[Backward incompatible change] This changes the formatting of "error info" -- a feature introduced in v6.0.0. There are two changes:

1. Error info is now always rendered via JSON.stringify. Previously that was only done if showErrStack. This deals with an issue where the other rendering would result in, e.g., res: [object Object] if the info value was an Object.
2. Indentation has been increased.

Before v7.0.0 example:

$ mytool list
mytool list: error: 3 errors:
    error gathering rebalancer-agent info on storage inst 70521b69-4c31-469b-b120-00d7e2300517
    error gathering rebalancer-agent info on storage inst 887bb8e7-5117-4173-a9a3-6499ab10651c
    error gathering rebalancer-agent info on storage inst 20e480c9-fb66-4a64-8d92-c2f89e496da1
    res: [object Object]

With v7.0.0 example:

$ mytool list
mytool list: error: 3 errors:
    error gathering rebalancer-agent info on storage inst 20e480c9-fb66-4a64-8d92-c2f89e496da1
    error gathering rebalancer-agent info on storage inst 887bb8e7-5117-4173-a9a3-6499ab10651c
    error gathering rebalancer-agent info on storage inst 70521b69-4c31-469b-b120-00d7e2300517
    error info:
        {
            "res": {
                "uuid": "cc9ad6da-e05e-11e2-8e23-002590c3f078",
                "hostname": "S12612523509075",
                "zonename": "20e480c9-fb66-4a64-8d92-c2f89e496da1",
                "service": "storage",
                "result": {
                    "exit_status": 2,
                    "stdout": "edfeb9c7-1c22-41ca-ab17-b8c3bfdf8037\nnot-frobbed\n",
                    "stderr": "bash: line 33: syntax error: unexpected end of file\n"
                }
            }
        }

[Backward incompatible change] Drop support for cmdln.main() accepting a non-Error instance from a <Cmdln>.main(). Before this change a subcommand calling back with something like callback(true) would "work". Now it will throw:

  AssertionError [ERR_ASSERTION]: err from main is not an Error: true

[Backward incompatible change] Drop the undocumented cli.suppressShowErr option.

[Backward incompatible change] Add showErrInfo option to cmdln.main(). "Error info" is additional info on an error instance in the callback from the run command, per https://github.com/joyent/node-verror#verrorinfoerr.

For example, you could have code like this in a subcommand handler:

  var err = new VError(
      {
          name: 'NotEnoughSpaceError'
          info: {'x-request-id': response.headers['x-request-id']
      },
      'not enough free space for 5120 MB'
  );
  err.code = 'NotEnoughSpace';
  cb(err);

Here that info: ... object is the "error info". That would look like the following on the command-line:

  mbucket cp: error (NotEnoughSpace): not enough free space for 5120 MB
      x-request-id: 5f41a396-e800-4d64-8b01-11e65fe74aa5

This is a backward incompatible change if you already have subcommands that can return a VError instance with info. To get the old behaviour, use:

  cmdln.main(cli, {showErrInfo: false});

Note that before this change, error info was already being shown in the output when showErrStack was true.

[issue #19] Add strings config option to Cmdln creation that allows overriding the strings used in some generated output -- in particular the help output headers. E.g., one can use:

function CLI() {
    Cmdln.call(this, {
        // ...
        strings: {
            helpHeaderUsage: 'USAGE',
            helpHeaderOptions: 'OPTIONS',
            helpHeaderCommands: 'COMMANDS'
        }

To have the CLI help output use "USAGE" rather than "Usage:", etc.

See https://github.com/trentm/node-cmdln/blob/master/test/cmd/help-header-style.js for a complete example.

[Backward incompatible change, issue #12] Cmdln's dispatch to do_* subcommand handler functions is no longer wrapped in a try/catch block, which means that exceptions from programmer errors will no longer be swallowed. Before this change a programmer error could not be distinguished from a command calling back with a runtime error.

Take this example:

var util = require('util');
var cmdln = require('.');

function CLI() {
    cmdln.Cmdln.call(this, {name: 'boom'});
}
util.inherits(CLI, cmdln.Cmdln);

CLI.prototype.do_hi = function (subcmd, opts, args, cb) {
    someMissingHelperFunction(); // OOPS
    cb();
};

if (require.main === module) {
    cmdln.main(new CLI());
}

Before cmdln v5:

$ node boom.js hi
boom: error: someMissingHelperFunction is not defined
$ echo $?
1

And as of this change:

$ node boom.js hi
/Users/trentm/tm/node-cmdln/boom.js:10
    someMissingHelperFunction();
    ^

ReferenceError: someMissingHelperFunction is not defined
    at CLI.do_hi (/Users/trentm/tm/node-cmdln/boom.js:10:5)
    at CLI.dispatch (/Users/trentm/tm/node-cmdln/lib/cmdln.js:1315:17)
    at mainInit (/Users/trentm/tm/node-cmdln/lib/cmdln.js:727:14)
    at CLI.init (/Users/trentm/tm/node-cmdln/lib/cmdln.js:965:5)
    at CLI.cmdlnMain [as main] (/Users/trentm/tm/node-cmdln/lib/cmdln.js:702:10)
    at Object.main (/Users/trentm/tm/node-cmdln/lib/cmdln.js:1493:9)
    at Object.<anonymous> (/Users/trentm/tm/node-cmdln/boom.js:15:11)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
$ echo $?
1

Switch testing to node-tap (requires node v6 to run test suite).

Drop "support" for node 0.8.

Switch checking/formatting to eslint/prettier.

[#18] Improve printing of error details in cmdln.main(). Specifically:

• If the err is a verror.MultiError, then print all of collected errors' messages.
• With showErrStack use VError.fullStack() to print the full cause chain.
• With showErrStack print VError.info() if there is any.

See [issue #18] for examples.