Update linkwave

* Add parsing of command line arguments, if the first argument starts
  with "http://" assume it's a new bookmark and save it to the
  database.

* Add adding bookmarks to the database.

* linkwave.scm (string-no-null): Only try to remove the final null
  byte if the string is longer than 0 characters and only if the last
  character _is_ a null character.

linkwave.scm

@@ -5,13 +5,38 @@
 
 (: string-no-null (string -> string))
 (define (string-no-null str)
-  (substring str 0 (- (string-length str) 1)))
+  (if (and (> (string-length str) 0)
+           (char=? (string-ref str (- (string-length str) 1)) #\nul))
+      (substring str 0 (- (string-length str) 1))
+      str))
 
 (: print-row (string fixnum string string -> void))
 (define (print-row url seconds name description)
   (format #t "~a~%  ~a~%  ~a~%  ~a~%~%" (string-no-null name) (string-no-null description)
           (string-no-null url) (seconds->string seconds)))
 
+(define (add-bookmark url name description tags)
+  (execute db "INSERT INTO bookmark VALUES (?, STRFTIME('%s'), ?, ?)"
+           url name description)
+  (let ((bookmark-id (last-insert-rowid db)))
+    (for-each (lambda (tag)
+                (let ((tag-id (first-result db "SELECT rowid FROM tag WHERE name = ?" tag)))
+                  (unless tag-id
+                    (execute db "INSERT INTO tag VALUES (?)" tag)
+                    (set! tag-id (last-insert-rowid db)))
+                  (execute db "INSERT INTO bookmark_tag VALUES (?, ?)"
+                           bookmark-id tag-id)))
+              tags)))
+
 (define db (open-database (data-file "linkwave.db")))
+
+(let ((cla (command-line-arguments)))
+  (if (null? cla)
       (for-each-row print-row db "select * from bookmark")
+      (cond
+       ((and (>= (string-length (car cla)) 7) (string= (substring (car cla) 0 7) "http://"))
+        (add-bookmark (car cla) (cadr cla) (caddr cla) (cdddr cla)))
+       (else
+        (format #t "Unrecognized option: ~a~%" (car cla))))))
+
 (finalize! db #t)