dotfiles/arch/conky/conkyrings.lua

--[[
Ring Meters by londonali1010 (2009)

This script draws percentage meters as rings. It is fully customisable; all options are described in the script.

IMPORTANT: if you are using the 'cpu' function, it will cause a segmentation fault if it tries to draw a ring straight away. The if statement on line 145 uses a delay to make sure that this doesn't happen. It calculates the length of the delay by the number of updates since Conky started. Generally, a value of 5s is long enough, so if you update Conky every 1s, use update_num > 5 in that if statement (the default). If you only update Conky every 2s, you should change it to update_num > 3; conversely if you update Conky every 0.5s, you should use update_num > 10. ALSO, if you change your Conky, is it best to use "killall conky; conky" to update it, otherwise the update_num will not be reset and you will get an error.

Changelog:
+ v1.2.1 -- Fixed minor bug that caused script to crash if conky_parse() returns a nil value (20.10.2009)
+ v1.2 -- Added option for the ending angle of the rings (07.10.2009)
+ v1.1 -- Added options for the starting angle of the rings, and added the "max" variable, to allow for variables that output a numerical value rather than a percentage (29.09.2009)
+ v1.0 -- Original release (28.09.2009)
]]

conky_background_color = 0x151515
conky_background_alpha = 0

ring_background_color = 0x424242
ring_background_alpha = 0.9
ring_foreground_color = 0xefefef
ring_foreground_color2 = 0x1994d1
ring_foreground_color3 = 0x0FC4E3
ring_foreground_alpha = 1

settings_table = {
    {
        name='time',
        arg='%S',
        max=60,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=100, y=100,
        radius=40,
        thickness=12,
        start_angle=0,
        end_angle=360,
        fill_l_to_r=false
    },
    {
        name='time',
        arg='%I.%M',
        max=12,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color,
        fg_alpha=ring_foreground_alpha,
        x=100, y=100,
        radius=50,
        thickness=5,
        start_angle=-140,
        end_angle=-30,
        fill_l_to_r=false
    },
    {
        name='time',
        arg='%M.%S',
        max=60,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=100, y=100,
        radius=50,
        thickness=5,
        start_angle=30,
        end_angle=140,
        fill_l_to_r=false
    },
    {
        name='cpu',
        arg='cpu0',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color,
        fg_alpha=ring_foreground_alpha,
        x=50, y=225,
        radius=26,
        thickness=5,
        start_angle=-180,
        end_angle=90,
        fill_l_to_r=false
    },
    {
        name='cpu',
        arg='cpu1',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=50, y=225,
        radius=20,
        thickness=5,
        start_angle=-180,
        end_angle=90,
        fill_l_to_r=false
    },
    {
        name='memperc',
        arg='',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color,
        fg_alpha=ring_foreground_alpha,
        x=150, y=225,
        radius=26,
        thickness=5,
        start_angle=-90,
        end_angle=180,
        fill_l_to_r=true
    },
    {
        name='swapperc',
        arg='',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=150, y=225,
        radius=20,
        thickness=5,
        start_angle=-90,
        end_angle=180,
        fill_l_to_r=true
    },
    --[[
    {
        name='mpd_vol',
        arg='',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color3,
        fg_alpha=ring_foreground_alpha,
        x=750, y=100,
        radius=20,
        thickness=5,
        start_angle=-90,
        end_angle=180,
        fill_l_to_r=false
    },
    {
        name='if_match "${mpd_status}"=="Playing"}${mpd_percent}${else}${if_match "${mpd_status}"=="Paused"}${mpd_percent}${else}0${endif}${endif',
        --name='mpd_percent',
        arg='',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=750, y=100,
        radius=26,
        thickness=5,
        start_angle=-90,
        end_angle=180,
        fill_l_to_r=false
    },
    --]]
    {
        name='upspeedf',
        arg='wlp3s0',
        max=750,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=50, y=320,
        radius=20,
        thickness=5,
        start_angle=-270,
        end_angle=0,
        fill_l_to_r=true
    },
    {
        name='downspeedf',
        arg='wlp3s0',
        max=4000,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color,
        fg_alpha=ring_foreground_alpha,
        x=50, y=320,
        radius=26,
        thickness=5,
        start_angle=-270,
        end_angle=0,
        fill_l_to_r=true
    },
    {
        name='fs_used_perc',
        arg='/home',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color,
        fg_alpha=ring_foreground_alpha,
        x=150, y=320,
        radius=26,
        thickness=5,
        start_angle=0,
        end_angle=270,
        fill_l_to_r=false
    },
    {
        name='fs_used_perc',
        arg='/',
        max=100,
        bg_colour=ring_background_color,
        bg_alpha=ring_background_alpha,
        fg_colour=ring_foreground_color2,
        fg_alpha=ring_foreground_alpha,
        x=150, y=320,
        radius=20,
        thickness=5,
        start_angle=0,
        end_angle=270,
        fill_l_to_r=false
    },
}

require 'cairo'

function rgb_to_r_g_b(colour,alpha)
    return ((colour / 0x10000) % 0x100) / 255., ((colour / 0x100) % 0x100) / 255., (colour % 0x100) / 255., alpha
end

function draw_ring(cr,t,pt)
    local w,h=conky_window.width,conky_window.height

    local xc,yc,ring_r,ring_w,sa,ea,lr=pt['x'],pt['y'],pt['radius'],pt['thickness'],pt['start_angle'],pt['end_angle'],pt['fill_l_to_r']
    local bgc, bga, fgc, fga=pt['bg_colour'], pt['bg_alpha'], pt['fg_colour'], pt['fg_alpha']

    local angle_0=sa*(2*math.pi/360)-math.pi/2
    local angle_f=ea*(2*math.pi/360)-math.pi/2
    local t_arc=t*(angle_f-angle_0)
    if math.abs(t_arc) > t*math.abs(angle_f-angle_0) then
      t_arc = t*angle_f
    end

    if lr then
      -- Draw background ring
      cairo_arc(cr,xc,yc,ring_r,angle_0,angle_f)
      cairo_set_source_rgba(cr,rgb_to_r_g_b(bgc,bga))
      cairo_set_line_width(cr,ring_w)
      cairo_stroke(cr)

      -- Draw indicator ring
      cairo_arc(cr,xc,yc,ring_r,angle_f-t_arc,angle_f)
      cairo_set_source_rgba(cr,rgb_to_r_g_b(fgc,fga))
      cairo_stroke(cr)
    else
      -- Draw background ring
      cairo_arc(cr,xc,yc,ring_r,angle_0,angle_f)
      cairo_set_source_rgba(cr,rgb_to_r_g_b(bgc,bga))
      cairo_set_line_width(cr,ring_w)
      cairo_stroke(cr)

      -- Draw indicator ring
      cairo_arc(cr,xc,yc,ring_r,angle_0,angle_0+t_arc)
      cairo_set_source_rgba(cr,rgb_to_r_g_b(fgc,fga))
      cairo_stroke(cr)
    end
end

function conky_ring_stats()
    local function setup_rings(cr,pt)
        local str=''
        local value=0

        str=string.format('${%s %s}',pt['name'],pt['arg'])
        str=conky_parse(str)

        value=tonumber(str)
        if value == nil then value = 0 end
        pct=value/pt['max']

        draw_ring(cr,pct,pt)
    end

    if conky_window==nil then return end
    local cs=cairo_xlib_surface_create(conky_window.display,conky_window.drawable,conky_window.visual, conky_window.width,conky_window.height)

    local cr=cairo_create(cs)

    local updates=conky_parse('${updates}')
    update_num=tonumber(updates)

    if update_num>5 then
        for i in pairs(settings_table) do
            setup_rings(cr,settings_table[i])
        end
    end
end