Feature: Add capability to build multiple files.

src/command.h

@@ -2,11 +2,22 @@
 #define COMMAND_H
 
 #include "string.h"
+#include "common.h"
 
 typedef struct Arena Arena;
 typedef struct Discovery Discovery;
 typedef struct Configuration Configuration;
 
+struct CommandOptions
+{
+  Arena* a;
+  StringPool* sp;
+  BuildProfile bp;
+  Configuration* c;
+  StringView app;
+  StringView* files;
+};
+
 struct Command
 {
   Arena* a;
@@ -16,8 +27,9 @@ struct Command
 
 typedef struct Argument Argument;
 typedef struct Command Command;
+typedef struct CommandOptions CommandOptions;
 
-Command command_create(Arena* a, Discovery* d, Configuration* c);
+Command command_create_f_to_o(CommandOptions* co);
 
 int command_run(Command* cmd);