47 lines
2.3 KiB
Nix
47 lines
2.3 KiB
Nix
# Functions to build elisp files to locally configure emcas buffers.
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# See https://github.com/shlevy/nix-buffer
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{ lib, writeText, inherit-local }:
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{
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withPackages = pkgs: let
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extras = map (x: x.emacsBufferSetup pkgs) (builtins.filter (builtins.hasAttr "emacsBufferSetup") pkgs);
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in writeText "dir-locals.el" ''
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(require 'inherit-local "${inherit-local}/share/emacs/site-lisp/elpa/inherit-local-${inherit-local.version}/inherit-local.elc")
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; Only set up nixpkgs buffer handling when we have some buffers active
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(defvar nixpkgs--buffer-count 0)
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(when (eq nixpkgs--buffer-count 0)
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; When generating a new temporary buffer (one whose name starts with a space), do inherit-local inheritance and make it a nixpkgs buffer
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(defun nixpkgs--around-generate (orig name)
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(if (eq (aref name 0) ?\s)
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(let ((buf (funcall orig name)))
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(when (inherit-local-inherit-child buf)
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(with-current-buffer buf
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(make-local-variable 'kill-buffer-hook)
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(setq nixpkgs--buffer-count (1+ nixpkgs--buffer-count))
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(add-hook 'kill-buffer-hook 'nixpkgs--decrement-buffer-count)))
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buf)
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(funcall orig name)))
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(advice-add 'generate-new-buffer :around #'nixpkgs--around-generate)
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; When we have no more nixpkgs buffers, tear down the buffer handling
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(defun nixpkgs--decrement-buffer-count ()
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(setq nixpkgs--buffer-count (1- nixpkgs--buffer-count))
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(when (eq nixpkgs--buffer-count 0)
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(advice-remove 'generate-new-buffer #'nixpkgs--around-generate)
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(fmakunbound 'nixpkgs--around-generate)
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(fmakunbound 'nixpkgs--decrement-buffer-count))))
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(setq nixpkgs--buffer-count (1+ nixpkgs--buffer-count))
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(make-local-variable 'kill-buffer-hook)
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(add-hook 'kill-buffer-hook 'nixpkgs--decrement-buffer-count)
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; Add packages to PATH and exec-path
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(make-local-variable 'process-environment)
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(put 'process-environment 'permanent-local t)
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(inherit-local 'process-environment)
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(setenv "PATH" (concat "${lib.makeSearchPath "bin" pkgs}:" (getenv "PATH")))
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(inherit-local-permanent exec-path (append '(${builtins.concatStringsSep " " (map (p: "\"${p}/bin\"") pkgs)}) exec-path))
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${lib.concatStringsSep "\n" extras}
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'';
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}
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