`den` prints usage twice

[zoechi]

I just tried den and found it weird that den without arguments produces this output:

 (master) $ den

den.dart: error: Must specify a sub-command.

Description:

  A pubspec authoring tool

Usage:

  den.dart [options] <command> [<args>]

Options:

  -h, --help    Print this usage information.

Commands:

  install       Add or modify dependencies          
  uninstall     Remove dependencies                 
  fetch         Show any outdated dependencies      
  pull          Update any outdated dependencies    
  completion    Tab completion for this command.    

  See 'den.dart help [command]' for more information about a command.

/home/myuser/.pub-cache/bin/den: 12: /home/myuser/.pub-cache/bin/den: [[: not found

den.dart: error: Must specify a sub-command.

Description:

  A pubspec authoring tool

Usage:

  den.dart [options] <command> [<args>]

Options:

  -h, --help    Print this usage information.

Commands:

  install       Add or modify dependencies          
  uninstall     Remove dependencies                 
  fetch         Show any outdated dependencies      
  pull          Update any outdated dependencies    
  completion    Tab completion for this command.    

  See 'den.dart help [command]' for more information about a command.

The first half is nicely colorized the second (starting from Description) monochrome.

[zoechi]

Executing den fetch produces

 (master) $ den fetch

Dependencies are up to date.
/home/myuser/.pub-cache/bin/den: 12: /home/myuser/.pub-cache/bin/den: [[: not found

Dependencies are up to date.

[zoechi]

den -h produces the same output as in my first comment.

[seaneagan]

@zoechi Thanks for the report! I can't reproduce on Ubuntu or Windows. Are you on a Mac? I don't have access to a Mac to try. What are the contents of your /home/myuser/.pub-cache/bin/den?

[zoechi]

Linux hostname.domain.local 3.16.0-4-amd64 #1 SMP Debian 3.16.7-2 (2014-11-06) x86_64 GNU/Linux  
Dart VM version: 1.9.0-edge.42259 (Wed Dec 10 10:45:21 2014) on "linux_x64"

#!/usr/bin/env sh
# This file was created by pub v1.9.0-edge.42279.
# Package: den
# Version: 0.1.2
# Executable: den
# Script: den
dart "/home/myuser/.pub-cache/global_packages/den/bin/den.dart.snapshot" "$@"

# The VM exits with code 255 if the snapshot version is out-of-date.
# If it is, we need to delete it and run "pub global" manually.
exit_code=$?
if [[ $exit_code != 255 ]]; then
  exit $exit_code
fi

pub global run den:den "$@"

[zoechi]

Looks like http://stackoverflow.com/questions/12230690/string-comparison-in-bash-not-found so it seems to be on my side.

[zoechi]

This seems to be the culprit http://stackoverflow.com/a/17753098/217408 (/bin/sh -> dash) and dash seems not to support [[ according to the SO answer.
Do you consider changing the first line in /home/myuser/.pub-cache/bin/den to #!/bin/bash, which fixes the issue for me?
I have no idea why dash is my default shell. I didn't do anything, I swear ;-)

[zoechi]

[[ is bash specific and according to this article the script file should set #!/bin/bash explicitly in this case. Contains some other interesting background I wasn't aware of.

[seaneagan]

Nice work! pub global activate generates those "binstubs", so I filed a bug for that:

http://dartbug.com/21854

[zoechi]

Oh, forgot that. Thanks for looking into it and forwarding the report.