mblaze/mless

#!/bin/sh
# mless [MSG] - less(1)-wrapper around mshow

PATH="${0%/*}:$PATH"

colorscan() {
awk '
function fg(c, s) { return sprintf("\033[38;5;%03dm%s\033[0m", c, s) }
function so(s) { return sprintf("\033[1m%s\033[0m", s) }
/^>/ { print so(fg(119, $0)); next }
/^ *\\_/ { print fg(242, $0); next }
{ print }'
}

if [ "$1" = --filter ]; then
	if [ "$2" = //scan ]; then
		mscan : 2>/dev/null | colorscan
		exit $?
	fi

	mseq -C "$2"
	mscan .-2:.+3 2>/dev/null | colorscan
	echo

	if ! [ -f "$(mseq -r "$2")" ]; then
		mseq "$2"
		exit
	fi

	if [ $MLESS_RAW -eq 0 ]; then
		if [ $MLESS_HTML -eq 1 ]; then
			mshow -A text/html "$2"
		else
			mshow "$2"
		fi | mcolor
	else
		mseq -r $2
		echo
		cat "$(mseq -r $2)"
	fi
	exit $?
fi

if [ "$#" -eq 0 ] && ! [ -t 0 ]; then
	mseq -S >/dev/null
	set -- :
fi

if ! [ -t 1 ]; then
	exec mseq :
fi

case "$0" in
	*mnext) set -- +;;
	*mprev) set -- -;;
	*) [ "$#" -eq 1 ] && set -- ${1:-.};;
esac

if [ "$#" -ge 1 ]; then
	mseq -C "$1"
fi

nl="
"
export MLESS_RAW=0
export MLESS_HTML=0
while :; do
	if [ -f $MBLAZE/mless ]; then
		export LESSKEY=$MBLAZE/mless
	elif [ -f $HOME/.mblaze/mless ]; then
		export LESSKEY=$HOME/.mblaze/mless
	elif [ -f $HOME/.mless ]; then
		export LESSKEY=$HOME/.mless
	fi
	LESSOPEN="|$0 --filter %s" \
		less -Ps"mless %f?m (message %i of %m).." -R \
			"+:e $(mscan -n .)$nl" //scan $(mscan -n :)
	case "$?" in
	0|1) exit $?;;
	78) # N go to next unseen message
		nu=$(magrep -v -m1 :S .:) && mseq -C "$nu"
		;;
	107) # k next thread
		mseq -C "$(mseq .+1: | sed -n '/^[^ <]/{p;q;}')"
		;;
	100) # d mark read
		mflag -S .
		mseq -f : | mseq -S
		mseq -C +
		;;
	82) # R toggle raw mode
		MLESS_RAW=$((1-$MLESS_RAW))
		;;
	72) # H toggle HTML mode
		MLESS_HTML=$((1-$MLESS_HTML))
		;;
	94) # ^ goto parent
		mseq -C '.^' 2>/dev/null
		;;
	esac
done