Create a JSON report

1 files changed, 37 insertions, 1 deletions

diff --git a/coverage/report.py b/coverage/report.py
index 9a740290..d24dddc8 100644
--- a/coverage/report.py
+++ b/coverage/report.py
@@ -2,9 +2,45 @@
 # For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
 
 """Reporter foundation for coverage.py."""
+import sys
 
+from coverage import env
 from coverage.files import prep_patterns, FnmatchMatcher
-from coverage.misc import CoverageException, NoSource, NotPython
+from coverage.misc import CoverageException, NoSource, NotPython, ensure_dir_for_file, file_be_gone
+
+
+def render_report(output_path, reporter, morfs):
+    """Run the provided reporter ensuring any required setup and cleanup is done
+
+    At a high level this method ensures the output file is ready to be written to. Then writes the
+    report to it. Then closes the file and deletes any garbage created if necessary.
+    """
+    file_to_close = None
+    delete_file = False
+    if output_path:
+        if output_path == '-':
+            outfile = sys.stdout
+        else:
+            # Ensure that the output directory is created; done here
+            # because this report pre-opens the output file.
+            # HTMLReport does this using the Report plumbing because
+            # its task is more complex, being multiple files.
+            ensure_dir_for_file(output_path)
+            open_kwargs = {}
+            if env.PY3:
+                open_kwargs['encoding'] = 'utf8'
+            outfile = open(output_path, "w", **open_kwargs)
+            file_to_close = outfile
+    try:
+        return reporter.report(morfs, outfile=outfile)
+    except CoverageException:
+        delete_file = True
+        raise
+    finally:
+        if file_to_close:
+            file_to_close.close()
+            if delete_file:
+                file_be_gone(output_path)
 
 
 def get_analysis_to_report(coverage, morfs):