From d4db97edda778fbf77cedc89f62184f412f18edf Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Sat, 9 May 2020 22:31:30 -0700
Subject: Add get-tags function

---
 Alpha/String.scm |  7 ++++++-
 re.scm           |  8 ++++++--
 z.scm            | 26 +++++++++++++++-----------
 3 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/Alpha/String.scm b/Alpha/String.scm
index c7ad61f..4e32856 100644
--- a/Alpha/String.scm
+++ b/Alpha/String.scm
@@ -1,5 +1,10 @@
 (define-module (Alpha String)
-  #:export (replace replace-char to-string str capitalize))
+  #:export (replace replace-char to-string str capitalize split))
+
+(define (split s c)
+  (if s
+      (string-split s c)
+      #f))
 
 (define (replace-char s match repl)
   (let ((f (lambda (a b)
diff --git a/re.scm b/re.scm
index b4f3dca..f6f4b75 100644
--- a/re.scm
+++ b/re.scm
@@ -1,7 +1,11 @@
 #!r6rs
 (library (re (0))
-  (export match)
+  (export match group)
   (import (rnrs base (6))
           (ice-9 regex))
   (define (match s pat)
-    (string-match pat s)))
+    (string-match pat s))
+  (define (group m n)
+    (if m
+        (match:substring m n)
+        #f)))
diff --git a/z.scm b/z.scm
index 6e8972a..c318d9a 100644
--- a/z.scm
+++ b/z.scm
@@ -95,7 +95,7 @@
 (define (cat-node id)
   (prn (read-node id)))
 
-;; Indexing
+;; Metadata
 
 (define (get-title id)
   (-> id
@@ -103,17 +103,21 @@
       (re.match "title: ([^\n]*)")
       (match:substring 1)))
 
-(define (index-titles)
-  (fold
-   (lambda (node ls) (acons (get-title node) node ls))
-   '()
-   (list-nodes)))
-
 (define (get-by-title title)
   (let ([index (index-titles)])
     (assoc title index)))
 
-(comment
- (define index-tags)
- (define index-links)
- )
+(define (get-tags id)
+  (-> id
+      read-node
+      (re.match "tags: ([^\n]*)")
+      (re.group 1)
+      (string.split #\space)))
+
+;; Indexing
+
+(define (index-titles)
+  (fold
+   (/. node ls (acons (get-title node) node ls))
+   '()
+   (list-nodes)))
-- 
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