Direnv

config.org

@@ -77,6 +77,7 @@
 - [[#sudo-edit][SUDO EDIT]]
 - [[#password-store][Password store]]
 - [[#cmake-projects][CMake Projects]]
+- [[#direnv][Direnv]]
 - [[#language-support][Language support]]
   - [[#nix][Nix]]
   - [[#glsl][GLSL]]
@@ -1448,6 +1449,39 @@ Vterm is a terminal emulator within Emacs.  The 'shell-file-name' setting sets t
       (add-to-list 'project-find-functions 'mu-project-try-local)
       )
 #+end_src
+* Direnv
+Loading of environment for the buffers
+#+begin_src emacs-lisp
+  (use-package direnv
+    :ensure t
+    :config
+    (direnv-mode))
+#+end_src
+
+Function to enable it for project
+#+begin_src emacs-lisp
+(defun kylekrein/project-enable-direnv-flake ()
+  "Add `use flake` to .envrc and run `direnv allow` in the project root."
+  (interactive)
+  (let* ((project (project-current t))
+         (root (project-root project))
+         (envrc-path (expand-file-name ".envrc" root)))
+    (unless (file-exists-p envrc-path)
+      (with-temp-buffer
+        (insert "use flake\n")
+        (write-file envrc-path)))
+    (unless (string-match-p "use flake" (with-temp-buffer
+                                          (insert-file-contents envrc-path)
+                                          (buffer-string)))
+      (with-temp-buffer
+        (insert-file-contents envrc-path)
+        (goto-char (point-max))
+        (insert "\nuse flake\n")
+        (write-file envrc-path)))
+    (let ((default-directory root))
+      (shell-command "direnv allow"))
+    (message "Added 'use flake' to .envrc and ran direnv allow in %s" root)))
+#+end_src
 * Language support
 Emacs has built-in programming language modes for Lisp, Scheme, DSSSL, Ada, ASM, AWK, C, C++, Fortran, Icon, IDL (CORBA), IDLWAVE, Java, Javascript, M4, Makefiles, Metafont, Modula2, Object Pascal, Objective-C, Octave, Pascal, Perl, Pike, PostScript, Prolog, Python, Ruby, Simula, SQL, Tcl, Verilog, and VHDL.  Other languages will require you to install additional modes.
 ** Nix