contrib/statusd/statusd_uname.lua

   1 -- Authors: tyranix <tyranix@gmail.com>
   2 -- License: Public domain
   3 -- Last Changed: Unknown
   4 --
   5 -- statusd_uname.lua
   6 --[[
   7 Example of how to use statusd.popen_bgread() with coroutines to avoid blocking
   8 while reading I/O.
   9
  10 This only has one key to keep it simple: %uname_a
  11
  12 Normal Usage:
  13
  14 1) If you do not have ~/.ion3/cfg_statusbar.lua, copy that file from Ion3 to
  15    your ~/.ion3 directory.  On Debian, it is in /etc/X11/ion3/cfg_statusbar.lua.
  16
  17 2) Ion3 will load the appropriate modules if they are in the template at
  18    startup.
  19
  20    So place '%uname_a' into the template in ~/.ion3/cfg_statusbar.lua.
  21
  22
  23 Also, if you want to test this independent of ion, you can do this:
  24
  25 1) Copy statusd_uname.lua to ~/.ion3/
  26
  27 2) Run '/usr/lib/ion3/ion-statusd -m uname'
  28    This will dump out all of the updates to the terminal as they happen
  29
  30 3) Hit control+c when you are done testing.
  31
  32
  33 License: Public domain
  34
  35 tyranix [ tyranix at gmail ]
  36
  37 --]]
  38
  39 local defaults={
  40     -- Update every minute
  41     update_interval=60*1000,
  42 }
  43
  44 local uname_timer = nil
  45 local settings=table.join(statusd.get_config("uname"), defaults)
  46
  47 -- Parse the output and then tell statusd when we have all of the value.
  48 function parse_uname(partial_data)
  49     -- Keep reading partial_data until it returns nil
  50     local result = ""
  51     while partial_data do
  52         result = result .. partial_data
  53         -- statusd.popen_bgread() will resume us when it has more data
  54         partial_data = coroutine.yield()
  55     end
  56
  57     -- If we have a new result, tell statusd
  58     if result and result ~= "" then
  59         statusd.inform("uname_a", result)
  60     end
  61
  62     -- Setup the next execution.
  63     uname_timer:set(settings.update_interval, update_uname)
  64 end
  65
  66 -- If we get any stderr, just print it out.
  67 local function flush_stderr(partial_data)
  68     -- Continually grab stderr
  69     local result = ""
  70     while partial_data do
  71         result = result .. partial_data
  72         partial_data = coroutine.yield()
  73     end
  74
  75     if result and result ~= "" then
  76         print("STDERR:", result, "\n")
  77     end
  78 end
  79
  80 -- Query mocp to get information for statusd.
  81 function update_uname()
  82     statusd.popen_bgread('uname -a',
  83                          coroutine.wrap(parse_uname),
  84                          coroutine.wrap(flush_stderr))
  85 end
  86
  87 -- Timer so we can keep telling statusd what the current value is.
  88 uname_timer = statusd.create_timer()
  89 update_uname()
  90
  91 -- vim:tw=0: