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|
--
-- statusbar_external.lua
--
local settings = {
-- a simple example which shows utc time and date
-- in %udate every second with 'date -u'
{
template_key = 'udate',
external_program = 'date -u',
execute_delay = 1 * 1000,
},
-- a more complicated example showing the usage
-- percentage of hda1 every 30 seconds in %hda1u
-- with df, grep and sed.
{
template_key = 'hda1u',
external_program =
'df|grep hda1|sed "s/.*\\(..%\\).*/\\1/"',
execute_delay = 30 * 1000,
meter_length = 4,
hint_regexp = {
important = '9[456].',
critical = {
'9[789].',
'1...',
},
},
},
}
--
-- -- What is this?
--
-- This is a simple "general" statusbar lua script which
-- lets you show output of external programs in ion
-- statusbar. This is convenient if you are not familiar
-- with lua but can handle yourself with some other
-- language enough to output what you would want the
-- statusbar to show.
--
--
-- -- How to use it?
--
-- Short version:
--
-- 1 ) modify settings variable
-- 2 ) update template to include specified keys
-- 3 ) dopath( "statusbar_external" ) in cfg_user.lua
--
--
-- Longer version:
--
-- There is an example settings-variable which can be
-- modified to specify your own programs. The needed
-- parameters are the following :
--
-- * template_key
-- An unique name for the meter. You must add this
-- name with preceding % (for example %meter_name)
-- into your statusbar template which is usually set
-- in cfg_statusbar.lua.
--
-- * external_program
-- The program to execute. The last line of each
-- flushed output this program writes to stdout is
-- inserted as the content of the meter.
--
-- * execute_delay
-- The delay to wait before running the program again
-- once it stops sending data. Some programs just
-- send the data and exit while others continue
-- sending data periodically. This value can be used
-- to control the update rate for the first type of
-- programs.
--
-- * meter_length (optional)
-- The space reserved for this meter in characters.
-- If the value is not specified or is less than 1
-- then the space is determined by the length of the
-- data being shown but some people do not want their
-- statusbar width to change randomly.
--
-- * hint_regexp (poptional)
-- These regular expressions (in Lua syntax) are
-- matched with the data and in case of a match the
-- named hint is set to the meter. The value can be
-- either a string containing the regexp or a table
-- containing several possible regexps (Lua regexp
-- doesn't have an 'or'). By default the themes define
-- a color for 'important' and 'critical' hints.
--
-- After this script is loaded it starts executing all
-- the provided programs and updates the statusbar every
-- time one of them prints (and flushes) something.
--
-- Also this is not a normal statusd script so it
-- doesn't get loaded by template name automatically
-- when ion starts. You must add
--
-- dopath( "statusbar_external" )
--
-- to some script that is being loaded in Ion. For
-- example ~/.ion3/cfg_user.lua is a good place. Note
-- that cfg_statusbar.lua is not loaded inside the
-- Ion process but in a separate process and thus this
-- script can not be loaded from that file!
--
--
---------------------------------------------------------
local timers = {}
local inform_key, start_execute;
start_execute = function ( key )
ioncore.popen_bgread(
settings[key].external_program,
function ( data ) inform_key( key, data ) end
)
end
inform_key = function ( key, data )
if not data then
timers[key]:set(
settings[key].execute_delay,
function () start_execute( key ) end
)
else
-- remove all but the last line
data = string.gsub( data, "\n$", "" )
data = string.gsub( data, ".*\n", "" );
local sets = settings[key]
local t_key = sets.template_key
local t_length = sets.meter_length
local h_regexp = sets.hint_regexp
if not tlength or t_length < 1 then
t_length = string.len( data )
end
mod_statusbar.inform( t_key, data )
mod_statusbar.inform( t_key .. "_hint", '' )
mod_statusbar.inform(
t_key .. "_template",
string.rep( ' ', t_length )
)
if not h_regexp then h_regexp = {} end
for hint, re in pairs( h_regexp ) do
if ( type( re ) == 'string' ) then
re = { re }
end
for _, r in ipairs( re ) do
if ( string.find( data, r ) ) then
mod_statusbar.inform(
t_key .. "_hint", hint
)
end
end
end
mod_statusbar.update()
end
end
-- Start all
for key in pairs(settings) do
timers[key] = ioncore.create_timer()
start_execute( key )
end
--
-- Copyright (c) Antti Vhkotamki 2005.
--
-- Ion is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License as published by
-- the Free Software Foundation; either version 2.1 of the License, or
-- (at your option) any later version.
--
|
