Initial commit

src/command/parser.cr

@@ -0,0 +1,51 @@
+module CliGenerator::Parser
+
+  macro extended
+    macro define_parser
+      def self.make_parser(parent_parser : OptionParser) : OptionParser
+        {% puts "#{@type.name} OptionParser is being generated" %}
+        {% name = @type.name.split("::").last %}
+        {% var = name.downcase %}
+        {% info = @type.annotation(::CliGenerator::CommandInfo) %}
+        subparser = OptionParser.new do |parser|
+          parser.banner = {{@type.name}}::HEADER
+          {% subcommands = @type.class.methods.select(&.annotation(::CliGenerator::SubCommand)) %}
+          {% if subcommands.size > 0 %}
+            define_section("Subcommands", parser)
+            {% for subcommand in subcommands %}
+              {% subcommand_anno = subcommand.annotation(::CliGenerator::SubCommand) %}
+              parser.on({{subcommand.name.stringify}}, {{subcommand_anno[:description]}}){
+                {{@type.name}}.action= {{subcommand.name.stringify}}
+              }
+            {% end %}
+          {% end %}
+
+          {% arguments =  @type.class.methods.select(&.annotation(::CliGenerator::CommandArgument)) %}
+          {% if arguments.size > 0 %}
+            define_section("Provide Arguments", parser)
+            {% for argument in arguments %}
+              {% argument_anno = argument.annotation(::CliGenerator::CommandArgument) %}
+              {% if argument_anno[:short] == "" &&  argument_anno[:long] != "" %}
+              parser.on({{argument_anno[:long]}}, {{argument_anno[:description]}}){|val|
+              {% elsif argument_anno[:short] != "" &&  argument_anno[:long] == "" %}
+              parser.on({{argument_anno[:short]}}, {{argument_anno[:description]}}){|val|
+              {% else %}
+              parser.on({{argument_anno[:short]}}, {{argument_anno[:long]}}, {{argument_anno[:description]}}){|val|
+              {% end %}
+                {{@type.name}}.{{argument.name}}(val)
+              }
+            {% end %}
+          {% end %}
+          define_default_flags(parser)
+        end
+        parent_parser.on({{var}}, {{info[:description]}}){
+          ARGV.delete({{var}})
+          abort {{var.id}} if ARGV.empty?
+          subparser.parse
+          {{@type.name}}.run
+        }
+      end
+    end
+  end
+
+end