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#!/usr/bin/env node
/* eslint no-console: off */

import fs from 'fs';
import path from 'path';
import { load } from '../src/opentype';

// Print out information about the font on the console.
function printFontInfo(font) {
    console.log('  glyphs:', font.glyphs.length);
    console.log('  kerning pairs (kern table):', Object.keys(font.kerningPairs).length);
    console.log('  kerning pairs (GPOS table):', (font.getGposKerningValue) ? 'yes' : 'no');
}

// Recursively walk a directory and execute the function for every file.
function walk(dir, fn) {
    var files, i, file;
    files = fs.readdirSync(dir);
    for (i = 0; i < files.length; i += 1) {
        file = files[i];
        var fullName = path.join(dir, file);
        var stat = fs.statSync(fullName);
        if (stat.isFile()) {
            fn(fullName);
        } else if (stat.isDirectory()) {
            walk(fullName, fn);
        }
    }
}

// Print out usage information.
function printUsage() {
    console.log('Usage: ot command [dir|file]');
    console.log();
    console.log('Commands:');
    console.log();
    console.log('  info    Get information of specified font or fonts in the specified directory.');
    console.log();
}

function fileInfo(file) {
    load(file, function(err, font) {
        console.log(path.basename(file));
        if (err) {
            console.log('  (Error: ' + err + ')');
        } else if (!font.supported) {
            console.log('  (Unsupported)');
        } else {
            printFontInfo(font);
        }
    });
}

function recursiveInfo(fontDirectory) {
    walk(fontDirectory, function(file) {
        var ext = path.extname(file).toLowerCase();
        if (ext === '.ttf' || ext === '.otf') {
            fileInfo(file);
        }
    });
}

if (process.argv.length < 3) {
    printUsage();
} else {
    var command = process.argv[2];
    if (command === 'info') {
        var fontpath = process.argv.length === 3 ? '.' : process.argv[3];
        if (fs.existsSync(fontpath)) {
            var ext = path.extname(fontpath).toLowerCase();
            if (fs.statSync(fontpath).isDirectory()) {
                recursiveInfo(fontpath);
            } else if (ext === '.ttf' || ext === '.otf') {
                fileInfo(fontpath);
            } else {
                printUsage();
            }
        } else {
            console.log('Path not found');
        }
    } else {
        printUsage();
    }
}