figments: start building generic command-execution framework

lib/Figments/Command.cpp

@@ -0,0 +1,7 @@
+#include "./Command.h"
+
+void
+doNothing(Args& args, Print& printer)
+{}
+
+Command::Command() : func(doNothing) {}

lib/Figments/Command.h

@@ -0,0 +1,33 @@
+#pragma once
+#include <Arduino.h>
+
+class Args {
+    private:
+      String *str;
+    public:
+      Args(String *str) : str(str) {}
+      String operator[](int pos) {
+        char buf[64];
+        strncpy(buf, str->c_str(), sizeof(buf));
+        char *args = strtok(buf, " ");
+        while (pos > 0 && args != NULL) {
+          args = strtok(NULL, " ");
+          pos--;
+        }
+        if (args == NULL) {
+          return String();
+        }
+        return String(args);
+      }
+};
+
+struct CommandList;
+
+struct Command {
+  using Executor = std::function<void(Args&, Print& output)>;
+  Executor func;
+  const char* name = NULL;
+
+  Command();
+  Command(const char* name, Executor func) : name(name), func(func) {}
+};

lib/Figments/Figment.cpp

@@ -0,0 +1,9 @@
+#include "./Figment.h"
+
+const std::vector<Command> emptyCommands;
+
+const std::vector<Command>&
+Task::commands() const
+{
+  return emptyCommands;
+}

lib/Figments/Figment.h

@@ -2,6 +2,7 @@
 #include <Arduino.h>
 #include <functional>
 #include <ArduinoLog.h>
+#include "./Command.h"
 
 #define F_LIKELY(x) __builtin_expect(!!(x), true)
 #define F_UNLIKELY(x) __builtin_expect(!!(x), false)
@@ -68,6 +69,8 @@ struct Task : public virtual Loopable {
 
     const char* name = "";
     State state = Stopped;
+
+    virtual const std::vector<Command> &commands() const;
 };
 
 /**