sha1_name.c: get rid of get_sha1_with_mode_1()

The only external caller is setup.c that tries to give a nicer error
message when an object name is misspelt (e.g. "HEAD:cashe.h").
Retire it and give the caller a dedicated and more intuitive API
function maybe_die_on_misspelt_object_name().

Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -812,11 +812,8 @@ struct object_context {
 };
 
 extern int get_sha1(const char *str, unsigned char *sha1);
-extern int get_sha1_with_mode_1(const char *str, unsigned char *sha1, unsigned *mode, int only_to_die, const char *prefix);
-static inline int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode)
-{
-	return get_sha1_with_mode_1(str, sha1, mode, 0, NULL);
-}
+extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
+extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
 extern int get_sha1_with_context(const char *str, unsigned char *sha1, struct object_context *orc);
 
 /*

setup.c

@@ -55,18 +55,14 @@ int check_filename(const char *prefix, const char *arg)
 
 static void NORETURN die_verify_filename(const char *prefix, const char *arg)
 {
-	unsigned char sha1[20];
-	unsigned mode;
-
 	/*
 	 * Saying "'(icase)foo' does not exist in the index" when the
 	 * user gave us ":(icase)foo" is just stupid.  A magic pathspec
 	 * begins with a colon and is followed by a non-alnum; do not
-	 * let get_sha1_with_mode_1(only_to_die=1) to even trigger.
+	 * let maybe_die_on_misspelt_object_name() even trigger.
 	 */
 	if (!(arg[0] == ':' && !isalnum(arg[1])))
-		/* try a detailed diagnostic ... */
-		get_sha1_with_mode_1(arg, sha1, &mode, 1, prefix);
+		maybe_die_on_misspelt_object_name(arg, prefix);
 
 	/* ... or fall back the most general message. */
 	die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"

sha1_name.c

@@ -1125,12 +1125,24 @@ static int get_sha1_with_context_1(const char *name, unsigned char *sha1,
 	return ret;
 }
 
-int get_sha1_with_mode_1(const char *name, unsigned char *sha1, unsigned *mode,
-			 int only_to_die, const char *prefix)
+/*
+ * Call this function when you know "name" given by the end user must
+ * name an object but it doesn't; the function _may_ die with a better
+ * diagnostic message than "no such object 'name'", e.g. "Path 'doc' does not
+ * exist in 'HEAD'" when given "HEAD:doc", or it may return in which case
+ * you have a chance to diagnose the error further.
+ */
+void maybe_die_on_misspelt_object_name(const char *name, const char *prefix)
 {
 	struct object_context oc;
-	int ret;
-	ret = get_sha1_with_context_1(name, sha1, &oc, only_to_die, prefix);
+	unsigned char sha1[20];
+	get_sha1_with_context_1(name, sha1, &oc, 1, prefix);
+}
+
+int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode)
+{
+	struct object_context oc;
+	int ret = get_sha1_with_context_1(str, sha1, &oc, 0, NULL);
 	*mode = oc.mode;
 	return ret;
 }