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 it creates a clean slate for
placing build outputs in adjacent directories.

The --no-src option allows users to opt-out of the default behavior. The
parse-opt logic automatically figures out that '--src' is a possible
flag that negates '--no-src'.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>

Author: derrickstolee

Documentation/scalar.txt

@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 scalar clone [--single-branch] [--branch <main-branch>] [--full-clone]
-	[--local-cache-path <path>] [--cache-server-url <url>]
+	[--local-cache-path <path>] [--cache-server-url <url>] [--[no-]src]
 	<url> [<enlistment>]
 scalar list
 scalar register [<enlistment>]
@@ -83,6 +83,9 @@ 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::
+	Skip adding a `src` directory within the target enlistment.
+
 --[no-]full-clone::
 	A sparse-checkout is initialized by default. This behavior can be
 	turned off via `--full-clone`.

scalar.c

@@ -707,6 +707,8 @@ static int cmd_clone(int argc, const char **argv)
 	int full_clone = 0, single_branch = 0, show_progress = isatty(2);
 	const char *cache_server_url = NULL, *local_cache_root = NULL;
 	char *default_cache_server_url = NULL, *local_cache_root_abs = NULL;
+	const char *enlistment_parent;
+	int no_src = 0;
 	struct option clone_options[] = {
 		OPT_STRING('b', "branch", &branch, N_("<branch>"),
 			   N_("branch to checkout after clone")),
@@ -715,6 +717,8 @@ 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, "no-src", &no_src,
+			 N_("skip creating a 'src' directory")),
 		OPT_STRING(0, "cache-server-url", &cache_server_url,
 			   N_("<url>"),
 			   N_("the url or friendly name of the cache server")),
@@ -765,7 +769,13 @@ static int cmd_clone(int argc, const char **argv)
 
 	ensure_absolute_path(enlistment, &enlistment);
 
-	dir = xstrfmt("%s/src", enlistment);
+	if (!no_src) {
+		dir = xstrfmt("%s/src", enlistment);
+		enlistment_parent = "../..";
+	} else {
+		dir = xstrdup(enlistment);
+		enlistment_parent = "..";
+	}
 
 	if (!local_cache_root)
 		local_cache_root = local_cache_root_abs =
@@ -806,7 +816,7 @@ static int cmd_clone(int argc, const char **argv)
 		struct strbuf path = STRBUF_INIT;
 
 		strbuf_addstr(&path, enlistment);
-		if (chdir("../..") < 0 ||
+		if (chdir(enlistment_parent) < 0 ||
 		    remove_dir_recursively(&path, 0) < 0)
 			die(_("'--local-cache-path' cannot be inside the src "
 			      "folder;\nCould not remove '%s'"), enlistment);

t/t9210-scalar.sh

@@ -391,4 +391,12 @@ test_expect_success '`scalar delete` with existing repo' '
 	test_path_is_missing existing
 '
 
+test_expect_success '`scalar clone --no-src`' '
+	scalar clone --src "file://$(pwd)" with-src &&
+	scalar clone --no-src "file://$(pwd)" without-src &&
+
+	test_path_is_dir with-src/src &&
+	test_path_is_missing without-src/src
+'
+
 test_done