bug#54025: 27.2; dired-do-find-regexp skips occurences

[Dmitry Gutov <dgutov@yandex.ru>]

On 21.02.2022 09:00, Петров Андрей wrote:
> I think it is convenient to ask user to save some buffers (like `rgrep' do) if the search algorithm implementation requires all files to be saved. Optionally modified buffers can be skipped with appropriate logging into messages buffer.

How about this?

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index 56897826cb..16094f4551 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -3272,6 +3272,7 @@ dired-do-find-regexp
    (require 'xref)
    (defvar grep-find-ignored-files)
    (declare-function rgrep-find-ignored-directories "grep" (dir))
+  (save-some-buffers)
    (let* ((marks (dired-get-marked-files nil nil nil nil t))
           (ignores (nconc (mapcar
                            #'file-name-as-directory
diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index 880c5b5517..f772871f72 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -834,6 +834,7 @@ project-or-external-find-regexp
       nil)))

  (defun project--find-regexp-in-files (regexp files)
+  (save-some-buffers)
    (unless files
      (user-error "Empty file list"))
    (let ((xrefs (xref-matches-in-files regexp files)))
diff --git a/lisp/progmodes/xref.el b/lisp/progmodes/xref.el
index aa98aa89f1..ae19632974 100644
--- a/lisp/progmodes/xref.el
+++ b/lisp/progmodes/xref.el
@@ -273,6 +273,7 @@ xref-backend-references
  The default implementation uses `semantic-symref-tool-alist' to
  find a search tool; by default, this uses \"find | grep\" in the
  current project's main and external roots."
+  (save-some-buffers)
    (mapcan
     (lambda (dir)
       (message "Searching %s..." dir)
@@ -2013,7 +2014,9 @@ xref--find-file-buffer
      (setq xref--last-file-buffer
            ;; `find-buffer-visiting' is considerably slower,
            ;; especially on remote files.
-          (cons file (get-file-buffer file))))
+          (cons file (get-file-buffer file)))
+    (when (buffer-modified-p (cdr xref--last-file-buffer))
+      (message "Buffer %s has unsaved changes" (cdr 
xref--last-file-buffer))))
    (cdr xref--last-file-buffer))

  (provide 'xref)