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MakeSingleHeader.py
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MakeSingleHeader.py
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#!/usr/bin/env python
from __future__ import print_function, unicode_literals
import os
import re
from argparse import ArgumentParser
from subprocess import Popen, PIPE
import warnings
tag_str = r"""
^ # Begin of line
[/\s]+ # Whitespace or comment // chars
\[ # A literal [
{tag}: # The tag
(?P<name>[\w_]+) # name: group name
: # Colon
(?P<action>[\w_]+) # action: type of include
\] # A literal ]
\s* # Whitespace
$ # End of a line
(?P<content>.*) # All
^ # Begin of line
[/\s]+ # Whitespace or comment // chars
\[ # A literal [
{tag}: # The tag
(?P=name) # Repeated name
: # Colon
end # Literal "end"
\] # A literal ]
\s* # Whitespace
$ # End of a line
"""
DIR = os.path.dirname(os.path.abspath(__file__))
class HeaderGroups(dict):
def __init__(self, tag):
"""
A dictionary that also can read headers given a tag expression.
TODO: might have gone overboard on this one, could maybe be two functions.
"""
self.re_matcher = re.compile(
tag_str.format(tag=tag), re.MULTILINE | re.DOTALL | re.VERBOSE
)
super(HeaderGroups, self).__init__()
def read_header(self, filename):
"""
Read a header file in and add items to the dict, based on the item's action.
"""
with open(filename) as f:
inner = f.read()
matches = self.re_matcher.findall(inner)
if not matches:
warnings.warn(
"Failed to find any matches in {filename}".format(filename=filename)
)
for name, action, content in matches:
if action == "verbatim":
assert (
name not in self
), "{name} read in more than once! Quitting.".format(name=name)
self[name] = content
elif action == "set":
self[name] = self.get(name, set()) | set(content.strip().splitlines())
else:
raise RuntimeError("Action not understood, must be verbatim or set")
def post_process(self):
"""
Turn sets into multiple line strings.
"""
for key in self:
if isinstance(self[key], set):
self[key] = "\n".join(self[key])
def make_header(output, main_header, files, tag, namespace, macro=None, version=None):
"""
Makes a single header given a main header template and a list of files.
"""
groups = HeaderGroups(tag)
# Set tag if possible to class variable
try:
proc = Popen(
["git", "describe", "--tags", "--always"], cwd=str(DIR), stdout=PIPE
)
out, _ = proc.communicate()
groups["git"] = out.decode("utf-8").strip() if proc.returncode == 0 else ""
except OSError:
groups["git"] = ""
for f in files:
groups.read_header(f)
groups["namespace"] = namespace
groups["version"] = version or groups["git"]
groups.post_process()
with open(main_header) as f:
single_header = f.read().format(**groups)
if macro is not None:
before, after = macro
print("Converting macros", before, "->", after)
single_header.replace(before, after)
if output is not None:
with open(output, "w") as f:
f.write(single_header)
print("Created", output)
else:
print(single_header)
if __name__ == "__main__":
parser = ArgumentParser(
usage="Convert source to single header include. Can optionally add namespace and search-replace replacements (for macros)."
)
parser.add_argument("--output", default=None, help="Single header file output")
parser.add_argument(
"--main",
default="CLI11.hpp.in",
help="The main include file that defines the other files",
)
parser.add_argument("files", nargs="*", help="The header files")
parser.add_argument("--namespace", default="CLI", help="Set the namespace")
parser.add_argument("--tag", default="CLI11", help="Tag to look up")
parser.add_argument(
"--macro", nargs=2, help="Replaces OLD_PREFIX_ with NEW_PREFIX_"
)
parser.add_argument("--version", help="Include this version in the generated file")
args = parser.parse_args()
make_header(
args.output,
args.main,
args.files,
args.tag,
args.namespace,
args.macro,
args.version,
)