Disable TTY coloring with "PLATFORMIO_DISABLE_COLOR" system environme…

…nt // Resolve #2956

HISTORY.rst

@@ -9,8 +9,9 @@ PlatformIO 4.0
 4.0.3 (2019-??-??)
 ~~~~~~~~~~~~~~~~~~
 
-* Update SCons tool to 3.1.1
+* Support `PLATFORMIO_DISABLE_COLOR <http://docs.platformio.org/en/latest/envvars.html#envvar-PLATFORMIO_DISABLE_COLOR>`__ system environment variable which disables color ANSI-codes in a terminal output (`issue #2956 <https://github.com/platformio/platformio-core/issues/2956>`_)
 * Generate ``.ccls`` LSP file for `Vim <http://docs.platformio.org/en/page/vim.html>`__ cross references, hierarchies, completion and semantic highlighting (`issue #2952 <https://github.com/platformio/platformio-core/issues/2952>`_)
+* Updated SCons tool to 3.1.1
 * Remove ProjectConfig cache when "platformio.ini" was modified outside
 * Fixed an issue with PIO Unified Debugger on Windows OS when debug server is piped
 * Fixed an issue when `--upload-port <http://docs.platformio.org/page/userguide/cmd_run.html#cmdoption-platformio-run-upload-port>`__ CLI flag does not override declared  `upload_port <http://docs.platformio.org/page/projectconf/section_env_upload.html#upload-port>`__ option in `"platformio.ini" (Project Configuration File) <https://docs.platformio.org/page/projectconf.html>`__

platformio/__main__.py

@@ -55,13 +55,15 @@ def configure():
     except (AttributeError, ImportError):
         pass
 
-    # handle PLATFORMIO_FORCE_COLOR
-    if str(os.getenv("PLATFORMIO_FORCE_COLOR", "")).lower() == "true":
-        try:
+    try:
+        if str(os.getenv("PLATFORMIO_DISABLE_COLOR", "")).lower() == "true":
+            # pylint: disable=protected-access
+            click._compat.isatty = lambda stream: False
+        elif str(os.getenv("PLATFORMIO_FORCE_COLOR", "")).lower() == "true":
             # pylint: disable=protected-access
             click._compat.isatty = lambda stream: True
-        except:  # pylint: disable=bare-except
-            pass
+    except:  # pylint: disable=bare-except
+        pass
 
     # Handle IOError issue with VSCode's Terminal (Windows)
     click_echo_origin = [click.echo, click.secho]