wiki: Borrow markdown rendering from blog

[ipfire.org.git] / src / backend / wiki.py

#!/usr/bin/python3

import logging
import os.path
import re

from . import misc
from .decorators import *

class Wiki(misc.Object):
	def _get_pages(self, query, *args):
		res = self.db.query(query, *args)

		for row in res:
			yield Page(self.backend, row.id, data=row)

	def _get_page(self, query, *args):
		res = self.db.get(query, *args)

		if res:
			return Page(self.backend, res.id, data=res)

	def get_page_title(self, page, default=None):
		doc = self.get_page(page)
		if doc:
			return doc.title

		return default

	def get_page(self, page, revision=None):
		page = Page.sanitise_page_name(page)
		assert page

		if revision:
			return self._get_page("SELECT * FROM wiki WHERE page = %s \
				AND timestamp = %s", page, revision)
		else:
			return self._get_page("SELECT * FROM wiki WHERE page = %s \
				ORDER BY timestamp DESC LIMIT 1", page)

	def get_recent_changes(self, limit=None):
		return self._get_pages("SELECT * FROM wiki \
			WHERE timestamp >= NOW() - INTERVAL '4 weeks' \
			ORDER BY timestamp DESC LIMIT %s", limit)

	def create_page(self, page, author, content, changes=None, address=None):
		page = Page.sanitise_page_name(page)

		return self._get_page("INSERT INTO wiki(page, author_uid, markdown, changes, address) \
			VALUES(%s, %s, %s, %s, %s) RETURNING *", page, author.uid, content or None, changes, address)

	def delete_page(self, page, author, **kwargs):
		# Do nothing if the page does not exist
		if not self.get_page(page):
			return

		# Just creates a blank last version of the page
		self.create_page(page, author=author, content=None, **kwargs)

	@staticmethod
	def _split_url(url):
		parts = list(e for e in url.split("/") if e)

		num_parts = len(parts)
		for i in range(num_parts):
			yield "/".join(parts[:i])

	def make_breadcrumbs(self, url):
		for part in self._split_url(url):
			title = self.get_page_title(part, os.path.basename(part))

			yield ("/%s" % part, title)


class Page(misc.Object):
	def init(self, id, data=None):
		self.id = id
		self.data = data

	def __lt__(self, other):
		if isinstance(other, self.__class__):
			if self.page == other.page:
				return self.timestamp < other.timestamp

			return self.page < other.page

	@staticmethod
	def sanitise_page_name(page):
		if not page:
			return "/"

		# Make sure that the page name does NOT end with a /
		if page.endswith("/"):
			page = page[:-1]

		# Make sure the page name starts with a /
		if not page.startswith("/"):
			page = "/%s" % page

		# Remove any double slashes
		page = page.replace("//", "/")

		return page

	@property
	def url(self):
		return self.page

	@property
	def page(self):
		return self.data.page

	@property
	def title(self):
		return self._title or self.page[1:]

	@property
	def _title(self):
		if not self.markdown:
			return

		# Find first H1 headline in markdown
		markdown = self.markdown.splitlines()

		m = re.match(r"^# (.*)( #)?$", markdown[0])
		if m:
			return m.group(1)

	@lazy_property
	def author(self):
		if self.data.author_uid:
			return self.backend.accounts.get_by_uid(self.data.author_uid)

	def _render(self, text):
		logging.debug("Rendering %s" % self)

		# Borrow this from the blog
		return self.backend.blog._render_text(text, lang="markdown")

	@property
	def markdown(self):
		return self.data.markdown

	@property
	def html(self):
		return self.data.html or self._render(self.markdown)

	@property
	def timestamp(self):
		return self.data.timestamp

	def was_deleted(self):
		return self.markdown is None

	@lazy_property
	def breadcrumbs(self):
		return self.backend.wiki.make_breadcrumbs(self.page)

	def get_latest_revision(self):
		revisions = self.get_revisions()

		# Return first object
		for rev in revisions:
			return rev

	def get_revisions(self):
		return self.backend.wiki._get_pages("SELECT * FROM wiki \
			WHERE page = %s ORDER BY timestamp DESC", self.page)

	@property
	def changes(self):
		return self.data.changes

	# Sidebar

	@lazy_property
	def sidebar(self):
		parts = self.page.split("/")

		while parts:
			sidebar = self.backend.wiki.get_page(os.path.join(*parts, "sidebar"))
			if sidebar:
				return sidebar

			parts.pop()