Allow running with no commands

lib/worm-scraper.js

@@ -16,7 +16,8 @@ const OUTPUT_DEFAULT = "(Book name).epub";
 
 const argv = yargs
   .usage(`${packageJson.description}\n\n${packageJson.name} [<command1> [<command2> [<command3> ...]]]\n\n` +
-         "Each command will fail if the previously-listed one has not yet been run (with matching options).")
+         "Each command will fail if the previously-listed one has not yet been run (with matching options).\n\n" +
+         "Running with no commands is equivalent to running download convert scaffold zip.")
   .command("download", "download all chapters into the cache")
   .command("convert", "convert the raw HTML into cleaned-up ebook chapters")
   .command("scaffold", "assemble the table of contents, etc.")
@@ -58,7 +59,6 @@ const argv = yargs
     requiresArg: true,
     global: true
   })
-  .demandCommand(1) // TODO remove and allow all
   .recommendCommands()
   .help()
   .version()
@@ -77,6 +77,10 @@ const chaptersPath = path.resolve(contentPath, "chapters");
 
 const commands = [];
 
+if (argv._.length === 0) {
+  argv._ = ["download", "convert", "scaffold", "zip"];
+}
+
 if (argv._.includes("download")) {
   const startURL = books[argv.book].startURL;
   commands.push(() => download(startURL, cachePath, manifestPath));