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My goal is to build a simple custom guard with Guard. The gem install and bundler install for my app went fine. My Guardfile contains:
notification :growl
guard 'eyeball' do
watch %r{^app/(.*)}
watch %r{^config/(.*)}
watch %r{^lib/(.*)}
end
Ok, next, I need to tell Guard what to do when a match happens. But I don't know where to do that. (In this case, I want to watch my application for changes and run some arbitrary code. Assume that there isn't a guard available for what I want. I want to learn how to do it myself.)
In true 'blunder and see what errors pop up next' style, when I run guard I get this error message:
ERROR: Could not load 'guard/eyeball' or find class Guard::Eyeball ERROR: cannot load such file -- guard/eyeball ERROR: Invalid Guardfile, original error is: undefined method `new' for nil:NilClass ERROR: No guards found in Guardfile, please add at least one. Guard uses Growl to send notifications. Guard is now watching at '/Users/my-user-name/dev/my-project-name'
So, that gives me a hint that I need to create a guard/eyeball.rb file. Maybe? But how was I supposed to know this from the documentation?
I've read (several times) the very detailed and useful Guard README but haven't found a good simple example that shows someone how to do 'just the basics' of writing your own guard. Unexpectedly, RailsCasts didn't really answer my question either: see RailsCast #264 Guard.
Did I overlook something in the Guard README? Can you help or point to a good example? Thanks!
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Syntax of guard Statement The syntax of the guard statement is: guard expression else { // statements // control statement: return, break, continue or throw. } Note: We must use return , break , continue or throw to exit from the guard scope.
You use a guard statement to require that a condition must be true in order for the code after the guard statement to be executed. Unlike an if statement, a guard statement always has an else clause—the code inside the else clause is executed if the condition is not true.
Honest and Trustworthy You need to be able to trust your guard with your belongings and business. An honest security guard will make it easier for you to trust them. There will be times when they will have to work alone, and you can't keep an eye on them.
Sweet! I just found a Wiki page on the Guard wiki titled Create a guard that answers my questions. It was not mentioned in the README, so I had to dig for it.
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