conditioanlly create and explode war

[kdabir]

Currently every invocation of glide creates and exploded war in the same app dir. This is redundant. This is required only when dependencies have changed of the outputApp does not exists.

We can conditionally skip the execution of tasks.

war {
    setOnlyIf {
    }
}

[kdabir]

If nothing is changed in source code, up-to-date check saves the hassle. We can verify by checking for UP-TO-DATE.

....
:war UP-TO-DATE
:appengineExplodeApp UP-TO-DATE
...

However this may change when the glide's sync and appengineRun reuse the same directory as the content of directory might have been changed after the war was exploded. Which is fair.

Currently, if warDir config is set on appengine this can be skipped. we need some other tasks to assemble war contents in warDir.

Closing for now. If that turns out to be big deal, can reopen.