[vim] add plugin for golang

1 files changed, 138 insertions, 0 deletions

diff --git a/vim/plugin/godoc.vim b/vim/plugin/godoc.vim
new file mode 100644
index 0000000..0c2c5c9
--- /dev/null
+++ b/vim/plugin/godoc.vim
@@ -0,0 +1,138 @@
+" Copyright 2011 The Go Authors. All rights reserved.
+" Use of this source code is governed by a BSD-style
+" license that can be found in the LICENSE file.
+"
+" godoc.vim: Vim command to see godoc.
+"
+"
+" Commands:
+"
+"   :Godoc
+"
+"       Open the relevant Godoc for either the word[s] passed to the command or
+"       the, by default, the word under the cursor.
+"
+" Options:
+"
+"   g:go_godoc_commands [default=1]
+"
+"       Flag to indicate whether to enable the commands listed above.
+
+if exists("g:loaded_godoc")
+  finish
+endif
+let g:loaded_godoc = 1
+
+let s:buf_nr = -1
+let s:last_word = ''
+
+if !exists('g:go_godoc_commands')
+  let g:go_godoc_commands = 1
+endif
+
+if g:go_godoc_commands
+  command! -nargs=* -range -complete=customlist,go#complete#Package Godoc :call s:Godoc(<f-args>)
+endif
+
+nnoremap <silent> <Plug>(godoc-keyword) :<C-u>call <SID>Godoc('')<CR>
+
+function! s:GodocView()
+  if !bufexists(s:buf_nr)
+    leftabove new
+    file `="[Godoc]"`
+    let s:buf_nr = bufnr('%')
+  elseif bufwinnr(s:buf_nr) == -1
+    leftabove split
+    execute s:buf_nr . 'buffer'
+    delete _
+  elseif bufwinnr(s:buf_nr) != bufwinnr('%')
+    execute bufwinnr(s:buf_nr) . 'wincmd w'
+  endif
+
+  setlocal filetype=godoc
+  setlocal bufhidden=delete
+  setlocal buftype=nofile
+  setlocal noswapfile
+  setlocal nobuflisted
+  setlocal modifiable
+  setlocal nocursorline
+  setlocal nocursorcolumn
+  setlocal iskeyword+=:
+  setlocal iskeyword-=-
+
+  nnoremap <buffer> <silent> K :Godoc<cr>
+
+  au BufHidden <buffer> call let <SID>buf_nr = -1
+endfunction
+
+function! s:GodocNotFound(content)
+  if !len(a:content)
+    return 1
+  endif
+
+  return a:content =~# '^.*: no such file or directory\n'
+endfunction
+
+function! s:GodocWord(word)
+  if !executable('godoc')
+    echohl WarningMsg
+    echo "godoc command not found."
+    echo "  install with: go get code.google.com/p/go.tools/cmd/godoc"
+    echohl None
+    return 0
+  endif
+  let word = a:word
+  silent! let content = system('godoc ' . word)
+  if v:shell_error || !len(content)
+    if len(s:last_word)
+      silent! let content = system('godoc ' . s:last_word.'/'.word)
+      if v:shell_error || s:GodocNotFound(content)
+        echo 'No documentation found for "' . word . '".'
+        return 0
+      endif
+      let word = s:last_word.'/'.word
+    else
+      echo 'No documentation found for "' . word . '".'
+      return 0
+    endif
+  endif
+  let s:last_word = word
+  silent! call s:GodocView()
+  setlocal modifiable
+  silent! %d _
+  silent! put! =content
+  silent! normal gg
+  setlocal nomodifiable
+  setfiletype godoc
+  return 1
+endfunction
+
+function! s:Godoc(...)
+  if !len(a:000)
+    let oldiskeyword = &iskeyword
+    setlocal iskeyword+=.
+    let word = expand('<cword>')
+    let &iskeyword = oldiskeyword
+    let word = substitute(word, '[^a-zA-Z0-9\\/._~-]', '', 'g')
+    let words = split(word, '\.\ze[^./]\+$')
+  else
+    let words = a:000
+  endif
+  if !len(words)
+    return
+  endif
+  if s:GodocWord(words[0])
+    if len(words) > 1
+      if search('^\%(const\|var\|type\|\s\+\) ' . words[1] . '\s\+=\s')
+        return
+      endif
+      if search('^func ' . words[1] . '(')
+        silent! normal zt
+        return
+      endif
+      echo 'No documentation found for "' . words[1] . '".'
+    endif
+  endif
+endfunction
+
+" vim:ts=4:sw=4:et