Built-in help subcommand does not work with aliased git-style commands

[MattTheNub]

Example

#!/usr/bin/env node

const program = require('commander');

program
  .version('0.0.1')
  .description('Fake package manager')
  .command('install [name]', 'install one or more packages').alias('i');

program.parse(process.argv);

When running the built-in help command on the alias (pm help i), this happens:

Expected Behavior

The alias gets resolved to install, and the information is read from pm-install

Actual Behavior

The command attempts to read pm-i and fails, as it does not exist.

[shadowspawn]

The npm help foo pattern has never been documented in the README (#892) and would appear to be buggy making me wonder how implemented it was.

With your sample program it appears to be working as expected for --help though, given I only created index.js:

$ node index.js install --help
error: index-install(1) does not exist, try --help
$ node index.js i --help
error: index-install(1) does not exist, try --help

[shadowspawn]

I came across the (simple) implementation code today and had another look at behaviour. Commander is blindly turning "help foo" into "foo --help", but reasonable it should work with alias.

Categorising this as a bug.

[shadowspawn]

This is fixed in the published pre-release of Commander v5.0.0 (#1163)

[shadowspawn]

Commander v5.0.0 has been released.

https://github.com/tj/commander.js/releases/tag/v5.0.0