# -*- mode: snippet -*-
# name: guix-commit-message-update-package
# key: update
# condition: git-commit-mode
# --

gnu: ${1:`(with-temp-buffer
           (magit-git-wash #'magit-diff-wash-diffs
             "diff" "--staged")
           (goto-char (point-min))
           (when (re-search-forward "(define-public \\(\\S-+\\)" nil 'noerror)
             (match-string-no-properties 1)))`}: Update to ${2:`(with-temp-buffer
    (magit-git-wash #'magit-diff-wash-diffs
      "diff" "--staged")
    (goto-char (point-min))
    (search-forward "name" nil 'noerror)
    (search-forward "+" nil 'noerror)   ; first change
    (when (and (search-forward "version " nil 'noerror)
               (looking-at-p "\""))
      (let ((end (save-excursion (search-forward "\")" nil 'noerror))))
        (when end
          (forward-char)
          (buffer-substring-no-properties (point) (- end 2))))))`}.

* `(car (magit-staged-files))` ($1): Update to $2.$0
`(mapconcat (lambda (file) (concat "* " file)) (cdr (magit-staged-files)) "\n")`ix/'>summary</a><a href='/guix/refs/?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>refs</a><a class='active' href='/guix/log/etc/git'>log</a><a href='/guix/tree/etc/git?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>tree</a><a href='/guix/commit/etc/git?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>commit</a><a href='/guix/diff/etc/git?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/git'>
<input type='hidden' name='id' value='2a9784ffa247bb2580346b7ce1d3f23c302459a3'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>root</a>/<a href='/guix/log/etc?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>etc</a>/<a href='/guix/log/etc/git?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3'>git</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/git?id=2a9784ffa247bb2580346b7ce1d3f23c302459a3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-14 12:15:06 -0500'>2020-12-14</span></td><td><a href='/guix/commit/etc/git?id=80ebcdd100a82fdc582e62f35042c74ce38ea753'>maint: Only run `make authenticate` when pushing commits.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2020-06-01 00:51:38 +0200'>2020-06-01</span></td><td><a href='/guix/commit/etc/git?id=6f6758c45d3913dbf98bb8e50f21f7bfb25b40ea'>maint: Adjust comment in 'pre-push' hook.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-29 18:31:38 +0200'>2020-05-29</span></td><td><a href='/guix/commit/etc/git?id=e65a44649e8d7698c4a888f1de625a67052520e9'>maint: Git pre-push hook runs "make authenticate check-channel-news".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>