diff options
Diffstat (limited to 'lisp')
| -rw-r--r-- | lisp/simple.el | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lisp/simple.el b/lisp/simple.el index a757876328b..17697f9be2b 100644 --- a/lisp/simple.el +++ b/lisp/simple.el @@ -8718,6 +8718,21 @@ to capitalize ARG words." (capitalize-region (region-beginning) (region-end)) (capitalize-word arg))) +(defvar external-standard-input-pushback nil + "Pushback character for `external-standard-input'.") + +(defun external-standard-input (&optional char) + "Read a character from the system standard input. + +If CHAR is non-nil, then do not read but return CHAR +on the next invocation." + (if char + (setq external-standard-input-pushback char) + (if (eq nil external-standard-input-pushback) + (external-standard-input-read-char) + (let ((rtn external-standard-input-pushback)) + (setq external-standard-input-pushback nil) + rtn)))) (provide 'simple) |