GLOBAL patch for less.

						Shigio Yamaguchi 2000/12/14

You can use GLOBAL from less viewer with this patch.
You need less-346.

	% cd less-346
	% patch < less-346+gtags.diff
 
This patch enables the following facilities:

o Support multi tag

  New less supports following tag files:
	Traditional tags by ctags.
	Extended tags by Exuberant Ctags <http://ctags.sourceforge.net>
	GLOBAL's tag by global.
	Ctags -x format from stdin.

  User can specify tag file by the -T option.
  By default, Tag file name is "tags". But if the file is not found
  then new less use GTAGS.

	% ls tags
	tags
	% less -t main			-- tag file is 'tags' (default)

	% less -TGTAGS -t main		-- use GTAGS

	% ctags -x *.c | less -T-	-- use ctags -x format from stdin

	% ls tags
	ls: tags: No such file or directory
	% less -t main			-- use GTAGS

  About GLOBAL's tag, GTAGS, GRTAGS, GSYMS and GPATH are available as tag
  file name. User must not specify the path (GLOBAL locate the path instead
  of you.)

  About ctags -x format, both of standard and extended format are supported.

	[standard format]
	<tag>   <lineno>  <file>         <image>
	+------------------------------------------------
	|main     30      main.c         main(argc, argv)
	|func     21      subr.c         func(arg)

	The following commands write this format.
	   o Traditinal Ctags with -x option
	   o Global with -x option

	[extended format]
	<tag>   <type>  <lineno>   <file>        <image>
	+----------------------------------------------------------
	|main     function 30      main.c         main(argc, argv)
	|func     function 21      subr.c         func(arg)

	Exuberant Ctags with -x option write this format.
	See <http://ctags.sourceforge.net>

  Following usages are available with this facility.

        % global -xg 'lseek(.*)' | less -T-	# grep(1) needed.
        % global -xI func | less -T-		# id-utils(1) needed.
        % ctags -x func | less -T-


o Support duplicated tag

  News less also supports duplicated tag entries.
  This facility is supported in all tag files. In traditional tag file,
  it is treated special case that tag is only one.

  At first, less shows the first tag. User can move to the next or previous
  entry by 't'(next) and 'T'(previous) command.

        't'             go to the next entry
        'T'             go to the previous entry

o Rare case spec

  If user invoke examin command while tag structure loaded,
  less cleanup tag structure leaving ifile structure.

	(1)
	% less -t main
	...
	[lessecho.c (tag 1 of 4)]	<- 4 tags found.
					   currently lessecho.c loaded.

	(2)
	Examine: edit.c			<- examine 'edit.c'

	(3)
	...
	[edit.c (file 2 of 2)]		<- insert edit.c in ifile structure.

	(4)
	t				<- go to next tag
	[No next tag  (press RETURN)]	<- no tag structure

  If user use stdin as tag file (by -T- option) and invoke ':t' command
  in less then less use default tag file, that is, 'tags'.
