config: implement commands to change profiles and save settings

src/Config.h

@@ -2,6 +2,7 @@
 #include <Figments.h>
 #include "JsonCoordinateMapping.h"
 #include <ArduinoJson.h>
+#include <LittleFS.h>
 
 class Configuration {
   public:
@@ -59,6 +60,59 @@ struct ConfigService: public Task {
     const char* loadedProfile() const;
     void overrideProfile(const char* profileName);
     const char* getConfigValue(const char* key) const;
+    const std::vector<Command>& commands() const override;
+
+    struct filename_iterator: public std::iterator<std::input_iterator_tag, const char*> {
+      Dir dir;
+      String ret;
+      bool valid;
+      const char* suffix;
+      explicit filename_iterator() : suffix(NULL), valid(false) {}
+      explicit filename_iterator(const char* path, const char* suffix) : dir(LittleFS.openDir(path)), valid(true), suffix(suffix) {
+        next();
+      }
+
+      void next() {
+        if (!valid) {
+          return;
+        }
+        int extPos = -1;
+        do {
+          valid = dir.next();
+          Log.info("valid %F", valid);
+          if (valid) {
+            String fname = dir.fileName();
+            extPos = fname.lastIndexOf(suffix);
+            Log.info("compare %s %d", fname.c_str(), extPos);
+            if (extPos != -1) {
+              ret = fname.substring(0, extPos);
+              Log.info("found %s", ret.c_str());
+            }
+          }
+        } while (valid && extPos == -1);
+      }
+
+      filename_iterator& operator++() {
+        next();
+        return *this;
+      }
+
+      filename_iterator& operator++(int) {filename_iterator ret = *this; ++(*this); return ret;}
+      bool operator==(const filename_iterator &other) const { return valid == other.valid;}
+      bool operator!=(const filename_iterator &other) const { return !(*this == other); }
+      const char* operator*() const {
+        if (!valid) {
+          return NULL;
+        }
+        return ret.c_str();
+      }
+    };
+
+    filename_iterator mapsBegin() const { return filename_iterator("/maps/", ".json"); }
+    filename_iterator mapsEnd() const { return filename_iterator(); }
+
+    filename_iterator profilesBegin() const { return filename_iterator("/profiles/", ".json"); }
+    filename_iterator profilesEnd() const { return filename_iterator(); }
 
 private:
     HardwareConfig m_config;