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