Add extraBinPackages for adding to $PATH

and use it to make sure Doom's essential prerequisites are available.

README.md

@@ -160,6 +160,9 @@ support use without flakes.
 - `doomSource`: Doom source tree. Defaults to a flake input: overriding that
   input is probably easier than passing this.
 
+- `extraBinPackages`: packages to add to `$PATH`. Defaults to Git, ripgrep and
+  fd.
+
 - `extraPackages`: Specify extra Emacs packages from nixpkgs to be available to
   Doom Emacs. Defaults to this function `epkgs: [ ]` (no extra packages).
   For example to include Emacs package `treesit-grammars.with-all-grammars`:

build-helpers/build-doom-emacs.sh

@@ -22,15 +22,25 @@ else
         --set DOOMPROFILE "$profileName"
     )
 fi
+common=()
+if [[ -n "$binPath" ]]; then
+    common+=(
+        --suffix PATH : "$binPath"
+    )
+fi
+
 makeWrapper $emacsWithPackages/bin/emacs $out/bin/doom-emacs \
     "${profileArgs[@]}" \
+    "${common[@]}" \
     --set DOOMDIR $doomProfile/doomdir \
     --set-default DOOMLOCALDIR "$doomLocalDir" \
     --add-flags "--init-directory=$doomSource"
 makeWrapper $doomSource/bin/doomscript $out/bin/doomscript \
+    "${common[@]}" \
     --set EMACS $emacsWithPackages/bin/emacs \
     --set-default DOOMLOCALDIR "$doomLocalDir"
 makeWrapper $doomSource/bin/doom $out/bin/doom \
+    "${common[@]}" \
     --set EMACS $emacsWithPackages/bin/emacs \
     "${profileArgs[@]}" \
     --set DOOMDIR $doomProfile/doomdir \

default.nix

@@ -40,10 +40,14 @@
   experimentalFetchTree ? false,
   /* Extra emacs packages from nixpkgs */
   extraPackages ? epkgs: [ ],
+  /* Extra packages to add to $PATH */
+  extraBinPackages ? [ git fd ripgrep ],
 
   callPackage,
   callPackages,
+  fd,
   git,
+  ripgrep,
   emacsPackagesFor,
   lib,
   runCommandLocal,
@@ -325,6 +329,7 @@ let
   };
 
   # Step 6: write wrappers to start the whole thing.
+  binPath = lib.makeBinPath extraBinPackages;
 
   # makeBinaryWrapper pulls in a compiler, so don't force this one local.
   doomEmacs = stdenv.mkDerivation {
@@ -332,7 +337,7 @@ let
     buildCommandPath = ./build-helpers/build-doom-emacs.sh;
 
     # emacsWithPackages also accessed externally (for pushing to Cachix).
-    inherit doomProfile doomLocalDir doomSource emacsWithPackages profileName;
+    inherit binPath doomProfile doomLocalDir doomSource emacsWithPackages profileName;
 
     nativeBuildInputs = [ makeBinaryWrapper ];
   };

home-manager.nix

@@ -121,6 +121,17 @@ in {
           Doom cannot specify that package using the '(package! ...)' syntax.
         '';
       };
+      extraBinPackages = mkOption {
+        default = [
+          config.programs.ripgrep.package
+          config.programs.git.package
+          config.programs.fd.package
+        ];
+        type = types.listOf types.package;
+        defaultText = literalExpression
+          "[ programs.ripgrep.package programs.git.package programs.fd.package ]";
+        description = "Extra packages to add to Doom's $PATH.";
+      };
     };
   };