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+" Vim plugin for showing matching parens
+" Maintainer:  Bram Moolenaar <Bram@vim.org>
+" Last Change: 2006 Feb 27
+
+" Exit quickly when:
+" - this plugin was already loaded (or disabled)
+" - when 'compatible' is set
+" - the "CursorMoved" autocmd event is not availble.
+if exists("g:loaded_matchparen") || &cp || !exists("##CursorMoved")
+  finish
+endif
+let g:loaded_matchparen = 1
+
+augroup matchparen
+  " Replace all matchparen autocommands
+  autocmd! CursorMoved,CursorMovedI * call s:Highlight_Matching_Pair()
+augroup END
+
+let s:paren_hl_on = 0
+
+" Skip the rest if it was already done.
+if exists("*s:Highlight_Matching_Pair")
+  finish
+endif
+
+" The function that is invoked (very often) to define a ":match" highlighting
+" for any matching paren.
+function! s:Highlight_Matching_Pair()
+  " Remove any previous match.
+  if s:paren_hl_on
+    match none
+    let s:paren_hl_on = 0
+  endif
+
+  " Get the character under the cursor and check if it's in 'matchpairs'.
+  let c_lnum = line('.')
+  let c_col = col('.')
+  let before = 0
+
+  let c = getline(c_lnum)[c_col - 1]
+  let plist = split(&matchpairs, ':\|,')
+  let i = index(plist, c)
+  if i < 0
+    " not found, in Insert mode try character before the cursor
+    if c_col > 1 && (mode() == 'i' || mode() == 'R')
+      let before = 1
+      let c = getline(c_lnum)[c_col - 2]
+      let i = index(plist, c)
+    endif
+    if i < 0
+      " not found, nothing to do
+      return
+    endif
+  endif
+
+  " Figure out the arguments for searchpairpos().
+  " Restrict the search to visible lines with "stopline".
+  if i % 2 == 0
+    let s_flags = 'nW'
+    let c2 = plist[i + 1]
+    let stopline = line('w$')
+  else
+    let s_flags = 'nbW'
+    let c2 = c
+    let c = plist[i - 1]
+    let stopline = line('w0')
+  endif
+  if c == '['
+    let c = '\['
+    let c2 = '\]'
+  endif
+
+  " When not in a string or comment ignore matches inside them.
+  let s_skip ='synIDattr(synID(c_lnum, c_col - before, 0), "name") ' .
+	\ '=~?  "string\\|comment"'
+  execute 'if' s_skip '| let s_skip = 0 | endif'
+
+  " Find the match.  When it was just before the cursor move it there for a
+  " moment.  To restore the cursor position use "N|" and when 'virtualedit'
+  " is set, cursor() otherwise.
+  if before > 0
+    if &ve != ''
+      let vcol = virtcol('.')
+    endif
+    call cursor(c_lnum, c_col - before)
+  endif
+  let [m_lnum, m_col] = searchpairpos(c, '', c2, s_flags, s_skip, stopline)
+  if before > 0
+    if &ve != ''
+      exe 'normal ' . vcol . '|'
+    else
+      call cursor(0, c_col)
+    endif
+  endif
+
+  " If a match is found setup match highlighting.
+  if m_lnum > 0 && m_lnum >= line('w0') && m_lnum <= line('w$')
+    exe 'match MatchParen /\(\%' . c_lnum . 'l\%' . (c_col - before) .
+	  \ 'c\)\|\(\%' . m_lnum . 'l\%' . m_col . 'c\)/'
+    let s:paren_hl_on = 1
+  endif
+endfunction
+
+" Define commands that will disable and enable the plugin.
+command! NoMatchParen match none | unlet! g:loaded_matchparen | au! matchparen
+command! DoMatchParen runtime plugin/matchparen.vim | doau CursorMoved