conky-config/main.lua

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--[[
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Boolean conventions:
0 is true, 1 is false
Module format:
LIBRARY STRUCTURE (a collection of functions/values in a table):
local M = {} -- define module-level table to return
local modname = requires 'modname'
-- import all required modules
local foo = function()
-- code
end
-- define more functions
M.foo = foo -- dump all functions into table
return M -- return entire table (use functions as modname.foo)
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Var names:
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- delimiters: all words separated by _ (unless camalCase)
- booleans: preceed by is_ (as in is_awesome)
- Spacial scope:
- Everything declared local by default
- reassigning to local:
- upval to local: prefix with _
- global to local: prefix with __
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- replace . with _ if callng from table
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- the only reason to do either of these is for performance, therefore
no need to localize variables that are only used during init
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- global: preceed with g_
- Temporal Scope
- init: only relevent to startup (nil'ed before first rendering loop)
- persistant: always relevent (potentially)
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- flank init vars with _
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- Mutability
- variable: lowercase
- constant: ALL_CAPS
- constants can be anything except functions
- Module Names:
- CapCamalCase
- var name is exactly the same as module name
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--]]
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--
-- initialialize global geometric data
--
local UPDATE_FREQUENCY = 1 --Hz
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_G_INIT_DATA_ = {
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UPDATE_INTERVAL = 1 / UPDATE_FREQUENCY,
LEFT_X = 32,
SECTION_WIDTH = 436,
CENTER_PAD = 20,
PANEL_HORZ_SPACING = 10,
PANEL_MARGIN_X = 20,
PANEL_MARGIN_Y = 10,
TOP_Y = 21,
SIDE_HEIGHT = 1020,
CENTER_HEIGHT = 220,
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-- silly hack, the price of a litewait language
ABS_PATH = debug.getinfo(1).source:match("@?(.*/)")
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}
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_G_INIT_DATA_.CENTER_LEFT_X = _G_INIT_DATA_.LEFT_X +
_G_INIT_DATA_.SECTION_WIDTH + _G_INIT_DATA_.PANEL_MARGIN_X * 2 +
_G_INIT_DATA_.PANEL_HORZ_SPACING
_G_INIT_DATA_.CENTER_RIGHT_X = _G_INIT_DATA_.CENTER_LEFT_X +
_G_INIT_DATA_.SECTION_WIDTH + _G_INIT_DATA_.CENTER_PAD
_G_INIT_DATA_.CENTER_WIDTH = _G_INIT_DATA_.SECTION_WIDTH * 2 +
_G_INIT_DATA_.CENTER_PAD
_G_INIT_DATA_.RIGHT_X = _G_INIT_DATA_.CENTER_LEFT_X +
_G_INIT_DATA_.CENTER_WIDTH + _G_INIT_DATA_.PANEL_MARGIN_X * 2 +
_G_INIT_DATA_.PANEL_HORZ_SPACING
conky_set_update_interval(_G_INIT_DATA_.UPDATE_INTERVAL)
--
-- init cairo
--
require 'cairo'
local __cairo_xlib_surface_create = cairo_xlib_surface_create
local __cairo_set_source_surface = cairo_set_source_surface
local __cairo_image_surface_create = cairo_image_surface_create
local __cairo_paint = cairo_paint
local __cairo_create = cairo_create
local __cairo_surface_destroy = cairo_surface_destroy
local __cairo_destroy = cairo_destroy
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--
-- import all packages and init with global geometric data
--
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package.path = _G_INIT_DATA_.ABS_PATH..'/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/drawing/?.lua;'..
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_G_INIT_DATA_.ABS_PATH..'/schema/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/func/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/super/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/arc/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/text/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/plot/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/rect/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/poly/?.lua;'..
_G_INIT_DATA_.ABS_PATH..'/core/widget/image/?.lua;'
_G_Widget_ = require 'Widget'
_G_Patterns_ = require 'Patterns'
local Util = require 'Util'
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local Panel = require 'Panel'
local System = require 'System'
local Network = require 'Network'
local Processor = require 'Processor'
local FileSystem = require 'FileSystem'
local Pacman = require 'Pacman'
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local Power = require 'Power'
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local ReadWrite = require 'ReadWrite'
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local Graphics = require 'Graphics'
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local Memory = require 'Memory'
local _unrequire = function(m) package.loaded[m] = nil end
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_G_Widget_ = nil
_G_Patterns_ = nil
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_unrequire('Super')
_unrequire('Color')
_unrequire('Gradient')
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_unrequire('Widget')
_unrequire('Patterns')
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_unrequire = nil
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_G_INIT_DATA_ = nil
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--
-- initialize static surface
--
local cs_static = __cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1920, 1080)
local cr_static = __cairo_create(cs_static)
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Panel.draw_static(cr_static)
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System.draw_static(cr_static)
Graphics.draw_static(cr_static)
Processor.draw_static(cr_static)
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ReadWrite.draw_static(cr_static)
Network.draw_static(cr_static)
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Pacman.draw_static(cr_static)
FileSystem.draw_static(cr_static)
Power.draw_static(cr_static)
Memory.draw_static(cr_static)
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__cairo_destroy(cr_static)
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cr_static = nil
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--
-- create some useful functions
--
local using_ac = function()
return Util.read_file('/sys/class/power_supply/AC/online') == '1'
end
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local LASTLOG_CMD = 'tail -1 /var/log/pacman.log'
local current_last_log_entry = Util.execute_cmd(LASTLOG_CMD)
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local check_if_log_changed = function()
local new_last_log_entry = Util.execute_cmd(LASTLOG_CMD)
if new_last_log_entry == current_last_log_entry then return 1 end
current_last_log_entry = new_last_log_entry
return 0
end
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--
-- main loop
--
local updates = -2 -- this accounts for the first few spazzy iterations
local __collectgarbage = collectgarbage
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function conky_main()
local _cw = conky_window
if not _cw then return end
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local cs = __cairo_xlib_surface_create(_cw.display, _cw.drawable,
_cw.visual, 1920, 1080)
local cr = __cairo_create(cs)
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__cairo_set_source_surface(cr, cs_static, 0, 0)
__cairo_paint(cr)
updates = updates + 1
local t1 = updates % (UPDATE_FREQUENCY * 10)
local t2
local is_using_ac = using_ac()
if is_using_ac then
t2 = updates % (UPDATE_FREQUENCY * 60)
else
t2 = updates % (UPDATE_FREQUENCY * 300)
end
local log_is_changed = false
if t2 == 0 then log_is_changed = check_if_log_changed() end
System.draw_dynamic(cr, log_is_changed)
Graphics.draw_dynamic(cr)
Processor.draw_dynamic(cr)
ReadWrite.draw_dynamic(cr, UPDATE_FREQUENCY)
Network.draw_dynamic(cr, UPDATE_FREQUENCY)
Pacman.draw_dynamic(cr, log_is_changed)
FileSystem.draw_dynamic(cr, t1)
Power.draw_dynamic(cr, UPDATE_FREQUENCY, is_using_ac)
Memory.draw_dynamic(cr)
__cairo_surface_destroy(cs)
__cairo_destroy(cr)
__collectgarbage()
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end