feat(wpcarro/emacs): Add fns to list.el r/4385

new functions:
- duplicate
- last
- delete
- wrap

also:
- drop support for `list-head` (in favor of `list-first`)
- add optional arg to first

Change-Id: If3c48d4749a3bc5a853995996fa02a65a4076a10
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6041
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

1 files changed, 36 insertions, 0 deletions

diff --git a/users/wpcarro/emacs/pkgs/list/tests.el b/users/wpcarro/emacs/pkgs/list/tests.el
index e2fb5788d667..4ee03c6b9792 100644
--- a/users/wpcarro/emacs/pkgs/list/tests.el
+++ b/users/wpcarro/emacs/pkgs/list/tests.el
@@ -65,3 +65,39 @@
   (should (null (list-any? (lambda (x) (= 2 x)) nil)))
   (should (equal t (list-any? (lambda (x) (= 2 x)) '(1 2 3))))
   (should (null (list-any? (lambda (x) (= 4 x)) '(1 2 3)))))
+
+(ert-deftest list-duplicate ()
+  (should (equal '() (list-duplicate 0 "hello")))
+  (should (equal '("hi") (list-duplicate 1 "hi")))
+  (should (equal '("bye" "bye") (list-duplicate 2 "bye")))
+  (should (equal '((1 2) (1 2) (1 2)) (list-duplicate 3 '(1 2)))))
+
+(ert-deftest list-first ()
+  (should (null (list-first '())))
+  (should (equal 1 (list-first '() 1)))
+  (should (equal 1 (list-first '(1))))
+  (should (equal 1 (list-first '(1) 2)))
+  (should (equal 1 (list-first '(1 2 3)))))
+
+(ert-deftest list-last ()
+  (should (null (list-last '())))
+  (should (equal 1 (list-last '() 1)))
+  (should (equal 1 (list-last '(1))))
+  (should (equal 1 (list-last '(1) 2)))
+  (should (equal 3 (list-last '(1 2 3)))))
+
+(ert-deftest list-wrap ()
+  (should (equal '("hello") (list-wrap "hello")))
+  (should (equal '(1 2 3) (list-wrap '(1 2 3))))
+  (should (equal '() (list-wrap nil))))
+
+(ert-deftest list-delete ()
+  (should (equal '(b c) (list-delete 'a '(a b c))))
+  (should (equal '(a b c) (list-delete 'd '(a b c))))
+  (should (equal '(a b c) (list-delete 'b '(a b b c))))
+  (should (equal '() (list-delete 'b '()))))
+
+;; TODO(wpcarro): Supoprt this.
+;; (ert-deftest list-zip ()
+;;   (should (equal '((1 3 5) (2 4 6)) (list-zip '(1 2) '(3 4) '(5 6))))
+;;   (should (equal '((1 3 5)) (list-zip '(1 2) '(3) '(5 6)))))