X-Git-Url: https://git.distorted.org.uk/~mdw/profile/blobdiff_plain/84739668640ccafe972a045f8ffbaeef6d4e7d8a..aa6eb0dd5935f5aac2e2cbc251477540e6415229:/dot/lisp-init.lisp

diff --git a/dot/lisp-init.lisp b/dot/lisp-init.lisp
index 3cdcd5e..8b0e3f9 100644
--- a/dot/lisp-init.lisp
+++ b/dot/lisp-init.lisp
@@ -13,6 +13,24 @@
 (setf ext:*gc-verbose* nil
       ext:*require-verbose* nil)
 
+#+ecl
+(let ((old-output *standard-output*)
+      (old-prompt si:*tpl-prompt-hook*))
+  ;; There doesn't seem to be a good way to do this, so we do it the bad
+  ;; way.  Since the herald is printed to `*standard-outout*', we set (not
+  ;; bind!) that to a bit bucket, and then arrange to restore it just before
+  ;; the first REPL prompt is written.
+  ;;
+  ;; One more awful part is that, having intercepted the prompt hook, I need
+  ;; to restore and invoke the old version, and there isn't a clean way to do
+  ;; this.
+  (when (<= (ext:argc) 1)
+    (setf *standard-output* (make-broadcast-stream)
+	  si:*tpl-prompt-hook* (lambda ()
+				 (setf *standard-output* old-output
+				       si:*tpl-prompt-hook* old-prompt)
+				 (si::tpl-prompt)))))
+
 ;; Obtain ASDF from somewhere.
 (require "asdf")
 
@@ -41,6 +59,31 @@
 #+clisp
 (setf custom:*parse-namestring-ansi* t)
 
+;; CLisp history.
+#+(and clisp readline)
+(progn
+  (export '(*history-file* *history-size*))
+  (defvar *history-file* (format nil "~A/.clisp-history" (ext:getenv "HOME"))
+    "File to preserve the REPL history.")
+  (defvar *history-size* 1000)
+  (unless (and (probe-file *history-file*) nil)
+    (let (old-umask stream)
+      ;; Ugh.  There's no proper open(2) veneer.  Play with umask(2) to avoid
+      ;; a window in which an adversary can open the file.
+      (unwind-protect
+	   (setf old-umask (os:umask #o077)
+		 stream (open *history-file*
+			      :direction :output
+			      :if-exists :overwrite
+			      :if-does-not-exist :create))
+	(when stream (close stream))
+	(when old-umask (os:umask old-umask)))))
+  (readline:read-history *history-file*)
+  (if *history-size* (readline:stifle-history *history-size*)
+      (readline:unstifle-history))
+  (push (lambda () (readline:write-history *history-file*))
+	custom:*fini-hooks*))
+
 ;; Shebang.
 (set-dispatch-macro-character
  #\# #\!