Conditional tasks

[antonmedv]

Q	A
Issue Type	Feature Request
Deployer Version	v5

Purpose: add prechecks for tasks and hooks.

before('some:task', 'other:task')->when(function() {
    // ...
});

task('some:task')->when(function() {
    // ...
});

When exactly should when's functions be executed?

[hstandaert]

Function should be executed right before task execution. When false is returned, nothing should be outputted in the console.

Code sample:

deploy.php

server('prod_1', 'domain.com')
// ...

server('prod_2', 'domain.com')
// ...
->set('extra_stuff', '...');

task('some:task')->when(function() {
    return has('extra_stuff')
});
after('other:task', 'some:task')

Console output

$ dep deploy prod_1
...
> Executing task other:task

$ dep deploy prod_2
...
> Executing task other:task
> Executing task some:task

IMO, Syntax should be as illustrated in the code sample above, because all the code for a task is found in one place then.

[antonmedv]

What will lead to a bit complicated executor model. Also What about debug mode?

➤ Executing task deploy:prepare
[beta] > echo $0
[beta] < ssh multiplexing initialization
...
• done on [beta]
✔ Ok [4s 954ms]
[beta] > **CHECK WHEN COND HERE?**
[beta] < true
➤ Executing task deploy:release
[beta] > cd ~/beta && (if [ -h release ]; then echo 'true'; fi)
[beta] < true
...

➤ Executing task deploy:prepare
[beta] > echo $0
[beta] < ssh multiplexing initialization
...
• done on [beta]
✔ Ok [4s 954ms]
[beta] > **CHECK WHEN COND HERE?**
[beta] < false
...

[antonmedv]

Done with invoke func.