From 52779888899c967898021f835ede56e8efe3d625 Mon Sep 17 00:00:00 2001
From: Tim Vaughan <tgvaughan@gmail.com>
Date: Thu, 2 May 2019 00:28:52 +0200
Subject: [PATCH] Using (match) to interpret index file entries.

---
 burrow.scm | 59 ++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/burrow.scm b/burrow.scm
index 26814d8..899edae 100644
--- a/burrow.scm
+++ b/burrow.scm
@@ -8,7 +8,7 @@
         (chicken condition)
         (chicken process)
         (chicken process-context)
-        srfi-13)
+        srfi-13 matchable)
 
 (define gopher-index-file-name "index")
 
@@ -51,21 +51,30 @@
       (server-loop))
     (tcp-close listener)))
 
+;;; Selector type inference
 
-;;; Selector retrieval
+(define (has-suffix? selector . suffixes)
+  (if (null? suffixes)
+      #f
+      (if (string-suffix? (car suffixes) selector)
+          #t
+          (apply has-suffix? selector (cdr suffixes)))))
 
-(define (directory-selector? selector)
-  (string-suffix? "/" selector))
+(define (infer-selector-type selector)
+  (let ((l (string-downcase selector)))
+    (cond
+     ((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
+     ((has-suffix? l ".txt" ".org" ".md") 0)
+     ((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
+     (else 9))))
+
+;;; Selector retrieval
 
-(define (text-selector? selector)
-  (apply or (map (lambda (ext) (string-suffix? ext selector))
-                 '(".txt" ".org" ".md"))))
-  
 (define (serve-selector selector config)
-  ((cond
-    ((directory-selector? selector) serve-directory)
-    ((text-selector? seletor) serve-text-file)
-    (else serve-binary-file))
+  ((case (infer-selector-type selector)
+     ((1) serve-directory)
+     ((0) serve-text-file)
+     (else serve-binary-file))
    selector config))
 
 (define (serve-directory path config)
@@ -117,6 +126,26 @@
 (define (serve-info-record info-string)
   (print "i" info-string "\tfake\tfake\t1\r"))
 
+(define (serve-record record path config)
+  (match record
+    ((type display-string selector host port)
+     (print type display-string "\t" selector "\t" host "\t" port "\r"))
+    ((type display-string selector host)
+     (serve-record (list type display-string selector host 70)
+                   path config))
+    ((type display-string selector)
+     (serve-record (list type display-string selector
+                         (server-host config) (server-port config))
+                   path config))
+    ((display-string selector)
+     (serve-record (list (infer-selector-type selector) display-string selector)
+                   path config))
+    ((selector)
+     (serve-record (list (infer-selector-type selector) selector)
+                   path config))
+    (else (error "Unknown record type."))))
+
+
 ;;; main
 
 (define (main)
@@ -135,9 +164,9 @@
               (run-server (make-server-config root hostname port))
               (error "Invalid port argument." port))))))
 
-(main)
+;; (main)
 
-;; (define (test)
-  ;; (run-server (make-server-config "gopher-root" "localhost" 70)))
+(define (test)
+  (run-server (make-server-config "gopher-root" "localhost" 70)))
 
 ;; (test)
-- 
2.20.1