Add ExecAt

[gabstv]

Execute commands on a different path than the working directory:

import ( "github.com/bitfield/script" ) func main(){ // proj version based on last git tag v, _ := script.ExecAt("/Users/me/some-project", "git describe --tags --dirty").String() println("some-project version: " + v) }

[bitfield]

Great PR, thanks!

It occurred to me looking at this that maybe this is a better API:

script.Echo("/Users/me/some-project").ExecAt("git describe --tags --dirty")

This way, you could run the same command on multiple directories at once, and those directories could come from a pipe, or from command-line arguments. What do you think?

[bitfield]

Can we have both Exec and ExecAt use the same basic machinery? It would be tiresome to have to fix a bug in multiple places, for example.

[bitfield]

We're really just testing Exec here, aren't we—this is a straight copy of TestExec, but with the working directory parameter added. Since we already know Exec works, from its own test, and since ExecAt should use Exec (see previous comment), this test only needs to test that the command runs in the specified working directory (and also to test the behaviour in various edge cases, such as 'directory doesn't exist', 'permission denied', and so on).

[bitfield]

Hey @gabstv—are you still interested in working on this? If not, that's fine, but would you mind if I picked up your PR and finished off the changes requested here?

[bitfield]

Closing as no response from OP.