[PATCH] diff: allow --recurse-submodules as an synonym for --submodule

[Stefan Beller]

Many commands have flags to recurse into submodules, which is named
--recurse-submodules. The diff family also has a submodule recursion flag,
but that is named differently. Add a synonym --recurse-submodules, which
means the same as the --submodule flag, such that across all git commands
supporting submodules we have the --recurse-submodules flag available.

Signed-off-by: Stefan Beller <sbel...@google.com>
---
 Documentation/diff-options.txt | 1 +
 diff.c                         | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 0378cd574eb..694c97338c9 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -227,6 +227,7 @@ linkgit:git-config[1]).
        of the `--diff-filter` option on what the status letters mean.
 
 --submodule[=<format>]::
+--recurse-submodules[=<format>]::
        Specify how differences in submodules are shown.  When specifying
        `--submodule=short` the 'short' format is used.  This format just
        shows the names of the commits at the beginning and end of the range.
diff --git a/diff.c b/diff.c
index 145cfbae592..d3d5a989bd1 100644
--- a/diff.c
+++ b/diff.c
@@ -5023,6 +5023,8 @@ int diff_opt_parse(struct diff_options *options,
                handle_ignore_submodules_arg(options, arg);
        } else if (skip_to_optional_arg_default(arg, "--submodule", &arg, 
"log"))
                return parse_submodule_opt(options, arg);
+       else if (skip_to_optional_arg_default(arg, "--recurse-submodules", 
&arg, "log"))
+               return parse_submodule_opt(options, arg);
        else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
                return parse_ws_error_highlight_opt(options, arg);
        else if (!strcmp(arg, "--ita-invisible-in-index"))
-- 
2.19.0.rc2.392.g5ba43deb5a-goog