It's a skeleton of a program.

Soon it will have organs, but not yet...

gemtext-html.php

@@ -0,0 +1,42 @@
+#!/usr/bin/php
+<?php
+
+// BSD-style usage prompt
+function help() {
+	echo <<<HELP
+Usage: gemtext-html infile.gem [outfile.html]
+HELP;
+}
+
+// "no such file" is actually unhelpful and likely untrue, but this seems to be the standard *nix behaviour so 🤷
+function fileHandleingError(string $file) {
+	fwrite(STDERR, "$file: no such file");
+	exit(2);
+}
+
+// If there aren't exactly 2 or 3 arguments, politely tell the user they're a dolt
+if ($argc != 2 && $argc != 3) {
+	var_dump($argc);
+	help();
+	exit(1);
+}
+
+// Let's name our arguments some actually meaningful names
+$infilePath  = $argv[1];
+// If there are more than 2 args, use the second arg as our outfile path,
+// otherwise, make a .html file with the same name as the .gmi file
+if ($argc > 2){
+	$outfilePath = $argv[2];
+} else {
+	$outfilePath = basename($infilePath, '.gmi') . '.html';
+}
+
+// Finally actually opening the satandamned files
+$infile = fopen($infilePath, 'r') or fileHandleingError($infilePath);
+$outfile = fopen($outfilePath, 'w') or fileHandleingError($outfilePath);
+
+
+// Remember to close your files at the end of the script so the kernel doesn't do something stupid
+fclose($infile);
+fclose($outfile);
+?>