switch: fix errors and comments related to -c and -C

In d787d31 (checkout: split part of it to new command 'switch',
2019-03-29), the `git switch` command was created by extracting the
common functionality of cmd_checkout() in checkout_main(). However, in
b7b5fce (switch: better names for -b and -B, 2019-03-29), the branch
creation and force creation options for 'switch' were changed to -c and
-C, respectively. As a result of this, error messages and comments that
previously referred to `-b` and `-B` became invalid for `git switch`.

For error messages that refer to `-b` and `-B`, use a format string
instead so that `-c` and `-C` can be printed when `git switch` is
invoked.

Reported-by: Robert Simpson
Signed-off-by: Denton Liu <[email protected]>
Reviewed-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Denton-L

builtin/checkout.c

@@ -1487,6 +1487,9 @@ static struct option *add_checkout_path_options(struct checkout_opts *opts,
 	return newopts;
 }
 
+/* create-branch option (either b or c) */
+static char cb_option = 'b';
+
 static int checkout_main(int argc, const char **argv, const char *prefix,
 			 struct checkout_opts *opts, struct option *options,
 			 const char * const usagestr[])
@@ -1530,7 +1533,8 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 	}
 
 	if ((!!opts->new_branch + !!opts->new_branch_force + !!opts->new_orphan_branch) > 1)
-		die(_("-b, -B and --orphan are mutually exclusive"));
+		die(_("-%c, -%c and --orphan are mutually exclusive"),
+				cb_option, toupper(cb_option));
 
 	if (opts->overlay_mode == 1 && opts->patch_mode)
 		die(_("-p and --overlay are mutually exclusive"));
@@ -1558,15 +1562,15 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 	/*
 	 * From here on, new_branch will contain the branch to be checked out,
 	 * and new_branch_force and new_orphan_branch will tell us which one of
-	 * -b/-B/--orphan is being used.
+	 * -b/-B/-c/-C/--orphan is being used.
 	 */
 	if (opts->new_branch_force)
 		opts->new_branch = opts->new_branch_force;
 
 	if (opts->new_orphan_branch)
 		opts->new_branch = opts->new_orphan_branch;
 
-	/* --track without -b/-B/--orphan should DWIM */
+	/* --track without -c/-C/-b/-B/--orphan should DWIM */
 	if (opts->track != BRANCH_TRACK_UNSPECIFIED && !opts->new_branch) {
 		const char *argv0 = argv[0];
 		if (!argc || !strcmp(argv0, "--"))
@@ -1575,7 +1579,7 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 		skip_prefix(argv0, "remotes/", &argv0);
 		argv0 = strchr(argv0, '/');
 		if (!argv0 || !argv0[1])
-			die(_("missing branch name; try -b"));
+			die(_("missing branch name; try -%c"), cb_option);
 		opts->new_branch = argv0 + 1;
 	}
 
@@ -1766,6 +1770,8 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
 	options = add_common_options(&opts, options);
 	options = add_common_switch_branch_options(&opts, options);
 
+	cb_option = 'c';
+
 	ret = checkout_main(argc, argv, prefix, &opts,
 			    options, switch_branch_usage);
 	FREE_AND_NULL(options);