Implement standard library glob function

[hdwalters]

Fixes #463.

[b1ek]

two things:

1. that function should be rewritten to be failful, since it can hit a permission error or something stupid like that
2. all std functions must be covered by a test

[hdwalters]

@b1ek wrote:

1. that function should be rewritten to be failful, since it can hit a permission error or something stupid like that

Made function failing. Note, this now fails if the glob matches nothing, and due to a quirk of the Amber compiler, if you assign the results of an unsafe glob("...") call to a local variable, that variable contains [""] not [] as one might expect. This does not prevent the unit tests from passing.

2. all std functions must be covered by a test

Added unit tests for "missing file", "no spaces" and "with spaces".

[Ph0enixKM]

@hdwalters These two tests failed on my end. I'm running this on MacBook

[hdwalters]

@hdwalters These two tests failed on my end. I'm running this on MacBook

That's weird. I had to replace the temporary directory with a hard-coded placeholder for the assertion:

echo replace_regex(file, "^.+\/", "[tmpdir]\/", true)

Note that the slashes are escaped because we're calling sed 's/.../.../' under the hood. This is addressed in a new issue #481.

I would have thought that sed would perform this replacement, as the directories under /var/folders should be matched by regex ^.+/.

[Ph0enixKM]

@hdwalters great! So we're waiting for #481. Right?

[hdwalters]

@hdwalters great! So we're waiting for #481. Right?

This PR does not depend on #481, though my fix for that issue modifies these unit tests. To be clear, these unit tests will pass or fail on your machine, whether or not we escape slash characters in the stdlib replace_regex function.

[Mte90]

I shared my opinion on #463 (comment) and I am against this solution because use eval