MAKEALL: Add -m/-M option to determine maintainers

The -m option tries to find the board in MAINTAINERS file and figure out the
email. The -M option lists boards including their maintainers emails and all
affiliated emails. There are multiple strategies used to retrieve these emails:

1) Check board/<boardname> with git log and use three most recent emails
2) Check board/<boardname> with git log and use three most used emails
3) Try finding board in MAINTAINERS file and retrieve all emails from there

The result is then sorted and unique results are retrieved and reported.

For -m option, only strategy 3) is used.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>

MAKEALL

@@ -17,6 +17,8 @@ usage()
 	  -v VENDOR, --vendor VENDOR   Build all boards with vendor VENDOR
 	  -s SOC,    --soc SOC         Build all boards with soc SOC
 	  -l,        --list            List all targets to be built
+	  -m,        --maintainers     List all targets and maintainer email
+	  -M,        --mails           List all targets and all affilated emails
 	  -h,        --help            This help output
 
 	Selections by these options are logically ANDed; if the same option
@@ -48,8 +50,8 @@ usage()
 	exit ${ret}
 }
 
-SHORT_OPTS="ha:c:v:s:l"
-LONG_OPTS="help,arch:,cpu:,vendor:,soc:,list"
+SHORT_OPTS="ha:c:v:s:lmM"
+LONG_OPTS="help,arch:,cpu:,vendor:,soc:,list,maintainers,mails"
 
 # Option processing based on util-linux-2.13/getopt-parse.bash
 
@@ -67,6 +69,8 @@ eval set -- "$TEMP"
 
 SELECTED=''
 ONLY_LIST=''
+PRINT_MAINTS=''
+MAINTAINERS_ONLY=''
 
 while true ; do
 	case "$1" in
@@ -109,6 +113,15 @@ while true ; do
 	-l|--list)
 		ONLY_LIST='y'
 		shift ;;
+	-m|--maintainers)
+		ONLY_LIST='y'
+		PRINT_MAINTS='y'
+		MAINTAINERS_ONLY='y'
+		shift ;;
+	-M|--mails)
+		ONLY_LIST='y'
+		PRINT_MAINTS='y'
+		shift ;;
 	-h|--help)
 		usage ;;
 	--)
@@ -483,11 +496,107 @@ LIST_nds32="$(boards_by_arch nds32)"
 
 #-----------------------------------------------------------------------
 
+get_target_location() {
+	local target=$1
+	local BOARD_NAME=""
+	local CONFIG_NAME=""
+	local board=""
+	local vendor=""
+
+	# Automatic mode
+	local line=`egrep -i "^[[:space:]]*${target}[[:space:]]" boards.cfg`
+
+	if [ -z "${line}" ] ; then echo "" ; return ; fi
+
+	set ${line}
+
+	# add default board name if needed
+	[ $# = 3 ] && set ${line} ${1}
+
+	CONFIG_NAME="${1%_config}"
+
+	[ "${BOARD_NAME}" ] || BOARD_NAME="${1%_config}"
+
+	if [ "$4" = "-" ] ; then
+		board=${BOARD_NAME}
+	else
+		board="$4"
+	fi
+
+	[ $# -gt 4 ] && [ "$5" != "-" ] && vendor="$5"
+	[ $# -gt 6 ] && [ "$7" != "-" ] && {
+		tmp="${7%:*}"
+		if [ "$tmp" ] ; then
+			CONFIG_NAME="$tmp"
+		fi
+	}
+
+	# Assign board directory to BOARDIR variable
+	if [ -z "${vendor}" ] ; then
+	    BOARDDIR=${board}
+	else
+	    BOARDDIR=${vendor}/${board}
+	fi
+
+	echo "${CONFIG_NAME}:${BOARDDIR}"
+}
+
+get_target_maintainers() {
+	local name=`echo $1 | cut -d : -f 1`
+
+	if ! grep -qsi "[[:blank:]]${name}[[:blank:]]" MAINTAINERS ; then
+		echo ""
+		return ;
+	fi
+
+	local line=`tac MAINTAINERS | grep -ni "[[:blank:]]${name}[[:blank:]]" | cut -d : -f 1`
+	local mail=`tac MAINTAINERS | tail -n +${line} | \
+		sed -n ":start /.*@.*/ { b mail } ; n ; b start ; :mail /.*@.*/ { p ; n ; b mail } ; q" | \
+		sed "s/^.*<//;s/>.*$//"`
+	echo "$mail"
+}
+
+list_target() {
+	if [ "$PRINT_MAINTS" != 'y' ] ; then
+		echo "$1"
+		return
+	fi
+
+	echo -n "$1:"
+
+	local loc=`get_target_location $1`
+
+	if [ -z "${loc}" ] ; then echo "ERROR" ; return ; fi
+
+	local maintainers_result=`get_target_maintainers ${loc} | tr " " "\n"`
+
+	if [ "$MAINTAINERS_ONLY" != 'y' ] ; then
+
+		local dir=`echo ${loc} | cut -d ":" -f 2`
+		local cfg=`echo ${loc} | cut -d ":" -f 1`
+		local git_result=`git log --format=%aE board/${dir} \
+				include/configs/${cfg}.h | grep "@"`
+		local git_result_recent=`echo ${git_result} | tr " " "\n" | \
+						head -n 3`
+		local git_result_top=`echo ${git_result} | tr " " "\n" | \
+			sort | uniq -c | sort -nr | head -n 3 | \
+			sed "s/^ \+[0-9]\+ \+//"`
+
+		echo -e "$git_result_recent\n$git_result_top\n$maintainers_result" | \
+			sort -u | tr "\n" " " | sed "s/ $//" ;
+	else
+		echo -e "$maintainers_result" | sort -u | tr "\n" " " | \
+						sed "s/ $//" ;
+	fi
+
+	echo ""
+}
+
 build_target() {
 	target=$1
 
 	if [ "$ONLY_LIST" == 'y' ] ; then
-		echo "$target"
+		list_target ${target}
 		return
 	fi