Expose cargo failures

[White-Oak]

cargo::call properly returns Some() (I still think it should be Result instead of Option) if cargo task has failed (exited with non-zero status).

[ebkalderon]

There is something of a spacing issue here on line 83. Not very important, but my OCD just kicked in. 😉

[ebkalderon]

I am considering using an if let statement in this case, since we are only using the contents of Ok but not Err. Tell me what you think of this:

let exec_result = command.stdout(Stdio::inherit())
                         .stderr(Stdio::inherit())
                         .output();

if let Ok(output) = exec_result {
    if output.status.success() {
        None
    } else {
        Some("Cargo exited with an error!")
    }
} else {
    Some("Could not launch Cargo!")
}

[ebkalderon]

@White-Oak Besides the two comments above, this looks pretty good. I'm going to build this on my local machine to try it out. Just fix the spacing on that one line, and it will be merge-ready.

[ebkalderon]

@White-Oak Besides the two comments above, this looks pretty good. I'm going to build this on my local machine to try it out. Just fix the spacing on that one line, and it will be merge-ready.

[ebkalderon]

Thanks for the changes, @White-Oak! This and pull request #14 together bring us almost ready to closing issue #13. Merged.

[ebkalderon]

Thanks for the changes, @White-Oak! This and pull request #14 together bring us almost ready to closing issue #13. Merged.