Package: emacs;
Reported by: Tino Calancha <tino.calancha <at> gmail.com>
Date: Fri, 4 Aug 2017 13:55:01 UTC
Severity: wishlist
Tags: patch
Found in version 26.0.50
Done: Tino Calancha <tino.calancha <at> gmail.com>
Bug is archived. No further changes may be made.
Message #40 received at 27952 <at> debbugs.gnu.org (full text, mbox):
From: Tino Calancha <tino.calancha <at> gmail.com> To: Stefan Kangas <stefan <at> marxist.se> Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 27952 <at> debbugs.gnu.org, stefan monnier <monnier <at> iro.umontreal.ca>, Tino Calancha <tino.calancha <at> gmail.com> Subject: Re: bug#27952: 26.0.50; Combine archive-int-to-mode and tar-grind-file-mode Date: Fri, 8 May 2020 21:53:24 +0200 (CEST)
On Mon, 4 May 2020, Stefan Kangas wrote:
> Just another friendly ping, 6 months later. Please let us know if
> there has been any progress here. Thanks in advance.
Thank you for the reminder!
As I pointed out before, I wasn't really satisfied with my original
patch; the one adding a function with > 1 arguments: too complex and I
suspect failing side cases.
Instead, I propose the following easy one:
--8<-----------------------------cut here---------------start------------->8---
commit dc126c15c181afed9d236f4c1077e2c7f02b01df
Author: Tino Calancha <tino.calancha <at> gmail.com>
Date: Fri May 8 21:29:05 2020 +0200
Combine archive-int-to-mode and tar-grind-file-mode
Add a new function, file-modes-number-to-symbolic.
Make archive-int-to-mode and alias of it; use it
to define tar-grind-file-mode (Bug#27952).
* lisp/files.el (file-modes-number-to-symbolic): New defun.
* lisp/arc-mode.el (archive-int-to-mode): Make it an alias.
* lisp/tar-mode.el (tar-grind-file-mode):
Use file-modes-number-to-symbolic.
* test/lisp/arc-mode-tests.el (arc-mode-test-archive-int-to-mode)
* test/lisp/tar-mode-tests.el (tar-mode-test-tar-grind-file-mode):
Update test.
* test/lisp/files-tests.el (files-tests-file-modes-symbolic-to-number)
(files-tests-file-modes-number-to-symbolic): New tests.
* doc/lispref/files.texi (Changing Files): Document the new funtion.
* etc/NEWS (Lisp Changes in Emacs 28.1): Announce it.
diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index b3ad9b9964..686dbdb1ca 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -1909,6 +1909,11 @@ Changing Files
all.
@end defun
+@defun file-modes-number-to-symbolic modes
+This function converts a numeric file mode specification in
+@var{modes} into the equivalent symbolic form.
+@end defun
+
@defun set-file-times filename &optional time flag
This function sets the access and modification times of @var{filename}
to @var{time}. The return value is @code{t} if the times are successfully
diff --git a/etc/NEWS b/etc/NEWS
index ac93a76ff9..26426fc42b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -372,6 +372,10 @@ Use macro 'with-current-buffer-window' with action alist entry 'body-function'.
* Lisp Changes in Emacs 28.1
++++
+** New function 'file-modes-number-to-symbolic' to convert a numeric
+file mode specification into symbolic form.
+
** New macro 'dlet' to dynamically bind variables.
** The variable 'force-new-style-backquotes' has been removed.
diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index c918f06c80..0c801c67a5 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -563,28 +563,7 @@ archive-l-e
(aref str (- len i)))))
result))
-(defun archive-int-to-mode (mode)
- "Turn an integer like 0700 (i.e., 448) into a mode string like -rwx------."
- ;; FIXME: merge with tar-grind-file-mode.
- (if (null mode)
- "??????????"
- (string
- (if (zerop (logand 8192 mode))
- (if (zerop (logand 16384 mode)) ?- ?d)
- ?c) ; completeness
- (if (zerop (logand 256 mode)) ?- ?r)
- (if (zerop (logand 128 mode)) ?- ?w)
- (if (zerop (logand 64 mode))
- (if (zerop (logand 2048 mode)) ?- ?S)
- (if (zerop (logand 2048 mode)) ?x ?s))
- (if (zerop (logand 32 mode)) ?- ?r)
- (if (zerop (logand 16 mode)) ?- ?w)
- (if (zerop (logand 8 mode))
- (if (zerop (logand 1024 mode)) ?- ?S)
- (if (zerop (logand 1024 mode)) ?x ?s))
- (if (zerop (logand 4 mode)) ?- ?r)
- (if (zerop (logand 2 mode)) ?- ?w)
- (if (zerop (logand 1 mode)) ?- ?x))))
+(defalias 'archive-int-to-mode 'file-modes-number-to-symbolic)
(defun archive-calc-mode (oldmode newmode)
"From the integer OLDMODE and the string NEWMODE calculate a new file mode.
diff --git a/lisp/files.el b/lisp/files.el
index c34fe00388..dba704f7a4 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -7552,6 +7552,27 @@ file-modes-rights-to-number
op char-right)))
num-rights))
+(defun file-modes-number-to-symbolic (mode)
+ (string
+ (if (zerop (logand 8192 mode))
+ (if (zerop (logand 16384 mode)) ?- ?d)
+ ?c) ; completeness
+ (if (zerop (logand 256 mode)) ?- ?r)
+ (if (zerop (logand 128 mode)) ?- ?w)
+ (if (zerop (logand 64 mode))
+ (if (zerop (logand 2048 mode)) ?- ?S)
+ (if (zerop (logand 2048 mode)) ?x ?s))
+ (if (zerop (logand 32 mode)) ?- ?r)
+ (if (zerop (logand 16 mode)) ?- ?w)
+ (if (zerop (logand 8 mode))
+ (if (zerop (logand 1024 mode)) ?- ?S)
+ (if (zerop (logand 1024 mode)) ?x ?s))
+ (if (zerop (logand 4 mode)) ?- ?r)
+ (if (zerop (logand 2 mode)) ?- ?w)
+ (if (zerop (logand 512 mode))
+ (if (zerop (logand 1 mode)) ?- ?x)
+ (if (zerop (logand 1 mode)) ?T ?t))))
+
(defun file-modes-symbolic-to-number (modes &optional from)
"Convert symbolic file modes to numeric file modes.
MODES is the string to convert, it should match
diff --git a/lisp/tar-mode.el b/lisp/tar-mode.el
index a3c1715b1e..73978ffc4a 100644
--- a/lisp/tar-mode.el
+++ b/lisp/tar-mode.el
@@ -480,23 +480,9 @@ tar-clip-time-string
(defun tar-grind-file-mode (mode)
"Construct a `rw-r--r--' string indicating MODE.
-MODE should be an integer which is a file mode value."
- (string
- (if (zerop (logand 256 mode)) ?- ?r)
- (if (zerop (logand 128 mode)) ?- ?w)
- (if (zerop (logand 2048 mode))
- (if (zerop (logand 64 mode)) ?- ?x)
- (if (zerop (logand 64 mode)) ?S ?s))
- (if (zerop (logand 32 mode)) ?- ?r)
- (if (zerop (logand 16 mode)) ?- ?w)
- (if (zerop (logand 1024 mode))
- (if (zerop (logand 8 mode)) ?- ?x)
- (if (zerop (logand 8 mode)) ?S ?s))
- (if (zerop (logand 4 mode)) ?- ?r)
- (if (zerop (logand 2 mode)) ?- ?w)
- (if (zerop (logand 512 mode))
- (if (zerop (logand 1 mode)) ?- ?x)
- (if (zerop (logand 1 mode)) ?T ?t))))
+MODE should be an integer which is a file mode value.
+For instance, if mode is #o700, then it produces `rwx------'."
+ (substring (file-modes-number-to-symbolic mode) 1))
(defun tar-header-block-summarize (tar-hblock &optional mod-p)
"Return a line similar to the output of `tar -vtf'."
diff --git a/test/lisp/arc-mode-tests.el b/test/lisp/arc-mode-tests.el
index df658b9813..22ca7e2ec5 100644
--- a/test/lisp/arc-mode-tests.el
+++ b/test/lisp/arc-mode-tests.el
@@ -28,7 +28,7 @@ arc-mode-tests-data-directory
(let ((alist (list (cons 448 "-rwx------")
(cons 420 "-rw-r--r--")
(cons 292 "-r--r--r--")
- (cons 512 "----------")
+ (cons 512 "---------T")
(cons 1024 "------S---") ; Bug#28092
(cons 2048 "---S------"))))
(dolist (x alist)
diff --git a/test/lisp/files-tests.el b/test/lisp/files-tests.el
index 05d9ceebf1..4b902fd82a 100644
--- a/test/lisp/files-tests.el
+++ b/test/lisp/files-tests.el
@@ -1164,6 +1164,42 @@ files-tests-file-attributes-equal
(should-not (make-directory a/b t))
(delete-directory dir 'recursive)))
+(ert-deftest files-tests-file-modes-symbolic-to-number ()
+ (let ((alist (list (cons "a=rwx" #o777)
+ (cons "o=t" #o1000)
+ (cons "o=xt" #o1001)
+ (cons "o=tx" #o1001) ; Order doesn't matter.
+ (cons "u=rwx,g=rx,o=rx" #o755)
+ (cons "u=rwx,g=,o=" #o700)
+ (cons "u=rwx" #o700) ; Empty permissions can be ignored.
+ (cons "u=rw,g=r,o=r" #o644)
+ (cons "u=rw,g=r,o=t" #o1640)
+ (cons "u=rw,g=r,o=xt" #o1641)
+ (cons "u=rwxs,g=rs,o=xt" #o7741)
+ (cons "u=rws,g=rs,o=t" #o7640)
+ (cons "u=rws,g=rs,o=r" #o6644)
+ (cons "a=r" #o444)
+ (cons "u=S" nil)
+ (cons "u=T" nil)
+ (cons "u=Z" nil))))
+ (dolist (x alist)
+ (if (cdr-safe x)
+ (should (equal (cdr x) (file-modes-symbolic-to-number (car x))))
+ (should-error (file-modes-symbolic-to-number (car x)))))))
+
+(ert-deftest files-tests-file-modes-number-to-symbolic ()
+ (let ((alist (list (cons #o755 "-rwxr-xr-x")
+ (cons #o700 "-rwx------")
+ (cons #o644 "-rw-r--r--")
+ (cons #o1640 "-rw-r----T")
+ (cons #o1641 "-rw-r----t")
+ (cons #o7741 "-rwsr-S--t")
+ (cons #o7640 "-rwSr-S--T")
+ (cons #o6644 "-rwSr-Sr--")
+ (cons #o444 "-r--r--r--"))))
+ (dolist (x alist)
+ (should (equal (cdr x) (file-modes-number-to-symbolic (car x)))))))
+
(ert-deftest files-tests-no-file-write-contents ()
"Test that `write-contents-functions' permits saving a file.
Usually `basic-save-buffer' will prompt for a file name if the
diff --git a/test/lisp/tar-mode-tests.el b/test/lisp/tar-mode-tests.el
index bc41b863da..f05389df60 100644
--- a/test/lisp/tar-mode-tests.el
+++ b/test/lisp/tar-mode-tests.el
@@ -29,7 +29,8 @@ tar-mode-tests-data-directory
(cons 420 "rw-r--r--")
(cons 292 "r--r--r--")
(cons 512 "--------T")
- (cons 1024 "-----S---"))))
+ (cons 1024 "-----S---")
+ (cons 2048 "--S------"))))
(dolist (x alist)
(should (equal (cdr x) (tar-grind-file-mode (car x)))))))
--8<-----------------------------cut here---------------end--------------->8---
In GNU Emacs 28.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.24.5, cairo version 1.16.0)
of 2020-05-08 built on calancha-pc.dy.bbexcite.jp
Repository revision: 4b8e6939bf7664fda33a7aaa03d2d8069358ff7b
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.