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emacs event log (WIP)

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README.org

sauron

WARNING sauron is in its early stages of development. Okay, now I warned you.

what is it?

sauron is an emacs mode for keeping track of events happening in the (emacs) world around you. Events are things like ‘appointment in 5 minutes’, ‘bob pinged you on IRC’, ‘torrent download is complete’ etc. Sauron shows those events like a list – basically like a log. You can ‘activate’ an event by either pressing RET when point is on it, or clicking it with the middle mouse button (<mouse-2>).

When activated, it can execute some arbitrary function – for example in the case of IRC (ERC), it will switch you to the buffer (channel) it originated from. It’s a bit of a generalization of what tracking mode does in ERC (the emacs IRC client), and that is in fact how it started.

For my work, I need to keep track of a bunch of internal ERC (IRC) channels and at the same time not forget to go to meetings, even when I’m concentrating on something else. So, I want something tweakable to provide me with the right balance between obnoxiousness and ignorability. Thus, sauron was born.

There’s an increasing number of hooks and tunables in sauron, which allows you to fine-tune the behavior. However, I strive for it to be useful with minimal configuration.

getting started

After you’ve put the various sauron files in a directory, you can enable it with something like the following in your .emacs:

;; set load path, obviously replace “<path-to-sauron-dir>” with the actual path… #+being_example

  (add-to-list 'load-path "<path-to-sauron-dir>")
  (require 'sauron)

#end_example

Now, you can start sauron with… M-x sauron-start, and stop it with M-x sauron-stop.

sauron-start will pop-up a new frame (window) which will show events coming from any of its sources (i.e.., ERC, org-mode appointments and over d-bus). You can ‘activate’ a source by pressing “Enter” with the cursor on the event, which will then take some backend-specific action.

For example, for the ERC-backend, it will transfer you to the buffer (IRC-channel) where said event happened.

You can clear all events with M-x sauron-clear (default keybinding: c).

Sauron (by default) loads the sauron-erc, sauron-org and sauron-dbus modules; if you don’t have ERC, org-mode or d-bus support, these will simply be ignored. If so desired, you can customize sauron-modules. See below for some specifics about the backends.

customization

I’ve tried hard to come up with reasonable defaults, such that users can get started with sauron without reading too much documentation or having to write emacs-lisp etc.; still, I’ve also tried to make sauron very configurable - different people have different needs, so it should be possible to coerce the software in whatever direction.

Below are some customization points.

priorities – sauron-min-priority

Each event in sauron has a certain priority. Sauron ignores all events which have a priority that is lower that sauron-min-priority (default value: 3).

For example, all messages written on IRC (i.e., coming from the ERC-backend) which are not directed towards you have priority 2 – you will not see them. And that is probably a good idea.

watching patterns – sauron-watch-patterns

You can specify a list of patterns (regular expressions) which sauron should check. An event matching any of the patterns in the list will have its priority raised by 1 point. If that one point raises it to `sauron-min-priority’ or higher level, it will now show up in the Sauron buffer.

sauron-watch-patterns is useful if you want to check if, for example, your name, or your hobby project is mentioned in some IRC channel.

So, for example, as part of your settings:

:;; watch for some animals
:(setq sauron-watch-patterns
:  '("\\bgnu\\b" "yak" "capybara" "wombat"))

watching nicks – sauron-watch-nicks

You can also specify a list of nicks to watch for; nicks are matched using a string-match (not a regular expression). A nick matching any of the nicks in the list will have its priority raised by 1 point. If that one point raises it to `sauron-min-priority’ or higher level, it will now show up in the Sauron buffer.

don’t get swamped by a certain nick

Since you may not want to get too many events from one nick – and, who knows, accompanying sound effects, pop-ups and what have you, you can set some insensitivity time; events from the same nick during this time will be lowered in priority by one point.

You can set the time period (in seconds) with `sauron-nick-insensitivity’, which defaults to 60 seconds.

blocking events from showing up – sauron-event-block-functions

We can customize things even more precisely using the sauron-event-block-functions hook function. Any event with a priority >= sauron-min-priority will be passed to the hook function(s); if any of those functions returns non-nil, the event will be blocked. See the emacs documentation for a general introduction to hook functions, here’s an example:

    :(add-hook 'sauron-event-block-functions
:  (lambda (origin prio msg &optional props)
:    (or
:      (string-match "foo" msg) ;; ignore events that match 'foo'
:      ;; other matchers
:     )))

Note that the props parameter is a backend specific property-list, which allows you e.g. (for the ERC-backend) to get the sender of some ERC message, and block based on that.

doing stuff based on events – sauron-event-added-functions

After events have been added, another hook is called: sauron-event-added-functions.

This is place to add sound effects, notifications and so on. After all, if you get an event for e.g. the org-mode backend that you have a meeting to attend in 5 minutes, simply adding a line in the Sauron-buffer may not be enough.

Instead, you can define a hook function for this.

For doing very sound effects, pop-ups etc., a few convenience functions are provided:

  • sauron-fx-sox (play a sound using ‘sox’)
  • sauron-fx-aplay (play a sound using ‘aplay’)
  • sauron-fx-gnome-osd (show some letters on your screen)
  • sauron-fx-zenity (pop up a zenity window)
  • sauron-fx-notify (trigger a notification using the D-Bus notification daemon)

(see the doc-strings for the functions for the details about their parameters).

Now, our hook function could look something like:

:(add-hook 'sauron-event-added-functions
:  (lambda (origin prio msg &optional props)
:    (if (string-match "ping" msg)
:      (sauron-fx-sox "/usr/share/sounds/ping.wav")
:      (sauron-fx-sox "/usr/share/sounds/something-happened.wav"))
:    (when (>= prio 4)
:	(sauron-fx-sox "/usr/share/sounds/uhoh.wav")
:	(sauron-fx-gnome-osd msg 10))))

changing the looks of the sauron buffer

You can customize the columns shown in the sauron buffer by setting sauron-column-alist - see its documentation.

connecting to alert.el

John Wiegley’s alert.el has a bit of overlap with sauron; however, I’ve added some wrapper function to make it trivial to feed sauron events into alert. Simply adding:

(add-hook ‘sauron-event-added-functions ‘sauron-alert-el-adapter)

in your setup should do the trick (of course. alert.el must be loaded).

the backend modules

Currently, three backend modules have been implemented - ERC, org-mode and d-bus. Hopefully, more will follow.

erc

The ERC module check all IRC PRIVMSG messages, and JOIN/LEAVE/QUIT messages. PRIVMSG includes the messages sent to any channel by anyone. These message are given (by default) priority 2, so (by default) they do not show up in your sauron buffer.

However, messages that match one of your sauron-watch-patterns or sauron-watch-nicks are getting a higher priority, or messages that are private messages directed at you. However, after sending a message, you won’t get notified from the same nick for another 60 seconds (by default – see sauron-nick-insensitivity), so you won’t get e.g. sound effects for each message in a private conversation.

org-mode / appt

For org-mode, sauron adds functionality to appt-disp-window-function (but leaves it intact), so that whenever some event is near, you get a notification with the following priorities:

  • 15 minutes left: priority 3
  • 10 minutes left: priority 3
  • 5 minutes left: priority 4
  • 2 minutes left: priority 5

For all other minutes, you’ll get events with priority 2.

You should load org before starting sauron, in particular before you set appt-disp-window-function, as sauron-org uses that same function (it will preserve the existing functionality though).

d-bus

The dbus backend allows you to get events from outside emacs; it listens for two messages, AddUrlEvent and AddMsgEvent. You can call them like this:

:    dbus-send --session --dest="org.gnu.Emacs"	   \
:    "/org/gnu/Emacs/Sauron"                       \
:    "org.gnu.Emacs.Sauron.AddUrlEvent"            \
:    string:shell uint32:3 string:"Link: Emacs-Fu" \
:    string:"http://emacs-fu.blogspot.com"

The four parameters are resp. the sender (‘shell’), the priority (‘3’ in the example), a description and a URL. This will show up in the sauron buffer (if the priority is high enough), and if you activate the event (press RET), your browser will visit the link.

:    dbus-send --session          	          \
:    --dest="org.gnu.Emacs"	                  \
:     "/org/gnu/Emacs/Sauron"                     \
:    "org.gnu.Emacs.Sauron.AddMsgEvent"           \
:    string:shell uint32:3 string:"Hello, world!"

The three parameters are resp. the sender (‘shell’), the priority (‘3’ in the example), and message. This will show up in the sauron buffer (if the priority is high enough).

One use for these kind of messages is to warn you when for example a torrent has been completed in ‘Transmission’. In the torrent-completion script (see Preferences/ Call-script-when-torrent-is-completed), add something like:

:    dbus-send --session          	          \
:    --dest="org.gnu.Emacs"	                  \
:     "/org/gnu/Emacs/Sauron"                     \
:    "org.gnu.Emacs.Sauron.AddMsgEvent"           \
:    string:Transmission uint32:3 string:"Torrent completed: $TR_TORRENT_NAME"

I’m sure you can think of other useful applications.

Using D-Bus outside your session

Note, you normally only use D-Bus (i.e.., the d-bus session bus) when you are in the same session – say, your desktop environment. Thus, it is generally not possible to send yourself D-Bus messages from programs outside your session, for example something running from crontab.

For this, if you set sauron-dbus-cookie to non-nil (before starting sauron), it will drop a file ~/.sauron-dbus which contains the D-Bus session bus address (DBUS_SESSION_BUS_ADDRESS). Using this address you can, in fact, send messages to sauron from outside your session, by doing something like in the previous examples, but first setting DBUS_SESSION_BUS_ADDRESS:

:DBUS_SESSION_BUS_ADDRESS="`cat ~/.sauron-dbus`" dbus-send ....

We don’t write ~/.sauron-dbus as their may be security downsides to this - even though normally other users are not allowed to send to ‘your’ session bus, even with the cookie, it’s always good to be a bit paranoid.

adding new modules

It may be interesting to track other modules as well; this shouldn’t be too hard. Suppose we have a module ‘foo’:

  • create “sauron-foo.el”, and make sure it’s in the load-path
  • sauron-foo should implement at least:
    • sauron-foo-start to start the module
    • sauron-foo-stop to stop the module / cleanup etc.
  • add sauron-foo.el with (provide 'sauron-foo)
  • now, add sauron-foo to your sauron-modules

Now, to actually make your module useful, you’d want to add some event is something happens. This is done using sauron-add-event (see it’s documentation).

Using sauron from your other modules

If you want to create simple sauron-events from other elisp code, writing a backend modules might be unnecessary; you can simply call the sauron-add-event function directly. See its docstring for the details. Example:

:(sauron-add-event
:   'kitchen           ;; origin
:   3                  ;; priority
:   "Coffee is ready!"
:   '(lambda ()        ;; function called when activated
:      (message "Coffee's ready, get it while it's hot!"))
:   '(:temperature 80)) ;; arbitrary props passed to
:                       ;; hook functions

A typical pattern may also be to switch to the buffer of origin when the event is activated. The sauron-switch-to-buffer function may be useful there, as it tries to ensure that the buffer is shown in the other frame (not the one with Sauron).

sample configuration

:(require 'sauron)
:
: ;; note, you add (setq sauron-debug t) to get errors which can debug if
: ;; there's something wrong; normally, we catch such errors, since e.g an error
: ;; in one of the hooks may cause ERC to fail (i.e., the message won't come
: ;; trough).
:
:(setq
:  sauron-max-line-length 120
:
:  ;; you probably want to add your own nickname to the these patterns
:  sauron-watch-patterns
:  '("emacs-fu" "emacsfu" "wombat" "capybara" "yak" "gnu" "\\bmu\\b")
:
:  ;; you probably want to add you own nick here as well
:  sauron-watch-nicks
:  '("Tom" "Dick" "Harry"))
:
:;; some sound/light effects for certain events
:(add-hook 'sauron-event-added-functions
:  (lambda (origin prio msg &optional props)
:    (if (string-match "ping" msg)
:      (sauron-fx-sox "/usr/share/sounds/ping.wav"))
:    (cond
:      ((= prio 3) (sauron-fx-sox "/usr/share/sounds/pling.wav"))
:      ((= prio 4) (sauron-fx-sox "/usr/share/sounds/plong.wav"))
:      ((= prio 5)
:	(sauron-fx-sox "/usr/share/sounds/alarm.wav")
:	(sauron-fx-gnome-osd(format "%S: %s" origin msg) 5)))))
:
:;; events to ignore
:(add-hook 'sauron-event-block-functions
:  (lambda (origin prio msg &optional props)
:    (or
:      (string-match "^*** Users" msg)))) ;; don't notify on IRC spam
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