Fix GrepDateTest

[adamjtaylor]

Amends GrepDateTest to

• Negate the exit code such that a match returns exit 1 (test fails) and no match returns exit 0 (test passes)
• Removes -w option so that terms such as <AcquisitionDate> where the risk term is not a isolated word now match
• Adds -a option to explicitly treat binary files as text
• Adds -q option to suppress output as is not needed by the test

Note that for TIFF files this only searches within values of Tags where the content is a string, such as ImageDescription
We may wish to add an additional test that searches the DateTime tag itself.

[adamjtaylor]

FYI @thomasyu888 - looks like I can't explicitly assign you as a reviewer.

[adamjtaylor]

Tests failing as this is a branch on my fork.
@thomasyu888 could I have my permissions in this repo elevated so that I can create branches in the repo and assign reviewers.

[adamjtaylor]

As this test is now part of the TiffSuite, I am tempted to extend it here to grep within the output of tifftools dump

eg
! tifftools dump image.tiff | grep -Eiaq 'date|time'

This would allow for the names of tags such as DateTime to be matched within the same test rather than having to run a separate test.

The alternative is to add a new test, TiffDateTimeTagTest. I would probablly still use a grep on tifftools dump to do this to ensure all IFDs and subIFDs are looked at.

eg.
! tifftools dump image.tif | grep -aq 'DateTime 306 (0x132) ASCII'

Both would require switching to a container containing tifftools

[thomasyu888]

Thanks @adamjtaylor I'm happy to give you write permission to the repo. One second while I make some adjustments. I like what you've proposed for a test. We can certainly create a new test OR just repurpose this GrepDateTest to be TiffDateTimeTagTest