From 48ba035aa179c61368e4b0f7e9f87ba69984b2e7 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Sat, 2 Apr 2022 13:15:55 +0100
Subject: =?UTF-8?q?more=20serial=20commands:=20logwipe,=20log=E2=86=92logc?=
 =?UTF-8?q?at?=
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---
 datalog.h | 40 +++++++++++++++++++++++++++++++---------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/datalog.h b/datalog.h
index 73299b5..d68f1b0 100644
--- a/datalog.h
+++ b/datalog.h
@@ -27,26 +27,41 @@ const char csvHeader[]="  secs,  co2,  temp, humid,    pm1,  pm2.5,    pm4,   pm
 const char csvFormat[]="% 6lu, % 4u, % 5.1f, %5.1f, %6.1f, %6.1f, %6.1f, %6.1f, %4.2f\n";
 const size_t lineLength=65;
 
+const char defaultFilename[] = "quality.csv";
+
 class DataLog {
 private:
   File logfile;
+  const char *filename;
   char line[100];
   uint8_t linesSinceLastFlush;
   uint8_t flushThreshold;
-public:
-  DataLog(uint8_t ft=4) : flushThreshold(ft) {}
 
-  void start() {
-    bool sdok=SD.begin(mySD_CS, mySD_MOSI, mySD_MISO, mySD_SCLK);
-    Serial.print("# sdok: ");Serial.println(sdok);
-    logfile = SD.open("quality.csv",FILE_WRITE);
+  void openFile() {
+    logfile = SD.open(filename,FILE_WRITE);
     Serial.print("# file: ");Serial.println(logfile.name());
+
     uint32_t fileSize = logfile.size();
     logfile.seek(fileSize);
+
     if (fileSize == 0) {
       logfile.write((uint8_t*)csvHeader, lineLength);
-    }                    
-    linesSinceLastFlush=1;
+      linesSinceLastFlush=1;
+    }
+    else {
+      linesSinceLastFlush=0;
+    }
+  }
+public:
+  DataLog(uint8_t ft=4, const char *fn=defaultFilename) :
+    filename(fn),
+    flushThreshold(ft)
+  {}
+
+  void start() {
+    bool sdok=SD.begin(mySD_CS, mySD_MOSI, mySD_MISO, mySD_SCLK);
+    Serial.print("# sdok: ");Serial.println(sdok);
+    openFile();
   }
 
   void show(const SensorData *data) {
@@ -78,7 +93,7 @@ public:
   }
 
   bool serialCommand(const String &tag, const String &command) {
-    if (command == "log") {
+    if (command == "logcat") {
       Serial.print(tag);Serial.println(" begin");
 
       uint8_t buffer[1024];
@@ -95,6 +110,13 @@ public:
 
       return true;
     }
+    else if (command == "logwipe") {
+      logfile.close();
+      // ugh, why is it `remove(char*)`??
+      SD.remove(const_cast<char*>(filename));
+      openFile();
+      Serial.print(tag);Serial.println(" wiped");
+    }
 
     return false;
   }
-- 
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