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Re: ange-ftp + cperl-mode + replace-string bug

From: Stefan Monnier
Subject: Re: ange-ftp + cperl-mode + replace-string bug
Date: 12 Jan 2002 15:26:38 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1.50

>>>>> "Vladimir" == Vladimir Volovich <address@hidden> writes:
> "VV" == Vladimir Volovich writes:
VV> This bug is present when i use BOTH ange-ftp and cperl-mode: if i
VV> open a local file via C-x C-f, or if i do not start cperl-mode,
VV> there is no such bug.
> nope -- it appears that the bug is independent of cperl-mode, and
> appears because of ange-ftp hooks which are called when i do a
> replace-string.

That's indeed my suspicion.  There's a save-match-data missing somewhere
I've just spent a fair amount of time looking for such missing
save-match-data and it seems like it's a real mess.

Could you retry your experiment after applying the patch below ?


PS: It's not the first time a problem shows up because of a file-handler
  not properly saving the match data.  It often leads to rather nasty
  and subtle bugs.  Is there any reason why we don't do `save-match-data'
  directly inside `ange-ftp-hook-function' once and for all instead
  of having those save-match-data sprinkled everywhere (and worse yet:
  it's really non-obvious when such a save-match-data is missing) ?
  Is there such a thing as a file operation for which it is correct
  to modify the match-data ?

--- ange-ftp.el.~     Mon Nov 19 15:25:41 2001
+++ ange-ftp.el Sat Jan 12 15:20:12 2002
@@ -2092,6 +2092,7 @@
        ;; grab a suitable process.
        (setq proc (ange-ftp-start-process host user name))
+       (save-match-data
        ;; login to FTP server.
        (if (and (ange-ftp-use-smart-gateway-p host)
@@ -2111,7 +2112,7 @@
                              proc "passive" "Trying passive mode..." nil))))
            (if (string-match "\\?\\|refused" answer)
                (message "Trying passive mode...ok")
-             (message "Trying passive mode...failed"))))
+               (message "Trying passive mode...failed")))))
        ;; Run any user-specified hooks.  Note that proc, host and user are
        ;; dynamically bound at this point.
@@ -2211,6 +2212,7 @@
             host-type (ange-ftp-host-type host user))
        ;; This will trigger an FTP login, if one doesn't exist
        (eq cmd0 'dir))
+      (save-match-data
       (setq cmd1 (funcall
                  (or (cdr (assq host-type ange-ftp-fix-dir-name-func-alist))
@@ -2229,7 +2231,7 @@
       ;; directory in question and ls ".".
       (when (string-match " " cmd1)
        (ange-ftp-cd host user (nth 1 cmd))
-       (setq cmd1 "."))
+         (setq cmd1 ".")))
       ;; If the remote ls can take switches, put them in
       (or (memq host-type ange-ftp-dumb-host-types)
@@ -3840,7 +3842,8 @@
       (if (or (and (eq system-type 'windows-nt)
-                  (string-match "^[a-zA-Z]:[/\\]$" ange-ftp-this-dir))
+                  (save-match-data
+                    (string-match "^[a-zA-Z]:[/\\]$" ange-ftp-this-dir)))
              (string-equal "/" ange-ftp-this-dir))
          (nconc (all-completions file (ange-ftp-generate-root-prefixes))
                 (ange-ftp-real-file-name-all-completions file
@@ -3872,7 +3875,8 @@
                     (function ange-ftp-file-entry-active-p)))))))
       (if (or (and (eq system-type 'windows-nt)
-                  (string-match "^[a-zA-Z]:[/\\]$" ange-ftp-this-dir))
+                  (save-match-data
+                    (string-match "^[a-zA-Z]:[/\\]$" ange-ftp-this-dir)))
              (string-equal "/" ange-ftp-this-dir))
@@ -4317,15 +4321,17 @@
 ;; So the format conversion should be all that is needed.
 (defun ange-ftp-insert-directory (file switches &optional wildcard full)
+  (save-match-data
   (let ((short (ange-ftp-abbreviate-filename file))
        (parsed (ange-ftp-ftp-name (expand-file-name file))))
     (if parsed
         (if wildcard
             (let ((default-directory (file-name-directory file)))
-              (ange-ftp-ls (file-name-nondirectory file) switches nil nil t))
+                (ange-ftp-ls (file-name-nondirectory file)
+                             switches nil nil t))
           (ange-ftp-ls file switches full)))
-      (ange-ftp-real-insert-directory file switches wildcard full))))
+       (ange-ftp-real-insert-directory file switches wildcard full)))))
 (defun ange-ftp-dired-uncache (dir)
   (if (ange-ftp-ftp-name (expand-file-name dir))
@@ -4355,6 +4361,10 @@
        (ange-ftp-real-shell-command command output-buffer error-buffer)
       (if (> (length name) 0)          ; else it's $HOME
          (setq command (concat "cd " name "; " command)))
+      ;; Remove port from the hostname.
+      (save-match-data
+       (when (string-match "\\(.*\\)#\\(.*\\)" host)
+         (setq host (match-string 1 host))))
       (setq command
            (format  "%s %s \"%s\""     ; remsh -l USER does not work well
                                        ; on a hp-ux machine I tried

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