Re: [GSoC][PATCH v5] submodule: port subcommand 'set-branch' from shell to C

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On 02-06-2020 22:05, Shourya Shukla wrote:
Convert submodule subcommand 'set-branch' to a builtin and call it via
'git-submodule.sh'.

Mentored-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
Mentored-by: Kaartic Sivaraam <kaartic.sivaraam@xxxxxxxxx>
Helped-by: Denton Liu <liu.denton@xxxxxxxxx>
Helped-by: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
Helped-by: Đoàn Trần Công Danh <congdanhqx@xxxxxxxxx>
Signed-off-by: Shourya Shukla <shouryashukla.oo@xxxxxxxxx>
---
Here is the v5 of the subcommand. Thank you Danh for the feedback! I
apologise for not replying on time. I have taken into account Danh's
suggestions on the `quiet` option as well as done the fixup Dscho
suggested (fixed by Junio here:
https://github.com/gitster/git/commit/77ba62f66ff8e3de54d81c240542edb42a2711c7)

  builtin/submodule--helper.c | 44 +++++++++++++++++++++++++++++++++++++
  git-submodule.sh            | 32 +++------------------------
  2 files changed, 47 insertions(+), 29 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index f50745a03f..a974e17571 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2284,6 +2284,49 @@ static int module_set_url(int argc, const char **argv, const char *prefix)
  	return 0;
  }
+static int module_set_branch(int argc, const char **argv, const char *prefix)
+{
+	int opt_default = 0, ret;
+	const char *opt_branch = NULL;
+	const char *path;
+	char *config_name;
+
+	/*
+	 * We accept the `quiet` option for uniformity across subcommands,
+	 * though there is nothing to make less verbose in this subcommand.
+	 */
+	struct option options[] = {
+		OPT_NOOP_NOARG('q', "quiet"),
+		OPT_BOOL('d', "default", &opt_default,
+			N_("set the default tracking branch to master")),
+		OPT_STRING('b', "branch", &opt_branch, N_("branch"),
+			N_("set the default tracking branch")),
+		OPT_END()
+	};
+	const char *const usage[] = {
+		N_("git submodule--helper set-branch [-q|--quiet] (-d|--default) <path>"),
+		N_("git submodule--helper set-branch [-q|--quiet] (-b|--branch) <branch> <path>"),
+		NULL
+	};

I'm having second thoughts about my suggestion[1] to include
the short option for '--quiet' in the usage. This is the only
usage in submodule--helper that mentions that '-q' is a short
hand for '--quiet'. That seems inconsistent. I see two ways but
I'm not sure which one of these would be better:

A. Dropping the mention of '-q' in this usage thus making it consistent
   with the other usages printed by submodule--helper.

B. Fixing other usages of submodule--helper to mention that '-q' is
   shorthand for quiet. This has the benefit of properly advertising
   the shorthand.

C. Just ignore this?

I also noticed one other thing. A quote from
Documentation/CodingGuidelines regarding the usage for reference:

 Optional parts are enclosed in square brackets:
   [<extra>]
   (Zero or one <extra>.)

   --exec-path[=<path>]
   (Option with an optional argument.  Note that the "=" is inside the
   brackets.)

   [<patch>...]
   (Zero or more of <patch>.  Note that the dots are inside, not
   outside the brackets.)

 Multiple alternatives are indicated with vertical bars:
   [-q | --quiet]
   [--utf8 | --no-utf8]

 Parentheses are used for grouping:
   [(<rev> | <range>)...]
   (Any number of either <rev> or <range>.  Parens are needed to make
   it clear that "..." pertains to both <rev> and <range>.)

   [(-p <parent>)...]
   (Any number of option -p, each with one <parent> argument.)

   git remote set-head <name> (-a | -d | <branch>)
   (One and only one of "-a", "-d" or "<branch>" _must_ (no square
   brackets) be provided.)

So, according to this, I think the usage should be ...

    git submodule--helper set-branch [-q | --quiet] [-d | --default] <path>

... and ...

git submodule--helper set-branch [-q|--quiet] [-b | --branch]<branch> <path>

... respectively.

+		NULL
+	};

---
Footnotes:

[1]: https://github.com/periperidip/git/commit/9a8918bf0688c583740b3dddafdba82f47972442#r39606384

--
Sivaraam



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