[swift-build-dev] Support installing SwiftPM executables from remote repos

[Orta Therox]

Hey all,

I've been working on a SwiftPM executable (danger-swift
<https://github.com/danger/danger-swift>) which is a pretty small CLI tool.
I feel like it's a bunch of work to allow a user to get a copy of the app
running on their computer / CIs. My current app distributions options are:
Homebrew <https://brew.sh> and Marathon
<https://github.com/JohnSundell/Marathon> (which I added to homebrew) or a
custom cURL'd setup script. None are great, because it requires many build
steps and require custom installers.

In an eco-system like Node/Ruby I can do something like "npm install -g
danger" which uses the centralized index, or  "npm install -g
danger/danger-js" if I wanted to use a repo which would install CLI tools.
I'd like to see SwiftPM cover this part of the swift ecosystem, and
encourage building small CLI tools in swift.

So, as an example of behavior, running this new command: "swift install
danger/danger-swift" would:

- use the danger/danger-swift a shortcut for GitHub, and clone that repo
into a temporary folder
- parse the Package.swift
<https://github.com/danger/danger-swift/blob/master/Package.swift> then let
the user know they are going to install the CLI executable danger-swift
- run swift build in release mode
- install the executable into a folder in the users default path

This greatly reduces the friction to making more tools, and reduces the
number of dependencies for users to being the Xcode CLT which basically
everyone has out of the box.

I'm willing to take a stab at an implementation if this has approval of
Anders/Daniel.

-- 
[A.]       Orta Therox

w/ Artsy <http://artsy.net/>
CocoaPods <http://cocoapods.org/> / CocoaDocs <http://cocoadocs.org/>
@orta / orta.github.com
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