dece
8de79a6e5a
Moved a lot of stuff from the readme to the help page so the program is more self-contained.
659 lines
23 KiB
Python
659 lines
23 KiB
Python
"""Main browser logic."""
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import curses
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import curses.ascii
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import curses.textpad
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import logging
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import os
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import subprocess
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import tempfile
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from math import inf
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from pathlib import Path
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from typing import Dict, Optional, Tuple
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from bebop.bookmarks import (
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get_bookmarks_path,
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get_bookmarks_document,
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save_bookmark,
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)
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from bebop.colors import ColorPair, init_colors
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from bebop.command_line import CommandLine
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from bebop.external import open_external_program
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from bebop.fs import get_identities_list_path
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from bebop.help import get_help
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from bebop.history import History
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from bebop.identity import load_identities
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from bebop.links import Links
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from bebop.mime import MimeType
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from bebop.mouse import ButtonState
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from bebop.navigation import (
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NO_NETLOC_SCHEMES,
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get_parent_url,
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get_root_url,
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join_url,
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parse_url,
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unparse_url,
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)
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from bebop.page import Page
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from bebop.page_pad import PagePad
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from bebop.welcome import WELCOME_PAGE
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class Browser:
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"""Manage the events, inputs and rendering.
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Attributes:
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- config: config dict passed to the browser.
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- stash: certificate stash passed to the browser.
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- screen: curses stdscr.
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- dim: current screen dimensions.
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- page_pad: curses pad containing the current page view.
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- status_line: curses window used to report current status.
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- command_line: a CommandLine object for the user to interact with.
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- running: the browser will continue running while this is true.
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- status_data: 3-uple of status text, color pair and attributes of the
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status line, used to reset status after an error.
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- history: an History object.
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- cache: a dict containing cached pages.
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- special_pages: a dict containing page names used with "bebop" scheme;
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values are dicts as well: the "open" key maps to a callable to use when
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the page is accessed, and the optional "source" key maps to callable
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returning the page source path.
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- last_download: tuple of MimeType and path, or None.
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- identities: identities map.
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"""
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def __init__(self, config, cert_stash):
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self.config = config
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self.stash = cert_stash
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self.screen = None
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self.dim = (0, 0)
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self.page_pad = None
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self.status_line = None
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self.command_line = None
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self.running = True
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self.status_data = ("", 0, 0)
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self.history = History(self.config["history_limit"])
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self.cache = {}
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self.special_pages = self.setup_special_pages()
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self.last_download: Optional[Tuple[MimeType, Path]] = None
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self.identities = load_identities(get_identities_list_path()) or {}
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self._current_url = ""
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@property
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def h(self):
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return self.dim[0]
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@property
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def w(self):
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return self.dim[1]
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@property
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def current_url(self):
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"""Return the current URL."""
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return self._current_url
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@current_url.setter
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def current_url(self, url):
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"""Set the current URL and show it in the status line."""
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self._current_url = url
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self.set_status(url)
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@property
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def current_scheme(self):
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"""Return the scheme of the current URL."""
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return parse_url(self._current_url)["scheme"] or ""
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def setup_special_pages(self):
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"""Return a dict with the special pages functions."""
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return {
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"welcome": { "open": self.open_welcome_page },
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"help": { "open": self.open_help },
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"history": { "open": self.open_history },
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"bookmarks": {
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"open": self.open_bookmarks,
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"source": lambda: str(get_bookmarks_path())
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},
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}
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def run(self, *args, **kwargs):
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"""Use curses' wrapper around _run."""
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os.environ.setdefault("ESCDELAY", "25")
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logging.info("Cursing…")
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curses.wrapper(self._run, *args, **kwargs)
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def _run(self, stdscr, start_url=None):
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"""Start displaying content and handling events."""
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self.screen = stdscr
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self.screen.clear()
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self.screen.refresh()
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curses.mousemask(curses.ALL_MOUSE_EVENTS)
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curses.curs_set(0)
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init_colors()
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self.dim = self.screen.getmaxyx()
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self.page_pad = PagePad(self.h - 2)
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self.status_line = self.screen.subwin(
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*self.line_dim,
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*self.status_line_pos,
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)
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command_line_window = self.screen.subwin(
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*self.line_dim,
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*self.command_line_pos,
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)
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self.command_line = CommandLine(
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command_line_window,
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self.config["command_editor"]
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)
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if start_url:
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self.open_url(start_url)
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else:
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self.open_home()
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while self.running:
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try:
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self.handle_inputs()
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except KeyboardInterrupt:
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self.set_status("Cancelled.")
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def handle_inputs(self):
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char = self.screen.getch()
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if char == ord("?"):
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self.open_help()
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elif char == ord(":"):
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self.quick_command("")
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elif char == ord("r"):
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self.reload_page()
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elif char == ord("h"):
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self.scroll_page_horizontally(-3)
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elif char == ord("H"):
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self.scroll_whole_page_left()
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elif char == ord("j"):
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self.scroll_page_vertically(3)
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elif char == ord("J"):
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self.scroll_whole_page_down()
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elif char == ord("k"):
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self.scroll_page_vertically(-3)
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elif char == ord("K"):
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self.scroll_whole_page_up()
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elif char == ord("l"):
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self.scroll_page_horizontally(3)
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elif char == ord("L"):
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self.scroll_whole_page_right()
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elif char == ord("^"):
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self.scroll_page_horizontally(-inf)
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elif char == ord("g"):
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char = self.screen.getch()
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if char == ord("g"):
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self.scroll_page_vertically(-inf)
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elif char == ord("G"):
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self.scroll_page_vertically(inf)
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elif char == ord("o"):
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self.quick_command("open")
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elif char == ord("O"):
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self.open_last_download()
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elif char == ord("p"):
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self.go_back()
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elif char == ord("u"):
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self.go_to_parent_page()
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elif char == ord("U"):
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self.go_to_root_page()
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elif char == ord("b"):
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self.open_bookmarks()
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elif char == ord("B"):
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self.add_bookmark()
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elif char == ord("e"):
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self.edit_page()
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elif char == ord("y"):
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self.open_history()
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elif curses.ascii.isdigit(char):
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self.handle_digit_input(char)
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elif char == curses.KEY_MOUSE:
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self.handle_mouse(*curses.getmouse())
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elif char == curses.KEY_RESIZE:
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self.handle_resize()
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elif char == curses.ascii.ESC: # Can be ESC or ALT char.
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self.screen.nodelay(True)
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char = self.screen.getch()
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if char == -1:
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self.reset_status()
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else: # ALT keybinds.
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if char == ord("h"):
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self.scroll_page_horizontally(-1)
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elif char == ord("j"):
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self.scroll_page_vertically(1)
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elif char == ord("k"):
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self.scroll_page_vertically(-1)
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elif char == ord("l"):
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self.scroll_page_horizontally(1)
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self.screen.nodelay(False)
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# elif char == ord("@"):
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# self.current_url = "bebop:debugzone"
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# t = "\n".join("* " + u for u in self.history.urls)
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# t += "\n\n" + "\n".join("* " + u for u in self.history.backlist)
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# self.load_page(Page.from_text(t))
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# # unctrled = curses.unctrl(char)
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# # if unctrled == b"^T":
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# # self.set_status("test!")
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# pass
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@property
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def page_pad_size(self):
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return self.h - 3, self.w - 1
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@property
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def status_line_pos(self):
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return self.h - 2, 0
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@property
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def command_line_pos(self):
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return self.h - 1, 0
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@property
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def line_dim(self):
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return 1, self.w
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def refresh_windows(self):
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"""Refresh all windows and clear command line."""
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self.refresh_page()
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self.refresh_status_line()
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self.command_line.clear()
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def refresh_page(self):
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"""Refresh the current page pad; it does not reload the page."""
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self.page_pad.refresh_content(*self.page_pad_size)
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def refresh_status_line(self):
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"""Refresh status line contents."""
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text, pair, attributes = self.status_data
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logging.debug("Status: " + text)
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text = text[:self.w - 1]
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color = curses.color_pair(pair)
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self.status_line.addstr(0, 0, text, color | attributes)
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self.status_line.clrtoeol()
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self.status_line.refresh()
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def set_status(self, text):
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"""Set a regular message in the status bar."""
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self.status_data = text, ColorPair.NORMAL, curses.A_ITALIC
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self.refresh_status_line()
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def reset_status(self):
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"""Reset status line, e.g. after a cancelled action."""
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self.set_status(self.current_url)
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def set_status_error(self, text):
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"""Set an error message in the status bar."""
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self.status_data = text, ColorPair.ERROR, 0
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self.refresh_status_line()
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def quick_command(self, command):
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"""Shortcut method to take user input with a prefixed command string."""
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prefix = command + " " if command else ""
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text = self.command_line.focus(CommandLine.CHAR_COMMAND, prefix=prefix)
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if not text:
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return
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self.process_command(text)
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def process_command(self, command_text: str):
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"""Handle a client command."""
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words = command_text.split()
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num_words = len(words)
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if num_words == 0:
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return
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command = words[0]
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if num_words == 1:
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if command in ("q", "quit"):
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self.running = False
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elif command in ("h", "home"):
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self.open_home()
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return
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if command in ("o", "open"):
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self.open_url(words[1])
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elif command == "forget-certificate":
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from bebop.browser.gemini import forget_certificate
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forget_certificate(self, words[1])
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def get_user_text_input(self, status_text, char, prefix="", strip=False):
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"""Get user input from the command-line."""
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self.set_status(status_text)
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result = self.command_line.focus(char, prefix=prefix)
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self.reset_status()
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if strip:
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result = result.strip()
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return result
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def open_url(self, url, base_url=None, redirects=0, history=True,
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use_cache=False):
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"""Try to open an URL.
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This function assumes that the URL can be from an user and thus tries a
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few things to make it work.
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If there is no current URL (e.g. we just started) or `assume_absolute`
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is True, assume it is an absolute URL. In other cases, parse it normally
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and later check if it has to be used relatively to the current URL.
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Arguments:
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- url: an URL string, may not be completely compliant.
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- base_url: an URL string to use as base in case `url` is relative.
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- redirections: number of redirections we did yet for the same request.
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- history: whether the URL should be pushed to history on success.
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- use_cache: whether we should look for an already cached document.
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"""
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if redirects > 5:
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self.set_status_error(f"Too many redirections ({url}).")
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return
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# Take the current scheme as the default scheme to use if the URL does
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# not specify it. If it's the bebop scheme, discard it. If there is no
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# current scheme available, default to the gemini scheme.
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current_scheme = self.current_scheme
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if not current_scheme or current_scheme == "bebop":
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current_scheme = "gemini"
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parts = parse_url(url, default_scheme=current_scheme)
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# If there is no netloc part, try to join the URL.
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if (
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parts["netloc"] is None
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and parts["scheme"] == current_scheme
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and parts["scheme"] not in NO_NETLOC_SCHEMES
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):
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url_is_usable = False
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# Join from either a given base URL, e.g. redirections or following
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# a relative link. If there is no such reference URL, try to guess
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# what the user meant to do.
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if base_url:
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parts = parse_url(join_url(base_url, url))
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url_is_usable = True
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elif parts["scheme"] and parts["path"]:
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guessed_url = parts["scheme"] + "://" + parts["path"]
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if self.prompt(f"Do you mean '{guessed_url}'?") == "y":
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parts = parse_url(guessed_url)
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url_is_usable = True
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# If nothing could be done, just give up.
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if not url_is_usable:
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self.set_status_error(f"Can't open '{url}'.")
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return
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# Replace URL passed as parameter by a sanitized one.
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url = unparse_url(parts)
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scheme = parts["scheme"]
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if scheme == "gemini":
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from bebop.browser.gemini import open_gemini_url
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success = open_gemini_url(
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self,
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url,
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redirects=redirects,
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use_cache=use_cache
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)
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if history and success:
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self.history.push(url)
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elif scheme.startswith("http"):
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from bebop.browser.web import open_web_url
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open_web_url(self, url)
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elif scheme == "file":
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from bebop.browser.file import open_file
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file_url = open_file(self, parts["path"])
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if history and file_url:
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self.history.push(file_url)
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elif scheme == "bebop":
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special_page = self.special_pages.get(parts["path"])
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if special_page:
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special_page["open"]()
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else:
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self.set_status_error("Unknown page.")
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else:
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self.set_status_error(f"Protocol '{scheme}' not supported.")
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def load_page(self, page: Page):
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"""Load Gemtext data as the current page."""
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old_pad_height = self.page_pad.dim[0]
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self.page_pad.show_page(page)
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if self.page_pad.dim[0] < old_pad_height:
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self.screen.clear()
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self.screen.refresh()
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self.refresh_windows()
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else:
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self.refresh_page()
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def handle_digit_input(self, init_char: int):
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"""Focus command-line to select the link ID to follow."""
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if self.page_pad.current_page is None:
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return
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links = self.page_pad.current_page.links
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if links is None:
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return
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err, val = self.command_line.focus_for_link_navigation(init_char, links)
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if err == 0:
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self.open_link(links, val) # type: ignore
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elif err == 2:
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self.set_status_error(val)
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def open_link(self, links: Links, link_id: int):
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"""Open the link with this link ID."""
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if not link_id in links:
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self.set_status_error(f"Unknown link ID {link_id}.")
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return
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self.open_url(links[link_id], base_url=self.current_url)
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def handle_mouse(self, mouse_id: int, x: int, y: int, z: int, bstate: int):
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"""Handle mouse events.
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Right now, only vertical scrolling is handled.
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"""
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if bstate & ButtonState.SCROLL_UP:
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self.scroll_page_vertically(-3)
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elif bstate & ButtonState.SCROLL_DOWN:
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self.scroll_page_vertically(3)
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def handle_resize(self):
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"""Try to not make everything collapse on resizes."""
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# Refresh the whole screen before changing windows to avoid random
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# blank screens.
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self.screen.refresh()
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old_dim = self.dim
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self.dim = self.screen.getmaxyx()
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# Avoid work if the resizing does not impact us.
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if self.dim == old_dim:
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return
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# Resize windows to fit the new dimensions. Content pad will be updated
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# on its own at the end of the function.
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self.status_line.resize(*self.line_dim)
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self.command_line.window.resize(*self.line_dim)
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# Move the windows to their new position if that's still possible.
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if self.status_line_pos[0] >= 0:
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self.status_line.mvwin(*self.status_line_pos)
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if self.command_line_pos[0] >= 0:
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self.command_line.window.mvwin(*self.command_line_pos)
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# If the content pad does not fit its whole place, we have to clean the
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# gap between it and the status line. Refresh all screen.
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if self.page_pad.dim[0] < self.h - 2:
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self.screen.clear()
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self.screen.refresh()
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self.refresh_windows()
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def scroll_page_vertically(self, by_lines):
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"""Scroll page vertically.
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If `by_lines` is an integer (positive or negative), scroll the page by
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this amount of lines. If `by_lines` is one of the floats inf and -inf,
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go to the end of file and beginning of file, respectively.
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"""
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window_height = self.h - 2
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require_refresh = False
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if by_lines == inf:
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require_refresh = self.page_pad.go_to_end(window_height)
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elif by_lines == -inf:
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require_refresh = self.page_pad.go_to_beginning()
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else:
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require_refresh = self.page_pad.scroll_v(by_lines, window_height)
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if require_refresh:
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self.refresh_page()
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def scroll_whole_page_down(self):
|
|
"""Scroll down by a whole page."""
|
|
self.scroll_page_vertically(self.page_pad_size[0])
|
|
|
|
def scroll_whole_page_up(self):
|
|
"""Scroll up by a whole page."""
|
|
self.scroll_page_vertically(-self.page_pad_size[0])
|
|
|
|
def scroll_page_horizontally(self, by_columns):
|
|
"""Scroll page horizontally.
|
|
|
|
If `by_lines` is an integer (positive or negative), scroll the page by
|
|
this amount of columns. If `by_lines` is -inf, scroll back to the first
|
|
column. Scrolling to the right-most column is not supported.
|
|
"""
|
|
if by_columns == -inf:
|
|
require_refresh = self.page_pad.go_to_first_column()
|
|
else:
|
|
require_refresh = self.page_pad.scroll_h(by_columns, self.w)
|
|
if require_refresh:
|
|
self.refresh_page()
|
|
|
|
def scroll_whole_page_left(self):
|
|
"""Scroll left by a whole page."""
|
|
self.scroll_page_horizontally(-self.page_pad_size[1])
|
|
|
|
def scroll_whole_page_right(self):
|
|
"""Scroll right by a whole page."""
|
|
self.scroll_page_horizontally(self.page_pad_size[1])
|
|
|
|
def reload_page(self):
|
|
"""Reload the page, if one has been previously loaded."""
|
|
if self.current_url:
|
|
self.open_url(self.current_url, history=False, use_cache=False)
|
|
|
|
def go_back(self):
|
|
"""Go back in history if possible."""
|
|
if self.current_url.startswith("bebop:"):
|
|
previous_url = self.history.get_previous(actual_previous=True)
|
|
else:
|
|
previous_url = self.history.get_previous()
|
|
if previous_url:
|
|
self.open_url(previous_url, history=False, use_cache=True)
|
|
|
|
def go_to_parent_page(self):
|
|
"""Go to the parent URL if possible."""
|
|
if self.current_url:
|
|
self.open_url(get_parent_url(self.current_url))
|
|
|
|
def go_to_root_page(self):
|
|
"""Go to the root URL if possible."""
|
|
if self.current_url:
|
|
self.open_url(get_root_url(self.current_url))
|
|
|
|
def open_internal_page(self, name, gemtext):
|
|
"""Open some content corresponding to a "bebop:" internal URL."""
|
|
page = Page.from_gemtext(gemtext, self.config["text_width"])
|
|
self.load_page(page)
|
|
self.current_url = "bebop:" + name
|
|
|
|
def open_bookmarks(self):
|
|
"""Open bookmarks."""
|
|
content = get_bookmarks_document()
|
|
if content is None:
|
|
self.set_status_error("Failed to open bookmarks.")
|
|
return
|
|
self.open_internal_page("bookmarks", content)
|
|
|
|
def add_bookmark(self):
|
|
"""Add the current URL as bookmark."""
|
|
if not self.current_url:
|
|
return
|
|
current_title = self.page_pad.current_page.title or ""
|
|
title = self.get_user_text_input(
|
|
"Bookmark title?",
|
|
CommandLine.CHAR_TEXT,
|
|
prefix=current_title,
|
|
strip=True,
|
|
)
|
|
if title:
|
|
save_bookmark(self.current_url, title)
|
|
|
|
def edit_page(self):
|
|
"""Open a text editor to edit the page source.
|
|
|
|
For external pages, the source is written in a temporary file, opened in
|
|
its editor of choice and so it's up to the user to save it where she
|
|
needs it, if needed. Internal pages, e.g. the bookmarks page, are loaded
|
|
directly from their location on disk.
|
|
"""
|
|
delete_source_after = False
|
|
parts = parse_url(self.current_url)
|
|
if parts["scheme"] == "bebop":
|
|
page_name = parts["path"]
|
|
special_pages_functions = self.special_pages.get(page_name)
|
|
if not special_pages_functions:
|
|
return
|
|
get_source = special_pages_functions.get("source")
|
|
source_filename = get_source() if get_source else None
|
|
else:
|
|
if not self.page_pad.current_page:
|
|
return
|
|
source = self.page_pad.current_page.source
|
|
with tempfile.NamedTemporaryFile("wt", delete=False) as source_file:
|
|
source_file.write(source)
|
|
source_filename = source_file.name
|
|
delete_source_after = True
|
|
|
|
if not source_filename:
|
|
return
|
|
|
|
command = self.config["source_editor"] + [source_filename]
|
|
open_external_program(command)
|
|
if delete_source_after:
|
|
os.unlink(source_filename)
|
|
self.refresh_windows()
|
|
|
|
def open_help(self):
|
|
"""Show the help page."""
|
|
self.open_internal_page("help", get_help(self.config))
|
|
|
|
def prompt(self, text: str, keys: str ="yn"):
|
|
"""Display the text and allow it to type one of the given keys."""
|
|
choice = "/".join(keys)
|
|
self.set_status(f"{text} [{choice}]")
|
|
return self.command_line.prompt_key(keys)
|
|
|
|
def open_history(self):
|
|
"""Show a generated history of visited pages."""
|
|
self.open_internal_page("history", self.history.to_gemtext())
|
|
|
|
def open_last_download(self):
|
|
"""Open the last downloaded file."""
|
|
if not self.last_download:
|
|
return
|
|
mime_type, path = self.last_download
|
|
command = self.config["external_commands"].get(mime_type.main_type)
|
|
if not command:
|
|
command = self.config["external_command_default"]
|
|
command = command + [str(path)]
|
|
self.set_status(f"Running '{' '.join(command)}'...")
|
|
try:
|
|
subprocess.Popen(
|
|
command,
|
|
stdout=subprocess.DEVNULL,
|
|
stderr=subprocess.DEVNULL,
|
|
start_new_session=True
|
|
)
|
|
except FileNotFoundError as exc:
|
|
self.set_status_error(f"Failed to run command: {exc}")
|
|
|
|
def open_home(self):
|
|
"""Open the home page."""
|
|
self.open_url(self.config["home"])
|
|
|
|
def open_welcome_page(self):
|
|
"""Open the default welcome page."""
|
|
self.open_internal_page("welcome", WELCOME_PAGE)
|