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diff --git a/autoload/coc/source/khard.vim b/autoload/coc/source/khard.vim
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+++ b/autoload/coc/source/khard.vim
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+" global contacts list
+let s:contacts = []
+
+function! coc#source#khard#init() abort
+	" read contacts once on init
+	for line in systemlist('khard email --remove-first-line --parsable')
+		let [address, name, type] = split(line, "\t")
+		call add(s:contacts, printf('%s <%s>', name, address))
+	endfor
+
+	" plugin config
+	return {
+				\ 'priority': 9,
+				\ 'shortcut': 'khard',
+				\ 'filetypes': ['mail'],
+				\}
+endfunction
+
+function coc#source#khard#should_complete(option)
+	" only complete addresses on to, cc, bcc and reply-to header lines
+	return tolower(a:option['line']) =~ '^\(to\|cc\|bcc\|reply-to\):'
+endfunction
+
+function! coc#source#khard#complete(option, cb) abort
+	" init already loaded all the contacts, just forward them to CoC
+	call a:cb(s:contacts)
+endfunction
+
diff --git a/license b/license
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+++ b/license
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+MIT License
+
+Copyright (c) 2024 lonkaars
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/readme.md b/readme.md
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+This adds a completion source for [coc.nvim][coc] that autocompletes email
+addresses for `ft=mail` buffers using khard.
+
+## installation (vim-plug)
+
+```
+Plug 'lonkaars/coc-khard'
+```
+
+[coc]: https://github.com/neoclide/coc.nvim
+