Skeleton of basic functionality, all as TODOs

src/faaso.cr

@@ -1,6 +1,71 @@
+require "commander"
+
 # TODO: Write documentation for `Faaso`
 module Faaso
   VERSION = "0.1.0"
 
-  # TODO: Put your code here
+  module Commands
+    class Build
+      @arguments : Array(String) = [] of String
+      @options : Commander::Options
+
+      def initialize(options, arguments)
+        @options = options
+        @arguments = arguments
+      end
+
+      def run
+        @arguments.each do |arg|
+          puts "Building function... #{arg}"
+          # A function is a folder with stuff in it
+          # TODO: decide template based on file extensions or other metadata
+          # TODO: copy template and add function files to it
+          # TODO: build Docker image
+          # TODO: push Docker image to registry
+          # TODO: return image name for testing
+        end
+      end
+    end
+
+    class Up
+      @arguments : Array(String) = [] of String
+      @options : Commander::Options
+
+      def initialize(options, arguments)
+        @options = options
+        @arguments = arguments
+      end
+
+      def run
+        @arguments.each do |arg|
+          puts "Starting function... #{arg}"
+          # TODO: Check that we have an image for the function
+          # TODO: Start a container with the image
+          # TODO: Run test for healthcheck
+          # TODO: Map route in reverse proxy to function
+          # TODO: Return function URL for testing
+        end
+      end
+    end
+
+    class Down
+      @arguments : Array(String) = [] of String
+      @options : Commander::Options
+
+      def initialize(options, arguments)
+        @options = options
+        @arguments = arguments
+      end
+
+      def run
+        @arguments.each do |arg|
+          puts "Stopping function... #{arg}"
+          # TODO: check if function is running
+          # TODO: stop function container
+          # TODO: delete function container
+          # TODO: remove route from reverse proxy
+        end
+      end
+    end
+  end
 end

src/main.cr

@@ -0,0 +1,36 @@
+require "commander"
+require "./faaso.cr"
+
+cli = Commander::Command.new do |cmd|
+  cmd.use = "faaso"
+  cmd.long = "Functions as a Service, Open"
+
+  cmd.commands.add do |command|
+    command.use = "build"
+    command.short = "Build a function"
+    command.long = "Build a function's Docker image and optionally upload it to registry"
+    command.run do |options, arguments|
+      Faaso::Commands::Build.new(options, arguments).run
+    end
+  end
+
+  cmd.commands.add do |command|
+    command.use = "up"
+    command.short = "Start a function"
+    command.long = "Start a function in a container"
+    command.run do |options, arguments|
+      Faaso::Commands::Up.new(options, arguments).run
+    end
+  end
+
+  cmd.commands.add do |command|
+    command.use = "down"
+    command.short = "Stop a function"
+    command.long = "Stop a function in a container"
+    command.run do |options, arguments|
+      Faaso::Commands::Down.new(options, arguments).run
+    end
+  end
+end
+
+Commander.run(cli, ARGV)