460 lines
17 KiB
Python
460 lines
17 KiB
Python
import curses
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import curses.ascii
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import curses.textpad
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import os
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from math import inf
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from webbrowser import open_new_tab
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from bebop.colors import ColorPair, init_colors
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from bebop.command_line import (CommandLine, EscapeCommandInterrupt,
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TerminateCommandInterrupt)
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from bebop.history import History
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from bebop.mouse import ButtonState
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from bebop.navigation import join_url, parse_url, sanitize_url, set_parameter
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from bebop.page import Page
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from bebop.protocol import Request, Response
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class Browser:
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"""Manage the events, inputs and rendering."""
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def __init__(self, cert_stash):
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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.tab = None
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self.status_line = None
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self.command_line = None
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self.status_data = ("", 0)
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self.current_url = ""
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self.running = True
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self.history = History()
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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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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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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 = Page(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(command_line_window)
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pending_url = start_url
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while self.running:
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if pending_url:
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self.open_url(pending_url)
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pending_url = None
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char = self.screen.getch()
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if 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("s"):
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self.set_status(f"h {self.h} w {self.w}")
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elif char == ord("h"):
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self.scroll_page_horizontally(-1)
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elif char == ord("H"):
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self.scroll_page_horizontally(-3)
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elif char == ord("j"):
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self.scroll_page_vertically(1)
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elif char == ord("J"):
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self.scroll_page_vertically(3)
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elif char == ord("k"):
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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(-3)
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elif char == ord("l"):
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self.scroll_page_horizontally(1)
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elif char == ord("L"):
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self.scroll_page_horizontally(3)
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elif char == ord("f"):
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self.scroll_page_vertically(self.page_pad_size[0])
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elif char == ord("b"):
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self.scroll_page_vertically(-self.page_pad_size[0])
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elif char == ord("o"):
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self.quick_command("open")
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elif char == ord("p"):
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self.go_back()
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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 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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@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.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 = self.status_data
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text = text[:self.w - 1]
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self.status_line.addstr(0, 0, text, curses.color_pair(pair))
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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
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self.refresh_status_line()
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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
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self.refresh_status_line()
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def open_url(self, url, base_url=None, redirects=0, assume_absolute=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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- assume_absolute: assume we intended to use an absolute URL if True.
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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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if assume_absolute or not self.current_url:
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parts = parse_url(url, absolute=True)
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join = False
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else:
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parts = parse_url(url)
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join = True
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if parts.scheme == "gemini":
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# If there is no netloc, this is a relative URL.
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if join or base_url:
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url = join_url(base_url or self.current_url, url)
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self.open_gemini_url(sanitize_url(url), redirects)
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elif parts.scheme.startswith("http"):
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self.open_web_url(url)
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else:
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self.set_status_error(f"Protocol {parts.scheme} not supported.")
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def open_gemini_url(self, url, redirects=0, history=True):
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"""Open a Gemini URL and set the formatted response as content."""
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self.set_status(f"Loading {url}")
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req = Request(url, self.stash)
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connected = req.connect()
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if not connected:
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if req.state == Request.STATE_ERROR_CERT:
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error = f"Certificate was missing or corrupt ({url})."
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self.set_status_error(error)
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elif req.state == Request.STATE_UNTRUSTED_CERT:
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self.set_status_error(f"Certificate has been changed ({url}).")
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# TODO propose the user ways to handle this.
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elif req.state == Request.STATE_CONNECTION_FAILED:
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error = f": {req.error}" if req.error else "."
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self.set_status_error(f"Connection failed ({url}){error}")
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else:
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self.set_status_error(f"Connection failed ({url}).")
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return
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if req.state == Request.STATE_INVALID_CERT:
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# TODO propose abort / temp trust
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pass
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elif req.state == Request.STATE_UNKNOWN_CERT:
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# TODO propose abort / temp trust / perm trust
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pass
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else:
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pass # TODO
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response = Response.parse(req.proceed())
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if not response:
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self.set_status_error(f"Server response parsing failed ({url}).")
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return
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if response.code == 20:
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self.load_page(response.content)
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if self.current_url and history:
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self.history.push(self.current_url)
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self.current_url = url
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self.set_status(url)
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elif response.generic_code == 30 and response.meta:
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self.open_url(response.meta, base_url=url, redirects=redirects + 1)
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elif response.generic_code in (40, 50):
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error = f"Server error: {response.meta or Response.code.name}"
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self.set_status_error(error)
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elif response.generic_code == 10:
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self.handle_input_request(url, response)
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def load_page(self, gemtext: bytes):
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"""Load Gemtext data as the current page."""
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old_pad_height = self.page.dim[0]
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self.page.show_gemtext(gemtext)
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if self.page.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 take_user_input(self, type_char: str =":", prefix: str =""):
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"""Focus command line to let the user type something."""
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return self.command_line.focus(
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type_char,
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validator=self.validate_common_char,
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prefix=prefix,
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)
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def validate_common_char(self, ch: int):
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"""Generic input validator, handles a few more cases than default.
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This validator can be used as a default validator as it handles, on top
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of the Textbox defaults:
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- Erasing the first command char, i.e. clearing the line, cancels the
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command input.
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- Pressing ESC also cancels the input.
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This validator can be safely called at the beginning of other validators
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to handle the keys above.
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"""
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if ch == curses.KEY_BACKSPACE: # Cancel input if all line is cleaned.
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text = self.command_line.gather()
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if len(text) == 0:
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raise EscapeCommandInterrupt()
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elif ch == curses.ascii.ESC: # Could be ESC or ALT
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self.screen.nodelay(True)
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ch = self.screen.getch()
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if ch == -1:
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raise EscapeCommandInterrupt()
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self.screen.nodelay(False)
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return ch
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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 = f"{command} " if command else ""
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user_input = self.take_user_input(prefix=prefix)
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if not user_input:
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return
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self.process_command(user_input)
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def process_command(self, command_text: str):
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words = command_text.split()
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command = words[0]
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if command in ("o", "open"):
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self.open_url(words[1], assume_absolute=True)
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elif command in ("q", "quit"):
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self.running = False
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def handle_digit_input(self, init_char: int):
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"""Handle a initial digit input by the user.
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When a digit key is pressed, the user intents to visit a link (or
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dropped something on the numpad). To reduce the number of key types
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needed, Bebop uses the following algorithm:
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- If the current user input identifies a link without ambiguity, it is
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used directly.
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- If it is ambiguous, the user either inputs as many digits required
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to disambiguate the link ID, or press enter to validate her input.
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Examples:
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- I have 3 links. Pressing "2" takes me to link 2.
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- I have 15 links. Pressing "3" takes me to link 3 (no ambiguity).
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- I have 15 links. Pressing "1" and "2" takes me to link 12.
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- I have 456 links. Pressing "1", "2" and Enter takes me to link 12.
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- I have 456 links. Pressing "1", "2" and "6" takes me to link 126.
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"""
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digit = init_char & 0xf
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links = self.page.links
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num_links = len(links)
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# If there are less than 10 links, just open it now.
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if num_links < 10:
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self.open_link(links, digit)
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return
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# Else check if the digit alone is sufficient.
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digit = chr(init_char)
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max_digits = 0
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while num_links:
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max_digits += 1
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num_links //= 10
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disambiguous = self.disambiguate_link_id(digit, links, max_digits)
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if disambiguous is not None:
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self.open_link(links, disambiguous)
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return
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# Else, focus the command line to let the user input more digits.
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validator = lambda ch: self._validate_link_digit(ch, links, max_digits)
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link_input = self.command_line.focus("&", validator, digit)
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if not link_input:
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return
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try:
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link_id = int(link_input)
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except ValueError as exc:
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self.set_status_error(f"Invalid link ID {link_input}.")
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return
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self.open_link(links, link_id)
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def _validate_link_digit(self, ch: int, links, max_digits: int):
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"""Handle input chars to be used as link ID."""
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# Handle common chars.
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ch = self.validate_common_char(ch)
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# Only accept digits. If we reach the amount of required digits, open
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# link now and leave command line. Else just process it.
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if curses.ascii.isdigit(ch):
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digits = self.command_line.gather() + chr(ch)
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disambiguous = self.disambiguate_link_id(digits, links, max_digits)
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if disambiguous is not None:
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raise TerminateCommandInterrupt(disambiguous)
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return ch
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# If not a digit but a printable character, ignore it.
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if curses.ascii.isprint(ch):
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return 0
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# Everything else could be a control character and should be processed.
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return ch
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def disambiguate_link_id(self, digits: str, links, max_digits: int):
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"""Return the only possible link ID as str, or None on ambiguities."""
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if len(digits) == max_digits:
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return int(digits)
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candidates = [
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link_id for link_id, url in links.items()
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if str(link_id).startswith(digits)
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]
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return candidates[0] if len(candidates) == 1 else None
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def open_link(self, 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])
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def handle_input_request(self, from_url: str, response: Response):
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if response.meta:
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self.set_status(f"Input needed: {response.meta}")
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else:
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self.set_status("Input needed:")
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user_input = self.take_user_input("?")
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if user_input:
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url = set_parameter(from_url, user_input)
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self.open_gemini_url(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.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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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.go_to_end(window_height)
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elif by_lines == -inf:
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require_refresh = self.page.go_to_beginning()
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else:
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require_refresh = self.page.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_page_horizontally(self, by_columns):
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if self.page.scroll_h(by_columns, self.w):
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self.refresh_page()
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def reload_page(self):
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if self.current_url:
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self.open_gemini_url(self.current_url, history=False)
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def go_back(self):
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"""Go back in history if possible."""
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if self.history.has_links():
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self.open_gemini_url(self.history.pop(), history=False)
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def open_web_url(self, url):
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"""Open a Web URL. Currently relies in Python's webbrowser module."""
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self.set_status(f"Opening {url}")
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open_new_tab(url)
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