Strip ANSI escape sequences when ansi2html is missing

Fixes: #314

pytest_html/plugin.py

@@ -30,6 +30,8 @@ from py.xml import html, raw
 from . import extras
 from . import __version__, __pypi_url__
 
+from _pytest.logging import _remove_ansi_escape_sequences
+
 
 def pytest_addhooks(pluginmanager):
     from . import hooks
@@ -279,9 +281,13 @@ class HTMLReport:
                 header, content = map(escape, section)
                 log.append(f" {header:-^80} ")
                 log.append(html.br())
+
                 if ANSI:
                     converter = Ansi2HTMLConverter(inline=False, escaped=False)
                     content = converter.convert(content, full=False)
+                else:
+                    content = _remove_ansi_escape_sequences(content)
+
                 log.append(raw(content))
                 log.append(html.br())
 

testing/test_pytest_html.py

@@ -830,6 +830,29 @@ class TestHTML:
             else:
                 assert content not in html
 
+    def test_ansi_escape_sequence_removed(self, testdir):
+        testdir.makeini(
+            r"""
+            [pytest]
+            log_cli = 1
+            log_cli_level = INFO
+        """
+        )
+        testdir.makepyfile(
+            r"""
+            import logging
+            logging.basicConfig()
+            LOGGER = logging.getLogger()
+            def test_ansi():
+                LOGGER.info("ANSI removed")
+        """
+        )
+        result, html = run(
+            testdir, "report.html", "--self-contained-html", "--color=yes"
+        )
+        assert result.ret == 0
+        assert not re.search(r"\[[\d;]+m", html)
+
     @pytest.mark.parametrize("content", [("'foo'"), ("u'\u0081'")])
     def test_utf8_longrepr(self, testdir, content):
         testdir.makeconftest(

tox.ini

@@ -24,6 +24,9 @@ commands = pre-commit run --all-files --show-diff-on-failure
 [flake8]
 max-line-length = 88
 exclude = .eggs,.tox
+# rational here:
+# https://github.com/psf/black/blob/master/docs/the_black_code_style.md#slices
+extend-ignore = E203
 
 [pytest]
 testpaths = testing