diff --git a/bin/rockspec-generator-cli.lua b/bin/rockspec-generator-cli.lua
index 3e91e48..74fac98 100644
--- a/bin/rockspec-generator-cli.lua
+++ b/bin/rockspec-generator-cli.lua
@@ -1,10 +1,45 @@
 local json = require('dkjson')
 
-json.decode(github_event_data)
+local basename = 'toto'
+local version = '0.1'
+local argparse = require('argparse')
+local parser = argparse([[rockspec-generator", "LuaRocks "..version..", the Lua package manager\n\n
+      ' without any arguments to see the configuration.]])
+  :help_max_width(80)
+  :add_help_command()
+  :add_complete_command({
+    help_max_width = 100,
+    summary = 'Output a shell completion script.',
+    description = [[
+Output a shell completion script.
+
+Enabling completions for Bash:
+
+   Add the following line to your ~/.bashrc:
+      source <(]] .. basename .. [[ completion bash)
+   or save the completion script to the local completion directory:
+      ]] .. basename .. [[ completion bash > ~/.local/share/bash-completion/completions/]] .. basename .. [[
+]],
+  })
+  :command_target('command')
+  :require_command(false)
+
+parser:flag('--version', 'Show version info and exit.'):action(function()
+  print('Program version:', version)
+  os.exit(0)
+end)
+parser:flag('--dev', 'Enable the sub-repositories in rocks servers for ' .. 'rockspecs of in-development versions.')
+parser:option('--template', 'Rockspec-template'):argname('<template>'):hidden_name('--only-sources-from')
+-- :handle_options(false)
+parser:argument('package_name')
+-- :args("*")
+
+args = parser:parse(args)
 
 package_name = arg[0]
 dependencies = arg[1]
-rockspect_template = arg[1]
+rockspect_template = args.template
+-- json.decode(github_event_data)
 
 local rockspec = require('ltr.rockspec').generate(package_name, modrev, specrev, rockspec_template, {
   ref_type = args.ref_type,
diff --git a/flake.nix b/flake.nix
index 67af470..77c8299 100644
--- a/flake.nix
+++ b/flake.nix
@@ -37,6 +37,7 @@
       };
 
       base-dependencies = with pkgs.lua51Packages; [
+        argparse
         dkjson
         luafilesystem
       ];
@@ -93,10 +94,10 @@
         name = "luarocks-tag-release-devShell";
         buildInputs =
           (with pkgs; [
+            base-dependencies
             lua-language-server
             luarocks
             luaPackages.dkjson
-            lua
           ])
           ++ self.checks.${system}.formatting.enabledPackages;
         shellHook = ''