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amalgamate.py
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amalgamate.py
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#!/usr/bin/env python3
from pathlib import Path
from typing import List, Set
from glob import glob
from shutil import rmtree
from textwrap import dedent
import os
import re
import sys
import argparse
SAFETYHOOK_ROOT = Path(__file__).resolve().parent
PUBLIC_INCLUDE_PATHS = [
SAFETYHOOK_ROOT / 'include',
SAFETYHOOK_ROOT / 'include' / 'safetyhook',
]
INTERNAL_INCLUDE_PATHS = [SAFETYHOOK_ROOT / 'src']
INCLUDE_REGEXP = re.compile(r'^#\s*include\s*"((?:safety).*)"\s*$')
OUTPUT_DIR = SAFETYHOOK_ROOT / 'amalgamated-dist'
FILE_HEADER = ['// DO NOT EDIT. This file is auto-generated by `amalgamate.py`.', '']
parser = argparse.ArgumentParser(description='bundles cpp and hpp files together')
parser.add_argument('--polyfill', action='store_true',
help='replace std::except with a polyfill so it can be compiled on C++20 or older. https://raw.githubusercontent.com/TartanLlama/expected/master/include/tl/expected.hpp')
# Python versions before 3.10 don't have the root_dir argument for glob, so we
# crudely emulate it here.
def glob_in_dir(
pattern: str,
root_dir: Path,
):
cwd = os.getcwd()
root_dir = root_dir.resolve()
os.chdir(root_dir)
try:
for path in glob(pattern, recursive=True):
yield Path(root_dir) / path
finally:
os.chdir(cwd)
def find_include_path(
include: str,
search_paths: List[Path],
) -> Path:
for search_path in search_paths:
path = search_path / include
if path.exists():
return path.absolute()
else:
raise FileNotFoundError(f'can\'t find header: {include}')
def merge_headers(
*,
header: str,
search_paths: List[Path],
covered_headers: Set[Path],
stack: List[str],
) -> List[str]:
# Locate and load header contents.
path = find_include_path(header, search_paths)
with path.open() as f:
lines = [x.rstrip() for x in f]
if path in covered_headers:
return []
print(f'Processing header "{header}"')
covered_headers.add(path)
# Print the header we emit next & the include stack (if non-root).
include_stack = []
if stack:
include_stack = [
'//',
'// Include stack:',
*(f'// - {x}' for x in stack)
]
filtered = [
f'',
f'//',
f'// Header: {header}',
*include_stack,
f'//',
f'',
]
# Copy over lines and recursively inline all headers.
for line in lines:
match = INCLUDE_REGEXP.match(line)
if not match:
filtered.append(line)
continue
# Recurse into includes.
filtered += merge_headers(
header=match.group(1),
search_paths=search_paths,
covered_headers=covered_headers,
stack=stack + [header],
)
return filtered
def merge_sources(*, source_dir: Path, covered_headers: Set[Path]):
output = [
'#define NOMINMAX',
'',
'#include "safetyhook.hpp"',
'',
]
for source_file in glob_in_dir('**/*.cpp', source_dir):
print(f'Processing source file "{source_file}"')
# Print some comments to show where the code is from.
output += [
f'',
f'//',
f'// Source file: {source_file.relative_to(source_dir)}',
f'//',
f'',
]
# Read source file.
with (source_dir / source_file).open() as f:
lines = [x.rstrip() for x in f]
# Walk source file's lines.
for line in lines:
# Emit non-includes as-is.
match = INCLUDE_REGEXP.match(line)
if not match:
output.append(line)
continue
path = match.group(1)
if path in covered_headers:
continue
if 'Internal' not in path and 'Generated' not in path:
print(
f'WARN: Including header that looks like it is public '
f'and should thus already be covered by `safetyhook.h` '
f'during processing of source files: {path}'
)
print(f'Processing internal header "{path}"')
output += merge_headers(
header=path,
search_paths=PUBLIC_INCLUDE_PATHS + INTERNAL_INCLUDE_PATHS,
covered_headers=covered_headers,
stack=[],
)
return output
def do_polyfill(content):
return content.replace('#include <expected>',
dedent('''
#if __has_include("tl/expected.hpp")
#include "tl/expected.hpp"
#elif __has_include("expected.hpp")
#include "expected.hpp"
#else
#error "No <expected> polyfill found"
#endif
''')) \
.replace('std::expected', 'tl::expected') \
.replace('std::unexpected', 'tl::unexpected')
def main():
args = parser.parse_args()
polyfill = args.polyfill is True
if OUTPUT_DIR.exists():
print('Output directory exists. Deleting.')
rmtree(OUTPUT_DIR)
OUTPUT_DIR.mkdir()
covered_headers = set()
with open(OUTPUT_DIR / 'safetyhook.hpp', 'w') as f:
content = '\n'.join(FILE_HEADER + merge_headers(
header='safetyhook.hpp',
search_paths=PUBLIC_INCLUDE_PATHS,
covered_headers=covered_headers,
stack=[],
))
if polyfill:
content = do_polyfill(content)
f.write(content)
print(covered_headers)
with open(OUTPUT_DIR / 'safetyhook.cpp', 'w') as f:
content = '\n'.join(FILE_HEADER + merge_sources(
source_dir=SAFETYHOOK_ROOT / 'src',
covered_headers=covered_headers,
))
if polyfill:
content = do_polyfill(content)
f.write(content)
if __name__ == '__main__':
main()