fix: error when no command specified

packages/ipfs/src/cli/index.js

@@ -21,7 +21,7 @@ module.exports = (command, ctxMiddleware) => {
             // if the error was caused by an unknown command, the use of `.parse(command)`
             // below causes printing help to fail: https://github.com/yargs/yargs/issues/1419#issuecomment-527234789
             // so pass the unadulterated parser in as `yargs` in order to print help successfully
-            if (msg.includes('Unknown argument')) {
+            if (msg.includes('Unknown argument') || msg.includes('Please specify a command')) {
               yargs = parser
             }
 

packages/ipfs/src/cli/parser.js

@@ -24,7 +24,7 @@ const parser = yargs
     default: false
   })
   .epilog(utils.ipfsPathHelp)
-  .demandCommand(1)
+  .demandCommand(1, 'Please specify a command')
   .showHelpOnFail(false)
   .commandDir('commands')
   .help()

packages/ipfs/test/cli/commands.js

@@ -11,4 +11,12 @@ describe('commands', () => {
     const out = await cli('commands')
     expect(out.split('\n')).to.have.length(commandCount)
   })
+
+  it('requires a command', async () => {
+    await expect(cli('')).to.eventually.be.rejectedWith(/Please specify a command/).and.have.property('code', 'ERR_YARGS')
+  })
+
+  it('requires a known command', async () => {
+    await expect(cli('derp')).to.eventually.be.rejectedWith(/Unknown argument: derp/).and.have.property('code', 'ERR_YARGS')
+  })
 })