Automatically find workspaces of all local dependencies and watch them.

[Blei]

This watches the workspace roots of all dependencies which are local, plus the workspace root of the current project. This has no effect if --watch/-w is manually specified.

Fixes #117.

It's very possible I'm missing some nuances though! Maybe this breaks in certain constellations of where cargo is invoked? Please let me know if I'm missing something.

[passcod]

Closed/reopened to trigger the builds after I changed the base branch.

[passcod]

Okay, that's looking good, even if it's somewhat different from #117 (but probably covers the original usecase).

If you could add this behaviour to the readme/usage/manpage as needed, I'll merge and release this asap!

[Blei]

I've pushed a new version of my change. Changes since last time:

• I've added a flag to disable the new behaviour
• I've updated some help output
• I've updated the README file (by dumping cargo help output) and the man file.

You mention this change is not what was discussed in the feature request. What do you think is different? I'm happy to change the PR into a form you think is useful.

[passcod]

Yeah, actually, upon further reflection, this PR changes the current behaviour quite a bit.

Say we have the following structure:

projectA/
  Cargo.toml -- workspace manifest
  pkg1/Cargo.toml -- depends on pkg2
  pkg2/Cargo.toml
  pkg3/Cargo.toml

1. run cargo watch from projectA/:

   • Current behaviour (8.x): all of projectA/ is watched
   • This PR: all of projectA/ is watched
   • so far so good

2. run cargo watch from projectA/pkg1/:

   • Current behaviour (8.x): projectA/pkg1/ is watched
   • This PR: all of projectA/ is watched
   • Wanted in 117: both projectA/pkg1/ and projectA/pkg2/ are watched

Now consider this other structure:

projectB/
  Cargo.toml -- workspace manifest
  pkg1/Cargo.toml -- depends on pkg3
  pkg2/Cargo.toml

projectC/
  Cargo.toml -- workspace manifest
  pkg3/Cargo.toml
  pkg4/Cargo.toml

3. run cargo watch from projectB/:

   • Current behaviour (8.x): all of projectB/ is watched
   • This PR: all of projectB/ and all of projectC/ are watched
   • Wanted in 117: unclear, but probably:
     • all of projectB/
     • and projectC/pkg3/

4. run cargo watch from projectB/pkg1/:

   • Current behaviour (8.x): projectB/pkg1/ is watched
   • This PR: all of projectB/ and all of projectC/ are watched
   • Wanted in 117: both projectB/pkg1/ and projectC/pkg3/ are watched

5. run cargo watch from projectB/pkg2/:

   • Current behaviour (8.x): projectB/pkg2/ is watched
   • This PR: all of projectB/ and all of projectC/ are watched
   • Wanted in 117: as there's no dependencies, presumably just projectB/pkg2/ is watched

[Blei]

I see. I thought I'd simplify the logic a bit because watching only the workspace root is probably fine :) I'll write up a new version which is more precise in what it tracks.

[Blei]

I think the latest version should fit what you describe.

[Blei]

Fixed the compile error.

[passcod]

Sorry for the delay! The code looks good, I just want to check a few more things and I haven't gotten to it yet. Next few days at the latest :) I did check things and they did look good, but the merge didn't happen because I got busy at work and forgot.