The negative of a symbolic font character (Solved)

[666philb]

I have a script that shows the moon phase on conky.
It runs at startup and prints the result as a font from 'font Symbola' (included in fossa) to a config file, this is then read by conky.

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curl wttr.in/London?format=%m > /root/.config/moonphasec

it all works well but i find the font the wrong way around.
the result is this

Screenshot(9).png (12.03 KiB) Viewed 1300 times

but the dark area is actually the moon phase and the white area is dark area.
is there someway to invert this ? i know it's easy from an image but this is a font.

this is the actual font

[JakeSFR]

Hmm, that's how this glyph (f0 9f 8c 92) actually looks like and I agree that somebody should be fired.
The other one is an emoji, rendered by the browser; they've "fixed" it, apparently.
I use Unifont instead of Symbola, btw.

Anyway, it's possible to "invert" them 8 codepoints: 0x1f311 (127761) - 0x1f318 (127768), because the first 4 are basically inversions of the last 4, so we just need to add 4 to any of them and wrap around, when necessary.
For example (with a help of https://stackoverflow.com/a/14416133):

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incr=4; xmin=127761; xmax=127769; printf "%b" \\U$(printf '%x\n' $(echo $(( ((($(printf "%d\n" "'$(curl wttr.in/London?format=%m 2>/dev/null)") + incr - xmin) % (xmax - xmin)) + (xmax - xmin)) % (xmax - xmin) + xmin ))))

wttr_moon.gif (30.89 KiB) Viewed 1277 times

EDIT: here's a nice Bash script I found to calculate and show the current moonphase:

Greetings!

[666philb]

thanks @JakeSFR for this magical voodoo scripting

that bash script is also very clever so no need to use wttr.in now

mooncorrect.png (14.63 KiB) Viewed 1232 times

[rockedge]

Fun little script! Suddenly thinking a little GUI to output a little image of the phase........

Screenshot_2022-03-09_06-59-56.png (276.63 KiB) Viewed 1193 times

[666philb]

for anyone interested this is my script in /root/Startup that writes the config file for conky to read. (@JakeSFRs new version that doesn't use wittr.in not implemented yet)

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#!/bin/sh
sleep 60
incr=4; xmin=127761; xmax=127769; printf "%b" \\U$(printf '%x\n' $(echo $(( ((($(printf "%d\n" "'$(curl wttr.in/London?format=%m 2>/dev/null)") + incr - xmin) % (xmax - xmin)) + (xmax - xmin)) % (xmax - xmin) + xmin )))) > /root/.config/moonphasec

edit: the none wittr.in version (put in /root/Startup)

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#!/bin/bash

moon=`moonphase(){
  local lp=2551443
  local now=$(date -u +"%s")
  local newmoon=592500
  local phase=$((($now - $newmoon) % $lp))
  local phase_number=$((((phase / 86400) + 1)*100000))

  # Multiply by 100000 so we can do integer comparison.  Go Bash!

  if   [ $phase_number -lt 184566 ];  then phase_icon="○"  # new
  elif [ $phase_number -lt 553699 ];  then phase_icon="❩"  # waxing crescent
  elif [ $phase_number -lt 922831 ];  then phase_icon="◗"  # first quarter
  elif [ $phase_number -lt 1291963 ];  then phase_icon="◑"  # first quarter
  elif [ $phase_number -lt 1661096 ]; then phase_icon="●"  # full
  elif [ $phase_number -lt 2030228 ]; then phase_icon="◐"  # waning gibbous
  elif [ $phase_number -lt 2399361 ]; then phase_icon="◖"  # last quarter
  elif [ $phase_number -lt 2768493 ]; then phase_icon="❨"  # waning crescent
  else
    phase_icon="○"  # new
  fi
  echo $phase_icon

}

moonphase`

echo $moon > /root/.config/moonphasec

and to add it to conky

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${font Symbola:size=40}${exec cat /root/.config/moonphasec}${font Dejavu Sans Mono:size=12}