" Clear all existing syntax
syntax clear

syntax include @Markdown syntax/markdown.vim

" ---------------------------------------------
"  タイトル部分
"  例: #1234 [open] Title of the Issue
syntax region githubIssueTitle start=/\m\(^\)\@<=TITLE:>=\+$/ end=/\m^\(META:>=\+$\)\@=/
      \ keepend
      \ contains=githubIssueTitleMarkerStart,githubIssueNumber,githubIssueStateOpen,githubIssueStateClosed
      \ nextgroup=githubIssueMeta
syntax match githubIssueTitleMarkerStart /^TITLE:>=\+/
      \ contained
syntax match githubIssueNumber /^#\d\+/ 
      \ contained
      \ nextgroup=githubIssueStateOpen,githubIssueStateClosed
syntax match githubIssueStateOpen /\[open\]/
      \ contained
syntax match githubIssueStateClosed /\[closed\]/
      \ contained

" ---------------------------------------------
"  メタ情報
syntax region githubIssueMeta start=/\m\(^\)\@<=META:>=\+$/ end=/\m^\(BODY:>=\+$\)\@=/
      \ contains=githubIssueMetaMarkerStart,githubIssueMetaKey,githubIssueMetaDelimiter,githubIssueMetaValue
      \ keepend
      \ nextgroup=githubIssueBody
syntax match githubIssueMetaMarkerStart /^META:>=\+$/
      \ contained
" RepositoryなどのKey:Value行
syntax match githubIssueMetaKey /\m^\[[^\]]*\]/
      \ contained
      \ nextgroup=githubIssueMetaDelimiter
syntax match githubIssueMetaDelimiter /\m\s:\s/
      \ contained
      \ nextgroup=githubIssueMetaValue
syntax match githubIssueMetaValue /\( : \)\@<=.*$/
      \ containedin=githubIssueMeta

" ---------------------------------------------
"  ボディ
syntax region githubIssueBody start=/\m\(^\)\@<=BODY:>=\+$/ end=/\m^\(COMMENTS (\d\+):>=\+$\)\@=/
    \ contains=githubIssueBodyMarkerStart,@Markdown
    \ keepend
syntax match githubIssueBodyMarkerStart /^BODY:>=\+/ contained

" ---------------------------------------------
"  コメント
syntax match githubIssueCommentMarkerStart /^COMMENTS (\d\+):>=\+$/ 
      \ contains=githubIssueCommentCount
syntax match githubIssueCommentCount /\(^COMMENTS (\)\@<=\d\+\():>=\+$\)\@=/

" コメントブロック識別
syntax region githubIssueComment start=/\m\(^\)\@<=-- C-#\d\+ / end=/\m\(^\)\@<=:/
      \ contains=githubIssueCommentMeta,@Markdown
      \ keepend
" コメントブロック識別（Folded）
syntax region githubIssueCommentMinimized start=/\m\(^\)\@<=-- M-#\d\+ / end=/\m\(^\)\@<=:/
      \ contains=githubIssueCommentMeta,@Markdown
      \ fold
      \ keepend

syntax match githubIssueCommentMeta /^-- [CM]-#\d\+ @[^ ]\+ \d\{4,\}-\d\d-\d\d \d\d:\d\d\( \[[a-zA-Z]\+\(, [a-zA-Z]\+\)*\]\)\? -\+$/
      \ contained
      \ contains=githubIssueCommentMetaNumber,githubIssueCommentMetaAuthor,githubIssueCommentFlag

syntax match githubIssueCommentMetaNumber  /#\d\+/ contained
syntax match githubIssueCommentMetaAuthor  /@[^ ]\+/ contained

syntax region githubIssueCommentFlag start="\[" end="\]"
      \ contained
      \ contains=githubIssueCommentFlagEdited,githubIssueCommentFlagAuthor,githubIssueCommentFlagOwner,githubIssueCommentFlagAbuse,githubIssueCommentFlagOffTopic,githubIssueCommentFlagOutdated,githubIssueCommentFlagResolved,githubIssueCommentFlagDuplicate,githubIssueCommentFlagSpam

syntax keyword githubIssueCommentFlagEdited    Edited    contained
syntax keyword githubIssueCommentFlagAuthor    Author    contained
syntax keyword githubIssueCommentFlagOwner     Owner     contained
syntax keyword githubIssueCommentFlagAbuse     ABUSE     contained
syntax keyword githubIssueCommentFlagOffTopic  OFF_TOPIC contained
syntax keyword githubIssueCommentFlagOutdated  OUTDATED  contained
syntax keyword githubIssueCommentFlagResolved  RESOLVED  contained
syntax keyword githubIssueCommentFlagDuplicate DUPLICATE contained
syntax keyword githubIssueCommentFlagSpam      SPAM      contained

" ---------------------------------------------
"  ハイライト

" タイトルセクション関連
highlight link githubIssueTitle              Title
highlight link githubIssueTitleMarkerStart   Label

highlight link githubIssueNumber             Number
highlight link githubIssueStateOpen          Normal
highlight link githubIssueStateClosed        WarningMsg

" メタ情報セクション関連
highlight link githubIssueMeta               Normal
highlight link githubIssueMetaMarkerStart    Label
highlight link githubIssueMetaKey            Define
highlight link githubIssueMetaDelimiter      Delimiter
highlight link githubIssueMetaValue          String

" 本文セクション関連
highlight link githubIssueBody               Normal
highlight link githubIssueBodyMarkerStart    Label

" コメントセクション関連
highlight link githubIssueCommentMarkerStart   Label
highlight link githubIssueCommentCount         Number
highlight link githubIssueCommentMeta          Label
highlight link githubIssueCommentMetaNumber    Number
highlight link githubIssueCommentMetaAuthor    Identifier
highlight link githubIssueCommentFlag          Type
highlight link githubIssueCommentFlagEdited    Keyword
highlight link githubIssueCommentFlagAuthor    Keyword
highlight link githubIssueCommentFlagOwner     Keyword
highlight link githubIssueCommentFlagAbuse     Keyword
highlight link githubIssueCommentFlagOffTopic  Keyword
highlight link githubIssueCommentFlagOutdated  Keyword
highlight link githubIssueCommentFlagResolved  Keyword
highlight link githubIssueCommentFlagDuplicate Keyword
highlight link githubIssueCommentFlagSpam      Keyword