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#!/usr/bin/env python3
from pathlib import Path
import json
import os, os.path
import sys
name = 'process-docroot.py'
def log(*args, **kwargs):
kwargs['file'] = sys.stderr
return print(f'{name}:', *args, **kwargs)
def replace_docroot(relative_md_path: Path, content: str, book_root: Path):
assert not relative_md_path.is_absolute(), f'{relative_md_path=} from mdbook should be relative'
md_path_abs = book_root / relative_md_path
docroot_abs = md_path_abs.parent
assert docroot_abs.is_dir(), f'supposed docroot {docroot_abs} is not a directory (cwd={os.getcwd()})'
# The paths mdbook gives us are relative to the directory with book.toml.
# @docroot@ wants to be replaced with the path relative to `src/`.
docroot_rel = os.path.relpath(book_root / 'src', start=docroot_abs)
return content.replace('@docroot@', docroot_rel)
def recursive_replace(data, book_root):
match data:
case {'sections': sections}:
return data | dict(
sections = [recursive_replace(section, book_root) for section in sections],
)
case {'Chapter': chapter}:
# Path to the .md file for this chapter, relative to book_root.
path_to_chapter = Path('src') / chapter['path']
chapter_content = chapter['content']
return data | dict(
Chapter = chapter | dict(
content = replace_docroot(path_to_chapter, chapter_content, book_root),
sub_items = [recursive_replace(sub_item, book_root) for sub_item in chapter['sub_items']],
),
)
case rest:
assert False, f'should have been called on a dict, not {type(rest)=}\n\t{rest=}'
def main():
if len(sys.argv) > 1 and sys.argv[1] == 'supports':
log('confirming to mdbook that we support their stuff')
return 0
# mdbook communicates with us over stdin and stdout.
# It splorks us a JSON array, the first element describing the context,
# the second element describing the book itself,
# and then expects us to send it the modified book JSON over stdout.
context, book = json.load(sys.stdin)
# book_root is *not* @docroot@. @docroot@ gets replaced with a relative path to `./src/`.
# book_root is the directory where book.toml, aka `src`'s parent.
book_root = Path(context['root'])
assert book_root.exists(), f'{book_root=} does not exist'
assert book_root.joinpath('book.toml').is_file(), f'{book_root / "book.toml"} is not a file'
log('replacing all occurrences of @docroot@ with a relative path')
# Find @docroot@ in all parts of our recursive book structure.
replaced_content = recursive_replace(book, book_root)
replaced_content_str = json.dumps(replaced_content)
# Give mdbook our changes.
print(replaced_content_str)
log('done!')
try:
sys.exit(main())
except AssertionError as e:
print(f'{name}: INTERNAL ERROR in mdbook preprocessor', file=sys.stderr)
print(f'this is a bug in {name}')
raise
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