Made main.nim a bit nicer with command-line options

src/main.nim

@@ -2,7 +2,9 @@
 import strformat
 import strutils
 import terminal
+import parseopt
 import os
+
 # Thanks art <3
 import jale/editor as ed
 import jale/templates
@@ -18,6 +20,7 @@ import frontend/parser as p
 import frontend/compiler as c
 import backend/vm as v
 import util/serializer as s
+import config
 
 # Forward declarations
 proc fillSymbolTable(tokenizer: Lexer)
@@ -290,11 +293,54 @@ proc runFile(f: string) =
 
 when isMainModule:
     setControlCHook(proc () {.noconv.} = quit(0))
-    let args = commandLineParams()
-    if args.len() == 0:
+    var optParser = initOptParser(commandLineParams())
+    var file: string = ""
+    var fromString: bool = false
+    var interactive: bool = false
+    for kind, key, value in optParser.getopt():
+        case kind:
+            of cmdArgument:
+                file = key
+            of cmdLongOption:
+                case key:
+                    of "help":
+                        echo HELP_MESSAGE
+                        quit()
+                    of "version":
+                        echo PEON_VERSION_STRING
+                        quit()
+                    of "string":
+                        file = key
+                        fromString = true
+                    of "interactive":
+                        interactive = true
+                    else:
+                        echo &"error: unkown option '{key}'"
+                        quit()
+            of cmdShortOption:
+                case key:
+                    of "h":
+                        echo HELP_MESSAGE
+                        quit()
+                    of "v":
+                        echo PEON_VERSION_STRING
+                        quit()
+                    of "s":
+                        file = key
+                        fromString = true
+                    of "i":
+                        interactive = true
+                    else:
+                        echo &"error: unkown option '{key}'"
+                        quit()
+            else:
+                echo "usage: peon [options] [filename.pn]"
+                quit()
+    # TODO: Use interactive/fromString options
+    if file == "":
         repl()
     else:
-        runFile(args[0])
+        runFile(file)
 
 
 proc fillSymbolTable(tokenizer: Lexer) =