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450 lines
14 KiB
450 lines
14 KiB
#!/usr/bin/env python3
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#
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# updateDocumentToC.py
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#
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# Insert table of contents at top of Catch markdown documents.
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#
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# This script is distributed under the GNU General Public License v3.0
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#
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# It is based on markdown-toclify version 1.7.1 by Sebastian Raschka,
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# https://github.com/rasbt/markdown-toclify
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#
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from __future__ import print_function
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import argparse
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import glob
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import os
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import re
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import sys
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from scriptCommon import catchPath
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# Configuration:
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minTocEntries = 4
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headingExcludeDefault = [1,3,4,5] # use level 2 headers for at default
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headingExcludeRelease = [1,3,4,5] # use level 1 headers for release-notes.md
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documentsDefault = os.path.join(os.path.relpath(catchPath), 'docs/*.md')
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releaseNotesName = 'release-notes.md'
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contentTitle = '**Contents**'
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contentLineNo = 4
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contentLineNdx = contentLineNo - 1
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# End configuration
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VALIDS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-&'
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def readLines(in_file):
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"""Returns a list of lines from a input markdown file."""
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with open(in_file, 'r') as inf:
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in_contents = inf.read().split('\n')
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return in_contents
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def removeLines(lines, remove=('[[back to top]', '<a class="mk-toclify"')):
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"""Removes existing [back to top] links and <a id> tags."""
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if not remove:
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return lines[:]
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out = []
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for l in lines:
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if l.startswith(remove):
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continue
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out.append(l)
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return out
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def removeToC(lines):
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"""Removes existing table of contents starting at index contentLineNdx."""
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if not lines[contentLineNdx ].startswith(contentTitle):
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return lines[:]
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result_top = lines[:contentLineNdx]
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pos = contentLineNdx + 1
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while lines[pos].startswith('['):
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pos = pos + 1
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result_bottom = lines[pos + 1:]
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return result_top + result_bottom
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def dashifyHeadline(line):
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"""
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Takes a header line from a Markdown document and
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returns a tuple of the
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'#'-stripped version of the head line,
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a string version for <a id=''></a> anchor tags,
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and the level of the headline as integer.
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E.g.,
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>>> dashifyHeadline('### some header lvl3')
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('Some header lvl3', 'some-header-lvl3', 3)
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"""
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stripped_right = line.rstrip('#')
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stripped_both = stripped_right.lstrip('#')
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level = len(stripped_right) - len(stripped_both)
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stripped_wspace = stripped_both.strip()
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# GitHub's sluggification works in an interesting way
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# 1) '+', '/', '(', ')' and so on are just removed
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# 2) spaces are converted into '-' directly
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# 3) multiple -- are not collapsed
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dashified = ''
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for c in stripped_wspace:
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if c in VALIDS:
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dashified += c.lower()
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elif c.isspace():
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dashified += '-'
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else:
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# Unknown symbols are just removed
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continue
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return [stripped_wspace, dashified, level]
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def tagAndCollect(lines, id_tag=True, back_links=False, exclude_h=None):
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"""
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Gets headlines from the markdown document and creates anchor tags.
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Keyword arguments:
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lines: a list of sublists where every sublist
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represents a line from a Markdown document.
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id_tag: if true, creates inserts a the <a id> tags (not req. by GitHub)
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back_links: if true, adds "back to top" links below each headline
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exclude_h: header levels to exclude. E.g., [2, 3]
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excludes level 2 and 3 headings.
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Returns a tuple of 2 lists:
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1st list:
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A modified version of the input list where
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<a id="some-header"></a> anchor tags where inserted
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above the header lines (if github is False).
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2nd list:
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A list of 3-value sublists, where the first value
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represents the heading, the second value the string
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that was inserted assigned to the IDs in the anchor tags,
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and the third value is an integer that represents the headline level.
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E.g.,
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[['some header lvl3', 'some-header-lvl3', 3], ...]
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"""
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out_contents = []
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headlines = []
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for l in lines:
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saw_headline = False
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orig_len = len(l)
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l_stripped = l.lstrip()
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if l_stripped.startswith(('# ', '## ', '### ', '#### ', '##### ', '###### ')):
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# comply with new markdown standards
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# not a headline if '#' not followed by whitespace '##no-header':
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if not l.lstrip('#').startswith(' '):
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continue
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# not a headline if more than 6 '#':
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if len(l) - len(l.lstrip('#')) > 6:
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continue
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# headers can be indented by at most 3 spaces:
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if orig_len - len(l_stripped) > 3:
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continue
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# ignore empty headers
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if not set(l) - {'#', ' '}:
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continue
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saw_headline = True
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dashified = dashifyHeadline(l)
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if not exclude_h or not dashified[-1] in exclude_h:
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if id_tag:
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id_tag = '<a class="mk-toclify" id="%s"></a>'\
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% (dashified[1])
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out_contents.append(id_tag)
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headlines.append(dashified)
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out_contents.append(l)
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if back_links and saw_headline:
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out_contents.append('[[back to top](#table-of-contents)]')
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return out_contents, headlines
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def positioningHeadlines(headlines):
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"""
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Strips unnecessary whitespaces/tabs if first header is not left-aligned
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"""
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left_just = False
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for row in headlines:
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if row[-1] == 1:
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left_just = True
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break
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if not left_just:
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for row in headlines:
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row[-1] -= 1
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return headlines
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def createToc(headlines, hyperlink=True, top_link=False, no_toc_header=False):
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"""
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Creates the table of contents from the headline list
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that was returned by the tagAndCollect function.
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Keyword Arguments:
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headlines: list of lists
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e.g., ['Some header lvl3', 'some-header-lvl3', 3]
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hyperlink: Creates hyperlinks in Markdown format if True,
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e.g., '- [Some header lvl1](#some-header-lvl1)'
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top_link: if True, add a id tag for linking the table
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of contents itself (for the back-to-top-links)
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no_toc_header: suppresses TOC header if True.
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Returns a list of headlines for a table of contents
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in Markdown format,
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e.g., [' - [Some header lvl3](#some-header-lvl3)', ...]
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"""
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processed = []
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if not no_toc_header:
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if top_link:
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processed.append('<a class="mk-toclify" id="table-of-contents"></a>\n')
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processed.append(contentTitle + '<br>')
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for line in headlines:
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if hyperlink:
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item = '[%s](#%s)' % (line[0], line[1])
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else:
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item = '%s- %s' % ((line[2]-1)*' ', line[0])
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processed.append(item + '<br>')
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processed.append('\n')
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return processed
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def buildMarkdown(toc_headlines, body, spacer=0, placeholder=None):
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"""
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Returns a string with the Markdown output contents incl.
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the table of contents.
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Keyword arguments:
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toc_headlines: lines for the table of contents
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as created by the createToc function.
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body: contents of the Markdown file including
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ID-anchor tags as returned by the
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tagAndCollect function.
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spacer: Adds vertical space after the table
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of contents. Height in pixels.
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placeholder: If a placeholder string is provided, the placeholder
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will be replaced by the TOC instead of inserting the TOC at
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the top of the document
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"""
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if spacer:
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spacer_line = ['\n<div style="height:%spx;"></div>\n' % (spacer)]
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toc_markdown = "\n".join(toc_headlines + spacer_line)
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else:
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toc_markdown = "\n".join(toc_headlines)
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if placeholder:
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body_markdown = "\n".join(body)
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markdown = body_markdown.replace(placeholder, toc_markdown)
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else:
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body_markdown_p1 = "\n".join(body[:contentLineNdx ]) + '\n'
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body_markdown_p2 = "\n".join(body[ contentLineNdx:])
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markdown = body_markdown_p1 + toc_markdown + body_markdown_p2
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return markdown
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def outputMarkdown(markdown_cont, output_file):
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"""
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Writes to an output file if `outfile` is a valid path.
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"""
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if output_file:
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with open(output_file, 'w') as out:
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out.write(markdown_cont)
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def markdownToclify(
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input_file,
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output_file=None,
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min_toc_len=2,
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github=False,
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back_to_top=False,
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nolink=False,
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no_toc_header=False,
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spacer=0,
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placeholder=None,
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exclude_h=None):
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""" Function to add table of contents to markdown files.
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Parameters
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-----------
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input_file: str
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Path to the markdown input file.
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output_file: str (default: None)
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Path to the markdown output file.
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min_toc_len: int (default: 2)
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Miniumum number of entries to create a table of contents for.
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github: bool (default: False)
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Uses GitHub TOC syntax if True.
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back_to_top: bool (default: False)
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Inserts back-to-top links below headings if True.
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nolink: bool (default: False)
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Creates the table of contents without internal links if True.
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no_toc_header: bool (default: False)
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Suppresses the Table of Contents header if True
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spacer: int (default: 0)
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Inserts horizontal space (in pixels) after the table of contents.
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placeholder: str (default: None)
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Inserts the TOC at the placeholder string instead
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of inserting the TOC at the top of the document.
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exclude_h: list (default None)
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Excludes header levels, e.g., if [2, 3], ignores header
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levels 2 and 3 in the TOC.
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Returns
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-----------
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changed: Boolean
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True if the file has been updated, False otherwise.
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"""
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cleaned_contents = removeLines(
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removeToC(readLines(input_file)),
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remove=('[[back to top]', '<a class="mk-toclify"'))
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processed_contents, raw_headlines = tagAndCollect(
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cleaned_contents,
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id_tag=not github,
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back_links=back_to_top,
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exclude_h=exclude_h)
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# add table of contents?
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if len(raw_headlines) < min_toc_len:
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processed_headlines = []
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else:
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leftjustified_headlines = positioningHeadlines(raw_headlines)
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processed_headlines = createToc(
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leftjustified_headlines,
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hyperlink=not nolink,
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top_link=not nolink and not github,
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no_toc_header=no_toc_header)
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if nolink:
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processed_contents = cleaned_contents
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cont = buildMarkdown(
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toc_headlines=processed_headlines,
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body=processed_contents,
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spacer=spacer,
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placeholder=placeholder)
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if output_file:
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outputMarkdown(cont, output_file)
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def isReleaseNotes(f):
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return os.path.basename(f) == releaseNotesName
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def excludeHeadingsFor(f):
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return headingExcludeRelease if isReleaseNotes(f) else headingExcludeDefault
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def updateSingleDocumentToC(input_file, min_toc_len, verbose=False):
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"""Add or update table of contents in specified file. Return 1 if file changed, 0 otherwise."""
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if verbose :
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print( 'file: {}'.format(input_file))
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output_file = input_file + '.tmp'
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markdownToclify(
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input_file=input_file,
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output_file=output_file,
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min_toc_len=min_toc_len,
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github=True,
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back_to_top=False,
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nolink=False,
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no_toc_header=False,
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spacer=False,
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placeholder=False,
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exclude_h=excludeHeadingsFor(input_file))
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# prevent race-condition (Python 3.3):
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if sys.version_info >= (3, 3):
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os.replace(output_file, input_file)
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else:
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os.remove(input_file)
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os.rename(output_file, input_file)
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return 1
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def updateDocumentToC(paths, min_toc_len, verbose):
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"""Add or update table of contents to specified paths. Return number of changed files"""
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n = 0
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for g in paths:
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for f in glob.glob(g):
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if os.path.isfile(f):
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n = n + updateSingleDocumentToC(input_file=f, min_toc_len=min_toc_len, verbose=verbose)
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return n
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def updateDocumentToCMain():
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"""Add or update table of contents to specified paths."""
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parser = argparse.ArgumentParser(
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description='Add or update table of contents in markdown documents.',
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epilog="""""",
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formatter_class=argparse.RawTextHelpFormatter)
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parser.add_argument(
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'Input',
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metavar='file',
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type=str,
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nargs=argparse.REMAINDER,
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help='files to process, at default: docs/*.md')
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parser.add_argument(
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'-v', '--verbose',
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action='store_true',
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help='report the name of the file being processed')
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parser.add_argument(
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'--min-toc-entries',
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dest='minTocEntries',
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default=minTocEntries,
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type=int,
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metavar='N',
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help='the minimum number of entries to create a table of contents for [{default}]'.format(default=minTocEntries))
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parser.add_argument(
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'--remove-toc',
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action='store_const',
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dest='minTocEntries',
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const=99,
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help='remove all tables of contents')
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args = parser.parse_args()
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paths = args.Input if args.Input else [documentsDefault]
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changedFiles = updateDocumentToC(paths=paths, min_toc_len=args.minTocEntries, verbose=args.verbose)
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if changedFiles > 0:
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print( "Processed table of contents in " + str(changedFiles) + " file(s)" )
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else:
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print( "No table of contents added or updated" )
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if __name__ == '__main__':
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updateDocumentToCMain()
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# end of file
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