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Add haskell-interactive-mode-flush-output #1495

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Add haskell-interactive-mode-flush-output #1495

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22 changes: 22 additions & 0 deletions haskell-interactive-mode.el
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Original file line number Diff line number Diff line change
Expand Up @@ -1011,6 +1011,28 @@ don't care when the thing completes as long as it's soonish."
(delete-region (point-min) (point-max)))
(remove-overlays))))

(defun haskell-interactive-mode-flush-output ()
"Delete all output from interpreter since last input.
Does not delete the prompt. This command doesn't handle
multi-line commands."
(interactive)
(let ((session (haskell-interactive-session)))
(with-current-buffer (haskell-session-interactive-buffer session)
(let ((inhibit-read-only t)
(pmark
(save-excursion
(haskell-interactive-mode-prompt-previous)
(forward-line 1) (point)))
(prompt (save-excursion
(search-backward-regexp (haskell-interactive-prompt-regex) nil t))))
(let ((orig (point)))
(goto-char pmark)
(delete-region pmark prompt)
(insert "*** output flushed ***\n")
(forward-line -1)
(put-text-property (point-at-bol) (point-at-eol) 'read-only t)
(goto-char orig))))))

(defun haskell-interactive-mode-completion-at-point-function ()
"Offer completions for partial expression between prompt and point.
This completion function is used in interactive REPL buffer itself."
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