feat(checkhealth): use "help" syntax, avoid tabpage #20879

- If Nvim was just started, don't create a new tab.
- Name the buffer "health://".
- Use "help" syntax instead of "markdown". It fits better, and
  eliminates various workarounds.
- Simplfy formatting, avoid visual noise.
- Don't print a "INFO" status, it is noisy.
- Drop the ":" after statuses, they are already UPPERCASE and highlighted.

1 files changed, 8 insertions, 13 deletions

diff --git a/runtime/syntax/checkhealth.vim b/runtime/syntax/checkhealth.vim
index 37f1822740..4b0ce75a54 100644
--- a/runtime/syntax/checkhealth.vim
+++ b/runtime/syntax/checkhealth.vim
@@ -1,26 +1,21 @@
 " Vim syntax file
-" Language:     Neovim checkhealth buffer
-" Last Change:  2021 Dec 15
+" Language:     Nvim :checkhealth buffer
+" Last Change:  2022 Nov 10
 
 if exists("b:current_syntax")
   finish
 endif
 
-runtime! syntax/markdown.vim
+runtime! syntax/help.vim
 unlet! b:current_syntax
 
 syn case match
 
-" We do not care about markdown syntax errors
-if hlexists('markdownError')
-  syn clear markdownError
-endif
-
-syn keyword healthError ERROR[:] containedin=markdownCodeBlock,mkdListItemLine
-syn keyword healthWarning WARNING[:] containedin=markdownCodeBlock,mkdListItemLine
-syn keyword healthSuccess OK[:] containedin=markdownCodeBlock,mkdListItemLine
-syn match healthHelp "|.\{-}|" containedin=markdownCodeBlock,mkdListItemLine contains=healthBar
-syn match healthBar  "|" contained conceal
+syn keyword healthError ERROR[:]
+syn keyword healthWarning WARNING[:]
+syn keyword healthSuccess OK[:]
+syn match helpSectionDelim "^======*\n.*$"
+syn match healthHeadingChar "=" conceal cchar=─ contained containedin=helpSectionDelim
 
 hi def link healthError Error
 hi def link healthWarning WarningMsg