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| -rw-r--r-- | runtime/syntax/lhaskell.vim | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/runtime/syntax/lhaskell.vim b/runtime/syntax/lhaskell.vim new file mode 100644 index 0000000..0a8a076 --- /dev/null +++ b/runtime/syntax/lhaskell.vim @@ -0,0 +1,123 @@ +" 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 +" + + +" quit when a syntax file was already loaded +if 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" + runtime! syntax/tex.vim + unlet b:current_syntax + " Tex.vim removes "_" from 'iskeyword', but we need it for Haskell. + setlocal isk+=_ + 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 +syntax include @haskellTop syntax/haskell.vim + +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. +" Only when an item doesn't have highlighting yet + +hi def link lhsBirdTrack Comment + +hi def link beginCodeBegin texCmdName +hi def link beginCodeCode texSection + + +" 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 |