Conky how to display folder size with lua

[brianlopwe]

Hi,

How can I display folders size in Conky with a lua script like this:



Here is my lua script:

--[[ BARGRAPH WIDGET
    v2.1 by wlourf (07 Jan. 2011)
    this widget draws a bargraph with different effects 
    http://u-scripts.blogspot.com/2010/07/bargraph-widget.html
    
To call the script in a conky, use, before TEXT
    lua_load /path/to/the/script/bargraph.lua
    lua_draw_hook_pre main_rings
and add one line (blank or not) after TEXT

    
Parameters are :
3 parameters are mandatory
name    - the name of the conky variable to display, for example for {$cpu cpu0}, just write name="cpu"
arg        - the argument of the above variable, for example for {$cpu cpu0}, just write arg="cpu0"
          arg can be a numerical value if name=""
max        - the maximum value the above variable can reach, for example, for {$cpu cpu0}, just write max=100
    
Optional parameters:
x,y        - coordinates of the starting point of the bar, default = middle of the conky window
cap        - end of cap line, ossibles values are r,b,s (for round, butt, square), default="b"
          http://www.cairographics.org/samples/set_line_cap/
angle    - angle of rotation of the bar in degress, default = 0 (i.e. a vertical bar)
          set to 90 for an horizontal bar
skew_x    - skew bar around x axis, default = 0
skew_y    - skew bar around y axis, default = 0
blocks  - number of blocks to display for a bar (values >0) , default= 10
height    - height of a block, default=10 pixels
width    - width of a block, default=20 pixels
space    - space between 2 blocks, default=2 pixels
angle_bar    - this angle is used to draw a bar on a circular way (ok, this is no more a bar !) default=0
radius        - for cicular bars, internal radius, default=0
              with radius, parameter width has no more effect.

Colours below are defined into braces {colour in hexadecimal, alpha}
fg_colour    - colour of a block ON, default= {0x00FF00,1}
bg_colour    - colour of a block OFF, default = {0x00FF00,0.5}
alarm        - threshold, values after this threshold will use alarm_colour colour , default=max
alarm_colour - colour of a block greater than alarm, default=fg_colour
smooth        - (true or false), create a gradient from fg_colour to bg_colour, default=false 
mid_colour    - colours to add to gradient, with this syntax {position into the gradient (0 to1), colour hexa, alpha}
              for example, this table {{0.25,0xff0000,1},{0.5,0x00ff00,1},{0.75,0x0000ff,1}} will add
              3 colurs to gradient created by fg_colour and alarm_colour, default=no mid_colour
led_effect    - add LED effects to each block, default=no led_effect
              if smooth=true, led_effect is not used
              possibles values : "r","a","e" for radial, parallelel, perdendicular to the bar (just try!)
              led_effect has to be used with theses colours :
fg_led        - middle colour of a block ON, default = fg_colour
bg_led        - middle colour of a block OFF, default = bg_colour
alarm_led    - middle colour of a block > ALARM,  default = alarm_colour

reflection parameters, not avaimable for circular bars
reflection_alpha    - add a reflection effect (values from 0 to 1) default = 0 = no reflection
                      other values = starting opacity
reflection_scale    - scale of the reflection (default = 1 = height of text)
reflection_length   - length of reflection, define where the opacity will be set to zero
                      calues from 0 to 1, default =1
reflection            - position of reflection, relative to a vertical bar, default="b"
                      possibles values are : "b","t","l","r" for bottom, top, left, right
draw_me     - if set to false, text is not drawn (default = true or 1)
              it can be used with a conky string, if the string returns 1, the text is drawn :
              example : "${if_empty ${wireless_essid wlan0}}${else}1$endif",

v1.0 (10 Feb. 2010) original release
v1.1 (13 Feb. 2010) numeric values can be passed instead conky stats with parameters name="", arg = numeric_value    
v1.2 (28 Feb. 2010) just renamed the widget to bargraph
v1.3 (03 Mar. 2010) added parameters radius & angle_bar to draw the bar in a circular way
v2.0 (12 Jul. 2010) rewrite script + add reflection effects and parameters are now set into tables
v2.1 (07 Jan. 2011) Add draw_me parameter and correct memory leaks, thanks to "Creamy Goodness"

--      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 version 3 (GPLv3)
--     
--      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, write to the Free Software
--      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
--      MA 02110-1301, USA.        

]]

require 'cairo'

----------------START OF PARAMETERS ----------
function conky_main_bars()
    local bars_settings={
        {    --[ Graph for CPU1 ]--
            name="cpu",
            arg="cpu",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=165,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },
        {    --[ Graph for RAM ]--
            name="memperc",
            arg="memperc",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.0},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=271,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },
        {    --[ Graph for SWAP ]--
            name="swapperc",
            arg="swapperc",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=301,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },
--        {    --[ Graph for CPU2 ]--
--            name="cpub",
--            arg="cpu2",
--            max=100,
--            alarm=50,
--            alarm_colour={0xFF0000,0.72},
--            bg_colour={0xFFFFFF,0.25},
--            fg_colour={0x00FF00,0.55},
--            mid_colour={{0.45,0xFFFF00,0.70}},
--            x=70,y=32,
--            blocks=25,
--            space=1,
--            height=2,width=5,
--            angle=90,
--            smooth=true
--            },    
        {    --[ Graph for / ]--
            name="fs_used_perc",
            arg="/",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=738,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },          
--            {    --[ Graph for Downspeed ]--
--                        name="downspeedf",
--            arg="eth0",
--            max=500,
--            alarm=400,
--            alarm_colour={0xFF0000,0.72},
--            bg_colour={0xFFFFFF,0.25},
--            fg_colour={0x00FF00,0.55},
--            mid_colour={{0.45,0xFFFF00,0.70}},
--            x=200,y=13,
--            blocks=77,
--            space=1,
--            height=2,width=5,
--            angle=90,
--            smooth=true
--            },
         }        
    
-----------END OF PARAMETERS--------------


    
    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)
    
    cr = cairo_create(cs)    
    --prevent segmentation error when reading cpu state
    if tonumber(conky_parse('${updates}'))>3 then
        for i in pairs(bars_settings) do
            
            draw_multi_bar_graph(bars_settings[i])
            
        end
    end
    cairo_destroy(cr)
    cairo_surface_destroy(cs)
    cr=nil

end



function draw_multi_bar_graph(t)
    cairo_save(cr)
    --check values
    if t.draw_me == true then t.draw_me = nil end
    if t.draw_me ~= nil and conky_parse(tostring(t.draw_me)) ~= "1" then return end    
    if t.name==nil and t.arg==nil then 
        print ("No input values ... use parameters 'name' with 'arg' or only parameter 'arg' ") 
        return
    end
    if t.max==nil then
        print ("No maximum value defined, use 'max'")
        return
    end
    if t.name==nil then t.name="" end
    if t.arg==nil then t.arg="" end

    --set default values    
    if t.x == nil        then t.x = conky_window.width/2 end
    if t.y == nil        then t.y = conky_window.height/2 end
    if t.blocks == nil    then t.blocks=10 end
    if t.height == nil    then t.height=10 end
    if t.angle == nil     then t.angle=0 end
    t.angle = t.angle*math.pi/180
    --line cap style
    if t.cap==nil        then t.cap = "b" end
    local cap="b"
    for i,v in ipairs({"s","r","b"}) do 
        if v==t.cap then cap=v end
    end
    local delta=0
    if t.cap=="r" or t.cap=="s" then delta = t.height end
    if cap=="s" then     cap = CAIRO_LINE_CAP_SQUARE
    elseif cap=="r" then
        cap = CAIRO_LINE_CAP_ROUND
    elseif cap=="b" then
        cap = CAIRO_LINE_CAP_BUTT
    end
    --end line cap style
    --if t.led_effect == nil    then t.led_effect="r" end
    if t.width == nil    then t.width=20 end
    if t.space == nil    then t.space=2 end
    if t.radius == nil    then t.radius=0 end
    if t.angle_bar == nil    then t.angle_bar=0 end
    t.angle_bar = t.angle_bar*math.pi/360 --halt angle
    
    --colours
    if t.bg_colour == nil     then t.bg_colour = {0x00FF00,0.5} end
    if #t.bg_colour~=2         then t.bg_colour = {0x00FF00,0.5} end
    if t.fg_colour == nil     then t.fg_colour = {0x00FF00,1} end
    if #t.fg_colour~=2         then t.fg_colour = {0x00FF00,1} end
    if t.alarm_colour == nil     then t.alarm_colour = t.fg_colour end
    if #t.alarm_colour~=2         then t.alarm_colour = t.fg_colour end

    if t.mid_colour ~= nil then    
        for i=1, #t.mid_colour do    
            if #t.mid_colour[i]~=3 then 
                print ("error in mid_color table")
                t.mid_colour[i]={1,0xFFFFFF,1} 
            end
        end
    end
    
    if t.bg_led ~= nil and #t.bg_led~=2    then t.bg_led = t.bg_colour end
    if t.fg_led ~= nil and #t.fg_led~=2    then t.fg_led = t.fg_colour end
    if t.alarm_led~= nil and #t.alarm_led~=2 then t.alarm_led = t.fg_led end
    
    if t.led_effect~=nil then
        if t.bg_led == nil then t.bg_led = t.bg_colour end
        if t.fg_led == nil     then t.fg_led = t.fg_colour end
        if t.alarm_led == nil  then t.alarm_led = t.fg_led end
    end
    

    if t.alarm==nil then t.alarm = t.max end --0.8*t.max end
    if t.smooth == nil then t.smooth = false end

    if t.skew_x == nil then 
        t.skew_x=0 
    else
        t.skew_x = math.pi*t.skew_x/180    
    end
    if t.skew_y == nil then 
        t.skew_y=0
    else
        t.skew_y = math.pi*t.skew_y/180    
    end
    
    if t.reflection_alpha==nil then t.reflection_alpha=0 end
    if t.reflection_length==nil then t.reflection_length=1 end
    if t.reflection_scale==nil then t.reflection_scale=1 end
    
    --end of default values
    

     local function rgb_to_r_g_b(col_a)
        return ((col_a[1] / 0x10000) % 0x100) / 255., ((col_a[1] / 0x100) % 0x100) / 255., (col_a[1] % 0x100) / 255., col_a[2]
    end
    
    
    --functions used to create patterns

    local function create_smooth_linear_gradient(x0,y0,x1,y1)
        local pat = cairo_pattern_create_linear (x0,y0,x1,y1)
        cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(t.fg_colour))
        cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(t.alarm_colour))
        if t.mid_colour ~=nil then
            for i=1, #t.mid_colour do
                cairo_pattern_add_color_stop_rgba (pat, t.mid_colour[i][1], rgb_to_r_g_b({t.mid_colour[i][2],t.mid_colour[i][3]}))
            end
        end
        return pat
    end

    local function create_smooth_radial_gradient(x0,y0,r0,x1,y1,r1)
        local pat =  cairo_pattern_create_radial (x0,y0,r0,x1,y1,r1)
        cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(t.fg_colour))
        cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(t.alarm_colour))
        if t.mid_colour ~=nil then
            for i=1, #t.mid_colour do
                cairo_pattern_add_color_stop_rgba (pat, t.mid_colour[i][1], rgb_to_r_g_b({t.mid_colour[i][2],t.mid_colour[i][3]}))
            end
        end
        return pat
    end
    
    local function create_led_linear_gradient(x0,y0,x1,y1,col_alp,col_led)
        local pat = cairo_pattern_create_linear (x0,y0,x1,y1) ---delta, 0,delta+ t.width,0)
        cairo_pattern_add_color_stop_rgba (pat, 0.0, rgb_to_r_g_b(col_alp))
        cairo_pattern_add_color_stop_rgba (pat, 0.5, rgb_to_r_g_b(col_led))
        cairo_pattern_add_color_stop_rgba (pat, 1.0, rgb_to_r_g_b(col_alp))
        return pat
    end

    local function create_led_radial_gradient(x0,y0,r0,x1,y1,r1,col_alp,col_led,mode)
        local pat = cairo_pattern_create_radial (x0,y0,r0,x1,y1,r1)
        if mode==3 then
            cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(col_alp))                
            cairo_pattern_add_color_stop_rgba (pat, 0.5, rgb_to_r_g_b(col_led))
            cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(col_alp))                
        else
            cairo_pattern_add_color_stop_rgba (pat, 0, rgb_to_r_g_b(col_led))
            cairo_pattern_add_color_stop_rgba (pat, 1, rgb_to_r_g_b(col_alp))                
        end
        return pat
    end






    local function draw_single_bar()
        --this fucntion is used for bars with a single block (blocks=1) but 
        --the drawing is cut in 3 blocks : value/alarm/background
        --not zvzimzblr for circular bar
        local function create_pattern(col_alp,col_led,bg)
            local pat
            
            if not t.smooth then
                if t.led_effect=="e" then
                    pat = create_led_linear_gradient (-delta, 0,delta+ t.width,0,col_alp,col_led)
                elseif t.led_effect=="a" then
                    pat = create_led_linear_gradient (t.width/2, 0,t.width/2,-t.height,col_alp,col_led)
                elseif  t.led_effect=="r" then
                    pat = create_led_radial_gradient (t.width/2, -t.height/2, 0, t.width/2,-t.height/2,t.height/1.5,col_alp,col_led,2)
                else
                    pat = cairo_pattern_create_rgba  (rgb_to_r_g_b(col_alp))
                end
            else
                if bg then
                    pat = cairo_pattern_create_rgba  (rgb_to_r_g_b(t.bg_colour))
                else
                    pat = create_smooth_linear_gradient(t.width/2, 0, t.width/2,-t.height)
                end
            end
            return pat
        end
        
        local y1=-t.height*pct/100
        local y2,y3
        if pct>(100*t.alarm/t.max) then 
            y1 = -t.height*t.alarm/100
            y2 = -t.height*pct/100
            if t.smooth then y1=y2 end
        end
        
        if t.angle_bar==0 then
        
            --block for fg value
            local pat = create_pattern(t.fg_colour,t.fg_led,false)
            cairo_set_source(cr,pat)
            cairo_rectangle(cr,0,0,t.width,y1)
            cairo_fill(cr)
            cairo_pattern_destroy(pat)
        
            -- block for alarm value            
            if not t.smooth and y2 ~=nil then 
                pat = create_pattern(t.alarm_colour,t.alarm_led,false)
                cairo_set_source(cr,pat)
                cairo_rectangle(cr,0,y1,t.width,y2-y1)
                cairo_fill(cr)
                y3=y2
                cairo_pattern_destroy(pat)
            else
                y2,y3=y1,y1
            end
            -- block for bg value
            cairo_rectangle(cr,0,y2,t.width,-t.height-y3)
            pat = create_pattern(t.bg_colour,t.bg_led,true)
            cairo_set_source(cr,pat)
            cairo_pattern_destroy(pat)
            cairo_fill(cr)
        end        
    end  --end single bar
    





    local function draw_multi_bar()
        --function used for bars with 2 or more blocks
        for pt = 1,t.blocks do 
            --set block y
            local y1 = -(pt-1)*(t.height+t.space)
            local light_on=false
            
            --set colors
            local col_alp = t.bg_colour
            local col_led = t.bg_led
            if pct>=(100/t.blocks) or pct>0 then --ligth on or not the block
                if pct>=(pcb*(pt-1))  then 
                    light_on = true
                    col_alp = t.fg_colour
                    col_led = t.fg_led
                    if pct>=(100*t.alarm/t.max) and (pcb*pt)>(100*t.alarm/t.max) then 
                        col_alp = t.alarm_colour 
                        col_led = t.alarm_led 
                    end
                end
            end

            --set colors
            --have to try to create gradients outside the loop ?
            local pat 
            
            if not t.smooth then
                if t.angle_bar==0 then
                    if t.led_effect=="e" then
                        pat = create_led_linear_gradient (-delta, 0,delta+ t.width,0,col_alp,col_led)
                    elseif t.led_effect=="a" then
                        pat = create_led_linear_gradient (t.width/2, -t.height/2+y1,t.width/2,0+t.height/2+y1,col_alp,col_led)                    
                    elseif  t.led_effect=="r" then
                        pat = create_led_radial_gradient (t.width/2, y1, 0, t.width/2,y1,t.width/1.5,col_alp,col_led,2)    
                    else
                        pat = cairo_pattern_create_rgba  (rgb_to_r_g_b(col_alp))
                    end
                else
                     if t.led_effect=="a"  then
                         pat = create_led_radial_gradient (0, 0, t.radius+(t.height+t.space)*(pt-1),
                                                         0, 0, t.radius+(t.height+t.space)*(pt),                         
                                             col_alp,col_led,3)    
                    else
                        pat = cairo_pattern_create_rgba  (rgb_to_r_g_b(col_alp))                    
                    end
                    
                end
            else
                
                if light_on then
                    if t.angle_bar==0 then
                        pat = create_smooth_linear_gradient(t.width/2, t.height/2, t.width/2,-(t.blocks-0.5)*(t.height+t.space))
                    else
                        pat = create_smooth_radial_gradient(0, 0, (t.height+t.space),  0,0,(t.blocks+1)*(t.height+t.space),2)
                    end
                else        
                    pat = cairo_pattern_create_rgba  (rgb_to_r_g_b(t.bg_colour))
                end
            end
            cairo_set_source (cr, pat)
            cairo_pattern_destroy(pat)

            --draw a block
            if t.angle_bar==0 then
                cairo_move_to(cr,0,y1)
                cairo_line_to(cr,t.width,y1)
            else        
                cairo_arc( cr,0,0,
                    t.radius+(t.height+t.space)*(pt)-t.height/2,
                     -t.angle_bar -math.pi/2 ,
                     t.angle_bar -math.pi/2)
            end
            cairo_stroke(cr)
        end    
    end
    
    
    
    
    local function setup_bar_graph()
        --function used to retrieve the value to display and to set the cairo structure
        if t.blocks ~=1 then t.y=t.y-t.height/2 end
        
        local value = 0
        if t.name ~="" then
            value = tonumber(conky_parse(string.format('${%s %s}', t.name, t.arg)))
            --$to_bytes doesn't work when value has a decimal point,
            --https://garage.maemo.org/plugins/ggit/browse.php/?p=monky;a=commitdiff;h=174c256c81a027a2ea406f5f37dc036fac0a524b;hp=d75e2db5ed3fc788fb8514121f67316ac3e5f29f
            --http://sourceforge.net/tracker/index.php?func=detail&aid=3000865&group_id=143975&atid=757310
            --conky bug?
            --value = (conky_parse(string.format('${%s %s}', t.name, t.arg)))
            --if string.match(value,"%w") then
            --    value = conky_parse(string.format('${to_bytes %s}',value))
            --end
        else
            value = tonumber(t.arg)
        end

        if value==nil then value =0 end
        
        pct = 100*value/t.max
        pcb = 100/t.blocks
        
        cairo_set_line_width (cr, t.height)
        cairo_set_line_cap  (cr, cap)
        cairo_translate(cr,t.x,t.y)
        cairo_rotate(cr,t.angle)

        local matrix0 = cairo_matrix_t:create()
        tolua.takeownership(matrix0)
        cairo_matrix_init (matrix0, 1,t.skew_y,t.skew_x,1,0,0)
        cairo_transform(cr,matrix0)

    
        
        --call the drawing function for blocks
        if t.blocks==1 and t.angle_bar==0 then
            draw_single_bar()
            if t.reflection=="t" or t.reflection=="b" then cairo_translate(cr,0,-t.height) end
        else
            draw_multi_bar()
        end

        --dot for reminder
        --[[
        if t.blocks ~=1 then
            cairo_set_source_rgba(cr,1,0,0,1)
            cairo_arc(cr,0,t.height/2,3,0,2*math.pi)
            cairo_fill(cr)
        else
            cairo_set_source_rgba(cr,1,0,0,1)
            cairo_arc(cr,0,0,3,0,2*math.pi)
            cairo_fill(cr)
        end]]
        
        --call the drawing function for reflection and prepare the mask used        
        if t.reflection_alpha>0 and t.angle_bar==0 then
            local pat2
            local matrix1 = cairo_matrix_t:create()
            tolua.takeownership(matrix1)
            if t.angle_bar==0 then
                pts={-delta/2,(t.height+t.space)/2,t.width+delta,-(t.height+t.space)*(t.blocks)}
                if t.reflection=="t" then
                    cairo_matrix_init (matrix1,1,0,0,-t.reflection_scale,0,-(t.height+t.space)*(t.blocks-0.5)*2*(t.reflection_scale+1)/2)
                    pat2 = cairo_pattern_create_linear (t.width/2,-(t.height+t.space)*(t.blocks),t.width/2,(t.height+t.space)/2)
                elseif t.reflection=="r" then
                    cairo_matrix_init (matrix1,-t.reflection_scale,0,0,1,delta+2*t.width,0)
                    pat2 = cairo_pattern_create_linear (delta/2+t.width,0,-delta/2,0)
                elseif t.reflection=="l" then
                    cairo_matrix_init (matrix1,-t.reflection_scale,0,0,1,-delta,0)
                    pat2 = cairo_pattern_create_linear (-delta/2,0,delta/2+t.width,-0)
                else --bottom
                    cairo_matrix_init (matrix1,1,0,0,-1*t.reflection_scale,0,(t.height+t.space)*(t.reflection_scale+1)/2)
                    pat2 = cairo_pattern_create_linear (t.width/2,(t.height+t.space)/2,t.width/2,-(t.height+t.space)*(t.blocks))
                end
            end
            cairo_transform(cr,matrix1)

            if t.blocks==1 and t.angle_bar==0 then
                draw_single_bar()
                cairo_translate(cr,0,-t.height/2) 
            else
                draw_multi_bar()
            end
            
            
            cairo_set_line_width(cr,0.01)
            cairo_pattern_add_color_stop_rgba (pat2, 0,0,0,0,1-t.reflection_alpha)
            cairo_pattern_add_color_stop_rgba (pat2, t.reflection_length,0,0,0,1)
            if t.angle_bar==0 then
                cairo_rectangle(cr,pts[1],pts[2],pts[3],pts[4])
            end
            cairo_clip_preserve(cr)
            cairo_set_operator(cr,CAIRO_OPERATOR_CLEAR)
            cairo_stroke(cr)
            cairo_mask(cr,pat2)
            cairo_pattern_destroy(pat2)
            cairo_set_operator(cr,CAIRO_OPERATOR_OVER)
            
        end --reflection
        pct,pcb=nil
    end --setup_bar_graph()
    
    --start here !
    setup_bar_graph()
    cairo_restore(cr)
end

[again?]

It's all there in the lua section "--[ Graph for / ]--"
Just check the x=16,y=738, line.
At the moment the the graph is being positioned 16px from the left and 738px from the top of your conky window
You probably need to reduce the y=738 value to bring it into view.

eg TEXT section of conky.

TEXT
/File Systems:
/${alignr 10}${fs_used /} / ${fs_size /}

lua section "--[ Graph for / ]--"

        {    --[ Graph for / ]--
            name="fs_used_perc",
            arg="/",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=55,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },

To show short units, add in the conky section above TEXT

short_units yes

[brianlopwe]

I meant, how to display folders size like I did with /.
Putting /usr or /etc does not work and still show me / size since it is mounted on the same disk.
I know there is

du -sh

but it is heavy on the CPU and should not be running every seconds.

[again?]

The conky execi command runs a command at an interval to reduce cpu use.
eg ${execi 1800 du -sh ~ 2>/dev/null | awk '{print $1}'} will run du every half hour.
Will out put something like 18G.

To draw a bar graph of home as a percentage of / used space with the the lua script,
is more difficult because the script requires a conky variable.
You can use a line in conky to write the size of home in bytes to a file. (fist line in conky example}

Then, in the lua file, you can use the conky variable "head" to read the file.
In the lua file you need to also change the "max=" to the used space of / in bytes
so as to draw ~ as a percentage of /.
eg to get / size

glen@Bionic:~$ du -s / 2>/dev/null
114369452

example conky and lua

TEXT
${execi 1800 du -s ~ 2>/dev/null | awk '{print $1}' > ~/homesize.txt}
/File Systems:
/${alignr 10}${fs_used /} / ${fs_size /}
${voffset 45}Home${alignr 10}${execi 1800 du -sh ~ 2>/dev/null | awk '{print $1}'}

In the lua I added a section for "Graph for ~"

        {    --[ Graph for / ]--
            name="fs_used_perc",
            arg="/",
            max=100,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=65,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },
        {    --[ Graph for ~ ]--
            name="head", 
            arg="~/homesize.txt 1",
            max=114369452,
            alarm=50,
            alarm_colour={0xd56002,2.00},
            bg_colour={0x000000,2.00},
            fg_colour={0xd56002,2.00},
            mid_colour={{0.45,0xd56002,2.00}},
            x=16,y=125,
            blocks=45,
            space=-1,
            height=6.02,width=6,
            angle=90,
            smooth=true
            },

[brianlopwe]

ok so if I want let's say /usr folder size, is

${execi 1800 du -s ~ 2>/dev/null | awk '{print $1}' > ~/usrsize.txt}

correct ?

[again?]

~ is a shortcut for $HOME

glen@Bionic:~$ echo ~
/home/glen
glen@Bionic:~$ echo $HOME
/home/glen

For /usr you would use ( 2>/dev/null redirects error messages ) (awk '{print $1}' prints the first field)

${execi 1800 du -s /usr 2>/dev/null | awk '{print $1}' > ~/usrsize.txt}

The conky variable execi runs shell commands so you can test in terminal...just drop the conky bits and the output file...

du -s /usr 2>/dev/null | awk '{print $1}'

The output file can be named whatever and wherever you like.
Just have to use that same file path in the lua "arg=" line followed by a 1.
The 1 tells head howmany lines to read.
eg

            name="head", 
            arg="~/usrsize.txt 1",

[brianlopwe]

crap now that I've removed my encryption folder I can't get conky to write a size .txt in ~. It show that in the terminal when I run conky: $head can't find information about /home/otherideas/usrsize.txt
I tried to add the .txt manually and it still doesnt work.

Edit: ok so I've added the .txt by terminal and I can start conky now but it show the size of /usr as (null).
Edit2: well, I don't know what happened but it does show /usr size now..I think it may be because I wrote

du -s /usr 2>/dev/null | awk '{print $1}'

in the terminal, not sure..
Edit3: It show me 2.7G instead of the 2.4G I see when I click on properties on /usr folder.

[again?]

You can write to /tmp/usrsize.txt which may be better.

Run without error redirection.

du -sh /usr

du is not somthing I use.
Try different options
eg

du -sh --apparent-size /usr

See..

man du

Why file size diffs ---> https://unix.stackexchange.com/quest...perties-inside

[brianlopwe]

yes, it works so thank you for your help.