Enable colour by default in when running on CI

CHANGES.rst

@@ -44,6 +44,8 @@ Features added
   Patch by Chris Barrick.
 * #13227: Implement the :rst:role:`kbd` role as a ``SphinxRole``.
   Patch by Adam Turner.
+* #13065: Enable colour by default in when running on CI.
+  Patch by Adam Turner.
 
 Bugs fixed
 ----------

sphinx/_cli/util/colour.py

@@ -21,6 +21,8 @@ def terminal_supports_colour() -> bool:
         colorama.just_fix_windows_console()
     if 'FORCE_COLOUR' in os.environ or 'FORCE_COLOR' in os.environ:
         return True
+    if os.environ.get('CI', '') in {'true', '1'}:
+        return True
 
     try:
         if not sys.stdout.isatty():

sphinx/cmd/build.py

@@ -13,11 +13,12 @@
 import sphinx._cli.util.errors
 import sphinx.locale
 from sphinx import __display_version__
+from sphinx._cli.util.colour import terminal_supports_colour
 from sphinx.application import Sphinx
 from sphinx.locale import __
 from sphinx.util._io import TeeStripANSI
 from sphinx.util._pathlib import _StrPath
-from sphinx.util.console import color_terminal, nocolor
+from sphinx.util.console import nocolor
 from sphinx.util.docutils import docutils_namespace, patch_docutils
 from sphinx.util.osutil import ensuredir
 
@@ -326,7 +327,7 @@ def _validate_filenames(
 
 
 def _validate_colour_support(colour: str) -> None:
-    if colour == 'no' or (colour == 'auto' and not color_terminal()):
+    if colour == 'no' or (colour == 'auto' and not terminal_supports_colour()):
         nocolor()
 
 

sphinx/cmd/make_mode.py

@@ -16,9 +16,10 @@
 from typing import TYPE_CHECKING
 
 import sphinx
+from sphinx._cli.util.colour import terminal_supports_colour
 from sphinx.cmd.build import build_main
 from sphinx.util._pathlib import _StrPath
-from sphinx.util.console import blue, bold, color_terminal, nocolor
+from sphinx.util.console import blue, bold, nocolor
 from sphinx.util.osutil import rmtree
 
 if TYPE_CHECKING:
@@ -91,7 +92,7 @@ def build_clean(self) -> int:
         return 0
 
     def build_help(self) -> None:
-        if not color_terminal():
+        if not terminal_supports_colour():
             nocolor()
 
         print(bold('Sphinx v%s' % sphinx.__display_version__))

sphinx/cmd/quickstart.py

@@ -31,8 +31,9 @@
 
 import sphinx.locale
 from sphinx import __display_version__, package_dir
+from sphinx._cli.util.colour import terminal_supports_colour
 from sphinx.locale import __
-from sphinx.util.console import bold, color_terminal, colorize, nocolor, red
+from sphinx.util.console import bold, colorize, nocolor, red
 from sphinx.util.osutil import ensuredir
 from sphinx.util.template import SphinxRenderer
 
@@ -724,7 +725,7 @@ def main(argv: Sequence[str] = (), /) -> int:
     locale.setlocale(locale.LC_ALL, '')
     sphinx.locale.init_console()
 
-    if not color_terminal():
+    if not terminal_supports_colour():
         nocolor()
 
     # parse options

sphinx/util/console.py

@@ -2,12 +2,15 @@
 
 from __future__ import annotations
 
-import os
 import re
 import shutil
 import sys
 from typing import TYPE_CHECKING
 
+from sphinx._cli.util.colour import (
+    terminal_supports_colour as color_terminal,  # NoQA: F401
+)
+
 if TYPE_CHECKING:
     from typing import Final
 
@@ -91,24 +94,6 @@ def term_width_line(text: str) -> str:
         return text.ljust(_tw + len(text) - len(strip_escape_sequences(text))) + '\r'
 
 
-def color_terminal() -> bool:
-    if 'NO_COLOR' in os.environ:
-        return False
-    if sys.platform == 'win32' and COLORAMA_AVAILABLE:
-        colorama.just_fix_windows_console()
-        return True
-    if 'FORCE_COLOR' in os.environ:
-        return True
-    if not hasattr(sys.stdout, 'isatty'):
-        return False
-    if not sys.stdout.isatty():
-        return False
-    if 'COLORTERM' in os.environ:
-        return True
-    term = os.environ.get('TERM', 'dumb').lower()
-    return term in {'xterm', 'linux'} or 'color' in term
-
-
 def nocolor() -> None:
     if sys.platform == 'win32' and COLORAMA_AVAILABLE:
         colorama.deinit()

sphinx/util/display.py

@@ -2,9 +2,10 @@
 
 import functools
 
+from sphinx._cli.util.colour import terminal_supports_colour
 from sphinx.locale import __
 from sphinx.util import logging
-from sphinx.util.console import bold, color_terminal
+from sphinx.util.console import bold
 
 if False:
     from collections.abc import Callable, Iterable, Iterator
@@ -35,7 +36,7 @@ def status_iterator(
     stringify_func: Callable[[Any], str] = display_chunk,
 ) -> Iterator[T]:
     # printing on a single line requires ANSI control sequences
-    single_line = verbosity < 1 and color_terminal()
+    single_line = verbosity < 1 and terminal_supports_colour()
     bold_summary = bold(summary)
     if length == 0:
         logger.info(bold_summary, nonl=True)