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-rw-r--r--lisp/isearch.el28
1 files changed, 24 insertions, 4 deletions
diff --git a/lisp/isearch.el b/lisp/isearch.el
index 159c9925ba3..13864733804 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -220,6 +220,25 @@ It is nil if none yet.")
Default value, nil, means edit the string instead."
:type 'boolean)
+(defcustom search-default-regexp-mode nil
+ "Default mode to use when starting isearch.
+Value is nil, t, or a function.
+
+If nil, default to literal searches (note that `case-fold-search'
+and `isearch-lax-whitespace' may still be applied).\\<isearch-mode-map>
+If t, default to regexp searches (as if typing `\\[isearch-toggle-regexp]' during
+isearch).
+
+If a function, use that function as an `isearch-regexp-function'.
+Example functions are `word-search-regexp' \(`\\[isearch-toggle-word]'),
+`isearch-symbol-regexp' \(`\\[isearch-toggle-symbol]'), and
+`character-fold-to-regexp' \(`\\[isearch-toggle-character-fold]')."
+ ;; :type is set below by `isearch-specify-regexp-function'.
+ :type '(choice (const :tag "Literal search" nil)
+ (const :tag "Regexp search" t)
+ (function :tag "Other"))
+ :version "25.1")
+
;;; isearch highlight customization.
(defcustom search-highlight t
@@ -827,7 +846,6 @@ See the command `isearch-forward-symbol' for more information."
(autoload 'character-fold-to-regexp "character-fold")
(put 'character-fold-to-regexp 'isearch-message-prefix "char-fold ")
-(defvar character-fold-search)
(defun isearch-mode (forward &optional regexp op-fun recursive-edit regexp-function)
"Start Isearch minor mode.
@@ -850,11 +868,13 @@ used to set the value of `isearch-regexp-function'."
;; Initialize global vars.
(setq isearch-forward forward
- isearch-regexp regexp
+ isearch-regexp (or regexp
+ (and (not regexp-function)
+ (eq search-default-regexp-mode t)))
isearch-regexp-function (or regexp-function
- (and character-fold-search
+ (and (functionp search-default-regexp-mode)
(not regexp)
- 'character-fold-to-regexp))
+ search-default-regexp-mode))
isearch-op-fun op-fun
isearch-last-case-fold-search isearch-case-fold-search
isearch-case-fold-search case-fold-search