From d903e2c8df9dc7b02e1e89d135b961810914005d Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Tue, 18 Feb 2014 17:25:44 +0100
Subject: Add 'geiser-connect-local' to connect over Unix-domain socket.

---
 elisp/geiser-repl.el | 38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

(limited to 'elisp')

diff --git a/elisp/geiser-repl.el b/elisp/geiser-repl.el
index 995bb3b..adc8872 100644
--- a/elisp/geiser-repl.el
+++ b/elisp/geiser-repl.el
@@ -327,10 +327,14 @@ module command as a string")
 
 (defun geiser-repl--save-remote-data (address)
   (setq geiser-repl--address address)
-  (setq header-line-format (and address
-                                (format "Host: %s   Port: %s"
-                                        (geiser-repl--host)
-                                        (geiser-repl--port)))))
+  (setq header-line-format
+	(cond ((consp address)
+	       (format "Host: %s   Port: %s"
+		       (geiser-repl--host)
+		       (geiser-repl--port)))
+	      ((stringp address)
+	       (format "Socket: %s" address))
+	      (t nil))))
 
 (defun geiser-repl--output-filter (txt)
   (geiser-con--connection-update-debugging geiser-repl--connection txt)
@@ -384,10 +388,18 @@ module command as a string")
   (setq comint-prompt-regexp prompt)
   (let* ((name (geiser-repl--repl-name impl))
          (buff (current-buffer))
-         (args (if address (list address)
-                 `(,(geiser-repl--binary impl)
-                   nil
-                   ,@(geiser-repl--arglist impl)))))
+         (args (cond ((consp address) (list address))
+		     ((stringp address) '(()))
+		     (t `(,(geiser-repl--binary impl)
+			  nil
+			  ,@(geiser-repl--arglist impl))))))
+    (when (and address (stringp address))
+      ;; Connect over a Unix-domain socket.
+      (make-network-process :name (buffer-name buff)
+			    :buffer buff
+			    :family 'local
+			    :remote address))
+
     (condition-case err
         (apply 'make-comint-in-buffer `(,name ,buff ,@args))
       (error (insert "Unable to start REPL:\n"
@@ -715,6 +727,16 @@ buffer."
                              (geiser-repl--read-address host port))
     (geiser-repl--maybe-remember-scm-buffer buffer)))
 
+(defun geiser-connect-local (impl &optional socket)
+  "Start a new Geiser REPL connected to a remote Scheme process
+over a Unix-domain socket."
+  (interactive
+   (list (geiser-repl--get-impl "Connect to Scheme implementation: ")))
+  (let ((buffer (current-buffer)))
+    (geiser-repl--start-repl impl
+                             (read-file-name "Socket file name: "))
+    (geiser-repl--maybe-remember-scm-buffer buffer)))
+
 (make-variable-buffer-local
  (defvar geiser-repl--last-scm-buffer nil))
 
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