Read the input filename from the command line

source.elna

@@ -20,6 +20,9 @@ type
   end,
   FILE = record
     dummy: Int
+  end,
+  CommandLine = record
+    input: pointer to Char
   end;
 
 const
@@ -141,19 +144,6 @@ end;
   End of standard procedures.
 *)
 
-proc test_primitive();
-begin
-  write_s("\nTest primitives:\n");
-  write_u(25u);
-  write_c('\n');
-
-  write_i(8);
-  write_c('\n');
-
-  write_b(true);
-  write_c('\n')
-end;
-
 proc read_source(filename: String): pointer to Char;
 var
   input_file: pointer to FILE,
@@ -677,32 +667,51 @@ begin
   return tokens
 end;
 
-proc command_line(argc: Int, argv: pointer to pointer to Char);
+proc parse_command_line(argc: Int, argv: pointer to pointer to Char): pointer to CommandLine;
 var
   parameter: pointer to pointer to Char,
-  i: Int;
+  i: Int,
+  result: pointer to CommandLine;
 begin
-  write_s("Argument count: ");
-  write_i(argc - 1);
-  write_s("\nArguments:");
+  if argc < 2 then
+    write_s("Fatal error: no input files.\n");
+	return nil
+  end;
+  if argc > 2 then
+    write_s("Fatal error: Unknown command line options:");
 
-  i := 1;
-  while i < argc do
-    parameter := argv + i * cast(sizeof(pointer to Char) as Int);
+    i := 2;
+    while i < argc do
+      parameter := argv + i * cast(sizeof(pointer to Char) as Int);
+ 
+      write_c(' ');
+      write_s(parameter^);
+      i := i + 1
+    end;
+	write_s(".\n");
+	return nil
+  end;
 
-	write_c(' ');
-    write_s(parameter^);
-    i := i + 1
-  end
+  parameter := argv + cast(sizeof(pointer to Char) as Int);
+  result := cast(malloc(sizeof(CommandLine)) as pointer to CommandLine);
+  result^.input := parameter^;
+
+  return result
 end;
 
-proc compile();
+proc process(argc: Int, argv: pointer to pointer to Char): Int;
 var
   input: pointer to Char,
   tokens: pointer to Token,
-  tokens_size: Word;
+  tokens_size: Word,
+  command_line: pointer to CommandLine;
 begin
-  input := read_source("example.elna");
+  command_line := parse_command_line(argc, argv);
+
+  if cast(command_line as Word) = 0u then
+    return 2
+  end;
+  input := read_source(command_line^.input);
   tokens := tokenize(input, @tokens_size);
 
   free(input);
@@ -711,9 +720,5 @@ begin
 end;
 
 begin
-  command_line(count, parameters);
-  compile();
-  test_primitive();
-
-  exit(0)
+  exit(process(count, parameters))
 end.