(minibuffer-history-case-insensitive-variables): New var.

(previous-matching-history-element): Implement it.

1 files changed, 16 insertions, 3 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index e025788bb70..96f77b95cd6 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -652,12 +652,21 @@ in this use of the minibuffer.")
 (defun minibuffer-history-initialize ()
   (setq minibuffer-text-before-history nil))
 
+(defcustom minibuffer-history-case-insensitive-variables nil
+  "*Minibuffer history variables for which matching should ignore case.
+If a history variable is a member of this list, then the
+\\[previous-matching-history-element] and \\[next-matching-history-element]\
+ commands ignore case when searching it, regardless of `case-fold-search'."
+  :type '(repeat variable)
+  :group 'minibuffer)
+
 (defun previous-matching-history-element (regexp n)
   "Find the previous history element that matches REGEXP.
 \(Previous history elements refer to earlier actions.)
 With prefix argument N, search for Nth previous match.
 If N is negative, find the next or Nth next match.
-An uppercase letter in REGEXP makes the search case-sensitive."
+An uppercase letter in REGEXP makes the search case-sensitive.
+See also `minibuffer-history-case-insensitive-variables'."
   (interactive
    (let* ((enable-recursive-minibuffers t)
           (regexp (read-from-minibuffer "Previous element matching (regexp): "
@@ -678,8 +687,12 @@ An uppercase letter in REGEXP makes the search case-sensitive."
   (let ((history (symbol-value minibuffer-history-variable))
         (case-fold-search
          (if (isearch-no-upper-case-p regexp t) ; assume isearch.el is dumped
-             ;; Respect the user's setting for case-fold-search:
-             case-fold-search
+             ;; On some systems, ignore case for file names.
+             (if (memq minibuffer-history-variable
+                       minibuffer-history-case-insensitive-variables)
+                 t
+               ;; Respect the user's setting for case-fold-search:
+               case-fold-search)
            nil))
         prevpos
         (pos minibuffer-history-position))