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# Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Mechanism to generate static HTML redirect pages in the output
#
# Uses redirect_template.html and the list of pages given in
# conf.html_redirect_pages
#
# Adapted from ideas in https://tech.signavio.com/2017/managing-sphinx-redirects
import os.path
from sphinx.builders.html import StandaloneHTMLBuilder
REDIRECT_TEMPLATE = """
<html>
<head>
<meta http-equiv="refresh" content="0; url=$NEWURL" />
<script>
window.location.href = "$NEWURL"
</script>
</head>
<body>
<p>Page has moved <a href="$NEWURL">here</a>.</p>
</body>
</html>
"""
def setup(app):
app.add_config_value('html_redirect_pages', [], 'html')
app.connect('build-finished', create_redirect_pages)
# Since we're just setting up a build-finished hook, which runs
# after both reading and writing, this extension is safe for both.
return {
'parallel_read_safe': True,
'parallel_write_safe': True,
}
def create_redirect_pages(app, docname):
if not isinstance(app.builder, StandaloneHTMLBuilder):
return # only relevant for standalone HTML output
for (old_url, new_url) in app.config.html_redirect_pages:
print("Creating redirect %s to %s..." % (old_url, new_url))
if old_url.startswith('/'):
print("Stripping leading / from URL in config file...")
old_url = old_url[1:]
new_url = app.builder.get_relative_uri(old_url, new_url)
out_file = app.builder.get_outfilename(old_url)
print("HTML file %s redirects to relative URL %s" % (out_file, new_url))
out_dir = os.path.dirname(out_file)
if not os.path.exists(out_dir):
os.makedirs(out_dir)
content = REDIRECT_TEMPLATE.replace("$NEWURL", new_url)
if not os.path.exists(out_file):
with open(out_file, "w") as rp:
rp.write(content)
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