Dr Nic

hash bang cucumber

I don’t know if this is a good idea or not, but often I just wish I could copy and paste a cucumber feature file into the command line and have it just run the frigging scenarios without having to prefix it with “cucumber”.

running scenarios directly from command line

Perhaps I’m a bit delirious but I think it would be fun to paste features/112_users_crud.feature into the console and it would run the scenarios:

$ features/users_crud.feature

instead of having to always do the extra key strokes:

$ cucumber features/users_crud.feature


Two steps:

  1. At the very top of each feature file add: #!/usr/bin/env cucumber
  2. Run chmod +x features/*.feature


Hash bang me up!

To apply this to all your feature files, jump into script/console or irb and run the following code within your project:

Dir["**/*.feature"].each do |feature|
  contents = File.read(feature)
  File.open(feature, "w") do |f|
    f << "#!/usr/bin/env cucumber\n\n"
    f << contents
  `chmod +x "#{feature}"`

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13 Responses to “hash bang cucumber”

  1. [...] This post was mentioned on Twitter by eladmeidar. eladmeidar said: 1. hash bang cucumber 2. … 3. profit! http://bit.ly/BwvzJ (via @drnic) [...]

  2. wuputah says:

    Alternatively or additionally, you could alias cucumber to ‘c’ or ‘cu’ in your shell environment.

  3. seems dangerous… how about an alias for cucumber? I have ‘cuke.’

  4. Dr Nic says:

    Danger is one of my middle names. Another middle name is “um, that looks unnecessary”.

    Yes, the ‘c’ alias might be better.

  5. Dr Nic says:

    No no no, I love pasting and hitting return. Oh I love it so.

  6. Joseph Wilk says:

    Very nifty!

    I’ve been using another approach (as I was keen to keep the feature files pure). I created a formatter which extends the pretty formatter but in the comment line it outputs:

    Scenario: We like cukes #c features/blah.feature:20

    Where c is aliased to cucumber.

  7. sr says:

    with zsh: alias -s feature=”cucumber”

  8. I did something similar using Fish Shell. I’ve whipped up a blog post explaining it for anyone who uses Fish. Instead of making each feature file executable, it does the equivalent of Ruby’s “method_missing” — if a command given to fish isn’t runnable it’ll call a special script (which you write) which can then decide what to do.

    Here’s the blog post: http://bjeanes.com/2009/10/07/using-fish-shells-event-system-to-behave-like-method-missing

  9. Aslak Hellesøy says:

    Very cooool :-)

  10. In Windows

    >assoc .feature=CucumberFile

    >ftype CucumberFile=C:\ruby\bin\cucumber.bat %1
    CucumberFile=C:\ruby\bin\cucumber.bat %1


  11. Pedro says:

    Alias are good but you still need to type features/foo.feature

    I used this function that I called cu in zsh

    cucumber features/$1.feature:$2

    in order to run the line 6 of the foo feature I just write

    cu foo 6

  12. Andrew Vit says:

    Pasting and hitting return? Drag & drop FTW!

    Nice tip. Simple. Love it.

  13. Chris Homer says:

    Maybe I’m missing something but it seems to me the easiest is to hit Command-R from textmate (if you have the cucumber bundle). I guess this requires you to be in the feature file though…