Re: [PATCH 5/5] interpret-trailers: add --parse convenience option

The last few commits have added command line options that
can turn interpret-trailers into a parsing tool. Since
they'd most often be used together, let's provide a
convenient single option for callers to invoke this mode.

This is implemented as a callback rather than a boolean so
that its effect is applied immediately, as if those options
had been specified. Later options can then override them.
E.g.:

  git interpret-trailers --parse --no-normalize

would work.

Signed-off-by: Jeff King <redacted>
---
 Documentation/git-interpret-trailers.txt |  4 ++++
 builtin/interpret-trailers.c             | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
index 6d867e8ab3..ab2d5c7696 100644
--- a/Documentation/git-interpret-trailers.txt
+++ b/Documentation/git-interpret-trailers.txt

@@ -93,6 +93,10 @@ OPTIONS
        line, with any existing whitespace continuation folded into a
        single line.

+--parse::
+       A convenience alias for `--only-trailers --only-existing
+       --normalize`.