Support all package sources in "pub global activate"

[DartBot]

This issue was originally filed by @seaneagan

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Currently we have:

    pub global activate <package> [<version>]

which is limited to binaries from "hosted" packages. "path" and "git" packages are needed as well:

    https://www.dartlang.org/tools/pub/dependencies.html#dependency-sources

Seems like the most extensible way to do this would be to mimic how they are specified in pubspec.yaml:

    pub global activate <package> [<yaml snippet>]

Examples:

    pub global activate foo ">=1.0 <2.0"
    pub global activate foo "path: /path/to/foo"
    pub global activate foo "git: {url: 'git://...', ref: '...'}"

Suggesting yaml since there is no standard way to specify deep object literals via command line args. Alternatively just add dedicated args for each package source type:

    pub global activate foo --path /path/to/foo
    pub global activate foo --git.url git://... --git.ref ...
    pub global activate foo --version ">=1.0 <2.0"
    pub global activate foo --hosted.url http://... --hosted.name foo --version ">=1.0 <2.0"

Presumably the same command-line interface would be used for issue #18911.

[dgrove]

Removed Type-Defect label.
Added Type-Enhancement, Area-Pub, Triaged labels.

[munificent]

Set owner to @munificent.
Added Started label.

[munificent]

I'm thinking the syntax will look like:

$ pub global activate [--source <source>] <description> [constraint]

"--source" can be abbreviated to "-s". The constraint is only allowed on hosted packages (since git and path ones doesn't have multiple versions for a given description).

Examples:

    pub global activate foo -spath /path/to/foo
    pub global activate foo -sgit git://... ref...
    pub global activate foo ">=1.0 <2.0"
    pub global activate foo ">=1.0 <2.0" --server http://...

What do you think?

[nex3]

SGTM

[munificent]

Path sounds are supported by: https://codereview.chromium.org/428313004/

I'll add Git support in another patch.

To activate the current working directory, you can do:

$ pub global activate -spath .

[munificent]

This is done now. Path packages will be in 1.6. Git ones will be in the next dev release after that.

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Added Fixed label.

[DartBot]

This comment was originally written by @zoechi

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I already tried path packages successfully. Helps a lot when developing scripts!
pub run / pub global run is just great!

[sethladd]

\o/

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Added this to the 1.6 milestone.
Removed Priority-Unassigned label.
Added Priority-Medium label.

[DartBot]

This issue has been moved to dart-lang/pub#1044.