dosage/dosage

#!/usr/bin/env python
# -*- coding: iso-8859-1 -*-
# Dosage, the webcomic downloader
# Copyright (C) 2004-2005 Tristan Seligmann and Jonathan Jacobs
# Copyright (C) 2012-2013 Bastian Kleineidam
from __future__ import print_function
import sys
import os
import argparse
import pydoc
from collections import OrderedDict

from dosagelib import events, scraper
from dosagelib.output import out
from dosagelib.util import internal_error, getDirname, strlimit
from dosagelib.ansicolor import get_columns
from dosagelib.configuration import App, Freeware, Copyright, SupportUrl


class ArgumentParser(argparse.ArgumentParser):
    """Custom argument parser."""

    def print_help(self, file=None):
        """Paginate help message on TTYs."""
        msg = self.format_help()
        if file is None:
            file = sys.stdout
        if hasattr(file, "isatty") and file.isatty():
            pydoc.pager(msg)
        else:
            print(msg, file=file)


Examples = """\
EXAMPLES
List available comics (ca. 3000 at the moment):
  dosage -l

Get the latest comic of for example CalvinAndHobbes and save it in the "Comics"
directory:
  dosage CalvinAndHobbes

If you already have downloaded several comics and want to get the latest
strips of all of them:
  dosage --continue @

On Unix, xargs(1) can download several comic strips in parallel,
for example using up to 4 processes:
  cd Comics && find . -type d | xargs -n1 -P4 dosage -b . -v
"""


def setupOptions():
    """Construct option parser.
    @return: new option parser
    @rtype argparse.ArgumentParser
    """
    kwargs = dict(
        description = "A commandline webcomic downloader and archiver.",
        epilog = Examples,
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    if sys.argv[0].endswith("mainline"):
        out.warn("the 'mainline' program is deprecated, please use the new 'dosage' program")
        kwargs["prog"] = "dosage"
    parser = ArgumentParser(**kwargs)
    parser.add_argument('-v', '--verbose', action='count', default=0, help='provides verbose output, use multiple times for more verbosity')
    parser.add_argument('-n', '--numstrips', action='store', type=int, default=0, help='traverse and retrieve the given number of comic strips; use --all to retrieve all comic strips')
    parser.add_argument('-a', '--all', action='store_true', default=None, help='traverse and retrieve all comic strips')
    parser.add_argument('-c', '--continue', action='store_true', dest='cont', default=None, help='traverse and retrieve comic strips until an existing one is found')
    parser.add_argument('-b', '--basepath', action='store', default='Comics', help='set the path to create invidivual comic directories in, default is Comics', metavar='PATH')
    parser.add_argument('--baseurl', action='store', default=None, help='the base URL of your comics directory (for RSS, HTML, etc.); this should correspond to --base-path', metavar='PATH')
    parser.add_argument('-l', '--list', action='store_const', const=1, help='list available comic modules')
    parser.add_argument('--singlelist', action='store_const', const=2, dest='list', help='list available comic modules in a single list')
    parser.add_argument('--version', action='store_true', help='display the version number')
    parser.add_argument('-m', '--modulehelp', action='store_true', help='display help for comic modules')
    parser.add_argument('-t', '--timestamps', action='store_true', default=False, help='print timestamps for all output at any info level')
    parser.add_argument('-o', '--output', action='store', choices=events.getHandlers(), help='output formatting for downloaded comics')
    parser.add_argument('--adult', action='store_true', default=False, help='confirms that you are old enough to view adult content')
    parser.add_argument('--multimatch', action='store_true', default=False, help='')
    parser.add_argument('comic', nargs='+', help='comic module name (including case insensitive substrings)')
    try:
        import argcomplete
        argcomplete.autocomplete(parser)
    except ImportError:
        pass
    return parser


def displayVersion():
    """Display application name, version, copyright and license."""
    print(App)
    print(Copyright)
    print(Freeware)
    print("For support see", SupportUrl)
    return 0


def setOutputInfo(options):
    """Set global output level and timestamp option."""
    out.level = 0
    out.level += options.verbose
    out.timestamps = options.timestamps


def saveComicStrip(strip, basepath):
    """Save a comic strip which can consist of multiple images."""
    errors = 0
    allskipped = True
    for image in strip.getImages():
        try:
            filename, saved = image.save(basepath)
            if saved:
                allskipped = False
        except IOError as msg:
            out.error('Could not save image at %s to %s: %s' % (image.referrer, image.filename, msg))
            errors += 1
    return errors, allskipped


def displayHelp(comics):
    """Print help for comic strips."""
    try:
        for scraperobj in getScrapers(comics):
            displayComicHelp(scraperobj)
    except ValueError as msg:
        out.error(msg)
        return 1
    return 0


def displayComicHelp(scraperobj):
    """Print description and help for a comic."""
    out.context = scraperobj.get_name()
    try:
        if scraperobj.description:
            for line in scraperobj.description.splitlines():
                out.info(line)
        if scraperobj.help:
            for line in scraperobj.help.splitlines():
                out.info(line)
    finally:
        out.context = ''


def getComics(options):
    """Retrieve comics."""
    errors = 0
    if options.output:
        events.installHandler(options.output, options.basepath, options.baseurl)
    events.getHandler().start()
    try:
        for scraperobj in getScrapers(options.comic, options.basepath, options.adult, options.multimatch):
            errors += getStrips(scraperobj, options)
    except ValueError as msg:
        out.error(msg)
        errors += 1
    finally:
        out.context = ''
        events.getHandler().end()
    return errors


def getStrips(scraperobj, options):
    """Get all strips from a scraper."""
    errors = 0
    out.context = scraperobj.get_name()
    if options.all:
        strips = scraperobj.getAllStrips()
    elif options.numstrips:
        strips = scraperobj.getAllStrips(options.numstrips)
    else:
        strips = scraperobj.getCurrentStrips()
    try:
        for strip in strips:
            _errors, skipped = saveComicStrip(strip, options.basepath)
            errors += _errors
            if skipped and options.cont:
                # stop when retrieval skipped an image for one comic strip
                out.info("Stop retrieval because image file already exists")
                break
    except (ValueError, IOError) as msg:
        out.error(msg)
        errors += 1
    return errors


def run(options):
    """Execute comic commands."""
    setOutputInfo(options)
    if options.version:
        return displayVersion()
    if options.list:
        return doList(options.list == 1)
    if options.modulehelp:
        return displayHelp(options.comic)
    return getComics(options)


def doList(columnList):
    """List available comics."""
    out.info('Available comic scrapers:')
    out.info('Comics marked with [A] require age confirmation with the --adult option.')
    scrapers = sorted(getScrapers(['@@']), key=lambda s: s.get_name())
    try:
        if columnList:
            num = doColumnList(scrapers)
        else:
            num = doSingleList(scrapers)
        out.info('%d supported comics.' % num)
    except IOError:
        pass
    return 0


def doSingleList(scrapers):
    """Get list of scraper names, one per line."""
    for num, scraperobj in enumerate(scrapers):
        print(getScraperName(scraperobj))
    return num


def doColumnList(scrapers):
    """Get list of scraper names with multiple names per line."""
    screenWidth = get_columns(sys.stdout)
    # limit name length so at least two columns are there
    limit = (screenWidth / 2) - 8
    names = [getScraperName(scraperobj, limit=limit) for scraperobj in scrapers]
    num = len(names)
    maxlen = max(len(name) for name in names)
    namesPerLine = max(int(screenWidth / (maxlen + 1)), 1)
    while names:
        print(''.join(name.ljust(maxlen) for name in names[:namesPerLine]))
        del names[:namesPerLine]
    return num


def getScraperName(scraperobj, limit=None):
    """Get comic scraper name."""
    suffix = " [A]" if scraperobj.adult else ""
    name = scraperobj.get_name()
    if limit is not None:
        name = strlimit(name, limit)
    return name + suffix


def getScrapers(comics, basepath=None, adult=True, multiple_allowed=False):
    """Get scraper objects for the given comics."""
    if '@' in comics:
        # only scrapers whose directory already exists
        if len(comics) > 1:
            out.warn("using '@' as comic name ignores all other specified comics.")
        for scraperclass in scraper.get_scraperclasses():
            if not adult and scraperclass.adult:
                warn_adult(scraperclass)
                continue
            dirname = getDirname(scraperclass.get_name())
            if os.path.isdir(os.path.join(basepath, dirname)):
                yield scraperclass()
    elif '@@' in comics:
        # all scrapers
        for scraperclass in scraper.get_scraperclasses():
            if not adult and scraperclass.adult:
                warn_adult(scraperclass)
                continue
            yield scraperclass()
    else:
        # get only selected comic scrapers
        # store them in an ordered set to eliminate duplicates
        scrapers = OrderedDict()
        for comic in comics:
            if ':' in comic:
                name, index = comic.split(':', 1)
                indexes = index.split(',')
            else:
                name = comic
                indexes = None
            for scraperclass in scraper.find_scraperclasses(name, multiple_allowed=multiple_allowed):
                if not adult and scraperclass.adult:
                    warn_adult(scraperclass)
                    continue
                scraperobj = scraperclass(indexes=indexes)
                if scraperobj not in scrapers:
                    scrapers[scraperobj] = True
        for scraperobj in scrapers:
            yield scraperobj


def warn_adult(scraperclass):
    """Print warning about adult content."""
    out.warn("skipping adult comic %s; use the --adult option to confirm your age" % scraperclass.get_name())


def main():
    """Parse options and execute commands."""
    try:
        parser = setupOptions()
        res = run(parser.parse_args())
    except KeyboardInterrupt:
        print("Aborted.")
        res = 1
    except Exception:
        internal_error()
        res = 2
    return res


def profile():
    """Profile the loading of all scrapers."""
    import cProfile
    cProfile.run("scraper.get_scraperclasses()", "dosage.prof")


def viewprof():
    """View profile stats."""
    import pstats
    stats = pstats.Stats("dosage.prof")
    stats.strip_dirs().sort_stats("cumulative").print_stats(100)


if __name__ == '__main__':
    sys.exit(main())
    #profile()
    #viewprof()