Fixed an issue when configuration file options partly ignored when `--project-conf` // Resolve #3034 (#3055)

* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve #3034

* Py2 compatible makedirs

* Fix circle dependency

* Fix broken import in test examples

* Fix history

* Remove YAPF markers

* PyLint fix

* Fix invalid project conf path

* Move PIO Core to the root on Windows, issue with long CPPPATHs

* Respect global PLATFORMIO_BUILD_CACHE_DIR env var

* Fix Appveyor paths

* Minor changes

platformio/ide/projectgenerator.py

@@ -23,12 +23,7 @@ from platformio import fs, util
 from platformio.compat import get_file_contents
 from platformio.proc import where_is_program
 from platformio.project.config import ProjectConfig
-from platformio.project.helpers import (
-    get_project_lib_dir,
-    get_project_libdeps_dir,
-    get_project_src_dir,
-    load_project_ide_data,
-)
+from platformio.project.helpers import load_project_ide_data
 
 
 class ProjectGenerator(object):
@@ -76,7 +71,7 @@ class ProjectGenerator(object):
             else where_is_program("platformio"),
             "env_path": os.getenv("PATH"),
             "env_pathsep": os.pathsep,
-        }  # yapf: disable
+        }
 
         # default env configuration
         tpl_vars.update(self.config.items(env=self.env_name, as_dict=True))
@@ -87,13 +82,13 @@ class ProjectGenerator(object):
             tpl_vars.update(
                 {
                     "src_files": self.get_src_files(),
-                    "project_src_dir": get_project_src_dir(),
-                    "project_lib_dir": get_project_lib_dir(),
+                    "project_src_dir": self.config.get_optional_dir("src"),
+                    "project_lib_dir": self.config.get_optional_dir("lib"),
                     "project_libdeps_dir": join(
-                        get_project_libdeps_dir(), self.env_name
+                        self.config.get_optional_dir("libdeps"), self.env_name
                     ),
                 }
-            )  # yapf: disable
+            )
 
         for key, value in tpl_vars.items():
             if key.endswith(("_path", "_dir")):
@@ -109,7 +104,7 @@ class ProjectGenerator(object):
     def get_src_files(self):
         result = []
         with fs.cd(self.project_dir):
-            for root, _, files in os.walk(get_project_src_dir()):
+            for root, _, files in os.walk(self.config.get_optional_dir("src")):
                 for f in files:
                     result.append(relpath(join(root, f)))
         return result