:type 'integer
:group 'comint)
+;; FIXME: this should be defcustom
(defvar comint-input-ring-size 150
"Size of input history ring.")
(define-key map [C-up] 'comint-previous-input)
(define-key map [C-down] 'comint-next-input)
(define-key map "\er" 'comint-previous-matching-input)
+ ;; FIXME: maybe M-r better to be bound to Isearch comint history?
+ ;; (define-key map "\er" 'comint-history-isearch-backward-regexp)
(define-key map "\es" 'comint-next-matching-input)
(define-key map [?\C-c ?\M-r] 'comint-previous-matching-input-from-input)
(define-key map [?\C-c ?\M-s] 'comint-next-matching-input-from-input)
(make-local-variable 'font-lock-defaults)
(setq font-lock-defaults '(nil t))
(add-hook 'change-major-mode-hook 'font-lock-defontify nil t)
+ (add-hook 'isearch-mode-hook 'comint-history-isearch-setup nil t)
;; This behavior is not useful in comint buffers, and is annoying
(set (make-local-variable 'next-line-add-newlines) nil))
(comint-replace-by-expanded-history)
(self-insert-command arg))
\f
+;; Isearch in comint input history
+
+(defcustom comint-history-isearch nil
+ "Non-nil to Isearch in input history only, not in comint buffer output.
+If t, usual Isearch keys like `C-r' and `C-M-r' in comint mode search
+in the input history.
+If `dwim', Isearch keys search in the input history only when initial
+point position is at the comint command line. When starting Isearch
+from other parts of the comint buffer, they search in the comint buffer.
+If nil, Isearch operates on the whole comint buffer."
+ :type '(choice (const :tag "Don't search in input history" nil)
+ (const :tag "When point is on command line initially, search history" dwim)
+ (const :tag "Always search in input history" t))
+ :group 'comint
+ :version "23.2")
+
+(defun comint-history-isearch-backward ()
+ "Search for a string backward in input history using Isearch."
+ (interactive)
+ (let ((comint-history-isearch t))
+ (isearch-backward)))
+
+(defun comint-history-isearch-backward-regexp ()
+ "Search for a regular expression backward in input history using Isearch."
+ (interactive)
+ (let ((comint-history-isearch t))
+ (isearch-backward-regexp)))
+
+(defvar comint-history-isearch-message-overlay nil)
+(make-variable-buffer-local 'comint-history-isearch-message-overlay)
+
+(defun comint-history-isearch-setup ()
+ "Set up a comint for using Isearch to search the input history.
+Intended to be added to `isearch-mode-hook' in `comint-mode'."
+ (when (or (eq comint-history-isearch t)
+ (and (eq comint-history-isearch 'dwim)
+ ;; Point is at command line.
+ (comint-after-pmark-p)))
+ (setq isearch-message-prefix-add "history ")
+ (set (make-local-variable 'isearch-search-fun-function)
+ 'comint-history-isearch-search)
+ (set (make-local-variable 'isearch-message-function)
+ 'comint-history-isearch-message)
+ (set (make-local-variable 'isearch-wrap-function)
+ 'comint-history-isearch-wrap)
+ (set (make-local-variable 'isearch-push-state-function)
+ 'comint-history-isearch-push-state)
+ (add-hook 'isearch-mode-end-hook 'comint-history-isearch-end nil t)))
+
+(defun comint-history-isearch-end ()
+ "Clean up the comint after terminating Isearch in comint."
+ (if comint-history-isearch-message-overlay
+ (delete-overlay comint-history-isearch-message-overlay))
+ (setq isearch-message-prefix-add nil)
+ (setq isearch-search-fun-function nil)
+ (setq isearch-message-function nil)
+ (setq isearch-wrap-function nil)
+ (setq isearch-push-state-function nil)
+ (remove-hook 'isearch-mode-end-hook 'comint-history-isearch-end t))
+
+(defun comint-goto-input (pos)
+ "Put input history item of the absolute history position POS."
+ ;; If leaving the edit line, save partial unfinished input.
+ (if (null comint-input-ring-index)
+ (setq comint-stored-incomplete-input
+ (funcall comint-get-old-input)))
+ (setq comint-input-ring-index pos)
+ (comint-delete-input)
+ (if (and pos (not (ring-empty-p comint-input-ring)))
+ (insert (ring-ref comint-input-ring pos))
+ ;; Restore partial unfinished input.
+ (when (> (length comint-stored-incomplete-input) 0)
+ (insert comint-stored-incomplete-input))))
+
+(defun comint-history-isearch-search ()
+ "Return the proper search function, for Isearch in input history."
+ (cond
+ (isearch-word
+ (if isearch-forward 'word-search-forward 'word-search-backward))
+ (t
+ (lambda (string bound noerror)
+ (let ((search-fun
+ ;; Use standard functions to search within comint text
+ (cond
+ (isearch-regexp
+ (if isearch-forward 're-search-forward 're-search-backward))
+ (t
+ (if isearch-forward 'search-forward 'search-backward))))
+ found)
+ ;; Avoid lazy-highlighting matches in the comint prompt when
+ ;; searching forward. Lazy-highlight calls this lambda with the
+ ;; bound arg, so skip the comint prompt.
+ (if (and bound isearch-forward (< (point) (comint-line-beginning-position)))
+ (goto-char (comint-line-beginning-position)))
+ (or
+ ;; 1. First try searching in the initial comint text
+ (funcall search-fun string
+ (if isearch-forward bound (comint-line-beginning-position))
+ noerror)
+ ;; 2. If the above search fails, start putting next/prev history
+ ;; elements in the comint successively, and search the string
+ ;; in them. Do this only when bound is nil (i.e. not while
+ ;; lazy-highlighting search strings in the current comint text).
+ (unless bound
+ (condition-case nil
+ (progn
+ (while (not found)
+ (cond (isearch-forward
+ ;; Signal an error here explicitly, because
+ ;; `comint-next-input' doesn't signal an error.
+ (when (null comint-input-ring-index)
+ (error "End of history; no next item"))
+ (comint-next-input 1)
+ (goto-char (comint-line-beginning-position)))
+ (t
+ ;; Signal an error here explicitly, because
+ ;; `comint-previous-input' doesn't signal an error.
+ (when (eq comint-input-ring-index
+ (1- (ring-length comint-input-ring)))
+ (error "Beginning of history; no preceding item"))
+ (comint-previous-input 1)
+ (goto-char (point-max))))
+ (setq isearch-barrier (point) isearch-opoint (point))
+ ;; After putting the next/prev history element, search
+ ;; the string in them again, until comint-next-input
+ ;; or comint-previous-input raises an error at the
+ ;; beginning/end of history.
+ (setq found (funcall search-fun string
+ (unless isearch-forward
+ ;; For backward search, don't search
+ ;; in the comint prompt
+ (comint-line-beginning-position))
+ noerror)))
+ ;; Return point of the new search result
+ (point))
+ ;; Return nil on the error "no next/preceding item"
+ (error nil)))))))))
+
+(defun comint-history-isearch-message (&optional c-q-hack ellipsis)
+ "Display the input history search prompt.
+If there are no search errors, this function displays an overlay with
+the Isearch prompt which replaces the original comint prompt.
+Otherwise, it displays the standard Isearch message returned from
+`isearch-message'."
+ (if (not (and isearch-success (not isearch-error)))
+ ;; Use standard function `isearch-message' when not in comint prompt,
+ ;; or search fails, or has an error (like incomplete regexp).
+ ;; This function displays isearch message in the echo area,
+ ;; so it's possible to see what is wrong in the search string.
+ (isearch-message c-q-hack ellipsis)
+ ;; Otherwise, put the overlay with the standard isearch prompt over
+ ;; the initial comint prompt.
+ (if (overlayp comint-history-isearch-message-overlay)
+ (move-overlay comint-history-isearch-message-overlay
+ (save-excursion (forward-line 0) (point))
+ (comint-line-beginning-position))
+ (setq comint-history-isearch-message-overlay
+ (make-overlay (save-excursion (forward-line 0) (point))
+ (comint-line-beginning-position)))
+ (overlay-put comint-history-isearch-message-overlay 'evaporate t))
+ (overlay-put comint-history-isearch-message-overlay
+ 'display (isearch-message-prefix c-q-hack ellipsis))
+ ;; And clear any previous isearch message.
+ (message "")))
+
+(defun comint-history-isearch-wrap ()
+ "Wrap the input history search when search fails.
+Move point to the first history element for a forward search,
+or to the last history element for a backward search."
+ (unless isearch-word
+ ;; When `comint-history-isearch-search' fails on reaching the
+ ;; beginning/end of the history, wrap the search to the first/last
+ ;; input history element.
+ (if isearch-forward
+ (comint-goto-input (1- (ring-length comint-input-ring)))
+ (comint-goto-input nil))
+ (setq isearch-success t))
+ (goto-char (if isearch-forward (comint-line-beginning-position) (point-max))))
+
+(defun comint-history-isearch-push-state ()
+ "Save a function restoring the state of input history search.
+Save `comint-input-ring-index' to the additional state parameter
+in the search status stack."
+ `(lambda (cmd)
+ (comint-history-isearch-pop-state cmd ,comint-input-ring-index)))
+
+(defun comint-history-isearch-pop-state (cmd hist-pos)
+ "Restore the input history search state.
+Go to the history element by the absolute history position HIST-POS."
+ (comint-goto-input hist-pos))
+
+\f
(defun comint-within-quotes (beg end)
"Return t if the number of quotes between BEG and END is odd.
Quotes are single and double."