Merge pull request #2449 from Textualize/force-color

Force color

CHANGELOG.md

@@ -5,8 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
 ## [Unreleased]
 
+### Added
+
+- Add support for `FORCE_COLOR` env var https://github.com/Textualize/rich/pull/2449
+
 ### Fixed
 
 - Fix NO_COLOR support on legacy Windows https://github.com/Textualize/rich/pull/2458

rich/console.py

@@ -697,7 +697,12 @@ def __init__(
         self._height = height
 
         self._color_system: Optional[ColorSystem]
-        self._force_terminal = force_terminal
+
+        if force_terminal is not None:
+            self._force_terminal = force_terminal
+        else:
+            self._force_terminal = self._environ.get("FORCE_COLOR") is not None
+
         self._file = file
         self.quiet = quiet
         self.stderr = stderr

tests/test_console.py

@@ -895,3 +895,11 @@ def test_render_lines_height_minus_vertical_pad_is_negative():
 
     # Ensuring that no exception is raised...
     console.render_lines(Padding("hello", pad=(1, 0)), options=options)
+
+
+@mock.patch.dict(os.environ, {"FORCE_COLOR": "anything"})
+def test_force_color():
+    # Even though we use a non-tty file, the presence of FORCE_COLOR env var
+    # means is_terminal returns True.
+    console = Console(file=io.StringIO())
+    assert console.is_terminal