wttr.in/lib/view/wttr.py

# vim: set encoding=utf-8
# pylint: disable=wrong-import-position

"""
Main view (wttr.in) implementation.
The module is a wrapper for the modified Wego program.
"""

import sys
import re

from gevent.subprocess import Popen, PIPE

sys.path.insert(0, "..")
from translations import get_message, SUPPORTED_LANGS
from globals import (
    WEGO,
    TRANSLATION_TABLE,
    NOT_FOUND_LOCATION,
    DEFAULT_LOCATION,
    ANSI2HTML,
    error,
    remove_ansi,
)


def get_wetter(parsed_query):

    location = parsed_query["location"]
    html = parsed_query["html_output"]
    lang = parsed_query["lang"]

    location_not_found = False
    if location == NOT_FOUND_LOCATION:
        location_not_found = True

    stderr = ""
    returncode = 0
    if not location_not_found:
        stdout, stderr, returncode = _wego_wrapper(location, parsed_query)
        first_line, stdout = _wego_postprocessing(location, parsed_query, stdout)

    if location_not_found or (
        returncode != 0
        and (
            "Unable to find any matching weather"
            " location to the parsed_query submitted"
        )
        in stderr
    ):
        stdout, stderr, returncode = _wego_wrapper(DEFAULT_LOCATION, parsed_query)
        location_not_found = True

        not_found_header = """
>>>    _  _    ___  _  _     
>>>   | || |  / _ \| || |      
>>>   | || |_| | | | || |_      
>>>   |__   _| |_| |__   _|      
>>>      |_|  \___/   |_|    
>>>                       
>>>   404 %s: %s
>>>                 
""" % (
            get_message("UNKNOWN_LOCATION", lang).upper(),
            parsed_query["override_location_name"],
        )

        not_found_header = "\n".join(
            "\033[48;5;91m" + x + "   \033[0m"
            for x in not_found_header.splitlines()[1:]
        )

        not_found_footer = get_message("NOT_FOUND_MESSAGE", lang)
        not_found_footer = (
            "\n".join(
                "\033[48;5;91m " + x + " \033[0m"
                for x in not_found_footer.splitlines()
                if x
            )
            + "\n"
        )

        first_line, stdout = _wego_postprocessing(location, parsed_query, stdout)
        stdout = not_found_header + "\n----\n" + stdout + not_found_footer

    if html:
        return _htmlize(stdout, first_line, parsed_query)
    return stdout


def _wego_wrapper(location, parsed_query):

    lang = parsed_query["lang"]
    if location == DEFAULT_LOCATION:
        location_name = DEFAULT_LOCATION.capitalize()
    else:
        location_name = parsed_query["override_location_name"]

    cmd = [WEGO, "--city=%s" % location]

    if parsed_query.get("inverted_colors"):
        cmd += ["-inverse"]

    if parsed_query.get("use_ms_for_wind"):
        cmd += ["-wind_in_ms"]

    if parsed_query.get("narrow"):
        cmd += ["-narrow"]

    if lang and lang in SUPPORTED_LANGS:
        cmd += ["-lang=%s" % lang]

    if parsed_query.get("use_imperial", False):
        cmd += ["-imperial"]

    if location_name:
        cmd += ["-location_name", location_name]

    proc = Popen(cmd, stdout=PIPE, stderr=PIPE)
    stdout, stderr = proc.communicate()
    stdout = stdout.decode("utf-8")
    stderr = stderr.decode("utf-8")

    return stdout, stderr, proc.returncode


def _wego_postprocessing(location, parsed_query, stdout):
    full_address = parsed_query["full_address"]
    lang = parsed_query["lang"]

    if "days" in parsed_query:
        if parsed_query["days"] == "0":
            stdout = "\n".join(stdout.splitlines()[:7]) + "\n"
        if parsed_query["days"] == "1":
            stdout = "\n".join(stdout.splitlines()[:17]) + "\n"
        if parsed_query["days"] == "2":
            stdout = "\n".join(stdout.splitlines()[:27]) + "\n"

    first = stdout.splitlines()[0]
    rest = stdout.splitlines()[1:]
    if parsed_query.get("no-caption", False):
        if ":" in first:
            first = first.split(":", 1)[1]
            stdout = "\n".join([first.strip()] + rest) + "\n"

    if parsed_query.get("no-terminal", False):
        stdout = remove_ansi(stdout)

    if parsed_query.get("no-city", False):
        stdout = "\n".join(stdout.splitlines()[2:]) + "\n"

    if parsed_query.get("dumb", False):
        stdout = stdout.translate(TRANSLATION_TABLE)

    if (
        full_address
        and parsed_query.get("format", "txt") != "png"
        and (
            not parsed_query.get("no-city")
            and not parsed_query.get("no-caption")
            and not parsed_query.get("days") == "0"
        )
    ):
        line = "%s: %s [%s]\n" % (get_message("LOCATION", lang), full_address, location)
        stdout += line

    if parsed_query.get("padding", False):
        lines = [x.rstrip() for x in stdout.splitlines()]
        max_l = max(len(remove_ansi(x)) for x in lines)
        last_line = " " * max_l + "   .\n"
        stdout = " \n" + "\n".join("  %s  " % x for x in lines) + "\n" + last_line

    return first, stdout


def _htmlize(ansi_output, title, parsed_query):
    """Return HTML representation of `ansi_output`.
    Use `title` as the title of the page.
    Format page according to query parameters from `parsed_query`."""

    cmd = ["bash", ANSI2HTML, "--palette=solarized"]
    if not parsed_query.get("inverted_colors"):
        cmd += ["--bg=dark"]

    proc = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)
    stdout, stderr = proc.communicate(ansi_output.encode("utf-8"))
    stdout = stdout.decode("utf-8")
    stderr = stderr.decode("utf-8")
    if proc.returncode != 0:
        error(stdout + stderr)

    if parsed_query.get("inverted_colors"):
        stdout = stdout.replace(
            '<body class="">', '<body class="" style="background:white;color:#777777">'
        )

    title = "<title>%s</title>" % title
    opengraph = _get_opengraph(parsed_query)
    stdout = re.sub("<head>", "<head>" + title + opengraph, stdout)
    return stdout


def _get_opengraph(parsed_query):
    """Return OpenGraph data for `parsed_query`"""

    url = parsed_query["request_url"] or ""
    pic_url = url.replace("?", "_")

    return (
        '<meta property="og:image" content="%(pic_url)s_0pq.png" />'
        '<meta property="og:site_name" content="wttr.in" />'
        '<meta property="og:type" content="profile" />'
        '<meta property="og:url" content="%(url)s" />'
    ) % {
        "pic_url": pic_url,
        "url": url,
    }