vizualisation: Add tf-main vizualization script

Add `tf-a-main-results.{bash,plot}` to fetch test results from a Jenkins
build of tf-main and vizualise them. Update README.rst with usage info
for the new script and plot description.

Change-Id: I837a2dcb4cd3247b24ba9eec6557699e9a75e9c2
Signed-off-by: Nathan Dunne <Nathan.Dunne@arm.com>
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/script/gen_results_report.py b/script/gen_results_report.py
new file mode 100755
index 0000000..64918b2
--- /dev/null
+++ b/script/gen_results_report.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2022, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+import argparse
+import csv
+import os
+
+from gen_test_report import emit_header, print_error_message
+
+TABLE_HEADER = """\
+<table id="tf-results-panel">
+  <tbody>
+    <tr>
+      <td class="results-col">
+        <table>
+          <tbody>
+            <thead>
+              <tr>
+                <th>Passed</th>
+                <th>Skipped</th>
+                <th>Crashed</th>
+                <th>Failed</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr>"""
+
+TABLE_FOOTER = """\
+              </tr>
+            </tbody>
+          </tbody>
+        </table>
+      </td>
+      <td class="button-col">
+        <button id="tf-download-button" onclick="window.open('{}','_blank')">Download Plot</button>
+      </td>
+    </tr>
+  </tbody>
+</table>"""
+
+# Open and sum the results of a comma-separated test result file.
+def fetch_results(csv_path):
+    failed = passed = skipped = crashed = 0
+    with open(csv_path, "r") as fd:
+        for test in csv.DictReader(fd):
+            failed = failed + int(test["Failed"])
+            passed = passed + int(test["Passed"])
+            skipped = skipped + int(test["Skipped"])
+            crashed = crashed + int(test["Crashed"])
+    return passed, skipped, crashed, failed
+
+
+def main(fd, csv_path, png_path):
+    results_row = ("""<td>{}</td>\n""".rjust(28) * 4).format(
+        *fetch_results(csv_path)
+    )
+
+    # Emite header and style sheet.
+    emit_header(fd)
+
+    print(TABLE_HEADER, file=fd)
+    print(results_row, file=fd)
+
+    # Format table button to link to full-size plot of results.
+    TABLE_FOOTER.format(build_url + "/" + png_path)
+    print(TABLE_FOOTER, file=fd)
+
+
+if __name__ == "__main__":
+    global build_url
+
+    parser = argparse.ArgumentParser()
+
+    # Add arguments
+    parser.add_argument(
+        "--output",
+        "-o",
+        default="report.html",
+        help="Path to output file",
+    )
+    parser.add_argument(
+        "--csv",
+        default=None,
+        help="Path to input CSV with data for the target job",
+    )
+    parser.add_argument(
+        "--png", default=None, help="Filename for PNG results plot"
+    )
+
+    # The build url and target for the results are needed in-case the user hasn't provided a
+    # paths to the inputs.
+    opts = parser.parse_args()
+    build_url = os.environ["BUILD_URL"]
+    target_job = os.environ["TARGET_BUILD"]
+    target_job_name = target_job[: target_job.find("/")]
+
+    # Use filenames provided by user or try and infer based off the target name from the environment.
+    output_path = "report.html" if not opts.output else opts.output
+    csv_path = target_job_name + "results.csv" if not opts.csv else opts.csv
+    png_path = target_job_name + "results.png" if not opts.png else opts.png
+
+    with open(output_path, "w") as fd:
+        try:
+            main(output_path, csv_path, png_path)
+        except:
+            print_error_message(fd)
+            raise