Emacs: Only enable caching for .emacs.d, better workaround.

.dir-locals.el

@@ -1,4 +0,0 @@
-;;; Directory Local Variables
-;;; For more information see (info "(emacs) Directory Variables")
-
-((nil . ((projectile-enable-caching . t))))

init.d/programming/common.el

@@ -1,6 +1,6 @@
 ;;; common.el --- Common programming settings. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-08-03T01:31:35+0200>
+;; Time-stamp: <2020-08-03T02:56:38+0200>
 
 ;;; Commentary:
 
@@ -106,9 +106,26 @@
                       (substring
                        (shell-command-to-string "nproc --ignore=1") 0 -1)))
 
+            (defun my/projectile-enable-caching? (&rest args)
+              "Turn on caching for certain projects.
+Ignores ARGS."
+              (if (string= (projectile-project-name) ".emacs.d")
+                  (progn
+                    (message "Turning on caching for \"%s\"."
+                             (projectile-project-name))
+                    (setq-local projectile-enable-caching t))
+                (kill-local-variable 'projectile-enable-caching)))
+            (advice-add 'projectile-find-file
+                        :before #'my/projectile-enable-caching?)
+            (advice-add 'counsel-projectile-find-file
+                        :before #'my/projectile-enable-caching?)
+
             (defun my/switch-project ()
               "Find file in project, add project to `treemacs' and
 collapse other projects."
+              ; Enable caching maybe before listing files.
+              (my/projectile-enable-caching?)
+
               (if (member 'counsel-projectile-mode minor-mode-list)
                   (counsel-projectile-find-file)
                 (projectile-find-file))