umputun / revdiff / 24055872851

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Detect binary files in diff with size delta and IsBinary flag (#44)

* Detect binary files in diff and show placeholder with file size delta

Binary files in git diffs previously showed as blank (no content) because
ParseUnifiedDiff never found hunk headers for them. Now detects git's
"Binary files ... differ" marker and returns a placeholder enriched with
size info from git diff --stat (e.g. "(binary file: 1.0 KB → 2.0 KB)").

* Add IsBinary field and header-based new/deleted detection for binary diffs

Replace fragile string comparison (Content == BinaryPlaceholder) with an
explicit IsBinary bool on DiffLine. ParseUnifiedDiff now tracks "new file
mode" / "deleted file mode" from diff headers so the placeholder content
is correct even when git diff --stat fails (e.g. non-English locale).
Also clarifies locale assumptions in binaryStatRe and binaryFilesRe
comments and uses binaryChangeKind for accurate create/delete detection
when stat parsing succeeds.

* Refine binary diff helpers

79 of 89 new or added lines in 2 files covered. (88.76%)

4154 of 4559 relevant lines covered (91.12%)

460.74 hits per line