Better handling of git diff format in filterdiff/lsdiff/grepdiff

[twaugh]

Fixed: #22
Fixed: #27
Fixed: #59
Fixed: #68

[wetneb]

Thanks for working on this! I haven't been able to make it work, though.
I have run (while on your filterdiff-gitdiff branch)

$ git diff 004c178d031ad4e1f38fbf6acffcd19a648e6bab^! > diff
$ ./src/filterdiff -x NEWS diff > filtered
$ vimdiff diff filtered

But filtered still contains changes for the NEWS file (diff and filtered are identical).

[twaugh]

But filtered still contains changes for the NEWS file (diff and filtered are identical).

That's right -- it's backwards compatible right now, in that the default for --git-prefixes is keep. But look:

$ # -p1 has always been needed for git diff format input when matching/including:
$ git diff 8bf0b900ab4b89124972a38ad9a4b03be2af8269^! | src/filterdiff -p1 -x NEWS
$ # new --git-prefixes option will change default to 'strip' in 0.5.0:
$ git diff 8bf0b900ab4b89124972a38ad9a4b03be2af8269^! | src/filterdiff --git-prefixes=strip -x NEWS
$

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.62500% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.38%. Comparing base (b073854) to head (b7ef931).
⚠️ Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
src/filterdiff.c	96.05%	9 Missing ⚠️
src/diff.c	94.56%	5 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #103 +/- ##
==========================================
+ Coverage 81.02% 82.38% +1.36% 
==========================================
Files 5 5 Lines 3890 4128 +238 Branches 925 982 +57 ==========================================
+ Hits 3152 3401 +249 + Misses 738 727 -11 

Flag	Coverage Δ
unittests	82.38% <95.62%> (+1.36%)	⬆️

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