From e3b21ffd6b88008fd1cc3599a0f816773dc11f9d Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jan@jantuomi.fi>
Date: Mon, 22 Apr 2024 21:58:10 +0300
Subject: Refactor whole thing to use in-memory DB as source of truth

---
 md-parser.scm | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 md-parser.scm

(limited to 'md-parser.scm')

diff --git a/md-parser.scm b/md-parser.scm
new file mode 100644
index 0000000..accc927
--- /dev/null
+++ b/md-parser.scm
@@ -0,0 +1,49 @@
+(module md-parser (read-md-frontmatter)
+   (import scheme
+	  (chicken base)
+	  (chicken format)
+	  (chicken file)
+	  (chicken io)
+	  (chicken irregex)
+	  (chicken sort)
+	  srfi-1
+	  srfi-13
+
+	  utils
+	  )
+   
+   (define (collect-fm-lines lines #!optional (acc '()))
+     (if (string=? "---" (car lines))
+	 acc
+	 (collect-fm-lines (cdr lines) (cons (car lines) acc))))
+
+  (define (extract-field field fm) (call/cc (@ extract-field* field fm)))
+  (define (extract-field* field fm return)
+    (define (search line)
+      (define irx (format "^~A: (.+?)$" field))
+      (define m (irregex-search irx line))
+      (if m
+	  (return (submatch m))))
+
+    (for-each search fm)
+    #f)
+
+   (define (parse-line line)
+    (define irx (format "^(.+?): (.+?)$" line))
+    (define m (irregex-search irx line))
+    (if m
+	(cons (submatch m 1) (submatch m 2))
+	#f))
+
+  (define (read-md-frontmatter md-path)
+    (define lines (with-input-from-file md-path
+		    (λ () (read-lines))))
+
+    (define (inner return)
+      (if (not (string=? "---" (car lines)))
+	  (return #f))
+
+      (define fm (collect-fm-lines (cdr lines)))
+      (map parse-line fm))
+
+    (call/cc (@ inner))))
-- 
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