients."
	usage
	exit 1
fi


# Generate report for the user and require confirmation before sending
cat <<EOM
The following patches:
$(for PATCH in $PDIR/*.patch; do echo "    $PATCH"; done)

will now be sent via the git send-email command.

EOM
echo "Continue? [y/N] "
read cont

if [ "$cont" == "y" ] || [ "$cont" == "Y" ]; then
	ERROR=0
	export IFS=$','
	GIT_TO=$(for R in $TO; do echo -n "--to='$R' "; done)
	GIT_CC=$(for R in $CC; do echo -n "--cc='$R' "; done)
	unset IFS
	for PATCH in $PDIR/*patch; do
		# We harvest the emails manually, so force git not to.
		eval "git send-email $GIT_TO $GIT_CC --no-chain-reply-to --suppress-cc=all $PATCH"
		if [ $? -eq 1 ]; then
			ERROR=1
		fi
	done

	if [ $ERROR -eq 1 ]; then
		echo "ERROR: Failed to send one or more messages."
	fi
else
	echo "Send aborted."
fi