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-" Language: Markdown with chunks of R, Python and other languages
-" Maintainer: This runtime file is looking for a new maintainer.
-" Former Maintainer: Jakson Alves de Aquino <jalvesaq@gmail.com>
-" Former Repository: https://github.com/jalvesaq/R-Vim-runtime
-" Last Change: 2023 Dec 24 07:21AM
-" 2024 Feb 19 by Vim Project (announce adoption)
-"
-" For highlighting pandoc extensions to markdown like citations and TeX and
-" many other advanced features like folding of markdown sections, it is
-" recommended to install the vim-pandoc filetype plugin as well as the
-" vim-pandoc-syntax filetype plugin from https://github.com/vim-pandoc.
-
-
-if exists("b:current_syntax")
- finish
-endif
-
-let s:cpo_save = &cpo
-set cpo&vim
-
-let g:rmd_include_latex = get(g:, 'rmd_include_latex', 1)
-if g:rmd_include_latex == 0 || g:rmd_include_latex == 1
- let b:rmd_has_LaTeX = v:false
-elseif g:rmd_include_latex == 2
- let b:rmd_has_LaTeX = v:true
-endif
-
-" Highlight the header of the chunks as R code
-let g:rmd_syn_hl_chunk = get(g:, 'rmd_syn_hl_chunk', 0)
-
-" Pandoc-syntax has more features, but it is slower.
-" https://github.com/vim-pandoc/vim-pandoc-syntax
-
-" Don't waste time loading syntax that will be discarded:
-let s:save_pandoc_lngs = get(g:, 'pandoc#syntax#codeblocks#embeds#langs', [])
-let g:pandoc#syntax#codeblocks#embeds#langs = []
-
-let g:rmd_dynamic_fenced_languages = get(g:, 'rmd_dynamic_fenced_languages', v:true)
-
-" Step_1: Source pandoc.vim if it is installed:
-runtime syntax/pandoc.vim
-if exists("b:current_syntax")
- if hlexists('pandocDelimitedCodeBlock')
- syn clear pandocDelimitedCodeBlock
- endif
-
- if len(s:save_pandoc_lngs) > 0 && !exists('g:rmd_fenced_languages')
- let g:rmd_fenced_languages = deepcopy(s:save_pandoc_lngs)
- endif
-
- " Recognize inline R code
- syn region rmdrInline matchgroup=rmdInlineDelim start="`r " end="`" contains=@Rmdr containedin=pandocLaTeXRegion,yamlFlowString keepend
-else
- " Step_2: Source markdown.vim if pandoc.vim is not installed
-
- " Configuration if not using pandoc syntax:
- " Add syntax highlighting of YAML header
- let g:rmd_syn_hl_yaml = get(g:, 'rmd_syn_hl_yaml', 1)
- " Add syntax highlighting of citation keys
- let g:rmd_syn_hl_citations = get(g:, 'rmd_syn_hl_citations', 1)
-
- " R chunks will not be highlighted by syntax/markdown because their headers
- " follow a non standard pattern: "```{lang" instead of "^```lang".
- " Make a copy of g:markdown_fenced_languages to highlight the chunks later:
- if exists('g:markdown_fenced_languages') && !exists('g:rmd_fenced_languages')
- let g:rmd_fenced_languages = deepcopy(g:markdown_fenced_languages)
- endif
-
- if exists('g:markdown_fenced_languages') && len(g:markdown_fenced_languages) > 0
- let s:save_mfl = deepcopy(g:markdown_fenced_languages)
- endif
- " Don't waste time loading syntax that will be discarded:
- let g:markdown_fenced_languages = []
- runtime syntax/markdown.vim
- if exists('s:save_mfl') > 0
- let g:markdown_fenced_languages = deepcopy(s:save_mfl)
- unlet s:save_mfl
- endif
- syn region rmdrInline matchgroup=rmdInlineDelim start="`r " end="`" contains=@Rmdr keepend
-
- " Step_2a: Add highlighting for both YAML and citations which are pandoc
- " specific, but also used in Rmd files
-
- " You don't need this if either your markdown/syntax.vim already highlights
- " the YAML header or you are writing standard markdown
- if g:rmd_syn_hl_yaml
- " Basic highlighting of YAML header
- syn match rmdYamlFieldTtl /^\s*\zs\w\%(-\|\w\)*\ze:/ contained
- syn match rmdYamlFieldTtl /^\s*-\s*\zs\w\%(-\|\w\)*\ze:/ contained
- syn region yamlFlowString matchgroup=yamlFlowStringDelimiter start='"' skip='\\"' end='"' contains=yamlEscape,rmdrInline contained
- syn region yamlFlowString matchgroup=yamlFlowStringDelimiter start="'" skip="''" end="'" contains=yamlSingleEscape,rmdrInline contained
- syn match yamlEscape contained '\\\%([\\"abefnrtv\^0_ NLP\n]\|x\x\x\|u\x\{4}\|U\x\{8}\)'
- syn match yamlSingleEscape contained "''"
- syn match yamlComment /#.*/ contained
- " A second colon is a syntax error, unless within a string or following !expr
- syn match yamlColonError /:\s*[^'^"^!]*:/ contained
- if &filetype == 'quarto'
- syn region pandocYAMLHeader matchgroup=rmdYamlBlockDelim start=/\%(\%^\|\_^\s*\n\)\@<=\_^-\{3}\ze\n.\+/ end=/^---$/ keepend contains=rmdYamlFieldTtl,yamlFlowString,yamlComment,yamlColonError
- else
- syn region pandocYAMLHeader matchgroup=rmdYamlBlockDelim start=/\%(\%^\|\_^\s*\n\)\@<=\_^-\{3}\ze\n.\+/ end=/^\([-.]\)\1\{2}$/ keepend contains=rmdYamlFieldTtl,yamlFlowString,yamlComment,yamlColonError
- endif
- hi def link rmdYamlBlockDelim Delimiter
- hi def link rmdYamlFieldTtl Identifier
- hi def link yamlFlowString String
- hi def link yamlComment Comment
- hi def link yamlColonError Error
- endif
-
- " Conceal char for manual line break
- if &encoding ==# 'utf-8'
- syn match rmdNewLine ' $' conceal cchar=↵
- endif
-
- " You don't need this if either your markdown/syntax.vim already highlights
- " citations or you are writing standard markdown
- if g:rmd_syn_hl_citations
- " From vim-pandoc-syntax
- " parenthetical citations
- syn match pandocPCite /\^\@<!\[[^\[\]]\{-}-\{0,1}@[[:alnum:]_][[:alnum:]à-öø-ÿÀ-ÖØ-ß_:.#$%&\-+?<>~\/]*.\{-}\]/ contains=pandocEmphasis,pandocStrong,pandocLatex,pandocCiteKey,@Spell,pandocAmpersandEscape display
- " in-text citations with location
- syn match pandocICite /@[[:alnum:]_][[:alnum:]à-öø-ÿÀ-ÖØ-ß_:.#$%&\-+?<>~\/]*\s\[.\{-1,}\]/ contains=pandocCiteKey,@Spell display
- " cite keys
- syn match pandocCiteKey /\(-\=@[[:alnum:]_][[:alnum:]à-öø-ÿÀ-ÖØ-ß_:.#$%&\-+?<>~\/]*\)/ containedin=pandocPCite,pandocICite contains=@NoSpell display
- syn match pandocCiteAnchor /[-@]/ contained containedin=pandocCiteKey display
- syn match pandocCiteLocator /[\[\]]/ contained containedin=pandocPCite,pandocICite
- hi def link pandocPCite Operator
- hi def link pandocICite Operator
- hi def link pandocCiteKey Label
- hi def link pandocCiteAnchor Operator
- hi def link pandocCiteLocator Operator
- endif
-endif
-
-" Step_3: Highlight code blocks.
-
-syn region rmdCodeBlock matchgroup=rmdCodeDelim start="^\s*```\s*{.*}$" matchgroup=rmdCodeDelim end="^\s*```\ze\s*$" keepend
-syn region rmdCodeBlock matchgroup=rmdCodeDelim start="^\s*```.+$" matchgroup=rmdCodeDelim end="^```$" keepend
-hi link rmdCodeBlock Special
-
-" Now highlight chunks:
-syn region knitrBodyOptions start='^#| ' end='$' contained containedin=rComment,pythonComment contains=knitrBodyVar,knitrBodyValue transparent
-syn match knitrBodyValue ': \zs.*\ze$' keepend contained containedin=knitrBodyOptions
-syn match knitrBodyVar '| \zs\S\{-}\ze:' contained containedin=knitrBodyOptions
-
-let g:rmd_fenced_languages = get(g:, 'rmd_fenced_languages', ['r'])
-
-let s:no_syntax_vim = []
-function s:IncludeLanguage(lng)
- if a:lng =~ '='
- let ftpy = substitute(a:lng, '.*=', '', '')
- let lnm = substitute(a:lng, '=.*', '', '')
- else
- let ftpy = a:lng
- let lnm = a:lng
- endif
- if index(s:no_syntax_vim, ftpy) >= 0
- return
- endif
- if len(globpath(&rtp, "syntax/" . ftpy . ".vim"))
- unlet! b:current_syntax
- exe 'syn include @Rmd'.lnm.' syntax/'.ftpy.'.vim'
- let b:current_syntax = "rmd"
- if g:rmd_syn_hl_chunk
- exe 'syn match knitrChunkDelim /```\s*{\s*'.lnm.'/ contained containedin=knitrChunkBrace contains=knitrChunkLabel'
- exe 'syn match knitrChunkLabelDelim /```\s*{\s*'.lnm.',\=\s*[-[:alnum:]]\{-1,}[,}]/ contained containedin=knitrChunkBrace'
- syn match knitrChunkDelim /}\s*$/ contained containedin=knitrChunkBrace
- exe 'syn match knitrChunkBrace /```\s*{\s*'.lnm.'.*$/ contained containedin=rmd'.lnm.'Chunk contains=knitrChunkDelim,knitrChunkLabelDelim,@Rmd'.lnm
- exe 'syn region rmd'.lnm.'Chunk start="^\s*```\s*{\s*=\?'.lnm.'\>.*$" matchgroup=rmdCodeDelim end="^\s*```\ze\s*$" keepend contains=knitrChunkBrace,@Rmd'.lnm
-
- hi link knitrChunkLabel Identifier
- hi link knitrChunkDelim rmdCodeDelim
- hi link knitrChunkLabelDelim rmdCodeDelim
- else
- exe 'syn region rmd'.lnm.'Chunk matchgroup=rmdCodeDelim start="^\s*```\s*{\s*=\?'.lnm.'\>.*$" matchgroup=rmdCodeDelim end="^\s*```\ze\s*$" keepend contains=@Rmd'.lnm
- endif
- else
- " Avoid the cost of running globpath() whenever the buffer is saved
- let s:no_syntax_vim += [ftpy]
- endif
-endfunction
-
-for s:type in g:rmd_fenced_languages
- call s:IncludeLanguage(s:type)
-endfor
-unlet! s:type
-
-let s:LaTeX_included = v:false
-function s:IncludeLaTeX()
- let s:LaTeX_included = v:true
- unlet! b:current_syntax
- syn include @RmdLaTeX syntax/tex.vim
- " From vim-pandoc-syntax
- syn region rmdLaTeXInlineMath start=/\v\\@<!\$\S@=/ end=/\v\\@<!\$\d@!/ keepend contains=@RmdLaTeX
- syn match rmdLaTeXCmd /\\[[:alpha:]]\+\(\({.\{-}}\)\=\(\[.\{-}\]\)\=\)*/ contains=@RmdLaTeX
- syn region rmdLaTeX start='\$\$' end='\$\$' keepend contains=@RmdLaTeX
- syn region rmdLaTeX start=/\\begin{\z(.\{-}\)}/ end=/\\end{\z1}/ keepend contains=@RmdLaTeX
-endfunction
-
-function s:CheckRmdFencedLanguages()
- let alines = getline(1, '$')
- call filter(alines, "v:val =~ '^```{'")
- call map(alines, "substitute(v:val, '^```{', '', '')")
- call map(alines, "substitute(v:val, '\\W.*', '', '')")
- for tpy in alines
- if len(tpy) == 0
- continue
- endif
- let has_lng = 0
- for lng in g:rmd_fenced_languages
- if tpy == lng
- let has_lng = 1
- continue
- endif
- endfor
- if has_lng == 0
- let g:rmd_fenced_languages += [tpy]
- call s:IncludeLanguage(tpy)
- endif
- endfor
-
- if hlexists('pandocLaTeXCommand')
- return
- endif
- if g:rmd_include_latex
- if !b:rmd_has_LaTeX && (search('\$\$', 'wn') > 0 ||
- \ search('\\begin{', 'wn') > 0) ||
- \ search('\\[[:alpha:]]\+', 'wn') ||
- \ search('\$[^\$]\+\$', 'wn')
- let b:rmd_has_LaTeX = v:true
- endif
- if b:rmd_has_LaTeX && !s:LaTeX_included
- call s:IncludeLaTeX()
- endif
- endif
-endfunction
-
-if g:rmd_dynamic_fenced_languages
- call s:CheckRmdFencedLanguages()
- augroup RmdSyntax
- autocmd!
- autocmd BufWritePost <buffer> call s:CheckRmdFencedLanguages()
- augroup END
-endif
-
-" Step_4: Highlight code recognized by pandoc but not defined in pandoc.vim yet:
-syn match pandocDivBegin '^:::\+ {.\{-}}' contains=pandocHeaderAttr
-syn match pandocDivEnd '^:::\+$'
-
-hi def link knitrBodyVar PreProc
-hi def link knitrBodyValue Constant
-hi def link knitrBodyOptions rComment
-hi def link pandocDivBegin Delimiter
-hi def link pandocDivEnd Delimiter
-hi def link rmdInlineDelim Delimiter
-hi def link rmdCodeDelim Delimiter
-
-if len(s:save_pandoc_lngs)
- let g:pandoc#syntax#codeblocks#embeds#langs = s:save_pandoc_lngs
-endif
-unlet s:save_pandoc_lngs
-let &cpo = s:cpo_save
-unlet s:cpo_save
-
-syntax iskeyword clear
-
-let b:current_syntax = "rmd"
-
-" vim: ts=8 sw=2