Rework module system. Now modules/commands are defined in a single file each, with both the function executed by teh agent and the definition for server-side argument parsing.

src/modules/manager.nim

@@ -0,0 +1,38 @@
+import tables, strformat
+import ../common/[types, utils]
+
+# Import modules 
+import 
+    shell,
+    sleep,
+    filesystem
+
+type
+    ModuleManager* = object 
+        commandsByType*: Table[CommandType, Command]
+        commandsByName*: Table[string, Command]
+
+var manager: ModuleManager
+
+proc registerCommands(commands: seq[Command]) {.discardable.} = 
+    for cmd in commands: 
+        manager.commandsByType[cmd.commandType] = cmd
+        manager.commandsByName[cmd.name] = cmd
+
+proc loadModules*() = 
+    # Register all imported commands  
+    registerCommands(shell.commands)
+    registerCommands(sleep.commands)
+    registerCommands(filesystem.commands)
+
+proc getCommandByType*(cmdType: CommandType): Command = 
+    return manager.commandsByType[cmdType]
+
+proc getCommandByName*(cmdName: string): Command = 
+    try:
+        return manager.commandsByName[cmdName]
+    except ValueError: 
+        raise newException(ValueError, fmt"The command '{cmdName}' does not exist.")
+
+proc getAvailableCommands*(): Table[string, Command] = 
+    return manager.commandsByName