Merge branch 'js/maint-cover-letter-non-ascii' into maint

* js/maint-cover-letter-non-ascii:
  Correctly mark cover letters' encodings if they are not pure ASCII
  Expose the has_non_ascii() function

builtin-log.c

@@ -664,6 +664,10 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 	log_write_email_headers(rev, head, &subject_start, &extra_headers,
 				&need_8bit_cte);
 
+	for (i = 0; !need_8bit_cte && i < nr; i++)
+		if (has_non_ascii(list[i]->buffer))
+			need_8bit_cte = 1;
+
 	msg = body;
 	pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
 		     encoding);

commit.h

@@ -64,6 +64,7 @@ enum cmit_fmt {
 };
 
 extern int non_ascii(int);
+extern int has_non_ascii(const char *text);
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 extern char *reencode_commit_message(const struct commit *commit,
 				     const char **encoding_p);

log-tree.c

@@ -168,18 +168,6 @@ static unsigned int digits_in_number(unsigned int number)
 	return result;
 }
 
-static int has_non_ascii(const char *s)
-{
-	int ch;
-	if (!s)
-		return 0;
-	while ((ch = *s++) != '\0') {
-		if (non_ascii(ch))
-			return 1;
-	}
-	return 0;
-}
-
 void get_patch_filename(struct commit *commit, int nr, const char *suffix,
 			struct strbuf *buf)
 {

pretty.c

@@ -86,6 +86,18 @@ int non_ascii(int ch)
 	return !isascii(ch) || ch == '\033';
 }
 
+int has_non_ascii(const char *s)
+{
+	int ch;
+	if (!s)
+		return 0;
+	while ((ch = *s++) != '\0') {
+		if (non_ascii(ch))
+			return 1;
+	}
+	return 0;
+}
+
 static int is_rfc2047_special(char ch)
 {
 	return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));