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+;;; rust-playpen.el --- Support for the Rust Playground  -*- lexical-binding:t -*-
+;;; Commentary:
+
+;; This library implements support for the Rust Playground,
+;; which is hosted at https://play.rust-lang.org and developed
+;; at https://github.com/integer32llc/rust-playground.
+
+;;; Code:
+
+(eval-when-compile (require 'url))
+
+;;; Options
+
+(defcustom rust-playpen-url-format "https://play.rust-lang.org/?code=%s"
+  "Format string to use when submitting code to the playpen."
+  :type 'string
+  :group 'rust-mode)
+
+(defcustom rust-shortener-url-format "https://is.gd/create.php?format=simple&url=%s"
+  "Format string to use for creating the shortened link of a playpen submission."
+  :type 'string
+  :group 'rust-mode)
+
+;;; Commands
+
+(defun rust-playpen-region (begin end)
+  "Create a shareable URL for the region from BEGIN to END on the Rust playpen."
+  (interactive "r")
+  (let* ((data (buffer-substring begin end))
+         (escaped-data (url-hexify-string data))
+         (escaped-playpen-url (url-hexify-string
+                               (format rust-playpen-url-format escaped-data))))
+    (if (> (length escaped-playpen-url) 5000)
+        (error "encoded playpen data exceeds 5000 character limit (length %s)"
+               (length escaped-playpen-url))
+      (let ((shortener-url (format rust-shortener-url-format escaped-playpen-url))
+            (url-request-method "POST"))
+        (url-retrieve shortener-url
+                      (lambda (state)
+                        ;; filter out the headers etc. included at the
+                        ;; start of the buffer: the relevant text
+                        ;; (shortened url or error message) is exactly
+                        ;; the last line.
+                        (goto-char (point-max))
+                        (let ((last-line (thing-at-point 'line t))
+                              (err (plist-get state :error)))
+                          (kill-buffer)
+                          (if err
+                              (error "failed to shorten playpen url: %s" last-line)
+                            (message "%s" last-line)))))))))
+
+(defun rust-playpen-buffer ()
+  "Create a shareable URL for the contents of the buffer on the Rust playpen."
+  (interactive)
+  (rust-playpen-region (point-min) (point-max)))
+
+;;; _
+(provide 'rust-playpen)
+;;; rust-playpen.el ends here