Added prebuild script to auto generate version info based on git hash

* In case git executable is in path, the genVersion.py script will read
  the commit hash and the modification state.

* if git executable is not found a default version is generated

* version tag includes the versin from config.h and combines it with
  git hash, modification state and date & time of build

Author: LIFsCode

eloc610LowPowerPartition/.gitignore

@@ -0,0 +1,9 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+.vscode/*
+
+#ignore auto generated files
+src/version.h

eloc610LowPowerPartition/platformio.ini

@@ -22,3 +22,4 @@ framework =  espidf
 monitor_speed = 115200
 monitor_filters = esp32_exception_decoder
 board_build.partitions = elocPartitions.csv
+extra_scripts = pre:tools/genVersion.py

eloc610LowPowerPartition/src/main.cpp

@@ -30,6 +30,8 @@
 #include "rtc_wdt.h"
 //#include "soc/efuse_reg.h"
 
+#include "version.h"
+
 #include "lis3dh.h"
 #include "ElocSystem.hpp"
 #include "ManualWakeup.hpp"
@@ -604,7 +606,7 @@ void mountSDCard() {
 void app_main(void)
 {
   changeBootPartition(); // so if reboots, always boot into the bluetooth partition
-  ESP_LOGI(TAG, "\n\n---------VERSION %s\n\n", VERSION);
+  ESP_LOGI(TAG, "\n\n---------VERSION %s\n\n", VERSIONTAG);
 
  printRevision();
 

eloc610LowPowerPartition/tools/genVersion.py

@@ -0,0 +1,51 @@
+import os
+import subprocess
+
+FILENAME_VERSION_H = 'src/version.h'
+
+gitFound = False
+try:
+    build_hash = subprocess.run(['git', 'rev-parse', 'HEAD'], stdout=subprocess.PIPE).stdout.decode('utf-8')
+    gitFound = True
+except:
+    print("git not found in path. Please add git to system path variable to be able to use git commit hash in version")
+    build_hash = "UNKNOWN"
+
+if gitFound:
+    subprocess.run(['git', 'update-index', '-q', '--ignore-submodules', '--refresh'], stdout=subprocess.PIPE).stdout.decode('utf-8')
+    # check for unstaged changes in working tree, option -uno checks only tracked files
+    modifiedFiles = subprocess.run(['git', 'status', '--porcelain', '-uno'], stdout=subprocess.PIPE).stdout.decode('utf-8')
+
+print("Build Hash: " + build_hash[:8])
+print(modifiedFiles)
+
+BUILD_CHECKEDIN = ""
+if (len(modifiedFiles) != 0):
+  BUILD_CHECKEDIN = "_MODIFIED"
+
+
+hf = """
+
+// AUTO GENERATED FILE, DO NOT EDIT THIS FILE
+// this file is generated by the genVersion.py prebuild script
+
+#ifndef BUILDINFO_H_
+#define BUILDINFO_H_
+#include "config.h"
+
+#ifndef BUILD_HASH
+  #define BUILD_HASH "{}"
+#endif
+
+#ifndef BUILD_CHECKEDIN
+  #define BUILD_CHECKEDIN "{}"
+#endif
+
+#ifndef VERSIONTAG
+#define VERSIONTAG VERSION "_" BUILD_HASH BUILD_CHECKEDIN " " __DATE__ " " __TIME__""
+#endif
+
+#endif /* BUILDINFO_H_ */
+""".format(build_hash[:8], BUILD_CHECKEDIN)
+with open(FILENAME_VERSION_H, 'w+') as f:
+    f.write(hf)