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diff --git a/.config/nvim/autoload/mailcomplete.vim b/.config/nvim/autoload/mailcomplete.vim
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+++ b/.config/nvim/autoload/mailcomplete.vim
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+" This is based on (that is, mostly copy-pasted from) [here][1], but uses Khard [2] rather
+" than GooBook [3].  Also see `:h 'omnifunc'`.  TODO: maybe prettify this a bit.  TODO:
+" consider whether there's something worth stealing from how Greg Hurrell set up
+" autocompletion.  See [4], [5], [6], etc.
+function! mailcomplete#Complete(findstart, base)
+   if a:findstart == 1
+      let line = getline('.')
+      let idx = col('.')
+      while idx > 0
+         let idx -= 1
+         let c = line[idx]
+         if c == ':' || c == '>'
+            return idx + 2
+         else
+            continue
+         endif
+      endwhile
+      return idx
+   else
+      return split(system('khard email -p --remove-first-line ' . a:base .
+                        \ ' | awk -F "\t" ''{ print $2" <"$1">" }'''), '\n')
+   endif
+endfunction
+
+" [1]: https://web.archive.org/web/20160915070551/http://www.recursivedream.com/blog/2012/auto-completing-google-contacts-in-vim
+" [2]: https://github.com/scheibler/khard
+" [3]: https://gitlab.com/goobook/goobook
+" [4]: https://youtu.be/9zffUQsbxgE "Vim screencast #49: Sending email with vim"
+" [5]: https://youtu.be/VBLh56J89do "Vim screencast #51: Composing email"
+" [6]: https://youtu.be/BNnSjJOpXDk "Vim screencast #58: deoplete.nvim"
+" [7]: https://github.com/wincent/wincent/blob/9350820fd0fe/roles/dotfiles/files/.vim/plugin/autocomplete.vim#L46-L74
+" [8]: https://github.com/wincent/ycmd/commit/cb90aa61dcd8135351bb8afd7c39e90d653313c5
+" [9]: https://github.com/fszymanski/deoplete-abook