nixpkgs/pkgs/build-support/emacs/buffer.nix

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# Functions to build elisp files to locally configure emcas buffers.
# See https://github.com/shlevy/nix-buffer
{ lib, writeText }:
{
withPackages = pkgs: let
coqs = builtins.filter (x: (builtins.parseDrvName x.name).name == "coq") pkgs;
coq = builtins.head coqs;
pg-setup = if builtins.length coqs == 0 then "" else ''
(setq-local coq-prog-name "${coq}/bin/coqtop")
(setq-local coq-dependency-analyzer "${coq}/bin/coqdep")
(setq-local coq-compiler "${coq}/bin/coqc")
(setq-local coq-library-directory (get-coq-library-directory))
(coq-prog-args)
'';
in writeText "dir-locals.el" ''
(make-local-variable 'process-environment)
(setenv "PATH" (concat "${lib.makeSearchPath "bin" pkgs}:" (getenv "PATH")))
(setq-local exec-path (append '(${builtins.concatStringsSep " " (map (p: "\"${p}/bin\"") pkgs)}) exec-path))
${pg-setup}
'';
}