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#+title: Writing your own plugin
-Writing a plugin for xmobar is very simple!
-
-First, you need to create a data type with at least one constructor.
-Next you must declare this data type an instance of the =Exec= class, by
-defining the one needed method (alternatively =start= or =run=) and 3
-optional ones (=alias=, =rate=, and =trigger=):
-
-#+begin_src haskell
- start :: e -> (String -> IO ()) -> IO ()
- run :: e -> IO String
- rate :: e -> Int
- alias :: e -> String
- trigger :: e -> (Maybe SignalType -> IO ()) -> IO ()
-#+end_src
-
-=start= must receive a callback to be used to display the =String=
-produced by the plugin. This method can be used for plugins that need to
-perform asynchronous actions. See =src/Xmobar/Plugins/PipeReader.hs= for
-an example.
-
-=run= can be used for simpler plugins. If you define only =run= the
-plugin will be run every second. To overwrite this default you just need
-to implement =rate=, which must return the number of tenth of seconds
-between every successive runs. See [[../examples/xmobar.hs][examples/xmobar.hs]] for an example of
-a plugin that runs just once, and [[../src/Xmobar/Plugins/Date.hs][src/Xmobar/Plugins/Date.hs]] for one
-that implements =rate=.
-
-Notice that Date could be implemented as:
-
-#+begin_src haskell
- instance Exec Date where
- alias (Date _ a _) = a
- start (Date f _ r) = date f r
-
- date :: String -> Int -> (String -> IO ()) -> IO ()
- date format r callback = do go
- where go = do
- t <- toCalendarTime =<< getClockTime
- callback $ formatCalendarTime defaultTimeLocale format t
- tenthSeconds r >> go
-#+end_src
-
-Modulo some technicalities like refreshing the time-zone in a clever
-way, this implementation is equivalent to the one you can read in
-=Plugins/Date.hs=.
-
-=alias= is the name to be used in the output template. Default alias
-will be the data type constructor.
-
-After that your type constructor can be used as an argument for the
-Runnable type constructor =Run= in the =commands= list of the
-configuration options.
-
-If your plugin only implements =alias= and =start=, then it is advisable
-to put it into the =Xmobar/Plugins/Monitors= directory and use one of
-the many =run*= functions in [[../src/Xmobar/Plugins/Monitors/Common/Run.hs][Xmobar.Plugins.Monitors.Run]] in order to
-define =start=. The =Exec= instance should then live in
-[[../src/Xmobar/Plugins/Monitors.hs][Xmobar.Plugins.Monitors]].
+*** Writing a plugin
+ Writing a plugin for xmobar is very simple!
+
+ First, you need to create a data type with at least one constructor. Next
+ you must declare this data type an instance of the =Exec= class, by defining
+ the one needed method (alternatively =start= or =run=) and 3 optional ones
+ (=alias=, =rate=, and =trigger=):
+
+ #+begin_src haskell
+ start :: e -> (String -> IO ()) -> IO ()
+ run :: e -> IO String
+ rate :: e -> Int
+ alias :: e -> String
+ trigger :: e -> (Maybe SignalType -> IO ()) -> IO ()
+ #+end_src
+
+ =start= must receive a callback to be used to display the =String= produced by
+ the plugin. This method can be used for plugins that need to perform
+ asynchronous actions. See =src/Xmobar/Plugins/PipeReader.hs= for an example.
+
+ =run= can be used for simpler plugins. If you define only =run= the plugin
+ will be run every second. To overwrite this default you just need to
+ implement =rate=, which must return the number of tenth of seconds between
+ every successive runs. See [[../examples/xmobar.hs][examples/xmobar.hs]] for an example of a plugin
+ that runs just once, and [[../src/Xmobar/Plugins/Date.hs][src/Xmobar/Plugins/Date.hs]] for one that
+ implements =rate=.
+
+ Notice that Date could be implemented as:
+
+ #+begin_src haskell
+ instance Exec Date where
+ alias (Date _ a _) = a
+ start (Date f _ r) = date f r
+
+ date :: String -> Int -> (String -> IO ()) -> IO ()
+ date format r callback = do go
+ where go = do
+ t <- toCalendarTime =<< getClockTime
+ callback $ formatCalendarTime defaultTimeLocale format t
+ tenthSeconds r >> go
+ #+end_src
+
+ Modulo some technicalities like refreshing the time-zone in a clever way,
+ this implementation is equivalent to the one you can read in
+ =Plugins/Date.hs=.
+
+ =alias= is the name to be used in the output template. Default alias will be
+ the data type constructor.
+
+ After that your type constructor can be used as an argument for the
+ Runnable type constructor =Run= in the =commands= list of the configuration
+ options.
+
+ If your plugin only implements =alias= and =start=, then it is advisable to
+ put it into the =Xmobar/Plugins/Monitors= directory and use one of the many
+ =run*= functions in [[../src/Xmobar/Plugins/Monitors/Common/Run.hs][Xmobar.Plugins.Monitors.Run]] in order to define
+ =start=. The =Exec= instance should then live in [[../src/Xmobar/Plugins/Monitors.hs][Xmobar.Plugins.Monitors]].
*** Using a Plugin
- To use your new plugin, you need to use a pure Haskell
- configuration for xmobar, and load your definitions there. You can
- see an example in [[../examples/xmobar.hs][examples/xmobar.hs]] showing you how to write a
- Haskell configuration that uses a new plugin, all in one file.
+ To use your new plugin, you need to use a pure Haskell configuration for
+ xmobar (as explained [[../readme.org#xmobar-in-haskell][here)]] and load your definitions in your =xmobar.hs=
+ file. You can see an example in [[../examples/xmobar.hs][examples/xmobar.hs]] showing you how to
+ write a Haskell configuration that uses a new plugin, all in one file.
- When xmobar runs with the full path to that Haskell file as its
- argument (or if you put it in =~/.config/xmobar/xmobar.hs=), and
- with the xmobar library installed (e.g., with =cabal install --lib
- xmobar=), the Haskell code will be compiled as needed, and the new
- executable spawned for you.
+ When xmobar runs with the full path to that Haskell file as its argument
+ (or if you put it in =~/.config/xmobar/xmobar.hs=), and with the xmobar
+ library installed (e.g., with =cabal install --lib xmobar=), the Haskell
+ code will be compiled as needed, and the new executable spawned for you.
That's it!