initial cli api, some movement on tool selection

util/asciiArt.ts

@@ -0,0 +1,30 @@
+export async function getAsciiArt(art: string) {
+  const artFilePath = Deno.env.get("BEARMETAL_ASCII_PATH") ||
+    getBearmetalAsciiPath();
+  if (!artFilePath) return art;
+  let artFileText: string;
+  if (artFilePath.startsWith("http")) {
+    artFileText = await fetch(artFilePath).then((res) => res.text());
+  } else {
+    artFileText = await Deno.readTextFile(artFilePath);
+  }
+  const parserRX = /begin\s+(\w+)\s*\n([\s\S]*?)\s*end\s*/g;
+  let result = parserRX.exec(artFileText);
+
+  while (result !== null) {
+    const [_, name, artText] = result;
+    if (name === art) return artText;
+    result = parserRX.exec(artFileText);
+  }
+  return art;
+}
+
+function getBearmetalAsciiPath() {
+  const filenameRX = /asciiarts?\.txt$/;
+  for (const filename of Deno.readDirSync(".")) {
+    if (filename.isFile && filenameRX.test(filename.name)) {
+      return filename.name;
+    }
+  }
+  return null;
+}