initial elisp binding

1 files changed, 50 insertions, 0 deletions

diff --git a/lisp/servall-client.el b/lisp/servall-client.el
new file mode 100644
index 0000000..2c6dd17
--- /dev/null
+++ b/lisp/servall-client.el
@@ -0,0 +1,50 @@
+;; -*- lexical-binding: t; -*-
+
+(defvar servall-endpoint "localhost:5555")
+(defvar servall-client-buffer-name "*servall-client*")
+
+(defun servall-api-wikipedia-search (query)
+  (servall-url-fetch-json
+   (concat servall-endpoint "/wikipedia/search/" query)))
+
+(defun servall-api-wikipedia-org (name)
+  (servall-url-fetch-json
+   (concat servall-endpoint "/wikipedia/org/" name)))
+
+(defun servall-parse-http-header (text)
+  (let ((status) (fields))
+    (with-temp-buffer
+      (insert text)
+      (goto-char (point-min))
+      (re-search-forward "^HTTP.*\\([0-9]\\{3\\}\\).*$")
+      (setq status (match-string 1))
+      (while (re-search-forward "^\\(.*?\\): \\(.*\\)$" nil t)
+        (push (cons (intern (match-string 1)) (match-string 2)) fields)))
+    (list (cons 'status status) (cons 'fields fields))))
+
+(defun servall-url-fetch-json (url &optional decompression with-header)
+  (with-current-buffer (get-buffer-create servall-client-buffer-name)
+    (goto-char (point-max))
+    (insert "[" (current-time-string) "] Request: " url "\n"))
+  (with-current-buffer (url-retrieve-synchronously url t)
+    (let ((header) (status) (fields) (json))
+      (delete-http-header)
+      (setq header (servall-parse-http-header (car kill-ring))
+            status (alist-get 'status header)
+            fields (alist-get 'fields header))
+      (with-current-buffer servall-client-buffer-name
+        (insert "[" (current-time-string) "] Response: " status "\n"))
+      (when decompression
+        (call-process-region (point) (point-max) "gunzip" t t t)
+        (goto-char (point-min)))
+      (call-interactively 'delete-trailing-whitespace)
+      (if (string= status "200")
+          (unless (= (point) (point-max))
+            (if with-header
+                (list
+                 (cons 'header fields)
+                 (cons 'json (json-read)))
+              (json-read)))
+        (error "HTTP error: %s" (buffer-substring (point) (point-max)))))))
+
+(provide 'servall-client)