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[Guile-commits] GNU Guile branch, master, updated. release_1-9-0-21-g0d6

From: Andy Wingo
Subject: [Guile-commits] GNU Guile branch, master, updated. release_1-9-0-21-g0d64634
Date: Mon, 22 Jun 2009 20:57:28 +0000

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The branch, master has been updated
       via  0d646345f477f0ffced6f602370fc8c607f7d32f (commit)
      from  b674d4716abe775e648445795f02bece8a3396e0 (commit)

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- Log -----------------------------------------------------------------
commit 0d646345f477f0ffced6f602370fc8c607f7d32f
Author: Andy Wingo <address@hidden>
Date:   Mon Jun 22 22:57:48 2009 +0200

    flush whitespace from the repl input buffer *before* evaluation
    * module/system/repl/repl.scm (start-repl): Given that the input port of
      the repl is line-buffered, it's likely we have #\newline in the input
      that is strictly extraneous, an in-band indicator to the repl that it
      should begin reading now. So flush out that newline, so that you can
      (read-char) at the repl, and it actually does wait for you to type in
      a char instead of just returning #\newline.
      While it's not an overriding concern, this does fix some brainfuck
      programs that want to input from the user.


Summary of changes:
 module/system/repl/repl.scm |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/module/system/repl/repl.scm b/module/system/repl/repl.scm
index 86fb56f..2f4a378 100644
--- a/module/system/repl/repl.scm
+++ b/module/system/repl/repl.scm
@@ -107,6 +107,9 @@
           (set! status '()))
+          ;; since the input port is line-buffered, consume up to the
+          ;; newline
+          (flush-to-newline)
            (catch 'quit
                   (lambda ()
@@ -134,3 +137,14 @@
              ((char-whitespace? ch) (read-char) (next-char wait))
              (else ch)))
+(define (flush-to-newline) 
+  (if (char-ready?)
+      (let ((ch (peek-char)))
+        (if (and (not (eof-object? ch)) (char-whitespace? ch))
+            (begin
+              (read-char)
+              (if (not (char=? ch #\newline))
+                  (flush-to-newline)))))))
\ No newline at end of file

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