# -*- 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")
           (beginning-of-buffer)
           (when (search-forward "(define-public " nil 'noerror)
             (thing-at-point 'sexp 'no-properties)))`}: Update to ${2:`(with-temp-buffer
    (magit-git-wash #'magit-diff-wash-diffs
      "diff" "--staged")
    (beginning-of-buffer)
    (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")`'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>refs</a><a class='active' href='/guix/log/etc/historical-authorizations'>log</a><a href='/guix/tree/etc/historical-authorizations?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>tree</a><a href='/guix/commit/etc/historical-authorizations?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>commit</a><a href='/guix/diff/etc/historical-authorizations?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/historical-authorizations'>
<input type='hidden' name='id' value='c4031f909f0d67fa56887add01388b55e23a5a7c'/><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=c4031f909f0d67fa56887add01388b55e23a5a7c'>root</a>/<a href='/guix/log/etc?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>etc</a>/<a href='/guix/log/etc/historical-authorizations?id=c4031f909f0d67fa56887add01388b55e23a5a7c'>historical-authorizations</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/historical-authorizations?id=c4031f909f0d67fa56887add01388b55e23a5a7c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-11 11:51:56 +0200'>2020-07-11</span></td><td><a href='/guix/commit/etc/historical-authorizations?id=4b9b8b2ec23e59af2275a6d2829e6e0f915b44b3'>Add 'etc/historical-authorizations'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>