Drop project--value-in-dir

Drop the project--value-in-dir mechanics, where the user could edit
the value in .dir-locals.el and have it applied instantly without
reverting the current buffer.  It made working in remote buffers with
enable-remote-dir-locals non-nil slower, which doesn't seem worth it
for a minor improvement of an infrequent operation.  Also less
compexity overall.

* lisp/progmodes/project.el (project-try-vc, project-files)
(project--vc-list-files, project-ignores, project-buffers):
Use the user options directly.
(project--vc-merge-submodules-p, project--value-in-dir):
Delete functions.

1 files changed, 5 insertions, 17 deletions

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index 0e08dae154b..71061e6139d 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -460,7 +460,7 @@ backend implementation of `project-external-roots'.")
                         (if (and
                              ;; FIXME: Invalidate the cache when the value
                              ;; of this variable changes.
-                             (project--vc-merge-submodules-p root)
+                             project-vc-merge-submodules
                              (project--submodule-p root))
                             (let* ((parent (file-name-directory
                                             (directory-file-name root))))
@@ -512,7 +512,7 @@ backend implementation of `project-external-roots'.")
 (cl-defmethod project-files ((project (head vc)) &optional dirs)
   (mapcan
    (lambda (dir)
-     (let ((ignores (project--value-in-dir 'project-vc-ignores dir))
+     (let ((ignores project-vc-ignores)
            backend)
        (if (and (file-equal-p dir (nth 2 project))
                 (setq backend (cadr project))
@@ -576,7 +576,7 @@ backend implementation of `project-external-roots'.")
               (split-string
                (apply #'vc-git--run-command-string nil "ls-files" args)
                "\0" t)))
-       (when (project--vc-merge-submodules-p default-directory)
+       (when project-vc-merge-submodules
          ;; Unfortunately, 'ls-files --recurse-submodules' conflicts with '-o'.
          (let* ((submodules (project--git-submodules))
                 (sub-files
@@ -610,11 +610,6 @@ backend implementation of `project-external-roots'.")
           (lambda (s) (concat default-directory s))
           (split-string (buffer-string) "\0" t)))))))
 
-(defun project--vc-merge-submodules-p (dir)
-  (project--value-in-dir
-   'project-vc-merge-submodules
-   dir))
-
 (defun project--git-submodules ()
   ;; 'git submodule foreach' is much slower.
   (condition-case nil
@@ -655,7 +650,7 @@ backend implementation of `project-external-roots'.")
          (condition-case nil
              (vc-call-backend backend 'ignore-completion-table root)
            (vc-not-supported () nil)))))
-     (project--value-in-dir 'project-vc-ignores root)
+     project-vc-ignores
      (mapcar
       (lambda (dir)
         (concat dir "/"))
@@ -686,16 +681,9 @@ DIRS must contain directory names."
   ;; Sidestep the issue of expanded/abbreviated file names here.
   (cl-set-difference files dirs :test #'file-in-directory-p))
 
-(defun project--value-in-dir (var dir)
-  (with-temp-buffer
-    (setq default-directory dir)
-    (let ((enable-local-variables :all))
-      (hack-dir-local-variables-non-file-buffer))
-    (symbol-value var)))
-
 (cl-defmethod project-buffers ((project (head vc)))
   (let* ((root (expand-file-name (file-name-as-directory (project-root project))))
-         (modules (unless (or (project--vc-merge-submodules-p root)
+         (modules (unless (or project-vc-merge-submodules
                               (project--submodule-p root))
                     (mapcar
                      (lambda (m) (format "%s%s/" root m))