Add param handling to command router

spec/command_router_spec.cr

@@ -2,13 +2,42 @@ require "./spec_helper"
 require "../src/cli/*"
 
 describe CLI::CommandRouter do
-  it "should handle simple command" do
+  it "should handle simple command as block" do
     router = CLI::CommandRouter.new
     x = 10
-    router.add "plus" do
+    router.add "plus" do |p|
       x += 5
     end
     router.handle "plus"
     x.should eq 15
   end
+
+  it "should handle simple command as proc" do
+    router = CLI::CommandRouter.new
+    x = 10
+    cb = ->(params : Hash(String, String)) { x += 5 }
+    router.add "plus", &cb
+    router.handle "plus"
+    x.should eq 15
+  end
+
+  it "should handle command with argument" do
+    router = CLI::CommandRouter.new
+    x = 10
+    router.add "plus {x}" do |params|
+      x += params["x"].to_i32
+    end
+    router.handle "plus 5"
+    x.should eq 15
+  end
+
+  it "should handle command with three arguments" do
+    router = CLI::CommandRouter.new
+    x = 0
+    router.add "plus {x} {y} {z}" do |p|
+      x = p["x"].to_i32 + p["y"].to_i32 + p["z"].to_i32
+    end
+    router.handle "plus 1 3 6"
+    x.should eq 10
+  end
 end