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" Vim syntax file
" Language: Haskell with literate comments, Bird style,
" TeX style and plain text surrounding
" \begin{code} \end{code} blocks
" Maintainer: Haskell Cafe mailinglist <haskell-cafe@haskell.org>
" Original Author: Arthur van Leeuwen <arthurvl@cs.uu.nl>
" Last Change: 2010 Apr 11
" Version: 1.04
"
" Thanks to Ian Lynagh for thoughtful comments on initial versions and
" for the inspiration for writing this in the first place.
"
" This style guesses as to the type of markup used in a literate haskell
" file and will highlight (La)TeX markup if it finds any
" This behaviour can be overridden, both glabally and locally using
" the lhs_markup variable or b:lhs_markup variable respectively.
"
" lhs_markup must be set to either tex or none to indicate that
" you always want (La)TeX highlighting or no highlighting
" must not be set to let the highlighting be guessed
" b:lhs_markup must be set to eiterh tex or none to indicate that
" you want (La)TeX highlighting or no highlighting for
" this particular buffer
" must not be set to let the highlighting be guessed
"
"
" 2004 February 18: New version, based on Ian Lynagh's TeX guessing
" lhaskell.vim, cweb.vim, tex.vim, sh.vim and fortran.vim
" 2004 February 20: Cleaned up the guessing and overriding a bit
" 2004 February 23: Cleaned up syntax highlighting for \begin{code} and
" \end{code}, added some clarification to the attributions
" 2008 July 1: Removed % from guess list, as it totally breaks plain
" text markup guessing
" 2009 April 29: Fixed highlighting breakage in TeX mode,
" thanks to Kalman Noel
"
" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
syntax clear
elseif exists("b:current_syntax")
finish
endif
" First off, see if we can inherit a user preference for lhs_markup
if !exists("b:lhs_markup")
if exists("lhs_markup")
if lhs_markup =~ '\<\%(tex\|none\)\>'
let b:lhs_markup = matchstr(lhs_markup,'\<\%(tex\|none\)\>')
else
echohl WarningMsg | echo "Unknown value of lhs_markup" | echohl None
let b:lhs_markup = "unknown"
endif
else
let b:lhs_markup = "unknown"
endif
else
if b:lhs_markup !~ '\<\%(tex\|none\)\>'
let b:lhs_markup = "unknown"
endif
endif
" Remember where the cursor is, and go to upperleft
let s:oldline=line(".")
let s:oldcolumn=col(".")
call cursor(1,1)
" If no user preference, scan buffer for our guess of the markup to
" highlight. We only differentiate between TeX and plain markup, where
" plain is not highlighted. The heuristic for finding TeX markup is if
" one of the following occurs anywhere in the file:
" - \documentclass
" - \begin{env} (for env != code)
" - \part, \chapter, \section, \subsection, \subsubsection, etc
if b:lhs_markup == "unknown"
if search('\\documentclass\|\\begin{\(code}\)\@!\|\\\(sub\)*section\|\\chapter|\\part','W') != 0
let b:lhs_markup = "tex"
else
let b:lhs_markup = "plain"
endif
endif
" If user wants us to highlight TeX syntax or guess thinks it's TeX, read it.
if b:lhs_markup == "tex"
if version < 600
source <sfile>:p:h/tex.vim
set isk+=_
else
runtime! syntax/tex.vim
unlet b:current_syntax
" Tex.vim removes "_" from 'iskeyword', but we need it for Haskell.
setlocal isk+=_
endif
syntax cluster lhsTeXContainer contains=tex.*Zone,texAbstract
else
syntax cluster lhsTeXContainer contains=.*
endif
" Literate Haskell is Haskell in between text, so at least read Haskell
" highlighting
if version < 600
syntax include @haskellTop <sfile>:p:h/haskell.vim
else
syntax include @haskellTop syntax/haskell.vim
endif
syntax region lhsHaskellBirdTrack start="^>" end="\%(^[^>]\)\@=" contains=@haskellTop,lhsBirdTrack containedin=@lhsTeXContainer
syntax region lhsHaskellBeginEndBlock start="^\\begin{code}\s*$" matchgroup=NONE end="\%(^\\end{code}.*$\)\@=" contains=@haskellTop,beginCodeBegin containedin=@lhsTeXContainer
syntax match lhsBirdTrack "^>" contained
syntax match beginCodeBegin "^\\begin" nextgroup=beginCodeCode contained
syntax region beginCodeCode matchgroup=texDelimiter start="{" end="}"
" Define the default highlighting.
" For version 5.7 and earlier: only when not done already
" For version 5.8 and later: only when an item doesn't have highlighting yet
if version >= 508 || !exists("did_tex_syntax_inits")
if version < 508
let did_tex_syntax_inits = 1
command -nargs=+ HiLink hi link <args>
else
command -nargs=+ HiLink hi def link <args>
endif
HiLink lhsBirdTrack Comment
HiLink beginCodeBegin texCmdName
HiLink beginCodeCode texSection
delcommand HiLink
endif
" Restore cursor to original position, as it may have been disturbed
" by the searches in our guessing code
call cursor (s:oldline, s:oldcolumn)
unlet s:oldline
unlet s:oldcolumn
let b:current_syntax = "lhaskell"
" vim: ts=8