add worktree ease for local dev of my modules system

.envrc

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+use flake
+

.gitignore

@@ -1,4 +1,4 @@
 # if in /etc/nixos don't grab defaults
 ./hardware-configuration.nix
 ./configuration.nix
-
+modules/

flake.nix

@@ -63,6 +63,7 @@
     {
       self,
       nypkgs,
+      nixpkgs_stable,
       cosmic,
       lio_nixpkgs,
       lio_home-manager,
@@ -147,6 +148,15 @@
         hostsDir = ./hosts_old;
         usersDir = ./users;
       };
+
+      # Utilities
+      inherit (nixpkgs_stable) lib;
+      # Define the systems to support (all Linux systems exposed by nixpkgs)
+      systems = lib.intersectLists lib.systems.flakeExposed lib.platforms.linux;
+      forAllSystems = lib.genAttrs systems;
+      # Create a mapping from system to corresponding nixpkgs : https://nixos.wiki/wiki/Overlays#In_a_Nix_flake
+      nixpkgsFor = forAllSystems (system: nixpkgs_stable.legacyPackages.${system});
+
     in
     {
       # foldl' is "reduce" where { } is the accumulator and myHosts is the array to reduce on.
@@ -186,5 +196,51 @@
             // nixConfig.opts;
         }
       ) { } myHosts;
+
+      devShells = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgsFor.${system};
+
+          mod_worktrees = pkgs.writeShellScriptBin "mod_worktrees" ''
+            # Get all local and remote mod_* branches, removing lines with '+'
+            branches=$(git branch -a | grep -E 'mod_' | grep -v '^\s*+' | sed 's/^[* ]*//; s/^remotes\/origin\///')
+
+            # Remove duplicates and sort
+            branches=$(echo "$branches" | sort -u)
+
+            for branch in $branches; do
+                # Skip master or other non-mod branches
+                if [[ ! "$branch" =~ ^mod_ ]]; then
+                    continue
+                fi
+
+                # Derive module name (remove mod_ prefix)
+                module_name="''${branch#mod_}"
+                module_path="modules/$module_name"
+
+                # Check if worktree already exists
+                if [ ! -d "$module_path" ]; then
+                    echo "Adding worktree for $branch in $module_path"
+                    git worktree add "$module_path" "$branch" 2>/dev/null
+                # else
+                #     echo "Worktree for $branch already exists"
+                fi
+            done
+          '';
+        in
+        {
+          default = pkgs.mkShell {
+            nativeBuildInputs = [
+              mod_worktrees
+            ];
+
+            shellHook = ''
+              mod_worktrees
+            '';
+          };
+        }
+      );
+
     };
 }

readme.md

@@ -4,6 +4,39 @@
 
 <https://git.joshuabell.xyz/dotfiles/~files/6527f67145fe047df57b4778c154dde580ec04c4>
 
+## Setup local dev
+
+* Get modules in the same directory for ease of development
+```sh
+#!/bin/bash
+
+# Get all local and remote mod_* branches, removing lines with '+'
+branches=$(git branch -a | grep -E 'mod_' | grep -v '^\s*+' | sed 's/^[* ]*//; s/^remotes\/origin\///')
+
+# Remove duplicates and sort
+branches=$(echo "$branches" | sort -u)
+
+for branch in $branches; do
+    # Skip master or other non-mod branches
+    if [[ ! "$branch" =~ ^mod_ ]]; then
+        continue
+    fi
+
+    # Derive module name (remove mod_ prefix)
+    module_name="${branch#mod_}"
+    module_path="modules/$module_name"
+
+    # Check if worktree already exists
+    if [ ! -d "$module_path" ]; then
+        echo "Adding worktree for $branch in $module_path"
+        git worktree add "$module_path" "$branch" 2>/dev/null
+    else
+        echo "Worktree for $branch already exists"
+    fi
+done
+
+```
+
 # First Install on new Machine
 
 ## NixOS install