Conky-lua problem

Question

I used this as a lua script guide for conky (semi-relvent)
error message I can't resolve with my current lua knowledge or though research/script reading.
Conky: llua_do_call: function conky_main execution failed: attempt to call a nil value
conky config
# Conky, a system monitor, based on torsmo
# Any original torsmo code is licensed under the BSD license
# All code written since the fork of torsmo is licensed under the GPL
# Please see COPYING for details
# Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
# Copyright (c) 2005-2010 Brenden Matthews, Philip Kovacs, et. al. (see AUTHORS)
# All rights reserved.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# - Conky settings - #
update_interval .5
total_run_times 0
net_avg_samples 1
cpu_avg_samples 1
imlib_cache_size 0
double_buffer yes
no_buffers yes
# - Text settings - #
use_xft yes
xftfont Ubuntu:size=9
override_utf8_locale yes
text_buffer_size 2048
# - Window specifications - #
own_window_class Conky
own_window yes
own_window_type override
own_window_transparent yes
own_window_hints undecorated,below,sticky,skip_taskbar,skip_pager
#own_window_argb_visual yes
#own_window_argb_value 100
alignment bottom_right
alignment tr
gap_x -2
gap_y 180
minimum_size 350 300
default_bar_size 100 8
draw_shades no
default_color efefef
default_shade_color 1d1d1d
background no
border_width 1
default_color white
default_outline_color white
default_shade_color white
draw_borders no
draw_graph_borders yes
draw_outline no
out_to_console no
out_to_stderr no
extra_newline no
own_window yes
own_window_class Conky
own_window_type desktop
stippled_borders 0
update_interval 1.0
uppercase no
use_spacer none
show_graph_scale no
show_graph_range no
lua_load ./conky_outline.lua
lua_draw_hook_post main
TEXT
$alignc CPU
#${scroll 16 $nodename - $sysname $kernel on $machine | }
#$hr
#${color grey}Uptime:$color $uptime
#${color grey}Frequency (in MHz):$color $freq
#${color grey}Frequency (in GHz):$color $freq_g
#${color grey}RAM Usage:$color $mem/$memmax - $memperc% ${membar 4}
#${color grey}Swap Usage:$color $swap/$swapmax - $swapperc% ${swapbar 4}
#${color grey}CPU Usage:$color ${cpu cpu0}% ${cpugauge 0}
#${color grey}Processes:$color $processes ${color grey}Running:$color $running_processes
#$hr
#${color grey}File systems:
# / $color${fs_used /}/${fs_size /} ${fs_bar 6 /}
#${color grey}Networking:
#Up:$color ${upspeed eth0} ${color grey} - Down:$color ${downspeed eth0}
#$hr
#${color grey}Name PID CPU% MEM%
#${color lightgrey} ${top name 1} ${top pid 1} ${top cpu 1} ${top mem 1}
#${color lightgrey} ${top name 2} ${top pid 2} ${top cpu 2} ${top mem 2}
#${color lightgrey} ${top name 3} ${top pid 3} ${top cpu 3} ${top mem 3}
#${color lightgrey} ${top name 4} ${top pid 4} ${top cpu 4} ${top mem 4}
the lua script giving the errors
--[[line_width=5
top_left_x=20
top_left_y=20
rec_width=50
rec_height=50
red=1
green=0
blue=0
alpha=1 ]]
--draw it
require 'cario'
line_width=5
top_left_x=20
top_left_y=20
rec_width=50
rec_height=50
red=1
green=0
blue=0
alpha=1
function conky_main()
if value == nil then value = 0 end
pct = value/pt['max']
if conky_window == nil then return end
--local updates = conky_parse('${updates}')
-- update_num = tonumber(updates)
--if updates_num>5 then
cs = cairo_xlib_surface_create(conky_window.display, conky_window.drawable, conky_window.visual, conky_window.width, conky_window.height)
cr = cairo_create(cs)
--local updates=tonumber(conky_parse('${updates}')
cairo_set_line_width (cr,line_width)
cairo_rectangle (cr,top_left_x,top_left_y,rec_width,rec_height)
cairo_set_source_rgba (cr,red,green,blue,alpha)
--end-- if updates>5
cairo_destroy(cr)
cairo_surface_destroy(cs)
cr=nil
end-- end main function
ra
backgroud for anybody that cares.
Ive been trying to learn enough about lua and conky enough to make my own lua script for conky for flexabilty reasons. I want to be able to draw the background with lua which is what im trying to do here as a proof of concept.

Answer 1

runny6play wrote:
I tried it. It had no effect. also I changed lua_draw_hook_post main to lua_draw_hook_post conky_main
and this is what i got. though i think its just annother error for the setting i just changed because its incorrect.
Conky: llua_load: /home/alec/conky_outline.lua:11: module 'cario' not found:
no field package.preload['cario']
no file './cario.lua'
no file '/usr/share/lua/5.1/cario.lua'
no file '/usr/share/lua/5.1/cario/init.lua'
no file '/usr/lib/lua/5.1/cario.lua'
no file '/usr/lib/lua/5.1/cario/init.lua'
no file '/usr/lib/conky/libcario.so'
no file './cario.so'
no file '/usr/lib/lua/5.1/cario.so'
no file '/usr/lib/lua/5.1/loadall.so'
Conky: desktop window (15d) is root window
Conky: window type - desktop
Conky: drawing to created window (0x1200001)
Conky: drawing to double buffer
Conky: llua_do_call: function conky_main execution failed: attempt to call a nil value
Conky: llua_do_call: function conky_main execution failed: attempt to call a nil value
Conky: llua_do_call: function conky_main execution failed: attempt to call a nil value
Conky: llua_do_call: function conky_main execution failed: attempt to call a nil value
Shouldn't that be "Cairo" and not "Cario"?