tilde-wiki/tildewiki/compilation.py

137 lines
5.0 KiB
Python

import os
import re
from datetime import datetime
from typing import Optional
from markdown import markdown
DOUBLE_NEWLINE_RE = re.compile(r'\n\n', flags=re.MULTILINE|re.DOTALL)
HEADER_TITLE_RE = re.compile(r'<h([12])>(.*?)</h\1>')
TITLE_RE = re.compile(r'<title>.*?</title>')
LINK_RE = re.compile(r'href="\/wiki')
def relativize_links(content:str, depth:int) -> str:
"""Given compiled html content, change URLs that start in "/wiki" to be
relative instead of absolute. Depth indicates how many pairs of dots we
should use to traverse upward."""
dots = os.path.join(*['..' for _ in range(depth)])
repl = 'href="{}'.format(os.path.join(dots, 'wiki'))
return re.sub(LINK_RE, repl, content)
def compile_wiki(source_path: str, dest_path: str) -> None:
"""Given a source path (presumably a git repository) and a destination
path, compiles the files found in {source_path}/articles and compiles them all
to {dest_path}/.
THIS FUNCTION CLEARS {dest_path}/!
Be absolutely sure you know what you are doing when you call this ^_^
"""
last_compiled = '<p><em>last compiled: {}</em></p>'.format(datetime.utcnow())
header_content = compile_markdown(os.path.join(source_path, 'src/header.md'))
footer_content = last_compiled + compile_markdown(os.path.join(source_path, 'src/footer.md'))
articles_root = os.path.join(source_path, 'src/articles')
toc_content = '{}\n<ul>'.format(update_title(header_content, 'table of contents'))
depth = 0
for source_root, dirs, files in os.walk(articles_root):
depth += 1
current_suffix = source_root.replace(articles_root, '')
if current_suffix and current_suffix[0] == '/':
current_suffix = current_suffix[1:]
dest_root = os.path.join(dest_path, current_suffix)
for directory in dirs:
os.mkdir(os.path.join(dest_root, directory))
for source_filename in files:
if source_filename.startswith('.'):
continue
source_file_path = os.path.join(source_root, source_filename)
output = compile_source_file(
source_file_path,
header_content,
footer_content)
output = relativize_links(output, depth)
dest_filename = source_filename.split('.')[0] + '.html'
toc_content += '<li><a href="{}">{}</a></li>\n'.format(
os.path.join(current_suffix, dest_filename),
os.path.join(current_suffix,dest_filename.split('.')[0]))
with open(os.path.join(dest_root, dest_filename), 'w') as f:
f.write(output)
toc_content += '\n</ul>'
with open(os.path.join(dest_path, 'toc.html'), 'w') as f:
f.write(toc_content)
f.write(footer_content)
def slurp(file_path:str) -> str:
"""Convenience function for reading a file and returning its contents."""
content = None
with open(file_path, 'r') as f:
content = f.read()
return content
def compile_source_file(source_file_path:str, header_content:str, footer_content:str) -> str:
"""Given a path to a source file, this function:
- picks an appropriate compiler for the file extension
- compiles the file
- sandwiches it between the provided header and footer content
- returns the constructed string
"""
if not os.path.isabs(source_file_path):
raise ValueError(
'{} is not an absolute path.'.format(source_file_path))
compiler = None
if source_file_path.endswith('.md'):
compiler = compile_markdown
elif source_file_path.endswith('.txt'):
compiler = compile_plaintext
else:
# this just copies through any files that we don't recognize as needing
# conversion.
compiler = slurp
content = compiler(source_file_path)
title = extract_title(content)
if title is not None:
header_content = update_title(header_content, title)
return '{}\n{}\n{}'.format(header_content, content, footer_content)
def update_title(content:str, title:str) -> str:
"""Given a chunk of HTML, finds, updates, and returns the title element to
be the given title. If there is no title element, the content is returned
unmodified."""
return re.sub(TITLE_RE, '<title>{}</title>'.format(title), content)
def extract_title(content:str) -> Optional[str]:
"""Given a string of page content, look for a header in the first line.
Returns it if found; returns None otherwise."""
first_line = content.split('\n')[0]
matches = re.match(HEADER_TITLE_RE, first_line)
if matches is not None:
return matches.groups()[1]
return None
def compile_markdown(source_file_path:str) -> str:
"""Given a string of markdown, compiles it and returns the result."""
return markdown(
slurp(source_file_path),
output_format='html5')
def compile_plaintext(source_file_path:str) -> str:
output = '<p>\n'
output += re.sub(
DOUBLE_NEWLINE_RE,
'</p><p>',
slurp(source_file_path))
output += '\n</p>\n'
return output