From df1c3f1f62769e31605d6635f465b1d03d38b6af Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Mon, 11 May 2020 18:45:31 -0700
Subject: Add 'tag' index page and navbar

---
 z.scm | 55 ++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 17 deletions(-)

diff --git a/z.scm b/z.scm
index 1285126..6d203fa 100644
--- a/z.scm
+++ b/z.scm
@@ -45,13 +45,6 @@
 
 (define *zdir* (os.path.expanduser "~/test-z-wiki"))
 
-(define *about* "\
-# z is a zettelkasten tool
-
-- notes are stored as markdown with metadata
-- filenames serve as the note id's
-")
-
 ;; A node 'id' is a monotonically increasing number.
 
 ;; It can be represented as a string, in which case it is encoded in
@@ -145,6 +138,8 @@
                (/. ids (cons id ids))))))))
 
 (define (reindex)
+  (set! *titles* (dict.empty))
+  (set! *tags* (dict.empty))
   (map index-node (list-nodes)))
 
  ;; Searching / filtering
@@ -171,11 +166,26 @@
 
 (define *css* "body{max-width:650px;margin:40px auto;padding:0 10px;font:18px/1.5 -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, \"Noto Sans\", sans-serif, \"Apple Color Emoji\", \"Segoe UI Emoji\", \"Segoe UI Symbol\", \"Noto Color Emoji\";color:#444}h1,h2,h3{line-height:1.2}@media (prefers-color-scheme: dark){body{color:white;background:#444}a:link{color:#5bf}a:visited{color:#ccf}}")
 
+(define *navbar*
+  (let ((items (lambda ()
+                 (unzip2
+                  '(("index" "/")
+                    #;("new" "/id/new")
+                    ("tags" "/tag"))))))
+    `(nav
+      (ul
+       ,@(call-with-values items
+          (lambda (names paths)
+            (map (lambda (name path)
+               `(li (a (@ (href ,path)) ,name)))
+                 names paths)))))))
+
 (define (template title body)
   `(html (head (title ,title))
          (style ,*css*)
          (body
-          ;; TODO: nav bar
+          (h1 "z")
+          ,*navbar*
           ,@body)))
 
 (define* (respond #:optional body #:key
@@ -206,27 +216,38 @@
   (match (path-components req)
     ['()
      (respond
-      `((h1 "z")
-        (ul
+      `((ul
          ,@(for (list-nodes)
              (lambda (id)
-               `(li (a (@ (href ,(fmt "/id/~a" id)))
+               `(li (a (@ (href ,(fmt "/node/~a" id)))
                        ,(fmt "~a: ~a"
                              id (get-title (read-node id))))))))))]
-    [("id" id)
+    [("node" id)
      (let ([node (read-node (string->id id))])
        (respond `((pre ,node))
                 #:title (fmt "z - ~a" (get-title node))))]
+    [("tag")
+     (let ((tags (dict.keys *tags*)))
+       (reindex)
+       (respond
+        `((ul ,@(for tags
+                  (lambda [tag]
+                    `(li (a (@ (href ,(fmt "/tag/~a" tag)))
+                            ,(fmt "~a" tag)))))))))]
     [("tag" tag)
      (let ([ids (tagged tag)])
-       `((ul ,@(for nodes
-                 `(li (a (@ (href ,(mdt "/id~a" id)))
-                         ,(fmt "~a: ~a"
-                               id (get-title (read-node id)))))))))]
+       (respond
+        `((ul ,@(for ids
+                  (lambda [id]
+                    `(li (a (@ (href ,(fmt "/node/~a" id)))
+                            ,(fmt "~a: ~a"
+                                  id
+                                  (get-title (read-node id)))))))))))]
     [_ (respond "not found")]))
 
 (define* (serve #:key (port 8080))
-  (pr "z server")
+  (prn "z server")
+  (prn (fmt "port ~a" port))
   (http.run-server routes 'http `(#:port ,port)))
 
  ;; CLI
-- 
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