Improve make-temp-file performance on local files

* lisp/files.el (make-temp-file): Let make-temp-file-internal do
the work of inserting the text.
* src/fileio.c (Fmake_temp_file_internal): New arg TEXT.
All callers changed.

3 files changed, 25 insertions, 19 deletions

diff --git a/lisp/files.el b/lisp/files.el
index a2b474f8d2b..0311cc6d210 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1404,24 +1404,20 @@ of PREFIX, and expanding against `temporary-file-directory' if necessary),
 is guaranteed to point to a newly created file.
 You can then use `write-region' to write new data into the file.
 
-If TEXT is non-nil, it will be inserted in the new file. Otherwise
-the file will be empty.
-
 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
 
-If SUFFIX is non-nil, add that at the end of the file name."
+If SUFFIX is non-nil, add that at the end of the file name.
+
+If TEXT is a string, insert it into the new file; DIR-FLAG should be nil.
+Otherwise the file will be empty."
   (let ((absolute-prefix
 	 (if (or (zerop (length prefix)) (member prefix '("." "..")))
 	     (concat (file-name-as-directory temporary-file-directory) prefix)
-	   (expand-file-name prefix temporary-file-directory)))
-        (contents (if (stringp text) text "")))
+	   (expand-file-name prefix temporary-file-directory))))
     (if (find-file-name-handler absolute-prefix 'write-region)
-        (files--make-magic-temp-file absolute-prefix dir-flag suffix contents)
-      (let ((file (make-temp-file-internal absolute-prefix
-			                   (if dir-flag t) (or suffix ""))))
-        (when (and (stringp text) (not dir-flag))
-          (write-region contents nil file nil 'silent))
-        file))))
+        (files--make-magic-temp-file absolute-prefix dir-flag suffix text)
+      (make-temp-file-internal absolute-prefix
+			       (if dir-flag t) (or suffix "") text))))
 
 (defun files--make-magic-temp-file (absolute-prefix
                                     &optional dir-flag suffix text)
diff --git a/src/fileio.c b/src/fileio.c
index 1b832be344d..6b3bdf2154d 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -657,18 +657,20 @@ In Unix-syntax, this function just removes the final slash.  */)
 }
 
 DEFUN ("make-temp-file-internal", Fmake_temp_file_internal,
-       Smake_temp_file_internal, 3, 3, 0,
+       Smake_temp_file_internal, 4, 4, 0,
        doc: /* Generate a new file whose name starts with PREFIX, a string.
 Return the name of the generated file.  If DIR-FLAG is zero, do not
 create the file, just its name.  Otherwise, if DIR-FLAG is non-nil,
 create an empty directory.  The file name should end in SUFFIX.
 Do not expand PREFIX; a non-absolute PREFIX is relative to the Emacs
-working directory.
+working directory.  If TEXT is a string, insert it into the newly
+created file.
 
 Signal an error if the file could not be created.
 
 This function does not grok magic file names.  */)
-  (Lisp_Object prefix, Lisp_Object dir_flag, Lisp_Object suffix)
+  (Lisp_Object prefix, Lisp_Object dir_flag, Lisp_Object suffix,
+   Lisp_Object text)
 {
   CHECK_STRING (prefix);
   CHECK_STRING (suffix);
@@ -688,7 +690,15 @@ This function does not grok magic file names.  */)
 	      : EQ (dir_flag, make_number (0)) ? GT_NOCREATE
 	      : GT_DIR);
   int fd = gen_tempname (data, suffix_len, O_BINARY | O_CLOEXEC, kind);
-  if (fd < 0 || (NILP (dir_flag) && emacs_close (fd) != 0))
+  bool failed = fd < 0;
+  if (!failed)
+    {
+      val = DECODE_FILE (val);
+      if (STRINGP (text) && SBYTES (text) != 0)
+	write_region (text, Qnil, val, Qnil, Qnil, Qnil, Qnil, fd);
+      failed = NILP (dir_flag) && emacs_close (fd) != 0;
+    }
+  if (failed)
     {
       static char const kind_message[][32] =
 	{
@@ -698,7 +708,7 @@ This function does not grok magic file names.  */)
 	};
       report_file_error (kind_message[kind], prefix);
     }
-  return DECODE_FILE (val);
+  return val;
 }
 
 
@@ -715,7 +725,7 @@ For that reason, you should normally use `make-temp-file' instead.  */)
   (Lisp_Object prefix)
 {
   return Fmake_temp_file_internal (prefix, make_number (0),
-				   empty_unibyte_string);
+				   empty_unibyte_string, Qnil);
 }
 
 DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
diff --git a/src/filelock.c b/src/filelock.c
index fec9bc044ae..fd4f0aa864e 100644
--- a/src/filelock.c
+++ b/src/filelock.c
@@ -210,7 +210,7 @@ get_boot_time (void)
 		 names up to 8 bytes long.  Choose a 2 byte prefix, so
 		 the 6-byte suffix does not make the name too long.  */
 	      filename = Fmake_temp_file_internal (build_string ("wt"), Qnil,
-						   empty_unibyte_string);
+						   empty_unibyte_string, Qnil);
 	      CALLN (Fcall_process, build_string ("gzip"), Qnil,
 		     list2 (QCfile, filename), Qnil,
 		     build_string ("-cd"), tempname);