scalar: add --[no-]src option

Some users have strong aversions to Scalar's opinion that the repository
should be in a 'src' directory, even though this creates a clean slate
for placing build artifacts in adjacent directories.

The new --no-src option allows users to opt out of the default behavior.

While adding options, make sure the usage output by 'scalar clone -h'
reports the same as the SYNOPSIS line in Documentation/scalar.txt.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/scalar.txt

@@ -8,7 +8,8 @@ scalar - A tool for managing large Git repositories
 SYNOPSIS
 --------
 [verse]
-scalar clone [--single-branch] [--branch <main-branch>] [--full-clone] <url> [<enlistment>]
+scalar clone [--single-branch] [--branch <main-branch>] [--full-clone]
+	[--[no-]src] <url> [<enlistment>]
 scalar list
 scalar register [<enlistment>]
 scalar unregister [<enlistment>]
@@ -80,6 +81,11 @@ remote-tracking branch for the branch this option was used for the initial
 cloning. If the HEAD at the remote did not point at any branch when
 `--single-branch` clone was made, no remote-tracking branch is created.
 
+--[no-]src::
+	By default, `scalar clone` places the cloned repository within a
+	`<entlistment>/src` directory. Use `--no-src` to place the cloned
+	repository directly in the `<enlistment>` directory.
+
 --[no-]full-clone::
 	A sparse-checkout is initialized by default. This behavior can be
 	turned off via `--full-clone`.

scalar.c

@@ -409,6 +409,7 @@ static int cmd_clone(int argc, const char **argv)
 {
 	const char *branch = NULL;
 	int full_clone = 0, single_branch = 0, show_progress = isatty(2);
+	int src = 1;
 	struct option clone_options[] = {
 		OPT_STRING('b', "branch", &branch, N_("<branch>"),
 			   N_("branch to checkout after clone")),
@@ -417,10 +418,13 @@ static int cmd_clone(int argc, const char **argv)
 		OPT_BOOL(0, "single-branch", &single_branch,
 			 N_("only download metadata for the branch that will "
 			    "be checked out")),
+		OPT_BOOL(0, "src", &src,
+			 N_("create repository within 'src' directory")),
 		OPT_END(),
 	};
 	const char * const clone_usage[] = {
-		N_("scalar clone [<options>] [--] <repo> [<dir>]"),
+		N_("scalar clone [--single-branch] [--branch <main-branch>] [--full-clone]\n"
+		   "\t[--[no-]src] <url> [<enlistment>]"),
 		NULL
 	};
 	const char *url;
@@ -456,7 +460,10 @@ static int cmd_clone(int argc, const char **argv)
 	if (is_directory(enlistment))
 		die(_("directory '%s' exists already"), enlistment);
 
-	dir = xstrfmt("%s/src", enlistment);
+	if (src)
+		dir = xstrfmt("%s/src", enlistment);
+	else
+		dir = xstrdup(enlistment);
 
 	strbuf_reset(&buf);
 	if (branch)

t/t9211-scalar-clone.sh

@@ -180,4 +180,16 @@ test_expect_success 'scalar clone warns when background maintenance fails' '
 	grep "could not turn on maintenance" err
 '
 
+test_expect_success '`scalar clone --no-src`' '
+	scalar clone --src "file://$(pwd)/to-clone" with-src &&
+	scalar clone --no-src "file://$(pwd)/to-clone" without-src &&
+
+	test_path_is_dir with-src/src &&
+	test_path_is_missing without-src/src &&
+
+	(cd with-src/src && ls ?*) >with &&
+	(cd without-src && ls ?*) >without &&
+	test_cmp with without
+'
+
 test_done