78 lines
3.8 KiB
Nix
78 lines
3.8 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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rec {
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withPackages = pkgs': let
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pkgs = builtins.filter (x: x != null) pkgs';
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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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(make-variable-buffer-local 'nixpkgs--is-nixpkgs-buffer)
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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 (and nixpkgs--is-nixpkgs-buffer (eq (aref name 0) ?\s))
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(let ((buf (funcall orig name)))
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(progn
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(inherit-local-inherit-child buf)
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(with-current-buffer buf
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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 nil t)))
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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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(add-hook 'kill-buffer-hook 'nixpkgs--decrement-buffer-count nil t)
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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 modifies in place, so copy the environment first
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(setq process-environment (copy-tree 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: "\"${p}/bin\"") pkgs)}) exec-path))
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(setq nixpkgs--is-nixpkgs-buffer t)
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(inherit-local 'nixpkgs--is-nixpkgs-buffer)
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${lib.concatStringsSep "\n" extras}
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'';
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# nix-buffer function for a project with a bunch of haskell packages
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# in one directory
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haskellMonoRepo = { project-root # The monorepo root
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, haskellPackages # The composed haskell packages set that contains all of the packages
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}: { root }:
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let # The haskell paths.
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haskell-paths = lib.filesystem.haskellPathsInDir project-root;
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# Find the haskell package that the 'root' is in, if any.
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haskell-path-parent =
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let filtered = builtins.filter (name:
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lib.hasPrefix (toString (project-root + "/${name}")) (toString root)
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) (builtins.attrNames haskell-paths);
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in
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if filtered == [] then null else builtins.head filtered;
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# We're in the directory of a haskell package
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is-haskell-package = haskell-path-parent != null;
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haskell-package = haskellPackages.${haskell-path-parent};
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# GHC environment with all needed deps for the haskell package
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haskell-package-env =
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builtins.head haskell-package.env.nativeBuildInputs;
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in
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if is-haskell-package
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then withPackages [ haskell-package-env ]
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else {};
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}
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