inputs: serial: implement a CLI

src/inputs/Serial.h

@@ -3,14 +3,60 @@
 
 class SerialInput: public InputSource {
 public:
-    void onStart() override {
-        //Serial.begin();
+    SerialInput();
+    InputEvent read() override;
+
+    class LogPrinter : public Print {
+      private:
+        SerialInput* serial;
+        Ringbuf<char, 512> buf;
+      public:
+        LogPrinter(SerialInput* serial) : serial(serial) {};
+        size_t write(uint8_t byte) {
+          if (byte == '\n') {
+            char c;
+            Serial.print('\r');
+            while (buf.take(c)) {
+              Serial.write(c);
+            }
+            Serial.println();
+            serial->redrawPrompt();
+          } else {
+            buf.insert(byte);
+          }
+          return sizeof(byte);
+        }
+    };
+
+    void redrawPrompt();
+
+    Print* logPrinter() {
+        return &m_logPrinter;
     }
 
-    InputEvent read();
+    //static SerialInput::Command *s_root;
+    LogPrinter* printer() {
+      return &m_logPrinter;
+    }
+
+    const std::vector<Command> &commands() const override;
 
 private:
+    enum ParseState {
+      Normal,
+      EscapeSequence,
+      CSI
+    };
     String m_buf;
+    ParseState m_state;
+    char m_escapeSeq[3];
     void doCommand();
+    LogPrinter m_logPrinter;
+    bool m_canRedraw = true;
+    Ringbuf<String, 5> m_history;
+    int m_historyOffset = 0;
 
-}
+    InputEvent parseNormal(char nextChar);
+    InputEvent parseEscape(char nextChar);
+    InputEvent parseCSI(char nextChar);
+};