gffranco
9de8543385
A literal `<span style="color:…">` in prose (the sample wiki's own colorize instructions used one, with a `…` ellipsis as the colour) was matched by the scanner and fed to `highlight guifg=…`, which raised E254 on the un-silenced guifg line. That aborted the whole nuwiki#colors#refresh(), so on the Vim clients NO spans got concealed (start-vim) and follow-link crashed mid FileType autocmd (start-vim-coc). Neovim happened to dodge it depending on which buffer was scanned. s:define() now: - validates the colour (only #hex or an alphabetic name) and skips anything else — rgb()/hsl() functions and prose examples no longer create bogus conceal regions or errors; - runs both `highlight` calls under `silent!`, so a valid-format but unknown name can't abort the refresh either (tags still conceal, text just isn't recoloured). Also reworded the sample wiki's colorize note so it no longer embeds a literal span tag. Test: colorize.skips_unallocatable_colour (vim) — an rgb() span before a real one: refresh doesn't error, the rgb span isn't concealed, the real span still is. nvim 269, vim 260+18, all green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
70 lines
2.9 KiB
VimL
70 lines
2.9 KiB
VimL
" autoload/nuwiki/colors.vim — conceal colour spans down to their text.
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"
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" `:VimwikiColorize NAME` wraps text in `<span style="color:NAME">TEXT</span>`.
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" This hides the two tags (conceal) and paints TEXT in NAME, so the buffer
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" shows just the coloured word — matching how the HTML export renders it.
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"
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" Pure syntax + `:highlight`, no LSP needed, so it works the same in Vim,
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" coc.nvim, and Neovim. New colours appear as the user runs :VimwikiColorize,
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" so the ftplugin re-runs refresh() on text changes; we track which colours
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" already have a syntax group in b:nuwiki_color_seen to stay idempotent.
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" Scan the buffer for `<span style="color:…">` and define a concealing,
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" colouring syntax region for each colour not yet seen.
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function! nuwiki#colors#refresh() abort
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if !exists('b:nuwiki_color_seen')
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let b:nuwiki_color_seen = {}
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endif
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let l:n = line('$')
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let l:lnum = 1
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while l:lnum <= l:n
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let l:line = getline(l:lnum)
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if stridx(l:line, '<span style="color:') >= 0
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let l:pos = 0
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while 1
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let l:mp = matchstrpos(l:line, '<span style="color:[^"]\{-}">', l:pos)
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if l:mp[1] < 0
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break
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endif
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let l:pos = l:mp[2]
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call s:define(matchstr(l:mp[0], 'color:\zs[^"]\{-}\ze">'))
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endwhile
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endif
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let l:lnum += 1
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endwhile
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endfunction
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" Define (once per colour) a region that conceals `<span …>` / `</span>` and
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" paints the wrapped text in that colour.
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function! s:define(color) abort
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if a:color ==# '' || has_key(b:nuwiki_color_seen, a:color)
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return
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endif
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let b:nuwiki_color_seen[a:color] = 1
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" Only handle colours Vim can actually allocate: a #hex value or an
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" alphabetic name. Anything else — rgb()/hsl() functions, or a literal
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" `<span style="color:…">` that turns up in prose/examples — is skipped, so
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" a stray match can't create a bogus conceal region or abort the refresh.
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if a:color !~# '^#\x\{3,8}$' && a:color !~# '^[A-Za-z][A-Za-z0-9]*$'
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return
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endif
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let l:grp = 'nuwikiColorSpan_' . substitute(a:color, '[^A-Za-z0-9]', '_', 'g')
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let l:esc = escape(a:color, '/\.*$^~[]')
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" Clear first so re-runs / load-order never stack duplicate regions.
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silent! execute 'syntax clear ' . l:grp
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" `concealends` hides the start/end matches (the tags); the region body
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" (the text) keeps the l:grp highlight. `oneline` since spans don't wrap.
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execute 'syntax region ' . l:grp
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\ . ' matchgroup=Conceal'
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\ . ' start=/<span style="color:' . l:esc . '">/'
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\ . ' end=#</span>#'
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\ . ' oneline keepend concealends'
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" guifg works for names and #hex under 'termguicolors'; ctermfg only for
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" named colours. Both are best-effort — `silent!` swallows E254 for a name
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" Vim doesn't know (the tags still conceal, the text just isn't recoloured).
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silent! execute 'highlight default ' . l:grp . ' guifg=' . a:color
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if a:color !~# '^#'
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silent! execute 'highlight ' . l:grp . ' ctermfg=' . a:color
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endif
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endfunction
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