[Emacs-diffs] /srv/bzr/emacs/trunk r106244: * lisp/eshell/esh-cmd.el (eshell-rewrite-for-command): Fix last change.

[Stefan Monnier]

------------------------------------------------------------
revno: 106244
fixes bug(s): http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9907
committer: Stefan Monnier <address@hidden>
branch nick: trunk
timestamp: Sun 2011-10-30 04:01:31 -0400
message:
  * lisp/eshell/esh-cmd.el (eshell-rewrite-for-command): Fix last change.
  (eshell-do-eval): Handle multiple expressions in `while' body.
modified:
  lisp/ChangeLog
  lisp/eshell/esh-cmd.el

=== modified file 'lisp/ChangeLog'
--- a/lisp/ChangeLog    2011-10-30 03:58:48 +0000
+++ b/lisp/ChangeLog    2011-10-30 08:01:31 +0000
@@ -12,6 +12,7 @@
        Use backquotes and prefer setq to set.
        (eshell-lookup-function, function-p-func, eshell-functionp): Remove.
        (eshell-macrop): Use functionp.
+       (eshell-do-eval): Handle multiple expressions in `while' body.
 
 2011-10-30  Chong Yidong  <address@hidden>
 

=== modified file 'lisp/eshell/esh-cmd.el'
--- a/lisp/eshell/esh-cmd.el    2011-10-30 03:58:48 +0000
+++ b/lisp/eshell/esh-cmd.el    2011-10-30 08:01:31 +0000
@@ -480,19 +480,25 @@
       (let ((body (car (last terms))))
        (setcdr (last terms 2) nil)
        `(let ((for-items
-                (append
-                 ,@(mapcar
-                    (lambda (elem)
-                      (if (listp elem)
-                          elem
-                        `(list ,elem)))
-                    (cdr (cddr terms)))))
+                ;; Apparently, eshell-do-eval only works for immutable
+                ;; let-bindings, i.e. we cannot use `setq' on `for-items'.
+                ;; Instead we store the list in the car of a cons-cell (which
+                ;; acts as a ref-cell) so we can setcar instead of setq.
+                (list
+                 (append
+                  ,@(mapcar
+                     (lambda (elem)
+                       (if (listp elem)
+                           elem
+                         `(list ,elem)))
+                     (cdr (cddr terms))))))
                (eshell-command-body '(nil))
                (eshell-test-body '(nil)))
-           (while (consp for-items)
-             (let ((,(intern (cadr terms)) (car for-items)))
-               (eshell-protect ,(eshell-invokify-arg body t)))
-             (setq for-items (cdr for-items)))
+           (while (consp (car for-items))
+             (let ((,(intern (cadr terms)) (caar for-items)))
+               (eshell-protect
+                ,(eshell-invokify-arg body t)))
+             (setcar for-items (cdar for-items)))
            (eshell-close-handles
             eshell-last-command-status
             (list 'quote eshell-last-command-result))))))
@@ -805,9 +811,9 @@
           (when (memq (car head) eshell-deferrable-commands)
             (ignore
              (setcar head
-                     (intern-soft
-                      (concat (symbol-name (car head)) "*"))))))
-       ;; The last process in the pipe should get its handles
+                      (intern-soft
+                       (concat (symbol-name (car head)) "*"))))))
+        ;; The last process in the pipe should get its handles
        ;; redirected as we found them before running the pipe.
        ,(if (null (cdr pipeline))
             `(progn
@@ -1031,7 +1037,10 @@
        (unless (car eshell-test-body)
          (setcar eshell-test-body (eshell-copy-tree (car args))))
        (while (cadr (eshell-do-eval (car eshell-test-body)))
-         (setcar eshell-command-body (eshell-copy-tree (cadr args)))
+         (setcar eshell-command-body
+                  (if (cddr args)
+                      `(progn ,@(eshell-copy-tree (cdr args)))
+                    (eshell-copy-tree (cadr args))))
          (eshell-do-eval (car eshell-command-body) synchronous-p)
          (setcar eshell-command-body nil)
          (setcar eshell-test-body (eshell-copy-tree (car args))))