Generates CSS for custom fonts on the Sony Reader PRS series, normalising the size of fonts using the inverse of the Asc+Desc metric

css-generate.php

#!/usr/bin/env php
<?php

// requirements: python, pip
// dependencies: font-line

// installation:
// sudo -H python -m ensurepip
// sudo -H pip install font-line

// setup:
// script should sit alongside folders full of font families

// usage:
// call this script without any parameters

$which = (count($argv) == 1) ? "*" : $argv[1];

$dirs = glob($which, GLOB_ONLYDIR);

foreach ($dirs as $folder) {
	echo "\n";
	echo "Folder:\t$folder\n";
	
	$files = glob("$folder/*");

	echo "Files:\t".count($files)."\n";
	
	$regular = @reset(preg_grep('/-Regular\.(ttf|otf)$/i', $files));
	$bold = @reset(preg_grep('/-(Bold|SemiBold)\.(ttf|otf)$/i', $files));
	 if (!$bold) $bold = $regular;
	$italic = @reset(preg_grep('/-Italic\.(ttf|otf)$/i', $files));
	$bolditalic = @reset(preg_grep('/-(BoldItalic|SemiBoldItalic)\.(ttf|otf)$/i', $files));
	 if (!$bolditalic) $bolditalic = $italic;

	$familyname = $folder;
	
	echo "Ratio:\t";
	$ratio = system("bc -l <<< \"scale=2;$(font-line report ".str_replace(' ', '\ ', $folder)."/* | grep --text 'hhea Asc + Desc' | grep -o -E '[0-9\.]+' | paste -s -d+ - | bc)/4\"");
	$resize = round(1 / $ratio, 2);

	echo "\n";

	// begin formatted CSS
	$css = <<<CSS
@page {
margin-bottom: 0.5em;
margin-left: 0.5em;
margin-right: 0.5em;
margin-top: 1em;
}

@font-face {
font-family: "$familyname";
font-weight: normal;
font-style: normal;
src: url(res:///Data/fonts/$regular);
}

@font-face {
font-family: "$familyname";
font-weight: bold;
font-style: normal;
src: url(res:///Data/fonts/$bold);
}

@font-face {
font-family: "$familyname";
font-weight: normal;
font-style: italic;
src: url(res:///Data/fonts/$italic);
}

@font-face {
font-family: "$familyname";
font-weight: bold;
font-style: italic;
src: url(res:///Data/fonts/$bolditalic);
}

body {
font-family: "$familyname";
font-size: {$resize}em;
}
CSS;
	// end formatted CSS

	file_put_contents("../database/system/PRSPlus/epub/$familyname.css", $css);
}

echo "Total:\t".count($dirs)."\n\n";

?>