tex-mode and shell-quote-argument

[Stefan Monnier <monnier@iro.umontreal.ca>]

Could someone explain to me more clearly the justification/need for the
latest patch to tex-mode:

	* textmodes/tex-mode.el: now that tex-send-command calls
	shell-quote-argument (2005-03-31 change), remove all calls to
	shell-quote-argument; they all end up invoking tex-send-command.
	The double quoting loses on filenames with non-safe characters,
	such as "@".  Reported by Frederik Fouvry.

AFAICT tex-send-command only quotes its second (optional) argument, yet the
patch seems to remove calls to shell-quote-argument applied to parts of the
command line that are not passed via the second argument but via the first.

As a matter of fact, of all the hunks in the patch (which I attached below
for reference), I find that only the last one makes sense.  Could someone
explain to me what's really going on?  Is it just a case of enthusiasm going
a bit over and beyond the call of duty?  Or am I missing something?


        Stefan


Index: lisp/textmodes/tex-mode.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/textmodes/tex-mode.el,v
retrieving revision 1.163
retrieving revision 1.164
diff -u -r1.163 -r1.164
--- lisp/textmodes/tex-mode.el	27 May 2005 12:59:58 -0000	1.163
+++ lisp/textmodes/tex-mode.el	28 May 2005 16:57:21 -0000	1.164
@@ -1633,11 +1633,11 @@
 (defvar tex-compile-commands
   '(((concat "pdf" tex-command
 	     " " (if (< 0 (length tex-start-commands))
-		     (shell-quote-argument tex-start-commands)) " %f")
+		     tex-start-commands) " %f")
      t "%r.pdf")
     ((concat tex-command
 	     " " (if (< 0 (length tex-start-commands))
-		     (shell-quote-argument tex-start-commands)) " %f")
+		     tex-start-commands) " %f")
      t "%r.dvi")
     ("yap %r &" "%r.dvi")
     ("xdvi %r &" "%r.dvi")
@@ -1900,8 +1900,8 @@
 	    (prog1 (file-name-directory (expand-file-name file))
 	      (setq file (file-name-nondirectory file))))
 	  (root (file-name-sans-extension file))
-	  (fspec (list (cons ?r (shell-quote-argument root))
-		       (cons ?f (shell-quote-argument file))))
+	  (fspec (list (cons ?r root)
+		       (cons ?f file)))
 	  (default (tex-compile-default fspec)))
      (list default-directory
 	   (completing-read
@@ -1922,14 +1922,13 @@
          (compile-command
           (if star
 	      (concat (substring command 0 star)
-		      (shell-quote-argument file)
+		      file
 		      (substring command (1+ star)))
             (concat command " "
 		    tex-start-options
 		    (if (< 0 (length tex-start-commands))
-			(concat
-			 (shell-quote-argument tex-start-commands) " "))
-		    (shell-quote-argument file)))))
+			(concat tex-start-commands " "))
+		    file))))
     (tex-send-tex-command compile-command dir)))
 
 (defun tex-send-tex-command (cmd &optional dir)
@@ -2232,8 +2231,7 @@
         (tex-start-shell))
       (tex-send-command
        (if alt tex-alt-dvi-print-command tex-dvi-print-command)
-       (shell-quote-argument
-	print-file-name-dvi)
+       print-file-name-dvi
        t))))
 
 (defun tex-alt-print ()