#!/usr/bin/env python3
# Copyright (c) 2016 Comcast Cable Communications Management, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Looks for preprocessor macros with struct initializers and siphons them
# off into another file for later parsing; ostensibly to generate
# documentation from struct initializer data.

import argparse
import logging
import os

import siphon

DEFAULT_LOGFILE = None
DEFAULT_LOGLEVEL = "warning"
DEFAULT_OUTPUT = "build-root/docs/siphons"
DEFAULT_PREFIX = os.getcwd()

ap = argparse.ArgumentParser()
ap.add_argument("--log-file", default=DEFAULT_LOGFILE,
                help="Log file [%s]" % DEFAULT_LOGFILE)
ap.add_argument("--log-level", default=DEFAULT_LOGLEVEL,
                choices=["debug", "info", "warning", "error", "critical"],
                help="Logging level [%s]" % DEFAULT_LOGLEVEL)

ap.add_argument("--output", '-o', metavar="directory", default=DEFAULT_OUTPUT,
                help="Output directory for .siphon files [%s]" %
                     DEFAULT_OUTPUT)
ap.add_argument("--input-prefix", metavar="path", default=DEFAULT_PREFIX,
                help="Prefix to strip from input pathnames [%s]" %
                     DEFAULT_PREFIX)
ap.add_argument("input", nargs='+', metavar="input_file",
                help="Input C source files")
args = ap.parse_args()

logging.basicConfig(filename=args.log_file,
                    level=getattr(logging, args.log_level.upper(), None))
log = logging.getLogger("siphon_generate")


generate = siphon.generate.Generate(output_directory=args.output,
                                    input_prefix=args.input_prefix)

# Pre-process file names in case they indicate a file with
# a list of files
files = []
for filename in args.input:
    if filename.startswith('@'):
        with open(filename[1:], 'r') as fp:
            lines = fp.readlines()
            for line in lines:
                file = line.strip()
                if file not in files:
                    files.append(file)
            lines = None
    else:
        if filename not in files:
            files.append(filename)

# Iterate all the input files we've been given
for filename in files:
    generate.parse(filename)

# Write the extracted data
generate.deliver()

# All done
