From dab8d182ee42ac1458ac8c0741231e57198ac85b Mon Sep 17 00:00:00 2001
From: cow <cow@ablecorp.us>
Date: Thu, 22 Dec 2022 01:45:26 -0500
Subject: [PATCH] day 7 progress in common lisp

---
 common-lisp/day-7/example.txt   |   1 +
 common-lisp/day-7/solution.lisp | 115 ++++++++++++++++++++++++++++++++
 input/day-7-example.txt         |  23 +++++++
 3 files changed, 139 insertions(+)
 create mode 120000 common-lisp/day-7/example.txt
 create mode 100755 common-lisp/day-7/solution.lisp
 create mode 100644 input/day-7-example.txt

diff --git a/common-lisp/day-7/example.txt b/common-lisp/day-7/example.txt
new file mode 120000
index 0000000..87c7c28
--- /dev/null
+++ b/common-lisp/day-7/example.txt
@@ -0,0 +1 @@
+../../input/day-7-example.txt
\ No newline at end of file
diff --git a/common-lisp/day-7/solution.lisp b/common-lisp/day-7/solution.lisp
new file mode 100755
index 0000000..d7ef614
--- /dev/null
+++ b/common-lisp/day-7/solution.lisp
@@ -0,0 +1,115 @@
+#!/usr/bin/env -S sbcl --script
+
+(require 'asdf)
+(require 'cl-ppcre)
+(require 'str)
+(require 'iterate)
+(require 'uiop)
+
+(defpackage :solution
+  (:use :cl)
+  (:import-from :iterate :iter)
+  (:import-from :uiop :if-let)
+  (:shadow :directory))
+
+(in-package :solution)
+
+(defclass dir ()
+  ((name
+    :initarg :name
+    :reader name)
+   (parent
+    :initarg :parent
+    :reader parent)
+   (files
+    :initform nil
+    :accessor files)
+   (subdirs
+    :initform nil
+    :accessor subdirs)))
+
+(defun mkdir (dir dirname)
+  (push (cons dirname (make-instance 'dir :name dirname :parent dir)) (subdirs dir)))
+
+(defun touch (dir filename filesize)
+  (push (cons filename filesize) (files dir)))
+
+(defun find-dir (dir dirname)
+  (if-let ((d (assoc dirname (subdirs dir) :test 'string=)))
+    (cdr d)
+    nil))
+
+(defun depth (dir &optional (depth 0))
+  (if-let ((p (parent dir)))
+    (depth p (incf depth))
+    depth))
+
+(defmethod print-object ((obj dir) stream)
+  (format stream
+          "~&name: ~a~%parent: ~a~%depth: ~a~%subdirs: ~a~%files: ~a ~&"
+          (name obj)
+          (if (> (depth obj) 0)
+              (name (parent obj)))
+          (depth obj)
+          (files obj)
+          (subdirs obj)))
+
+(defclass fs ()
+  ((root
+    :initform (make-instance 'dir :name "root" :parent nil)
+    :reader root)
+   (cwd
+    :initform nil
+    :accessor cwd)))
+
+(defvar fs-indent-factor 4)
+
+(defun cd (fs dirname)
+  (with-accessors ((cwd cwd)
+                   (root root))
+      fs
+    (cond ((string= dirname "/")
+           (setf cwd root))
+          ((string= dirname "..")
+           (setf cwd (parent cwd)))
+          (t
+           (setf cwd (find-dir cwd dirname))))))
+
+(defun fs-print-tree (dir stream)
+  (let ((indent (* (depth dir) fs-indent-factor)))
+    (iter (iter:for (filename . filesize) in (files dir))
+      (format stream "~vt - ~a size=~a~%" indent filename filesize))
+    (iter (iter:for (subdirname . subdir) in (subdirs dir))
+      (format stream "~vt / ~a~%" indent subdirname)
+      (fs-print-tree subdir stream))))
+
+(defmethod print-object ((obj fs) stream)
+  (format stream "/ root~%")
+  (fs-print-tree (root obj) stream))
+
+(defun parse-input (lines)
+  (iter (iter:for line in lines)
+    (iter:for parts = (str:split " " line))    
+    (cond ((string= (nth 1 parts) "cd")
+           (iter:collect (list 'cd (nth 2 parts))))
+          ((string= (nth 0 parts) "dir")
+           (iter:collect (list 'dir (nth 1 parts))))
+          ((str:digit? (nth 0 parts))
+           (iter:collect (list 'file (nth 1 parts) (parse-integer (nth 0 parts))))))))
+
+(defun solution-part-1 (events)
+  (iter (iter:with fs = (make-instance 'fs))
+    (iter:for event in events)
+    (let* ((type (car event))
+           (dir-or-file-name (cadr event))
+           (size (if (equal type 'file) (car (last event)) nil)))
+      (with-accessors ((root root)
+                       (cwd cwd))
+          fs
+        (cond ((equal type 'cd)
+               (cd fs dir-or-file-name))
+              ((equal type 'dir)
+               (mkdir cwd dir-or-file-name))
+              ((equal type 'file)
+               (touch cwd dir-or-file-name size))))
+      (iter:finally (return fs)))))
diff --git a/input/day-7-example.txt b/input/day-7-example.txt
new file mode 100644
index 0000000..bcbb513
--- /dev/null
+++ b/input/day-7-example.txt
@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k
\ No newline at end of file