Improve build and integrate firmware versioning

extra_pre.py

@@ -5,11 +5,12 @@ import sys
 import inspect
 import gzip
 import shutil
+from datetime import datetime
 
 Import("env")
 
 GEN_DIR = 'lib/generated'
-OWN_FILE = "extra_script.py"
+OWN_FILE = "extra_pre.py"
 
 INDEXJS = "index.js"
 INDEXCSS = "index.css"
@@ -118,6 +119,7 @@ def join_files(target, filename, dirlist):
 
 def prebuild(env):
     print("#prebuild running")
+    #versfmt = env.GetProjectOption('versionformat')
 
     # directory for dynamically generated files
     gendir = os.path.join(basePath(), GEN_DIR)
@@ -159,6 +161,29 @@ def prebuild(env):
         content += 'EMBED_GZ_FILE("{}", {}, "{}");\n'.format(*entry)
     write_file_if_changed(os.path.join(gendir, EMBEDDED_INCLUDE), content)  
 
-print("#prescript...")
+    # prepare version information
+    versfmt = env.GetProjectOption('custom_versionformat')
+    if versfmt == 'DEVELOP':
+        print("Develop version style")
+        version = "dev"+datetime.now().strftime("%Y%m%d")
+    else:
+        print("Production version style")
+        version = env.GetProjectOption('custom_version')
+
+    now = datetime.utcnow()
+    env.Append(
+        CPPDEFINES=[
+            ('FWVERSION', version),
+            ("FWBUILDDATE", f"{now:%Y-%m-%d}"),
+            ("FWBUILDTIME", f"{now:%H:%M:%S}"),
+        ]
+    )
+
+print("##prescript...")
 prebuild(env)
 
+ # We are using our custom ESP-IDF firmware descriptor
+env.Append(
+    LINKFLAGS = [ "-u", "custom_app_desc" ]
+)
+