Meson test log to HTML conversion script

## meson-html-report.py
#!/usr/bin/env python3

# meson-junit-report.py: Turns a Meson test log into an HTML report
#
# Copyright 2019  GNOME Foundation
#
# SPDX-License-Identifier: LGPL-2.1-or-later

import argparse
import datetime
import json
import os
import sys
from jinja2 import Template

REPORT_TEMPLATE = '''
<!DOCTYPE html>
<html lang="en">
<head>
  <title>{{ report.project_name }} Test Report</title>
  <meta charset="utf-8" />
</head>
<body>
  <header>
    <h1>{{ report.project_name }} :: Test Reports</h1>
    <div class="report-meta">
      <p><strong>Branch:</strong> {{ report.branch_name }}</p>
      <p><strong>Date:</strong> <time datetime="{{ report.date.isoformat() }}">{{ report.locale_date }}</time></p>
      {% if report.job_id %}<p><strong>Job ID:</strong> {{ report.job_id }}</p>{% endif %}
    </div>
  </header>

  <article>
    <section>
      <div class="summary">
        <h3>Summary</h3>
        <ul>
          <li><strong>Total units:</strong> {{ report.total_units }}</li>
          <li><strong>Passed:</strong> {{ report.total_successes }}</li>
          <li><strong>Failed:</strong> {{ report.total_failures }}</li>
        </ul>
      </div>
    </section>

    {% for suite_result in report.results_list %}
    <section>
      <div class="result">
        <h3>Suite: {{ suite_result.suite_name }}</h3>
        <ul>
          <li><strong>Units:</strong> {{ suite_result.n_units }}</li>
          <li><strong>Passed:</strong> {{ suite_result.n_successes }}</li>
          <li><strong>Failed:</strong> {{ suite_result.n_failures }}</li>
        </ul>
        {% for failure in suite_result.failures %}
            {% if loop.first %}
        <div>
          <h4>Failures</h4>
          <ul>
            {% endif %}
            <li>{{ failure.name }} - result: <span class="failure">{{ failure.result }}</span><br/>
            <pre>{{ failure.stdout }}</pre>
            </li>
            {% if loop.last %}
          </ul>
        </div>
            {% endif %}
        {% endfor %}
      </div>
    </section>
    {% endfor %}

  </article>
</body>
</html>
'''

aparser = argparse.ArgumentParser(description='Turns a Meson test log into an HTML report')
aparser.add_argument('--project-name', metavar='NAME',
                     help='The project name',
                     default='Unknown')
aparser.add_argument('--job-id', metavar='ID',
                     help='The job ID for the report',
                     default=None)
aparser.add_argument('--branch', metavar='NAME',
                     help='Branch of the project being tested',
                     default='master')
aparser.add_argument('--output', metavar='FILE',
                     help='The output HTML file, stdout by default',
                     type=argparse.FileType('w', encoding='UTF-8'),
                     default=sys.stdout)
aparser.add_argument('infile', metavar='FILE',
                     help='The input testlog.json, stdin by default',
                     type=argparse.FileType('r', encoding='UTF-8'),
                     default=sys.stdin)

args = aparser.parse_args()

outfile = args.output

suites = {}
for line in args.infile:
    data = json.loads(line)
    (full_suite, unit_name) = data['name'].split(' / ')
    (project_name, suite_name) = full_suite.split(':')

    unit = {
        'project-name': project_name,
        'suite': suite_name,
        'name': unit_name,
        'duration': data['duration'],
        'returncode': data['returncode'],
        'result': data['result'],
        'stdout': data['stdout'],
    }

    units = suites.setdefault(full_suite, [])
    units.append(unit)

report = {}
report['date'] = datetime.datetime.utcnow()
report['locale_date'] = report['date'].strftime("%c")
report['project_name'] = args.project_name
report['job_id'] = args.job_id
report['branch_name'] = args.branch
report['total_successes'] = 0
report['total_failures'] = 0
report['total_units'] = 0
report['results_list'] = []

for name, units in suites.items():
    (project_name, suite_name) = name.split(':')
    print('Processing {} suite {}:'.format(project_name, suite_name))

    def if_failed(unit):
        if unit['result'] in ['FAIL', 'TIMEOUT']:
            return True
        return False

    def if_succeded(unit):
        if unit['result'] in ['OK', 'EXPECTEDFAIL', 'SKIP']:
            return True
        return False

    successes = list(filter(if_succeded, units))
    failures = list(filter(if_failed, units))

    n_units = len(units)
    n_successes = len(successes)
    n_failures = len(failures)

    report['total_units'] += n_units
    report['total_successes'] += n_successes
    report['total_failures'] += n_failures
    print(' - {}: {} total, {} pass, {} fail'.format(suite_name, n_units, n_successes, n_failures))

    suite_report = {
        'suite_name': suite_name,
        'n_units': n_units,
        'successes': successes,
        'n_successes': n_successes,
        'failures': failures,
        'n_failures': n_failures,
    }
    report['results_list'].append(suite_report)

template = Template(REPORT_TEMPLATE)
outfile.write(template.render({'report': report}))