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135 lines
4.8 KiB
VimL
135 lines
4.8 KiB
VimL
" Vim syntax file
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" Language: Haskell with literate comments, Bird style,
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" Markdown style, TeX style and plain text surrounding
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" \begin{code} \end{code} blocks
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" Maintainer: Haskell Cafe mailinglist <haskell-cafe@haskell.org>
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" Original Author: Arthur van Leeuwen <arthurvl@cs.uu.nl>
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" Last Change: 2020 Feb 25
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" Version: 1.05
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"
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" Thanks to Ian Lynagh for thoughtful comments on initial versions and
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" for the inspiration for writing this in the first place.
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"
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" This style guesses as to the type of markup used in a literate haskell
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" file and will highlight (La)TeX markup if it finds any
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" This behaviour can be overridden, both glabally and locally using
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" the lhs_markup variable or b:lhs_markup variable respectively.
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"
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" lhs_markup must be set to either tex or none to indicate that
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" you always want (La)TeX highlighting or no highlighting
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" must not be set to let the highlighting be guessed
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" b:lhs_markup must be set to eiterh tex or none to indicate that
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" you want (La)TeX highlighting or no highlighting for
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" this particular buffer
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" must not be set to let the highlighting be guessed
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"
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"
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" 2004 February 18: New version, based on Ian Lynagh's TeX guessing
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" lhaskell.vim, cweb.vim, tex.vim, sh.vim and fortran.vim
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" 2004 February 20: Cleaned up the guessing and overriding a bit
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" 2004 February 23: Cleaned up syntax highlighting for \begin{code} and
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" \end{code}, added some clarification to the attributions
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" 2008 July 1: Removed % from guess list, as it totally breaks plain
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" text markup guessing
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" 2009 April 29: Fixed highlighting breakage in TeX mode,
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" thanks to Kalman Noel
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"
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" quit when a syntax file was already loaded
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if exists("b:current_syntax")
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finish
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endif
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" First off, see if we can inherit a user preference for lhs_markup
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if !exists("b:lhs_markup")
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if exists("lhs_markup")
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if lhs_markup =~ '\<\%(tex\|md\|none\)\>'
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let b:lhs_markup = matchstr(lhs_markup,'\<\%(tex\|md\|none\)\>')
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else
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echohl WarningMsg | echo "Unknown value of lhs_markup" | echohl None
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let b:lhs_markup = "unknown"
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endif
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else
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let b:lhs_markup = "unknown"
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endif
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else
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if b:lhs_markup !~ '\<\%(tex\|md\|none\)\>'
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let b:lhs_markup = "unknown"
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endif
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endif
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" Remember where the cursor is, and go to upperleft
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let s:oldline=line(".")
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let s:oldcolumn=col(".")
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call cursor(1,1)
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" If no user preference, scan buffer for our guess of the markup to
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" highlight. We only differentiate between TeX and plain markup, where
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" plain is not highlighted. The heuristic for finding TeX markup is if
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" one of the following occurs anywhere in the file:
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" - \documentclass
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" - \begin{env} (for env != code)
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" - \part, \chapter, \section, \subsection, \subsubsection, etc
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if b:lhs_markup == "unknown"
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if search('\\documentclass\|\\begin{\(code}\)\@!\|\\\(sub\)*section\|\\chapter|\\part','W') != 0
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let b:lhs_markup = "tex"
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elseif search('```haskell','W') != 0
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let b:lhs_markup = "md"
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else
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let b:lhs_markup = "plain"
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endif
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endif
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" If user wants us to highlight TeX syntax or guess thinks it's TeX, read it.
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if b:lhs_markup == "tex"
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runtime! syntax/tex.vim
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unlet b:current_syntax
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" Tex.vim removes "_" from 'iskeyword', but we need it for Haskell.
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setlocal isk+=_
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syntax cluster lhsTeXContainer contains=tex.*Zone,texAbstract
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elseif b:lhs_markup == "md"
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runtime! syntax/markdown.vim
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unlet b:current_syntax
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syntax cluster lhsTeXContainer contains=markdown.*
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else
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syntax cluster lhsTeXContainer contains=.*
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endif
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" Literate Haskell is Haskell in between text, so at least read Haskell
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" highlighting
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syntax include @haskellTop syntax/haskell.vim
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syntax region lhsHaskellBirdTrack start="^>" end="\%(^[^>]\)\@=" contains=@haskellTop,lhsBirdTrack containedin=@lhsTeXContainer
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syntax region lhsHaskellBeginEndBlock start="^\\begin{code}\s*$" matchgroup=NONE end="\%(^\\end{code}.*$\)\@=" contains=@haskellTop,beginCodeBegin containedin=@lhsTeXContainer
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syntax region lhsHaskellMDBlock start="^```haskell$" matchgroup=NONE end="^```$" keepend contains=@haskellTop,lhsMarkdownCode containedin=@lhsTeXContainer
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syntax match lhsBirdTrack "^>" contained
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syntax match lhsMarkdownCode "^\(```haskell\|^```\)$" contained
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syntax match beginCodeBegin "^\\begin" nextgroup=beginCodeCode contained
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syntax region beginCodeCode matchgroup=texDelimiter start="{" end="}"
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" Define the default highlighting.
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" Only when an item doesn't have highlighting yet
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hi def link lhsBirdTrack Comment
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hi def link lhsMarkdownCode Comment
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hi def link beginCodeBegin texCmdName
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hi def link beginCodeCode texSection
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" Restore cursor to original position, as it may have been disturbed
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" by the searches in our guessing code
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call cursor (s:oldline, s:oldcolumn)
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unlet s:oldline
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unlet s:oldcolumn
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let b:current_syntax = "lhaskell"
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" vim: ts=8
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