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+"=============================================================================
+" 	     File: folding.vim
+"      Author: Srinath Avadhanula
+"      		   modifications/additions by Zhang Linbo
+" 	      CVS: $Id: folding.vim 997 2006-03-20 09:45:45Z srinathava $
+"     Created: Tue Apr 23 05:00 PM 2002 PST
+" 
+"  Description: functions to interact with Syntaxfolds.vim
+"=============================================================================
+
+nnoremap <unique> <Plug>Tex_RefreshFolds :call MakeTexFolds(1)<cr>
+
+augroup LatexSuite
+	au LatexSuite User LatexSuiteFileType 
+		\ call Tex_Debug('folding.vim: catching LatexSuiteFileType', 'fold') | 
+		\ call Tex_SetFoldOptions()
+augroup END
+
+" Tex_SetFoldOptions: sets maps for every buffer {{{
+" Description: 
+function! Tex_SetFoldOptions()
+	if exists('b:doneSetFoldOptions')
+		return
+	endif
+	let b:doneSetFoldOptions = 1
+
+	setlocal foldtext=TexFoldTextFunction()
+
+	if g:Tex_Folding && g:Tex_AutoFolding
+		call MakeTexFolds(0)
+	endif
+
+	let s:ml = exists('g:mapleader') ? g:mapleader : "\\"
+
+	call Tex_MakeMap(s:ml."rf", "<Plug>Tex_RefreshFolds", 'n', '<silent> <buffer>')
+
+endfunction " }}}
+" Tex_FoldSections: creates section folds {{{
+" Author: Zhang Linbo
+" Description:
+" 	This function takes a comma seperated list of "sections" and creates fold
+" 	definitions for them. The first item is supposed to be the "shallowest" field
+" 	and the last is the "deepest". See g:Tex_FoldedSections for the default
+" 	definition of the lst input argument.
+"
+" 	**works recursively**
+function! Tex_FoldSections(lst, endpat)
+	let i = match(a:lst, ',')
+	if i > 0
+		let s = strpart(a:lst, 0, i)
+	else
+		let s = a:lst
+	endif
+	if s =~ '%%fakesection'
+		let s = '^\s*' . s
+	else
+		let s = '^\s*\\' . s . '\W'
+	endif
+	let endpat = s . '\|' . a:endpat
+	if i > 0
+		call Tex_FoldSections(strpart(a:lst,i+1), endpat)
+	endif
+	let endpat = '^\s*\\appendix\W\|' . endpat
+	call AddSyntaxFoldItem(s, endpat, 0, -1)
+endfunction
+" }}}
+" MakeTexFolds: function to create fold items for latex. {{{
+"
+" used in conjunction with MakeSyntaxFolds().
+" see ../plugin/syntaxFolds.vim for documentation
+function! MakeTexFolds(force)
+	if exists('g:Tex_Folding') && !g:Tex_Folding
+		return
+	endif
+	if &ft != 'tex'
+		return
+	end
+
+	" Setup folded items lists g:Tex_Foldedxxxx
+	" 	1. Use default value if g:Tex_Foldedxxxxxx is not defined
+	" 	2. prepend default value to g:Tex_Foldedxxxxxx if it starts with ','
+	" 	3. append default value to g:Tex_Foldedxxxxxx if it ends with ','
+
+	" Folding items which are not caught in any of the standard commands,
+	" environments or sections.
+	let s = 'item,slide,preamble,<<<'
+	if !exists('g:Tex_FoldedMisc')
+		let g:Tex_FoldedMisc = s
+	elseif g:Tex_FoldedMisc[0] == ','
+		let g:Tex_FoldedMisc = s . g:Tex_FoldedMisc
+	elseif g:Tex_FoldedMisc =~ ',$'
+		let g:Tex_FoldedMisc = g:Tex_FoldedMisc . s
+	endif
+
+	" By default do not fold any commands. It looks like trying to fold
+	" commands is a difficult problem since commands can be arbitrarily nested
+	" and the end patterns are not unique unlike the case of environments.
+	" For this to work well, we need a regexp which will match a line only if
+	" a command begins on that line but does not end on that line. This
+	" requires a regexp which will match unbalanced curly braces and that is
+	" apparently not doable with regexps.
+	let s = ''
+    if !exists('g:Tex_FoldedCommands')
+		let g:Tex_FoldedCommands = s
+	elseif g:Tex_FoldedCommands[0] == ','
+		let g:Tex_FoldedCommands = s . g:Tex_FoldedCommands
+	elseif g:Tex_FoldedCommands =~ ',$'
+		let g:Tex_FoldedCommands = g:Tex_FoldedCommands . s
+	endif
+
+	let s = 'verbatim,comment,eq,gather,align,figure,table,thebibliography,'
+			\. 'keywords,abstract,titlepage'
+    if !exists('g:Tex_FoldedEnvironments')
+		let g:Tex_FoldedEnvironments = s
+	elseif g:Tex_FoldedEnvironments[0] == ','
+		let g:Tex_FoldedEnvironments = s . g:Tex_FoldedEnvironments
+	elseif g:Tex_FoldedEnvironments =~ ',$'
+		let g:Tex_FoldedEnvironments = g:Tex_FoldedEnvironments . s
+	endif
+	
+    if !exists('g:Tex_FoldedSections')
+		let g:Tex_FoldedSections = 'part,chapter,section,%%fakesection,'
+								\. 'subsection,subsubsection,paragraph'
+	endif
+
+	" the order in which these calls are made decides the nestedness. in
+	" latex, a table environment will always be embedded in either an item or
+	" a section etc. not the other way around. so we first fold up all the
+	" tables. and then proceed with the other regions.
+
+	let b:numFoldItems = 0
+
+	" ========================================================================
+	" How to add new folding items {{{
+	" ========================================================================
+	"
+	" Each of the following function calls defines a syntax fold region. Each
+	" definition consists of a call to the AddSyntaxFoldItem() function.
+	" 
+	" The order in which the folds are defined is important. Juggling the
+	" order of the function calls will create havoc with folding. The
+	" "deepest" folding item needs to be called first. For example, if
+	" the \begin{table} environment is a subset (or lies within) the \section
+	" environment, then add the definition for the \table first.
+	"
+	" The AddSyntaxFoldItem() function takes either 4 or 6 arguments. When it
+	" is called with 4 arguments, it is equivalent to calling it with 6
+	" arguments with the last two left blank (i.e as empty strings)
+	"
+	" The explanation for each argument is as follows:
+	"    startpat: a line matching this pattern defines the beginning of a fold.
+	"    endpat  : a line matching this pattern defines the end of a fold.
+	"    startoff: this is the offset from the starting line at which folding will
+	"              actually start
+	"    endoff  : like startoff, but gives the offset of the actual fold end from
+	"              the line satisfying endpat.
+	"              startoff and endoff are necessary when the folding region does
+	"              not have a specific end pattern corresponding to a start
+	"              pattern. for example in latex,
+	"              \begin{section}
+	"              defines the beginning of a section, but its not necessary to
+	"              have a corresponding
+	"              \end{section}
+	"              the section is assumed to end 1 line _before_ another section
+	"              starts.
+	"    startskip: a pattern which defines the beginning of a "skipped" region.
+	"
+	"               For example, suppose we define a \itemize fold as follows:
+	"               startpat =  '^\s*\\item',
+	"               endpat = '^\s*\\item\|^\s*\\end{\(enumerate\|itemize\|description\)}',
+	"               startoff = 0,
+	"               endoff = -1
+	"
+	"               This defines a fold which starts with a line beginning with an
+	"               \item and ending one line before a line beginning with an
+	"               \item or \end{enumerate} etc.
+	"
+	"               Then, as long as \item's are not nested things are fine.
+	"               However, once items begin to nest, the fold started by one
+	"               \item can end because of an \item in an \itemize
+	"               environment within this \item. i.e, the following can happen:
+	"
+	"               \begin{itemize}
+	"               \item Some text <------- fold will start here
+	"                     This item will contain a nested item
+	"                     \begin{itemize} <----- fold will end here because next line contains \item...
+	"                     \item Hello
+	"                     \end{itemize} <----- ... instead of here.
+	"               \item Next item of the parent itemize
+	"               \end{itemize}
+	"
+	"               Therefore, in order to completely define a folding item which
+	"               allows nesting, we need to also define a "skip" pattern.
+	"               startskip and end skip do that.
+	"               Leave '' when there is no nesting.
+	"    endskip: the pattern which defines the end of the "skip" pattern for
+	"             nested folds.
+	"
+	"    Example: 
+	"    1. A syntax fold region for a latex section is
+	"           startpat = "\\section{"
+	"           endpat   = "\\section{"
+	"           startoff = 0
+	"           endoff   = -1
+	"           startskip = ''
+	"           endskip = ''
+	"    Note that the start and end patterns are thus the same and endoff has a
+	"    negative value to capture the effect of a section ending one line before
+	"    the next starts.
+	"    2. A syntax fold region for the \itemize environment is:
+	"           startpat = '^\s*\\item',
+	"           endpat = '^\s*\\item\|^\s*\\end{\(enumerate\|itemize\|description\)}',
+	"           startoff = 0,
+	"           endoff = -1,
+	"           startskip = '^\s*\\begin{\(enumerate\|itemize\|description\)}',
+	"           endskip = '^\s*\\end{\(enumerate\|itemize\|description\)}'
+	"     Note the use of startskip and endskip to allow nesting.
+	"
+	"
+	" }}}
+	" ========================================================================
+	
+	" {{{ comment lines
+	if g:Tex_FoldedMisc =~ '\<comments\>'
+		call AddSyntaxFoldItem (
+			\ '^%\([^%]\|[^f]\|[^a]\|[^k]\|[^e]\)',
+			\ '^[^%]',
+			\ 0,
+			\ -1 
+			\ )
+	endif
+	" }}}
+
+	" {{{ items
+	if g:Tex_FoldedMisc =~ '\<item\>'
+		call AddSyntaxFoldItem (
+			\ '^\s*\\item',
+			\ '^\s*\\item\|^\s*\\end{\(enumerate\|itemize\|description\)}',
+			\ 0,
+			\ -1,
+			\ '^\s*\\begin{\(enumerate\|itemize\|description\)}',
+			\ '^\s*\\end{\(enumerate\|itemize\|description\)}'
+			\ )
+	endif
+	" }}}
+
+	" {{{ title
+	if g:Tex_FoldedMisc =~ '\<title\>'
+		call AddSyntaxFoldItem (
+			\ '^\s*\\title\W',
+			\ '^\s*\\maketitle',
+			\ 0,
+			\ 0
+			\ )
+	endif
+	" }}}
+ 
+	" Commands and Environments {{{
+	" Fold the commands and environments in 2 passes.
+	let pass = 0
+	while pass < 2
+		if pass == 0
+			let lst = g:Tex_FoldedCommands
+		else
+			let lst = g:Tex_FoldedEnvironments
+		endif
+		while lst != ''
+			let i = match(lst, ',')
+			if i > 0
+				let s = strpart(lst, 0, i)
+				let lst = strpart(lst, i+1)
+			else
+				let s = lst
+				let lst = ''
+			endif
+			if s != ''
+				if pass == 0
+					" NOTE: This pattern ensures that a command which is
+					" terminated on the same line will not start a fold.
+					" However, it will also refuse to fold certain commands
+					" which have not terminated. eg:
+					" 	\commandname{something \bf{text} and 
+					" will _not_ start a fold.
+					" In other words, the pattern is safe, but not exact.
+					call AddSyntaxFoldItem('^\s*\\'.s.'{[^{}]*$','^[^}]*}',0,0)
+				else
+					call AddSyntaxFoldItem('^\s*\\begin{'.s,'^\s*\\end{'.s,0,0)
+				endif
+			endif
+		endwhile
+		let pass = pass + 1
+	endwhile
+	" }}}
+
+	" Sections {{{
+	if g:Tex_FoldedSections != '' 
+		call Tex_FoldSections(g:Tex_FoldedSections,
+			\ '^\s*\\frontmatter\|^\s*\\mainmatter\|^\s*\\backmatter\|'
+			\. '^\s*\\begin{thebibliography\|>>>\|^\s*\\endinput\|'
+			\. '^\s*\\begin{slide\|^\s*\\end{document')
+	endif
+	" }}} 
+	
+	" {{{ slide
+	if g:Tex_FoldedMisc =~ '\<slide\>'
+		call AddSyntaxFoldItem (
+			\ '^\s*\\begin{slide',
+			\ '^\s*\\appendix\W\|^\s*\\chapter\W\|^\s*\\end{slide\|^\s*\\end{document',
+			\ 0,
+			\ 0
+			\ )
+	endif
+	" }}}
+
+	" {{{ preamble
+	if g:Tex_FoldedMisc =~ '\<preamble\>'
+		call AddSyntaxFoldItem (
+			\ '^\s*\\document\(class\|style\).*{',
+			\ '^\s*\\begin{document}',
+			\ 0,
+			\ -1 
+			\ )
+	endif
+	" }}}
+
+	" Manually folded regions {{{
+	if g:Tex_FoldedMisc =~ '\(^\|,\)<<<\(,\|$\)'
+		call AddSyntaxFoldItem (
+			\ '<<<',
+			\ '>>>',
+			\ 0,
+			\ 0
+			\ )
+	endif
+	" }}}
+	
+	call MakeSyntaxFolds(a:force)
+	normal! zv
+endfunction
+
+" }}}
+" TexFoldTextFunction: create fold text for folds {{{
+function! TexFoldTextFunction()
+	let leadingSpace = matchstr('                                       ', ' \{,'.indent(v:foldstart).'}')
+	if getline(v:foldstart) =~ '^\s*\\begin{'
+		let header = matchstr(getline(v:foldstart),
+							\ '^\s*\\begin{\zs\([:alpha:]*\)[^}]*\ze}')
+		let caption = ''
+		let label = ''
+		let i = v:foldstart
+		while i <= v:foldend
+			if getline(i) =~ '\\caption'
+				" distinguish between
+				" \caption{fulldesc} - fulldesc will be displayed
+				" \caption[shortdesc]{fulldesc} - shortdesc will be displayed
+				if getline(i) =~ '\\caption\['
+					let caption = matchstr(getline(i), '\\caption\[\zs[^\]]*')
+					let caption = substitute(caption, '\zs\]{.*}[^}]*$', '', '')
+				else
+					let caption = matchstr(getline(i), '\\caption{\zs.*')
+					let caption = substitute(caption, '\zs}[^}]*$', '', '')
+				end
+			elseif getline(i) =~ '\\label'
+				let label = matchstr(getline(i), '\\label{\zs.*')
+				let label = substitute(label, '\zs}[^}]*$', '', '')
+			end
+
+			let i = i + 1
+		endwhile
+
+		let ftxto = foldtext()
+		" if no caption found, then use the second line.
+		if caption == ''
+			let caption = getline(v:foldstart + 1)
+		end
+
+		let retText = matchstr(ftxto, '^[^:]*').': '.header.
+						\ ' ('.label.') : '.caption
+		return leadingSpace.retText
+
+	elseif getline(v:foldstart) =~ '^%' && getline(v:foldstart) !~ '^%%fake'
+		let ftxto = foldtext()
+		return leadingSpace.substitute(ftxto, ':', ': % ', '')
+	elseif getline(v:foldstart) =~ '^\s*\\document\(class\|style\).*{'
+		let ftxto = leadingSpace.foldtext()
+		return substitute(ftxto, ':', ': Preamble: ', '')
+	else
+		return leadingSpace.foldtext()
+	end
+endfunction
+" }}}
+
+" vim:fdm=marker:ff=unix:noet:ts=4:sw=4