pull out lazygit window snippet to a separate package

dotfiles/tmux.nix

@@ -1,7 +1,9 @@
 { pkgs, lib, ... }:
-let tmux-session = pkgs.callPackage ../pkgs/tmux-session { };
+let
+  tmux-session = pkgs.callPackage ../pkgs/tmux-session { };
+  lazygit-window = pkgs.callPackage ../pkgs/lazygit-window { };
 in {
-  home.packages = [ tmux-session ];
+  home.packages = [ tmux-session lazygit-window ];
 
   programs.tmux = {
     enable = true;
@@ -20,7 +22,7 @@ in {
       bind-key -n C-l select-pane -R
 
       # quickly open CLI tools
-      bind h run-shell "tmux switch-client -t :lazygit || tmux new-window -k -n 'lazygit' -c '#{pane_current_path}' ${pkgs.lazygit}/bin/lazygit"
+      bind h run-shell "${lazygit-window}/bin/lazygit-window"
       bind j split-window -h ${tmux-session}/bin/tmux-jump
 
       # get rid of the half-second escape time for kakoune's escape key

dotfiles/zsh.nix

@@ -42,8 +42,6 @@ in {
       RPROMPT=
 
       eval $(${pkgs.thefuck}/bin/thefuck --alias heck)
-
-      alias g=lazygit
     '' + extraInitExtra;
 
     history = {

dotfiles/zsh/git.zsh

@@ -7,3 +7,5 @@ checkout_branch() {
 }
 
 alias co=checkout_branch
+
+alias g=lazygit-window

pkgs/lazygit-window/default.nix

@@ -0,0 +1,17 @@
+{ sources ? import ../../nix/sources.nix, nixpkgs ? import sources.nixpkgs { }
+}:
+with nixpkgs;
+stdenv.mkDerivation {
+  name = "lazygit-window";
+  src = ./.;
+  buildInputs = [ pkgs.makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp ./lazygit-window.sh $out/bin/lazygit-window
+    wrapProgram $out/bin/lazygit-window --prefix PATH : ${
+      pkgs.lib.makeBinPath [ tmux lazygit ]
+    }
+  '';
+}
+

pkgs/lazygit-window/lazygit-window.sh

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+tmux switch-client -t :lazygit >/dev/null 2>&1 || tmux new-window -k -n 'lazygit' -c '#{pane_current_path}' lazygit

pkgs/tmux-session/default.nix

@@ -2,6 +2,8 @@
 }:
 with nixpkgs;
 stdenv.mkDerivation {
+  # inspired by one of Stöffel's keybindings at
+  # https://github.com/stoeffel/.dots/blob/master/tmux/keybindings.conf
   name = "tmux-session";
   src = ./.;
   buildInputs = [ pkgs.makeWrapper ];