From 556bea4e18dc96d7207692076e66775e8246dc82 Mon Sep 17 00:00:00 2001
From: Colin Okay <cbeok@protonmail.com>
Date: Wed, 12 Aug 2020 17:42:05 -0500
Subject: removed dependency on my stupid lettuce lib

---
 animise.asd  |  2 +-
 animise.lisp | 12 ++++++++----
 easing.lisp  |  2 +-
 package.lisp |  4 +++-
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/animise.asd b/animise.asd
index 401e39c..ab3ca38 100644
--- a/animise.asd
+++ b/animise.asd
@@ -6,7 +6,7 @@
   :license  "AGPLv3.0"
   :version "0.0.1"
   :serial t
-  :depends-on (#:lettuce #:trivia)
+  :depends-on (#:trivia #:alexandria)
   :components ((:file "package")
                (:file "easing")
                (:file "animise")
diff --git a/animise.lisp b/animise.lisp
index 4cb54ac..728ec60 100644
--- a/animise.lisp
+++ b/animise.lisp
@@ -111,6 +111,7 @@
                  :duration duration))
 
 (defun in-sequence (t1 &rest tws)
+  "Run the provided tweens one after the other"
   (let ((seq (make-instance 'tween-seq :tweens (cons t1 tws))))
     (correct-sequencing seq)
     seq))
@@ -118,12 +119,12 @@
 (defun end-time (tween)
   "Some tweens dont have a duration ,and hence never end. NIL is returned to
   reflect this."
-  (let-when (dur (duration tween))
+  (when-let (dur (duration tween))
             (+ (start-time tween) dur)))
 
 (defun tween-finished-p (tween time)
   "Returns T if  TWEEN is done running."
-  (let-when (end (end-time tween))
+  (when-let (end (end-time tween))
             (>= time end)))
 
 (defun add-to-group (group tween &key (offset 0))
@@ -131,13 +132,16 @@
    start time becomes the GROUP'S start time and the OFFSET is ignored.
    Otherwise, TWEEN's start time is set to the start time of the GROUP modified
    by OFFSET."
-  (let-when (start-time (and (members group) (start-time group)))
+  (when-let (start-time (and (members group) (start-time group)))
     (setf (start-time tween)
           (+ offset start-time)))
   (push (members group) tween))
 
 
 (defun as-group (tween &rest tweens)
+  "run the provided tweens in paralell (not actually, but
+   logically). That is, tweens in this group can be updated at the same
+   time."
   (make-instance 'tween-group :members (cons tween tweens)))
 
 ;;; Interface implementations for TWEEN class
@@ -253,7 +257,7 @@
        (on-complete thing)))
 
 (defmethod run-tween ((ob tween-seq) time)
-  (let-when (tween (or
+  (when-let (tween (or
                     ;; find the first unfinished tween in the sequence
                     (find-if-not (lambda (tween)
                                    (when (tween-finished-p tween time)
diff --git a/easing.lisp b/easing.lisp
index ef20a30..d63a4b1 100644
--- a/easing.lisp
+++ b/easing.lisp
@@ -6,7 +6,7 @@
 
 (defun time-frac (start duration current)
   (let* ((end (+ start duration))
-        (progress (max 0 (- end current))))
+         (progress (max 0 (- end current))))
     (- 1.0 (/ progress duration))))
 
 (defmacro def-ease (name &rest body)
diff --git a/package.lisp b/package.lisp
index ae0361f..197b106 100644
--- a/package.lisp
+++ b/package.lisp
@@ -1,8 +1,10 @@
 ;;;; package.lisp
 
 (defpackage #:animise
-  (:use #:cl #:lettuce)
+  (:use #:cl)
   (:import-from #:trivia #:match)
+  (:import-from #:alexandria
+                #:when-let)
   (:export
 
    ;; TWEEN CLASSES
-- 
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