wp-i18n-export.php

#!/usr/bin/env php
<?php
use PhpParser\Error;
use PhpParser\NodeDumper;
use PhpParser\ParserFactory;
use PhpParser\NodeTraverser;
use PhpParser\NodeVisitorAbstract;
use PhpParser\Node;
use PhpParser\Node\Scalar\String_;
use PhpParser\Node\Expr\FuncCall;

require __DIR__ . '/vendor/autoload.php';

if (count($argv) <= 2) {
    echo "Usage: wp-i18n-export <plugin-slug> <src-dir>\n";
    exit(0);
}

$plugin = trim($argv[1]);
$dir = trim($argv[2]);

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS | RecursiveIteratorIterator::LEAVES_ONLY));
$results = [];

$currentFile = '';
$parser = (new ParserFactory())->createForNewestSupportedVersion();
$traverser = new NodeTraverser();
$traverser->addVisitor(new class extends NodeVisitorAbstract {
    public function enterNode(Node $node)
    {
        global $results, $currentFile;

        if ($node instanceof FuncCall && in_array($node->name->name, ['esc_html_e', 'esc_html__', 'esc_attr_e', 'esc_attr__', '__', '_e'], true)) {
            // require at least two arguments for i18n function calls
            // sometimes we call this without a text domain to get a translation from WordPress Core
            if (count($node->args) < 2) {
                return;
            }

            /** @var String_ $string */
            $string = $node->args[0]->value;
            /** @var String_ $domain */
            $domain = $node->args[1]->value;

            $results[] = [$currentFile, $node->getStartLine(), $string->getAttribute('rawValue'), $domain->getAttribute('rawValue')];
        }
    }
});

foreach ($iterator as $file) {
    if (! $file->isFile() || str_starts_with($file->getPathname(), './vendor/') || str_starts_with($file->getPathname(), './node_modules/')|| $file->getExtension() !== 'php') {
        continue;
    }

    $currentFile = $file->getPathname();
    $fileContents = file_get_contents($file->getPathname());
    try {
        $ast = $parser->parse($fileContents);
    } catch (Error $error) {
        echo "Parse error in file {$file->getPathname()}: {$error->getMessage()}\n";
        exit(1);
    }
    $traverser->traverse($ast);
}

// generate output
echo "<?php \n\n";
echo "// i18n strings for $plugin\n";

foreach ($results as [$file, $line, $string, $domain]) {
    echo "\n";
    echo "// {$file}#{$line}\n";
    echo "__({$string}, {$domain});\n";
}