Merge pull request #13426 from lujun9972/add-MjAxODA4MzEgR2V0IGRlc2t0b3Agbm90aWZpY2F0aW9ucyBmcm9tIEVtYWNzIHNoZWxsIGNvbW1hbmRzIC5tZAo=

选题: 20180831 Get desktop notifications from Emacs shell commands ·

sources/tech/20180831 Get desktop notifications from Emacs shell commands .md

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+[#]: collector: (lujun9972)
+[#]: translator: (lujun9972)
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Get desktop notifications from Emacs shell commands ·)
+[#]: via: (https://blog.hoetzel.info/post/eshell-notifications/)
+[#]: author: (Jürgen Hötzel https://blog.hoetzel.info)
+
+Get desktop notifications from Emacs shell commands ·
+======
+When interacting with the operating systems I always use [Eshell][1] because it integrates seamlessly with Emacs, supports (remote) [TRAMP][2] file names and also works nice on Windows.
+
+After starting shell commands (like long running build jobs) I often lose track the task when switching buffers.
+
+Thanks to Emacs [hooks][3] mechanism you can customize Emacs to call a elisp function when an external command finishes.
+
+I use [John Wiegleys][4] excellent [alert][5] package to send desktop notifications:
+
+```
+(require 'alert)
+
+(defun eshell-command-alert (process status)
+  "Send `alert' with severity based on STATUS when PROCESS finished."
+  (let* ((cmd (process-command process))
+       (buffer (process-buffer process))
+       (msg (format "%s: %s" (mapconcat 'identity cmd " ")  status)))
+    (if (string-prefix-p "finished" status)
+      (alert msg :buffer buffer :severity  'normal)
+    (alert msg :buffer buffer :severity 'urgent))))
+
+(add-hook 'eshell-kill-hook #'eshell-command-alert)
+```
+
+[alert][5] rules can be setup programmatically. In my case I only want to get notified if the corresponding buffer is not visible:
+
+```
+(alert-add-rule :status   '(buried)     ;only send alert when buffer not visible
+          :mode     'eshell-mode
+          :style 'notifications)
+```
+
+This even works on [TRAMP][2] buffers. Below is a screenshot showing a Gnome desktop notification of a failed `make` command.
+
+![../../img/eshell.png][6]
+
+--------------------------------------------------------------------------------
+
+via: https://blog.hoetzel.info/post/eshell-notifications/
+
+作者：[Jürgen Hötzel][a]
+选题：[lujun9972][b]
+译者：[lujun9972](https://github.com/lujun9972)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://blog.hoetzel.info
+[b]: https://github.com/lujun9972
+[1]: https://www.gnu.org/software/emacs/manual/html_mono/eshell.html (Eshell)
+[2]: https://www.gnu.org/software/tramp/ (TRAMP)
+[3]: https://www.gnu.org/software/emacs/manual/html_node/emacs/Hooks.html (hooks)
+[4]: https://github.com/jwiegley (John Wiegleys)
+[5]: https://github.com/jwiegley/alert (alert)
+[6]: https://blog.hoetzel.info/img/eshell.png (../../img/eshell.png)