added new terminal formatters using PYTEST_THEME for style

AUTHORS

@@ -308,6 +308,7 @@ Omar Kohl
 Omer Hadari
 Ondřej Súkup
 Oscar Benjamin
+Pandula Gajadeera
 Parth Patel
 Patrick Hayes
 Patrick Lannigan

changelog/11666.improvement.rst

@@ -0,0 +1,5 @@
+Improved the terminal writer to be able to use Terminal256Formatter and TerminalTrueColorFormatter.
+
+These are newer versions of TerminalFormmater from the pygments library that is currently in use.
+
+These style of these formatters are set by the users through the environmental variable PYTEST_THEME.

src/_pytest/_io/terminalwriter.py

@@ -218,13 +218,24 @@ class TerminalWriter:
             return source
         else:
             try:
+                # Import new more rich color formatters from the pygments library
+                from pygments.formatters.terminal256 import TerminalTrueColorFormatter
+                from pygments.formatters.terminal256 import Terminal256Formatter
+
+                # Use terminal formatters depending on user environment variables
+                if os.environ.get('COLORTERM','') in ('truecolor', '24bit'):
+                    # Style determined by user set environment variable, if none then use default style
+                    terminal_formatter = TerminalTrueColorFormatter(style=os.getenv("PYTEST_THEME","default"))
+                elif '256' in os.environ.get('TERM', ''):
+                    terminal_formatter = Terminal256Formatter(style=os.getenv("PYTEST_THEME","default"))
+                else:
+                    terminal_formatter = TerminalFormatter(
+                                            bg=os.getenv("PYTEST_THEME_MODE", "dark"),
+                                            style=os.getenv("PYTEST_THEME"),
+                                            )
                 highlighted: str = highlight(
                     source,
                     Lexer(),
-                    TerminalFormatter(
-                        bg=os.getenv("PYTEST_THEME_MODE", "dark"),
-                        style=os.getenv("PYTEST_THEME"),
-                    ),
                 )
                 # pygments terminal formatter may add a newline when there wasn't one.
                 # We don't want this, remove.