go: add golang's bin dir to PATH (for real this time)

home/neovim/settings.nix

@@ -1,6 +1,11 @@
 { ... }:
 {
   programs.nixvim = {
+    # Has not effect... the workaround is to set neovim as the general default editour with
+    # `programs.neovim.defaultEditor = true` in `system/programs/neovim/default.nix`.
+    #
+    # see https://github.com/nix-community/home-manager/issues/4969 and in particular
+    # https://github.com/nix-community/home-manager/issues/4559.
     defaultEditor = true;
     vimdiffAlias = true;
     enableMan = true;

home/shell/bash.nix

@@ -1,4 +1,9 @@
-{ lib, pkgs, ... }:
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
 let
   inherit (import ./bt-devices.nix { inherit lib pkgs; }) btDevices bluetoothctl;
 
@@ -19,6 +24,23 @@ in
 
     initExtra = ''
       ${builtins.concatStringsSep "\n" btConnFuncs}
+
+      # Add go's bin directory to path
+      #
+      # For the record: doing something like this would be more idiomatic...
+      # ```nix
+      # home.sessionPath = [
+      #  # Add ~/go/bin to $PATH
+      #  "${config.home.homeDirectory}/go/bin"
+      # ];
+      # ```
+      # ... but unfortunately, this doesn't work for reasons, outlined in
+      # https://github.com/nix-community/home-manager/issues/4969 and
+      # https://github.com/nix-community/home-manager/issues/4559, so we're using this workaround
+      # below \o/
+      if [[ ":$PATH:" != *":$HOME/go/bin:"* ]]; then
+        export PATH="$PATH:$HOME/go/bin"
+      fi
     '';
   };
 }

home/shell/fish.nix

@@ -1,4 +1,9 @@
-{ lib, pkgs, ... }:
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
 let
   inherit (import ./bt-devices.nix { inherit lib pkgs; }) btDevices bluetoothctl;
 
@@ -23,6 +28,21 @@ in
       bind \cd delete-char
 
       ${builtins.concatStringsSep "\n" btConnFuncs}
+
+      # Add go's bin directory to path
+      #
+      # For the record: doing something like this would be more idiomatic...
+      # ```nix
+      # home.sessionPath = [
+      #  # Add ~/go/bin to $PATH
+      #  "${config.home.homeDirectory}/go/bin"
+      # ];
+      # ```
+      # ... but unfortunately, this doesn't work for reasons, outlined in
+      # https://github.com/nix-community/home-manager/issues/4969 and
+      # https://github.com/nix-community/home-manager/issues/4559, so we're using this workaround
+      # below \o/
+      fish_add_path ~/go/bin
     '';
   };
 }

home/tools/dev.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, ... }:
+{ pkgs, ... }:
 {
   home.packages = [
     # Git tools
@@ -29,9 +29,4 @@
     pkgs.nvd
     pkgs.nixfmt-tree
   ];
-
-  # Add ~/go/bin to $PATH
-  home.sessionPath = [
-    "${config.home.homeDirectory}/go/bin"
-  ];
 }