initial cli api, some movement on tool selection

cli/argParser.ts

@@ -0,0 +1,33 @@
+export class ArgParser {
+  private args: string[];
+
+  constructor(args: string[]) {
+    this.args = args;
+  }
+
+  public get(key: string) {
+    const index = this.args.indexOf(key);
+    if (index === -1) return null;
+    return this.args[index + 1];
+  }
+
+  get flags() {
+    return this.args.filter((arg) => arg.startsWith("-"));
+  }
+
+  get nonFlags() {
+    return this.args.filter((arg) => !arg.startsWith("-"));
+  }
+
+  get namedArgs() {
+    return this.args.filter((arg) => arg.startsWith("--"));
+  }
+
+  get task() {
+    return this.nonFlags[0];
+  }
+
+  static parse(args: string[]) {
+    return new ArgParser(args);
+  }
+}