Allow specifying a run path

Fixes #19

Author: michamos

README.md

@@ -34,5 +34,7 @@ jobs:
 
 If your test is running in a Docker container, you have to install this plugin and manually set `GITHUB_ACTIONS` environment variable to `true` inside of Docker container. (For example, `docker-compose run --rm -e GITHUB_ACTIONS=true app -- pytest`)
 
+If your tests are run from a subdirectory of the git repository, you have to set the `PYTEST_RUN_PATH` environment variable to the path of that directory relative to the repository root in order for GitHub to identify the files with errors correctly.
+
 ## Screenshot
 [![Image from Gyazo](https://i.gyazo.com/b578304465dd1b755ceb0e04692a57d9.png)](https://gyazo.com/b578304465dd1b755ceb0e04692a57d9)

plugin_test.py

@@ -106,6 +106,24 @@ def test_fail():
     )
 
 
+def test_annotation_fail_runpath(testdir):
+    testdir.makepyfile(
+        """
+        import pytest
+        pytest_plugins = 'pytest_github_actions_annotate_failures'
+
+        def test_fail():
+            assert 0
+        """
+    )
+    testdir.monkeypatch.setenv("GITHUB_ACTIONS", "true")
+    testdir.monkeypatch.setenv("PYTEST_RUN_PATH", "some_path")
+    result = testdir.runpytest_subprocess()
+    result.stderr.fnmatch_lines(
+        ["::error file=some_path/test_annotation_fail_runpath.py,line=5::test_fail*assert 0*",]
+    )
+
+
 def test_annotation_long(testdir):
     testdir.makepyfile(
         """

pytest_github_actions_annotate_failures/plugin.py

@@ -31,6 +31,10 @@ def pytest_runtest_makereport(item, call):
         # collect information to be annotated
         filesystempath, lineno, _ = report.location
 
+        runpath = os.environ.get("PYTEST_RUN_PATH")
+        if runpath:
+            filesystempath = os.path.join(runpath, filesystempath)
+
         # try to convert to absolute path in GitHub Actions
         workspace = os.environ.get("GITHUB_WORKSPACE")
         if workspace: