Support TRAMP by spawning remote servers

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### New Features
 
+- Add TRAMP support by spawning one Copilot server per remote host. Remote files are served by a server started on their host (over SSH, inside a container, etc.), which also enables sandboxing the server. A new `copilot-disconnect` command shuts down the server for the current buffer's host. ([#403](https://github.com/copilot-emacs/copilot.el/issues/403))
 - Add experimental Agent mode for Copilot Chat (`copilot-chat-use-agent-mode`). When enabled, Copilot can run client-side tools (`run_in_terminal`, `create_file`, `get_errors`, `fetch_web_page`); each invocation prompts for confirmation unless listed in `copilot-chat-auto-approve-tools`. ([#441](https://github.com/copilot-emacs/copilot.el/issues/441))
 - Add native binary installation support. `copilot-install-server` now falls back to downloading precompiled binaries when npm is unavailable, removing the Node.js requirement on supported platforms. A new `copilot-install-server-native` command is also available for explicit native installation.
 

README.md

@@ -268,6 +268,12 @@ Customization variables:
 - **`copilot-nes-auto-dismiss-move-count`** — cursor movements before auto-dismissing (default `3`)
 - **`copilot-nes-auto-dismiss-distance`** — max lines between point and suggestion before auto-dismissing (default `40`)
 
+### Remote files (TRAMP)
+
+Copilot works in buffers visiting remote files over TRAMP. A separate language server is started on each remote host (over SSH, inside a container, and so on) and used for that host's buffers, while local buffers keep using the local server. This also lets you sandbox the server by running it inside a restricted container.
+
+The server must be installed on the remote host (run `M-x copilot-install-server` from a buffer on that host). `M-x copilot-disconnect` shuts down the server for the current buffer's host.
+
 ### Keybindings
 
 `copilot-mode` does not set any keybindings by default. Use `copilot-completion-map` (active while a completion overlay is visible) to bind keys:

copilot-chat.el

@@ -683,7 +683,7 @@ If not currently streaming, reset the conversation instead."
              (buffer-local-value 'copilot-chat--streaming-p chat-buf))
         (with-current-buffer chat-buf
           (when (and copilot-chat--request-id (copilot--connection-alivep))
-            (jsonrpc-notify copilot--connection
+            (jsonrpc-notify (gethash (copilot--connection-key) copilot--connections)
                             '$/cancelRequest
                             (list :id copilot-chat--request-id)))
           (copilot-chat--end-streaming)

dev/integration-smoke.el

@@ -131,9 +131,7 @@
       (kill-buffer test-buf)))
 
   ;; Shutdown
-  (when copilot--connection
-    (jsonrpc-shutdown copilot--connection)
-    (setq copilot--connection nil))
+  (copilot--shutdown-all-servers)
   (message "\nDone."))
 
 (test--run)

test/copilot-nes-test.el

@@ -107,8 +107,7 @@
                (edit (list :text "new"
                            :range (list :start (list :line 0 :character 0)
                                         :end (list :line 0 :character 5))
-                           :command cmd))
-               (copilot--connection t))
+                           :command cmd)))
           (spy-on 'copilot--connection-alivep :and-return-value t)
           (spy-on 'jsonrpc-notify)
           (copilot-nes--display edit)
@@ -501,8 +500,7 @@
                (edit (list :text "planet"
                            :range (list :start (list :line 0 :character 6)
                                         :end (list :line 0 :character 11))
-                           :command cmd))
-               (copilot--connection t))
+                           :command cmd)))
           (spy-on 'copilot--connection-alivep :and-return-value t)
           (spy-on 'jsonrpc-notify)
           (copilot-nes--display edit)