format-patch: move get_patch_filename() into log-tree

Signed-off-by: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-log.c

diff --git a/builtin-log.c b/builtin-log.c
index 6a27ce6..4f438db 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -417,7 +417,6 @@
 }
 
 /* format-patch */
-#define FORMAT_PATCH_NAME_MAX 64
 
 static const char *fmt_patch_suffix = ".patch";
 static int numbered = 0;
@@ -512,29 +511,6 @@
 	return git_log_config(var, value, cb);
 }
 
-
-static void get_patch_filename(struct commit *commit, int nr,
-			       const char *suffix, struct strbuf *buf)
-{
-	int suffix_len = strlen(suffix) + 1;
-	int start_len = buf->len;
-
-	strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
-	if (commit) {
-		format_commit_message(commit, "%f", buf, DATE_NORMAL);
-		/*
-		 * Replace characters at the end with the suffix if the
-		 * filename is too long
-		 */
-		if (buf->len + suffix_len > FORMAT_PATCH_NAME_MAX + start_len)
-			strbuf_splice(buf,
-				start_len + FORMAT_PATCH_NAME_MAX - suffix_len,
-				suffix_len, suffix, suffix_len);
-		else
-			strbuf_addstr(buf, suffix);
-	}
-}
-
 static FILE *realstdout = NULL;
 static const char *output_directory = NULL;
 static int outdir_offset;

log-tree.c

diff --git a/log-tree.c b/log-tree.c
index 9565c18..aee9995 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -179,6 +179,28 @@
 	return 0;
 }
 
+void get_patch_filename(struct commit *commit, int nr, const char *suffix,
+			struct strbuf *buf)
+{
+	int suffix_len = strlen(suffix) + 1;
+	int start_len = buf->len;
+
+	strbuf_addf(buf, commit ? "%04d-" : "%d", nr);
+	if (commit) {
+		format_commit_message(commit, "%f", buf, DATE_NORMAL);
+		/*
+		 * Replace characters at the end with the suffix if the
+		 * filename is too long
+		 */
+		if (buf->len + suffix_len > FORMAT_PATCH_NAME_MAX + start_len)
+			strbuf_splice(buf,
+				start_len + FORMAT_PATCH_NAME_MAX - suffix_len,
+				suffix_len, suffix, suffix_len);
+		else
+			strbuf_addstr(buf, suffix);
+	}
+}
+
 void log_write_email_headers(struct rev_info *opt, const char *name,
 			     const char **subject_p,
 			     const char **extra_headers_p,

log-tree.h

diff --git a/log-tree.h b/log-tree.h
index f2a9008..78dc5be 100644
--- a/log-tree.h
+++ b/log-tree.h
@@ -19,4 +19,8 @@
 			     int *need_8bit_cte_p);
 void load_ref_decorations(void);
 
+#define FORMAT_PATCH_NAME_MAX 64
+void get_patch_filename(struct commit *commit, int nr, const char *suffix,
+			struct strbuf *buf);
+
 #endif