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.vim/autoload/xolox/misc/complete.vim

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+" Tab completion for user defined commands.
+"
+" Author: Peter Odding <peter@peterodding.com>
+" Last Change: July 9, 2014
+" URL: http://peterodding.com/code/vim/misc/
+
+function! xolox#misc#complete#keywords(arglead, cmdline, cursorpos)
+  " This function can be used to perform keyword completion for user defined
+  " Vim commands based on the contents of the current buffer. Here's an
+  " example of how you would use it:
+  "
+  "     :command -nargs=* -complete=customlist,xolox#misc#complete#keywords MyCmd call s:MyCmd(<f-args>)
+  let words = {}
+  for line in getline(1, '$')
+    for word in split(line, '\W\+')
+      let words[word] = 1
+    endfor
+  endfor
+  let arguments = [keys(filter(words, 'v:key =~# a:arglead'))]
+  if &ignorecase
+    call add(arguments, 1)
+  endif
+  return call('sort', arguments)
+endfunction
+
+" vim: ts=2 sw=2 et