From b32e2105866c3d43c522123ef6d63da7578fb3da Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Wed, 3 Aug 2011 16:46:35 +1000
Subject: [PATCH] misc/vim: Godoc command. vim command 'Godoc' to see godoc.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4815071
---
 misc/vim/ftplugin/go/godoc.vim |  13 ++++
 misc/vim/plugin/godoc.vim      | 123 +++++++++++++++++++++++++++++++++
 misc/vim/readme.txt            |  11 +++
 misc/vim/syntax/godoc.vim      |  20 ++++++
 4 files changed, 167 insertions(+)
 create mode 100644 misc/vim/ftplugin/go/godoc.vim
 create mode 100644 misc/vim/plugin/godoc.vim
 create mode 100644 misc/vim/syntax/godoc.vim

diff --git a/misc/vim/ftplugin/go/godoc.vim b/misc/vim/ftplugin/go/godoc.vim
new file mode 100644
index 00000000000..55195a674d8
--- /dev/null
+++ b/misc/vim/ftplugin/go/godoc.vim
@@ -0,0 +1,13 @@
+" 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.
+
+if exists("b:did_ftplugin")
+    finish
+endif
+
+silent! nmap <buffer> <silent> K <Plug>(godoc-keyword)
+
+" vim:ts=4:sw=4:et
diff --git a/misc/vim/plugin/godoc.vim b/misc/vim/plugin/godoc.vim
new file mode 100644
index 00000000000..5d7ce14ad30
--- /dev/null
+++ b/misc/vim/plugin/godoc.vim
@@ -0,0 +1,123 @@
+" 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.
+
+if exists("g:loaded_godoc")
+  finish
+endif
+let g:loaded_godoc = 1
+
+let s:buf_nr = -1
+let s:last_word = ''
+let s:goos = $GOOS
+let s:goarch = $GOARCH
+
+function! s:GodocView()
+  if !bufexists(s:buf_nr)
+    leftabove new
+    file `="[Godoc]"`
+    let s:buf_nr = bufnr('%')
+  elseif bufwinnr(s:buf_nr) == -1
+    leftabove split
+    execute s:buf_nr . 'buffer'
+    delete _
+  elseif bufwinnr(s:buf_nr) != bufwinnr('%')
+    execute bufwinnr(s:buf_nr) . 'wincmd w'
+  endif
+
+  setlocal filetype=godoc
+  setlocal bufhidden=delete
+  setlocal buftype=nofile
+  setlocal noswapfile
+  setlocal nobuflisted
+  setlocal modifiable
+  setlocal nocursorline
+  setlocal nocursorcolumn
+  setlocal iskeyword+=:
+  setlocal iskeyword-=-
+
+  nnoremap <buffer> <silent> K :Godoc<cr>
+
+  au BufHidden <buffer> call let <SID>buf_nr = -1
+endfunction
+
+function! s:GodocWord(word)
+  let word = a:word
+  silent! let content = system('godoc ' . word)
+  if v:shell_error || !len(content)
+    if len(s:last_word)
+      silent! let content = system('godoc ' . s:last_word.'/'.word)
+      if v:shell_error || !len(content)
+        echo 'No documentation found for "' . word . '".'
+        return
+      endif
+      let word = s:last_word.'/'.word
+    else
+      echo 'No documentation found for "' . word . '".'
+      return
+    endif
+  endif
+  let s:last_word = word
+  silent! call s:GodocView()
+  setlocal modifiable
+  silent! %d _
+  silent! put! =content
+  silent! normal gg
+  setlocal nomodifiable
+  setfiletype godoc
+endfunction
+
+function! s:Godoc(...)
+  let word = join(a:000, ' ')
+  if !len(word)
+    let word = expand('<cword>')
+  endif
+  let word = substitute(word, '[^a-zA-Z0-9\/]', '', 'g')
+  if !len(word)
+    return
+  endif
+  call s:GodocWord(word)
+endfunction
+
+function! s:GodocComplete(ArgLead, CmdLine, CursorPos)
+  if len($GOROOT) == 0
+    return []
+  endif
+  if len(s:goos) == 0
+    if exists('g:godoc_goos')
+      let s:goos = g:godoc_goos
+    elseif has('win32') || has('win64')
+      let s:goos = 'windows'
+    elseif has('macunix')
+      let s:goos = 'darwin'
+    else
+      let s:goos = '*'
+    endif
+  endif
+  if len(s:goarch) == 0
+    if exists('g:godoc_goarch')
+      let s:goarch = g:godoc_goarch
+    else
+      let s:goarch = g:godoc_goarch
+    endif
+  endif
+  let ret = {}
+  let root = expand($GOROOT.'/pkg/'.s:goos.'_'.s:goarch)
+  for i in split(globpath(root, a:ArgLead.'*'), "\n")
+    if isdirectory(i)
+      let i .= '/'
+    elseif i !~ '\.a$'
+      continue
+    endif
+    let i = substitute(substitute(i[len(root)+1:], '[\\]', '/', 'g'), '\.a$', '', 'g')
+    let ret[i] = i
+  endfor
+  return sort(keys(ret))
+endfunction
+
+command! -nargs=* -range -complete=customlist,s:GodocComplete Godoc :call s:Godoc(<q-args>)
+nnoremap <silent> <Plug>(godoc-keyword) :<C-u>call <SID>Godoc('')<CR>
+
+" vim:ts=4:sw=4:et
diff --git a/misc/vim/readme.txt b/misc/vim/readme.txt
index 3c3255113b3..e6bdf0e116d 100644
--- a/misc/vim/readme.txt
+++ b/misc/vim/readme.txt
@@ -48,3 +48,14 @@ To install automatic indentation for Go:
   3. Add the following line to your .vimrc file (normally $HOME/.vimrc):
 
      filetype indent on
+
+
+Godoc plugin
+============
+
+To install godoc plugin:
+
+  1. Same as 1 above.
+  2. Copy or link plugin/godoc.vim to $HOME/.vim/plugin/godoc,
+     syntax/godoc.vim to $HOME/.vim/syntax/godoc.vim,
+     and ftplugin/go/godoc.vim to $HOME/.vim/ftplugin/go/godoc.vim.
diff --git a/misc/vim/syntax/godoc.vim b/misc/vim/syntax/godoc.vim
new file mode 100644
index 00000000000..82f78aa3c38
--- /dev/null
+++ b/misc/vim/syntax/godoc.vim
@@ -0,0 +1,20 @@
+" 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.
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn case match
+syn match  godocTitle "^\([A-Z]*\)$"
+
+command -nargs=+ HiLink hi def link <args>
+
+HiLink godocTitle Title
+
+delcommand HiLink
+
+let b:current_syntax = "godoc"
+
+" vim:ts=4 sts=2 sw=2: