#!/bin/bash

# Based on:
# https://github.com/sdothum/dotfiles/tree/main/bin/bin/functions/font

font_loc=./dist/Iosevka/TTF/

pushd .
cd $font_loc

regular=$(ls -1 | grep -Ev 'italic|oblique|extended')
italic=$(ls -1 | grep -E  'italic')

basefont() { echo $1 | grep -q '[-]italic.ttf' && echo "${1%italic*}regular.ttf" || echo "${1%italic*}.ttf"; }

# some defaults
ANGLE=${ANGLE:--9}     # iosevka italic angle (verify with fontforge).. see font/iosevka
XSHIFT=${XSHIFT:--40}  # italic descending capital left side bearing shift

extended=576          # extended regular shape (slightly tighter than Iosevka defaults)
expanded=600          # maximum terminal source code and proof legibility
shape=$expanded

# flit t in a regular font and shift to the left of cell
for f in $regular ;do
    echo "Flipping t in $f"
    echo "
Open(\$1);
Select(0u0074);
HFlip();
Move($XSHIFT,0);  # tweak side bearing towards left
SetWidth($shape);
Generate(\$1);
" | fontforge --quiet --lang=ff --script - $f
done

# italicize flipped from regular glyph and shift to left of cell
 for f in $italic ;do
     echo "Flipping t in $f"
     echo echo "
Open(\$2);
Select(0u0074);
Italic($ANGLE);
Copy();
Open(\$1);
Select(0u0074);
Paste();
Move($XSHIFT,0);  # adjust for italic side bearing shift towards left
SetWidth($shape);
Generate(\$1);
" | fontforge --quiet --lang=ff --script - $i $(basefont $i)
 done

# return to the initial directory and exit
popd