Some option handling

2 files changed, 53 insertions, 4 deletions

diff --git a/src/brainfuck/brainfuck.cr b/src/brainfuck/brainfuck.cr
index 25f3bdf..78c504c 100644
--- a/src/brainfuck/brainfuck.cr
+++ b/src/brainfuck/brainfuck.cr
@@ -1,6 +1,8 @@
 require "./*"
 
 module Brainfuck
+  DEFAULT_TAPE_SIZE = 30_000
+
   enum Opcode
     PtrRight
     PtrLeft
diff --git a/src/flint.cr b/src/flint.cr
index 271c39f..39d8363 100644
--- a/src/flint.cr
+++ b/src/flint.cr
@@ -1,5 +1,7 @@
 # TODO: Write documentation for `Flint`
 
+require "option_parser"
+
 require "./brainfuck/*"
 require "./brainfuck/parser.cr"
 
@@ -7,10 +9,55 @@ module Flint
   VERSION = "0.1.0"
 
   def self.main
-    puts "Hello world!"
-    parser = Brainfuck::Parser.new
-    puts parser
-    puts Brainfuck::Opcode::PtrRight
+    execution_mode = :interpret
+    chosen_language = nil
+    memory_size = nil
+    source_file = nil
+
+    parser = OptionParser.new do |parser|
+      parser.banner = "Basic usage: flint [LANGUAGE] [OPTIONS] [FILE]"
+
+      parser.on("brainfuck", "select brainfuck as the language") do
+        chosen_language = :brainfuck
+        memory_size = Brainfuck::DEFAULT_TAPE_SIZE
+
+        parser.banner = "Useage: flint brainfuck [OPTIONS] [FILE]"
+        parser.on("-t CELLS", "--tape-size=CELLS", "specify the number of memory cells in the tape, defaults to 30,000") { nil }
+      end
+
+      parser.on("-h", "--help", "show this help and exit") do
+        puts parser
+        exit(0)
+      end
+      parser.on("-i", "--interpet", "interpet the provided source code, implied by default, overridden by '-c' or '--compile'") { nil }
+      parser.on("-c", "--compile", "produce a binary or different source code file instead of interpeting the code, overrides an explicit '-i' or '--intepret' flag") do
+        execution_mode = :compile
+      end
+
+      parser.unknown_args do |_args|
+        source_file = _args[0] unless _args.empty?
+      end
+    end
+
+    parser.parse
+
+    if chosen_language.nil?
+      puts "ERROR: No language chosen"
+      puts parser
+      exit(1)
+    end
+
+    if source_file.nil?
+      puts "ERROR: No source file chosen"
+      puts parser
+      exit(1)
+    end
+
+    # temporary
+    puts execution_mode
+    puts chosen_language
+    puts memory_size
+    puts source_file
   end
 end