Add support for range objects in Eshell "for" loops

* lisp/eshell/esh-cmd.el (eshell-for-iterate): Add support for
'eshell-range' objects.

* test/lisp/eshell/esh-cmd-tests.el (esh-cmd-test/for-loop-range): New
test.

* doc/misc/eshell.texi (Control Flow): Update documentation.

* etc/NEWS: Announce this change.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/lisp/eshell/esh-cmd-tests.el b/test/lisp/eshell/esh-cmd-tests.el
index ae1aed59b45..64ac3a8c2f6 100644
--- a/test/lisp/eshell/esh-cmd-tests.el
+++ b/test/lisp/eshell/esh-cmd-tests.el
@@ -341,6 +341,21 @@ processes correctly."
     (eshell-match-command-output "for i in `[1 2 3] { echo $i }"
                                  "1\n2\n3\n")))
 
+(ert-deftest esh-cmd-test/for-loop-range ()
+  "Test invocation of a for loop iterating over a range."
+  (with-temp-eshell
+    (eshell-match-command-output "for i in 1..5 { echo $i }"
+                                 "1\n2\n3\n4\n")
+    (let ((eshell-test-value 2))
+      (eshell-match-command-output "for i in $eshell-test-value..5 { echo $i }"
+                                   "2\n3\n4\n"))
+    ;; Make sure range syntax only work when it's part of the literal
+    ;; syntax; a variable expanding to something that looks like a range
+    ;; doesn't count.
+    (let ((eshell-test-value "1..5"))
+      (eshell-match-command-output "for i in $eshell-test-value { echo $i }"
+                                   "1..5\n")))))
+
 (ert-deftest esh-cmd-test/for-loop-mixed-args ()
   "Test invocation of a for loop iterating over multiple arguments."
   (with-temp-eshell