From 22b95c42c5b096a3206f80e38b71aac3565ab6b7 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Mon, 11 May 2020 22:13:59 -0700
Subject: Refactor: nodes are now objects

---
 z.scm | 114 ++++++++++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 70 insertions(+), 44 deletions(-)

diff --git a/z.scm b/z.scm
index 6d203fa..e379066 100644
--- a/z.scm
+++ b/z.scm
@@ -2,6 +2,7 @@
 (import (prefix (Alpha String) string.))
 (import (srfi srfi-1))
 (import (sxml simple))
+(import (oop goops))
 (import (only (srfi srfi-19) date->string current-date))
 (import (only (ice-9 match) match))
 (import (prefix (dict) dict.))
@@ -89,47 +90,72 @@
       0
       (apply max ls)))
 
-(define (make-node)
-  (let ([path (-> (list-nodes) latest-node inc id->path)])
-    (call-with-output-file path
-
-      (fn [file]
-          (format file "title:\n")
-          (format file "created: ~a\n"
-                  (date->string (current-date) "~Y.~m.~d..~H.~M"))
-          (format file "tags:\n")
-          (display "---\n" file)))
-    path))
-
-(define (read-node id)
-  (readlines (id->path id)))
-
-(define (cat-node id)
-  (prn (read-node id)))
-
- ;; Metadata
-
-(define (get-title node)
-  (-> node
+(define (next-id)
+   (-> (list-nodes) latest-node inc))
+
+(define-class <node> ()
+  (id #:getter id #:init-keyword #:id)
+  (title #:accessor title #:init-keyword #:title)
+  (created #:getter created
+           #:init-form (date->string (current-date) "~Y.~m.~d..~H.~M"))
+  (tags #:accessor tags #:init-keyword #:tags)
+  (content #:accessor content #:init-keyword #:content)
+  (path #:getter path
+        #:allocation #:virtual
+        #:slot-set! (lambda (_) #f)
+        #:slot-ref (lambda (self)
+                     (id->path (id self)))))
+
+(define-generic save-node!)
+(define-method (save-node! (node <node>))
+  (call-with-output-file (path node)
+    (fn [file]
+        (format file "title: ~a\n" (title node))
+        (format file "created: ~a\n" (created node))
+        (format file "tags: ~{~a ~}" (tags node))
+        (display "---\n" file)
+        (format file "~a" (content node)))))
+
+(define (parse-title node-data)
+  (-> node-data
       (re.match "title: ([^\n]*)")
       (re.group 1)))
 
-(define (get-tags node)
-  (-> node
+(define (parse-tags node-data)
+  (-> node-data
       (re.match "tags: ([^\n]*)")
       (re.group 1)
       (string.split #\space)
       seq))
 
+(define (parse-created node-data)
+  (-> node-data
+      (re.match "created: ([^\n]*)")
+      (re.group 1)))
+
+(define (parse-content node-data)
+  (-> node-data
+      (re.match "---\n(.*)$")
+      (re.group 1)))
+
+(define (load-node id)
+  (let ([data (readlines (id->path id))])
+    (make <node>
+      #:id id
+      #:title (parse-title data)
+      #:created (parse-created data)
+      #:tags (parse-tags data)
+      #:content (parse-content data))))
+
  ;; Indexing
 
 (define *tags* (dict.empty))
 (define *titles* (dict.empty))
 
 (define (index-node id)
-  (let ([node (read-node id)])
-    (dict.set *titles* (get-title node) id)
-    (for (get-tags node)
+  (let ([node (load-node id)])
+    (dict.set *titles* (title node) id)
+    (for (tags node)
       (/. tag
           (if tag
               (dict.update
@@ -157,10 +183,7 @@
   (for (list-nodes)
     (lambda (id)
       (pr id) (pr ": ")
-      (prn (get-title (read-node id))))))
-
-(define (print-node id)
-  (pr (read-node id)))
+      (prn (title (load-node id))))))
 
  ;; webserver
 
@@ -221,11 +244,12 @@
              (lambda (id)
                `(li (a (@ (href ,(fmt "/node/~a" id)))
                        ,(fmt "~a: ~a"
-                             id (get-title (read-node id))))))))))]
+                             id (title (load-node id))))))))))]
     [("node" id)
-     (let ([node (read-node (string->id id))])
-       (respond `((pre ,node))
-                #:title (fmt "z - ~a" (get-title node))))]
+     (let* ([node (load-node (string->id id))]
+            [txt (or (content node) "")])
+       (respond `((pre ,txt))
+                #:title (fmt "z - ~a" (title node))))]
     [("tag")
      (let ((tags (dict.keys *tags*)))
        (reindex)
@@ -242,11 +266,11 @@
                     `(li (a (@ (href ,(fmt "/node/~a" id)))
                             ,(fmt "~a: ~a"
                                   id
-                                  (get-title (read-node id)))))))))))]
+                                  (title (load-node id)))))))))))]
     [_ (respond "not found")]))
 
 (define* (serve #:key (port 8080))
-  (prn "z server")
+  (prn "z")
   (prn (fmt "port ~a" port))
   (http.run-server routes 'http `(#:port ,port)))
 
@@ -264,9 +288,9 @@ where 'command' is:
 (define (main args)
   (match (rest args)
     ['()
-     (let ([path (make-node)]
+     (let ([node (make <node>)]
            [editor (os.getenv "EDITOR")])
-       (subprocess.call (list editor path))
+       (subprocess.call (list editor (path node)))
        (exit EXIT_SUCCESS))]
     [("ls") (print-titles)]
     [("tagged" tag)
@@ -274,11 +298,13 @@ where 'command' is:
        (reindex)
        (for (tagged tag)
          (lambda (id)
-           (let* ([node (read-node id)]
-                  [title (get-title node)])
-             (pr id)
-             (pr ": ")
-             (pr title)))))]
+           (pr id)
+           (pr ": ")
+           (pr (title (load-node id))))))]
+    [("tags")
+     (begin
+       (reindex)
+       (map prn (dict.keys *tags*)))]
     [("web") (serve)]
     [("web" port) (serve #:port (string->number port))]
     [_ (usage)]))
-- 
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