I'm not sure why you need to use a lambda then force it to memoize the return.
Why doesn't this work for you?
set(:user) {Capistrano::CLI.ui.ask("Your SSH User name : ")}
on first use it will ask; then return the same value every time it's used
thereafter
And on scoping global variables. That's method_missing at work not variable
scoping.
If you create a local variable of the same name as a capistrano config
variable, ruby will use that local variable. But if there is no local variable
of the same name ruby tries method_missing defined on the instance; and you are
in an instance of Capistrano::Configuration when defining tasks; which then
attempts to find a matching config variable and returns that if found. If not
ruby keeps walking up the class inheritance tree until it finally tries
Object#method_missing if that fails then you finally get a no method error
You can still get at a config value if you've defined a local variable of the
same name.
set :user, 'foo'
p user # => foo
begin
user = 'bar'
p user # => bar
p fetch(:user) # => foo
end
p user # => foo
On Nov 15, 2011, at 2:54 PM, Craig White <[email protected]> wrote:
> On Nov 15, 2011, at 1:42 PM, Craig White wrote:
>
>>
>> On Nov 15, 2011, at 10:56 AM, Lee Hambley wrote:
>>
>>> I meant, by "written long form" that it wasn't valid syntax… but it was
>>> supposed to be easier to understand:
>>>
>>> set(:branch, lambda { .... })
>>>
>>> is the required way...
>> ----
>> something about capistrano makes global variables local and makes me crazy...
>>
>> set(:user, lambda do
>> if $my_user == nil then
>> $my_user = Capistrano::CLI.ui.ask("Your SSH User name : ")
>> else
>> $my_user
>> end
>> end)
>>
>> and if any 'task' has multiple deploys or invoked before/after tasks that
>> call :user a second time, I am still asked for the user name a second time.
> ----
> same result as a one-liner too... ;-(
>
> set(:user, lambda { $my_user == nil ? $my_user = Capistrano::CLI.ui.ask("Your
> SSH User name : ") : $my_user } )
>
> Craig
>
> --
> * You received this message because you are subscribed to the Google Groups
> "Capistrano" group.
> * To post to this group, send email to [email protected]
> * To unsubscribe from this group, send email to
> [email protected] For more options, visit this group at
> http://groups.google.com/group/capistrano?hl=en
--
* You received this message because you are subscribed to the Google Groups
"Capistrano" group.
* To post to this group, send email to [email protected]
* To unsubscribe from this group, send email to
[email protected] For more options, visit this group at
http://groups.google.com/group/capistrano?hl=en
