Teardown commands

[gustavohenke]

Introduces a --teardown flag to pass commands that execute when every input command exits.

$ concurrently --teardown "echo bye" "echo hey"
[0] hey
[0] echo hey exited with code 0
--> Running teardown command "echo bye"
bye
--> Teardown command "echo bye" exited with code 0

As you can see, teardown commands have no prefixing.

The flag can also be specified multiple times:

$ concurrently --teardown "echo bye" --teardown "echo real bye" "echo hey"
[0] hey
[0] echo hey exited with code 0
--> Running teardown command "echo bye"
bye
--> Teardown command "echo bye" exited with code 0
--> Running teardown command "echo real bye"
real bye
--> Teardown command "echo real bye" exited with code 0

Teardown commands also don't affect concurrently's exit code (unless it fails to spawn):

$ concurrently --teardown "exit 1" "echo hey"
[0] hey
[0] echo hey exited with code 0
--> Running teardown command "exit 1"
--> Teardown command "exit 1" exited with code 1

$ echo $?
0

Closes #472

[coveralls]

coverage: 98.677% (-0.5%) from 99.208%
when pulling 2fb4ed1 on teardown
into aa338ac on main.

[FezVrasta]

Thanks for the feature! Can't wait to try it

[FezVrasta]

When can we expect a new release with this?

[gustavohenke]

Hey! I had been working on a few other breaking changes - just shipped it as a major version.
Check out the release notes: https://github.com/open-cli-tools/concurrently/releases/tag/v9.0.0

[FezVrasta]

Thanks!