Basic example query of the Telegram Bot API using Scheme

2 files changed, 51 insertions, 0 deletions

diff --git a/bot.scm b/bot.scm
new file mode 100644
index 0000000..62b45a8
--- /dev/null
+++ b/bot.scm
@@ -0,0 +1,24 @@
+(include "telebot.scm")
+(import (prefix telebot telebot:))
+
+(define (assure-list value)
+  (if (list? value)
+    value
+    (list)))
+
+(define (find-pair symbol nodes)
+  (find (lambda (x) (equal? symbol (car x)))
+        (filter pair? nodes)))
+
+(define (resolve-query query tree)
+  (fold-right (lambda (x y) (find-pair x (assure-list y)))
+              tree
+              (reverse query)))
+
+(define token (car (command-line-arguments)))
+
+(print (resolve-query (list 'result 'username)
+                      (telebot:get-me token)))
+
+(pretty-print (resolve-query (list 'result)
+                             (telebot:get-updates token)))
diff --git a/telebot.scm b/telebot.scm
new file mode 100644
index 0000000..6d6792d
--- /dev/null
+++ b/telebot.scm
@@ -0,0 +1,27 @@
+(module telebot (get-me get-updates send-message)
+  (import chicken scheme)
+  (use openssl)
+  (use http-client)
+  (use medea)
+
+  (define api-base "https://api.telegram.org/bot")
+
+  (define (get-query-url token method)
+    (string-append api-base token "/" method))
+
+  (define (get-me token)
+    (with-input-from-request (get-query-url token "getMe")
+                             #f
+                             read-json))
+
+  (define (get-updates token)
+    (with-input-from-request (get-query-url token "getUpdates")
+                             #f
+                             read-json))
+
+  (define (send-message token user message)
+    (with-input-from-request (get-query-url token "sendMessage")
+                             (list (cons 'chat_id user)
+                                   (cons 'text    message))
+                             read-json))
+)