#!/bin/sh -

vim=${VIMCMD-vim}

# colorize - create a .html version of a text file with vim gui syntax coloring
# Steve Kinzler, steve@kinzler.com, Dec 98/May 00
# https://kinzler.com/me/home.html#web

# Bugs: vim's 2html can screw up when there's control characters in the
#       input file, eg <C-A>

# Note: {Text,Apache}::VimColor are now available including text-vimcolor(1),
#	have lots of module dependencies; using this is an alternative
# Note: there's probably a better way to do this even with vim still now
# Note: https://github.com/sharkdp/bat may be a good option now

bad=; f=; s=on; bkgd=; scheme=

while :
do
	case $# in
	0)	break;;
	*)	case "$1" in
		-f)	f=f;;
		-s)	s=off;;
		-d)	bkgd='se bg=dark|';;
		-l)	bkgd='se bg=light|';;
		-c)	shift; scheme="$1";;

		--)	shift; break;;
		-h)	bad=t;;
		-)	break;;
		-*)	bad=t; echo "$0: unknown option ($1)" 1>&2;;
		*)	break;;
		esac
		shift;;
	esac
done

case $# in
1)	test "$1" = - -o -r "$1" ||
		{ echo "$0: no such file ($1)" 1>&2; bad=t; }
	in="$1";;
*)	bad=t;;
esac

set `$vim -version 2>&1 | sed 's/\( [0-9][0-9]*\.[0-9][0-9]*\).*/\1/
			       s/.* //; s/\./ /g; 1q'` 0 0
vers=`expr $1 \* 100 + $2`
test $vers -lt 502 && { echo "$0: vim ($vim) version < 502 ($vers)" 1>&2;
			exit 4; }

case "$bad" in
?*)	cat << EOF 1>&2
usage: $0 [ -f ] [ -s ] [ -d | -l ] [ -c name ] { file | - }
file.html or Untitled.html is created which includes vim gui syntax coloring
	-f	overwrite an existing file.html
	-s	suppress syntax coloring/highlighting
	-d	use a dark background
	-l	use a light background
	-c	use the given vim color scheme
EOF
	exit 1;;
esac

case "$in" in
-)	out=Untitled.html;;
*)	out="$in.html";;
esac
test "$f" = '' -a \( -f "$out" -o -d "$out" \) &&
	{ echo "$0: output file already exists ($out)" 1>&2; exit 2; }
>> "$out" || exit 3

case "$in" in
-)	ddash=;;
*)	ddash=--;;
esac

syndir=VIMRUNTIME
test $vers -lt 504 && syndir=VIM

case "$scheme" in
?*)	scheme="|so \$$syndir/colors/$scheme.vim";;
esac

$vim -c "${bkgd}syn $s$scheme|so \$$syndir/syntax/2html.vim|w|qa!" \
	$ddash "$in" 2>&1 > /dev/null | grep -v 'not.* a terminal'