Rework skal to be the shared nix-wrapper module

nix-wrapper/default.nix

@@ -0,0 +1,101 @@
+{ pkgs, lib, config, ... }:
+let
+  flakesPath = config.nix-wrapper.flakesPath;
+
+  nix-wrapper =
+    if flakesPath == "" then
+      throw "'nix-wrapper.flakesPath' cannot be empty"
+   else
+     pkgs.writeShellScriptBin "nix-wrapper" ''
+       URL=`git config --get remote.origin.url`
+       GITHOST=`echo $URL | sed -e s/.*@// | sed -e s/:.*//`
+       GITPATH=`echo $URL | sed -e s/.*:// | sed -e s/.git$//`
+       FLAKE_PATH="${flakesPath}/$GITHOST/$GITPATH"
+
+       usage() {
+          cat << EOF
+Usage:
+  nix-wrapper [options]
+
+Options:
+  -c                create a flake.nix for the current path
+  -e                edit the flake.nix for the current path
+  -a <attribute>    target a specific attribute
+EOF
+        }
+
+       create() {
+         if [ -d "$FLAKE_PATH" ]; then
+           echo "flake.nix already exist at $FLAKE_PATH"
+           exit 1
+         fi
+
+         PWD=$(pwd)
+         echo "Creating flake.nix in '$FLAKE_PATH' using '$PWD' as source path"
+         mkdir -p "$FLAKE_PATH"
+
+         FLAKE="$FLAKE_PATH"/flake.nix
+         cp ${./flake-template.nix} "$FLAKE"
+         chmod 700 "$FLAKE"
+         sed -i -e "s|./SRC_PATH|$PWD|" "$FLAKE"
+
+         ${pkgs.vim}/bin/vim "$FLAKE"
+       }
+
+       edit() {
+         if [ ! -d "$FLAKE_PATH" ]; then
+           echo "no flake.nix exist for '$FLAKE_PATH'"
+           exit 1
+         fi
+
+         ${pkgs.vim}/bin/vim "$FLAKE_PATH/flake.nix"
+       }
+
+       [ "$#" -eq 0 ] && usage && exit 0
+
+       ATTR=""
+       while getopts "cea:" opt; do
+         case "$opt" in
+           c)
+             create
+             exit 0 ;;
+           e)
+             edit
+             exit 0 ;;
+           a)
+             ATTR="$OPTARG" ;;
+         esac
+       done
+
+       shift "$((OPTIND-1))"
+
+       if [ ! -d "$FLAKE_PATH" ]; then
+         echo "no flake.nix exist for '$FLAKE_PATH'"
+         exit 1
+       fi
+
+       [ -n "$ATTR" ] && FLAKE_PATH="$FLAKE_PATH#$ATTR"
+       nix $@ "$FLAKE_PATH"
+     '';
+in
+{
+  options = {
+    nix-wrapper = {
+      flakesPath = lib.mkOption {
+        description = "path to where all flake.nix reside";
+        type = lib.types.str;
+        default = "";
+      };
+    };
+  };
+
+  config = {
+    environment = {
+      shellAliases = {
+        nw = "${nix-wrapper}/bin/nix-wrapper";
+      };
+
+      systemPackages = [ nix-wrapper ];
+    };
+  };
+}

nix-wrapper/flake-template.nix

@@ -0,0 +1,39 @@
+{
+  description = "";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { nixpkgs, ... }:
+    let
+      systems = [ "x86_64-linux" ];
+    in
+      {
+        packages = nixpkgs.lib.genAttrs systems (system:
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+          in
+            {
+              # `derivation` may be filled out or switched
+              # to something like `pkgs.buildGoModule`
+              default = derivation {
+                src = ./SRC_PATH;
+              };
+
+              hello = pkgs.hello;
+            }
+        );
+
+        devShells = nixpkgs.lib.genAttrs systems (system:
+          let
+            pkgs = nixpkgs.legacyPackages.${system};
+          in
+            {
+              default = pkgs.mkShell {
+                packages = [];
+              };
+            }
+        );
+      };
+}