Enable variable expansion for CSS addons.

src/pytest_html/basereport.py

@@ -9,28 +9,21 @@
 from pathlib import Path
 
 import pytest
-from jinja2 import Environment
-from jinja2 import FileSystemLoader
-from jinja2 import select_autoescape
 
 from pytest_html import __version__
 from pytest_html import extras
 from pytest_html.table import Header
 from pytest_html.table import Row
-from pytest_html.util import _ansi_styles
 from pytest_html.util import cleanup_unserializable
 
 
 class BaseReport:
-    def __init__(self, report_path, config, report_data, default_css="style.css"):
+    def __init__(self, report_path, config, report_data, template, css):
         self._report_path = Path(os.path.expandvars(report_path)).expanduser()
         self._report_path.parent.mkdir(parents=True, exist_ok=True)
-        self._resources_path = Path(__file__).parent.joinpath("resources")
         self._config = config
-        self._template = _read_template([self._resources_path])
-        self._css = _process_css(
-            Path(self._resources_path, default_css), self._config.getoption("css")
-        )
+        self._template = template
+        self._css = css
         self._max_asset_filename_length = int(
             config.getini("max_asset_filename_length")
         )
@@ -224,32 +217,6 @@ def pytest_runtest_logreport(self, report):
             self._generate_report()
 
 
-def _process_css(default_css, extra_css):
-    with open(default_css, encoding="utf-8") as f:
-        css = f.read()
-
-    # Add user-provided CSS
-    for path in extra_css:
-        css += "\n/******************************"
-        css += "\n * CUSTOM CSS"
-        css += f"\n * {path}"
-        css += "\n ******************************/\n\n"
-        with open(path, encoding="utf-8") as f:
-            css += f.read()
-
-    # ANSI support
-    if _ansi_styles:
-        ansi_css = [
-            "\n/******************************",
-            " * ANSI2HTML STYLES",
-            " ******************************/\n",
-        ]
-        ansi_css.extend([str(r) for r in _ansi_styles])
-        css += "\n".join(ansi_css)
-
-    return css
-
-
 def _is_error(report):
     return report.when in ["setup", "teardown"] and report.outcome == "failed"
 
@@ -282,13 +249,3 @@ def _process_outcome(report):
             return "XFailed"
 
     return report.outcome.capitalize()
-
-
-def _read_template(search_paths, template_name="index.jinja2"):
-    env = Environment(
-        loader=FileSystemLoader(search_paths),
-        autoescape=select_autoescape(
-            enabled_extensions=("jinja2",),
-        ),
-    )
-    return env.get_template(template_name)

src/pytest_html/plugin.py

@@ -1,6 +1,7 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import os
 import warnings
 from pathlib import Path
 
@@ -11,6 +12,8 @@
 from pytest_html.report import Report
 from pytest_html.report_data import ReportData
 from pytest_html.selfcontained_report import SelfContainedReport
+from pytest_html.util import _process_css
+from pytest_html.util import _read_template
 
 
 def pytest_addhooks(pluginmanager):
@@ -68,10 +71,14 @@ def pytest_addoption(parser):
 def pytest_configure(config):
     html_path = config.getoption("htmlpath")
     if html_path:
+        extra_css = [
+            Path(os.path.expandvars(css)).expanduser()
+            for css in config.getoption("css")
+        ]
         missing_css_files = []
-        for css_path in config.getoption("css"):
-            if not Path(css_path).exists():
-                missing_css_files.append(css_path)
+        for css_path in extra_css:
+            if not css_path.exists():
+                missing_css_files.append(str(css_path))
 
         if missing_css_files:
             os_error = (
@@ -82,11 +89,17 @@ def pytest_configure(config):
 
         if not hasattr(config, "workerinput"):
             # prevent opening html_path on worker nodes (xdist)
+            resources_path = Path(__file__).parent.joinpath("resources")
+            default_css = Path(resources_path, "style.css")
+            template = _read_template([resources_path])
+            processed_css = _process_css(default_css, extra_css)
             report_data = ReportData(config)
             if config.getoption("self_contained_html"):
-                html = SelfContainedReport(html_path, config, report_data)
+                html = SelfContainedReport(
+                    html_path, config, report_data, template, processed_css
+                )
             else:
-                html = Report(html_path, config, report_data)
+                html = Report(html_path, config, report_data, template, processed_css)
 
             config.pluginmanager.register(html)
 

src/pytest_html/report.py

@@ -10,8 +10,8 @@
 
 
 class Report(BaseReport):
-    def __init__(self, report_path, config, report_data):
-        super().__init__(report_path, config, report_data)
+    def __init__(self, report_path, config, report_data, template, css):
+        super().__init__(report_path, config, report_data, template, css)
         self._assets_path = Path(self._report_path.parent, "assets")
         self._assets_path.mkdir(parents=True, exist_ok=True)
         self._css_path = Path(self._assets_path, "style.css")

src/pytest_html/selfcontained_report.py

@@ -9,8 +9,8 @@
 
 
 class SelfContainedReport(BaseReport):
-    def __init__(self, report_path, config, report_data):
-        super().__init__(report_path, config, report_data)
+    def __init__(self, report_path, config, report_data, template, css):
+        super().__init__(report_path, config, report_data, template, css)
 
     @property
     def css(self):

src/pytest_html/util.py

@@ -6,6 +6,9 @@
 from typing import Any
 from typing import Dict
 
+from jinja2 import Environment
+from jinja2 import FileSystemLoader
+from jinja2 import select_autoescape
 
 try:
     from ansi2html import Ansi2HTMLConverter, style
@@ -30,3 +33,39 @@ def cleanup_unserializable(d: Dict[str, Any]) -> Dict[str, Any]:
             v = str(v)
         result[k] = v
     return result
+
+
+def _read_template(search_paths, template_name="index.jinja2"):
+    env = Environment(
+        loader=FileSystemLoader(search_paths),
+        autoescape=select_autoescape(
+            enabled_extensions=("jinja2",),
+        ),
+    )
+    return env.get_template(template_name)
+
+
+def _process_css(default_css, extra_css):
+    with open(default_css, encoding="utf-8") as f:
+        css = f.read()
+
+    # Add user-provided CSS
+    for path in extra_css:
+        css += "\n/******************************"
+        css += "\n * CUSTOM CSS"
+        css += f"\n * {path}"
+        css += "\n ******************************/\n\n"
+        with open(path, encoding="utf-8") as f:
+            css += f.read()
+
+    # ANSI support
+    if _ansi_styles:
+        ansi_css = [
+            "\n/******************************",
+            " * ANSI2HTML STYLES",
+            " ******************************/\n",
+        ]
+        ansi_css.extend([str(r) for r in _ansi_styles])
+        css += "\n".join(ansi_css)
+
+    return css

testing/test_unit.py

@@ -1,3 +1,11 @@
+import importlib.resources
+import os
+import sys
+
+import pkg_resources
+import pytest
+from assertpy import assert_that
+
 pytest_plugins = ("pytester",)
 
 
@@ -7,6 +15,22 @@ def run(pytester, path="report.html", cmd_flags=None):
     return pytester.runpytest("--html", path, *cmd_flags)
 
 
+def file_content():
+    try:
+        return (
+            importlib.resources.files("pytest_html")
+            .joinpath("assets", "style.css")
+            .read_bytes()
+            .decode("utf-8")
+            .strip()
+        )
+    except AttributeError:
+        # Needed for python < 3.9
+        return pkg_resources.resource_string(
+            "pytest_html", os.path.join("assets", "style.css")
+        ).decode("utf-8")
+
+
 def test_duration_format_deprecation_warning(pytester):
     pytester.makeconftest(
         """
@@ -44,3 +68,67 @@ def pytest_html_results_summary(prefix, summary, postfix, session):
     pytester.makepyfile("def test_pass(): pass")
     result = run(pytester)
     result.assert_outcomes(passed=1)
+
+
+@pytest.fixture
+def css_file_path(pytester):
+    css_one = """
+        h1 {
+          color: red;
+        }
+    """
+    css_two = """
+        h2 {
+          color: blue;
+        }
+    """
+    css_dir = pytester.path / "extra_css"
+    css_dir.mkdir()
+    file_path = css_dir / "one.css"
+    with open(file_path, "w") as f:
+        f.write(css_one)
+
+    pytester.makefile(".css", two=css_two)
+    pytester.makepyfile("def test_pass(): pass")
+
+    return file_path
+
+
+@pytest.fixture(params=[True, False])
+def expandvar(request, css_file_path, monkeypatch):
+    if request.param:
+        monkeypatch.setenv("EXTRA_CSS", str(css_file_path))
+        return "%EXTRA_CSS%" if sys.platform == "win32" else "${EXTRA_CSS}"
+    return css_file_path
+
+
+def test_custom_css(pytester, css_file_path, expandvar):
+    result = run(
+        pytester, "report.html", cmd_flags=["--css", expandvar, "--css", "two.css"]
+    )
+    result.assert_outcomes(passed=1)
+
+    path = pytester.path.joinpath("assets", "style.css")
+
+    with open(str(path)) as f:
+        css = f.read()
+        assert_that(css).contains("* " + str(css_file_path)).contains("* two.css")
+
+
+def test_custom_css_selfcontained(pytester, css_file_path, expandvar):
+    result = run(
+        pytester,
+        "report.html",
+        cmd_flags=[
+            "--css",
+            expandvar,
+            "--css",
+            "two.css",
+            "--self-contained-html",
+        ],
+    )
+    result.assert_outcomes(passed=1)
+
+    with open(pytester.path / "report.html") as f:
+        html = f.read()
+        assert_that(html).contains("* " + str(css_file_path)).contains("* two.css")