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All of our custom Markdown extensions have priorities that govern the order in which the preprocessors will be run. It is more convenient to have these all in one file so that you can easily discern the order at first glance. Thanks to Alya Abbott for reporting the bug that led to this refactoring!
71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
import os
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import re
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from typing import Any, List
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import markdown
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from markdown_include.include import IncludePreprocessor, MarkdownInclude
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from zerver.lib.exceptions import InvalidMarkdownIncludeStatement
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from zerver.lib.markdown.preprocessor_priorities import PREPROCESSOR_PRIORITES
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INC_SYNTAX = re.compile(r"\{!\s*(.+?)\s*!\}")
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class MarkdownIncludeCustom(MarkdownInclude):
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def extendMarkdown(self, md: markdown.Markdown) -> None:
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md.preprocessors.register(
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IncludeCustomPreprocessor(md, self.getConfigs()),
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"include_wrapper",
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PREPROCESSOR_PRIORITES["include"],
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)
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class IncludeCustomPreprocessor(IncludePreprocessor):
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"""
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This is a custom implementation of the markdown_include
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extension that checks for include statements and if the included
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macro file does not exist or can't be opened, raises a custom
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JsonableError exception. The rest of the functionality is identical
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to the original markdown_include extension.
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"""
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def run(self, lines: List[str]) -> List[str]:
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done = False
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while not done:
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for line in lines:
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loc = lines.index(line)
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m = INC_SYNTAX.search(line)
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if m:
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filename = m.group(1)
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filename = os.path.expanduser(filename)
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if not os.path.isabs(filename):
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filename = os.path.normpath(
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os.path.join(self.base_path, filename),
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)
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try:
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with open(filename, encoding=self.encoding) as r:
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text = r.readlines()
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except Exception as e:
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print(f"Warning: could not find file {filename}. Error: {e}")
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lines[loc] = INC_SYNTAX.sub("", line)
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raise InvalidMarkdownIncludeStatement(m.group(0).strip())
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line_split = INC_SYNTAX.split(line)
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if len(text) == 0:
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text.append("")
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for i in range(len(text)):
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text[i] = text[i].rstrip("\r\n")
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text[0] = line_split[0] + text[0]
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text[-1] = text[-1] + line_split[2]
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lines = lines[:loc] + text + lines[loc + 1 :]
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break
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else:
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done = True
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return lines
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def makeExtension(*args: Any, **kwargs: str) -> MarkdownIncludeCustom:
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return MarkdownIncludeCustom(kwargs)
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