ranger - mirror of ranger - a simple, vim-like file manager

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""" The pager displays text and allows you to scroll inside it. """ from . import Widget from ranger.container.commandlist import CommandList from ranger.ext.move import move_between class Pager(Widget): source = None source_is_stream = False old_source = None old_scroll_begin = 0 old_startx = 0 def __init__(self, win, embedded=False): Widget.__init__(self, win) self.embedded = embedded self.scroll_begin = 0 self.startx = 0 self.lines = [] self.commandlist = CommandList() if embedded: keyfnc = self.settings.keys.initialize_embedded_pager_commands else: keyfnc = self.settings.keys.initialize_pager_commands keyfnc(self.commandlist) def open(self): self.scroll_begin = 0 self.startx = 0 self.need_redraw = True def close(self): if self.source and self.source_is_stream: self.source.close() def draw(self): if self.old_source != self.source: self.old_source = self.source self.need_redraw = True if self.old_scroll_begin != self.scroll_begin or \ self.old_startx != self.startx: self.old_startx = self.startx self.old_scroll_begin = self.scroll_begin self.need_redraw = True if self.need_redraw: self.win.erase() line_gen = self._generate_lines( starty=self.scroll_begin, startx=self.startx) for line, i in zip(line_gen, range(self.hei)): try: self.addstr(i, 0, line) except TypeError: pass self.need_redraw = False def move(self, relative=0, absolute=None, pages=None, narg=None): i = self.scroll_begin if isinstance(absolute, int): if isinstance(narg, int): absolute = narg if absolute < 0: i = absolute + len(self.lines) else: i = absolute if relative != 0: if isinstance(pages, int): relative *= pages * self.hei if isinstance(narg, int): relative *= narg i = int(i + relative) length = len(self.lines) - self.hei if i >= length: self._get_line(i+self.hei) length = len(self.lines) - self.hei if i >= length: i = length if i < 0: i = 0 self.scroll_begin = i def move_horizontal(self, relative=0, absolute=None): self.startx = move_between( current=self.startx, minimum=0, maximum=999, relative=relative, absolute=absolute) def press(self, key): try: tup = self.env.keybuffer.tuple_without_numbers() if tup: cmd = self.commandlist[tup] else: return except KeyError: self.env.key_clear() else: if hasattr(cmd, 'execute'): cmd.execute_wrap(self) self.env.key_clear() def set_source(self, source, strip=False): if self.source and self.source_is_stream: self.source.close() if isinstance(source, str): self.source_is_stream = False self.lines = source.split('\n') elif hasattr(source, '__getitem__'): self.source_is_stream = False self.lines = source elif hasattr(source, 'readline'): self.source_is_stream = True self.lines = [] else: self.source = None self.source_is_stream = False return False if not self.source_is_stream and strip: self.lines = map(lambda x: x.strip(), self.lines) self.source = source return True def click(self, event): n = event.ctrl() and 1 or 3 if event.pressed(4): self.move(relative = -n) elif event.pressed(2) or event.key_invalid(): self.move(relative = n) return True def _get_line(self, n, attempt_to_read=True): try: return self.lines[n] except (KeyError, IndexError): if attempt_to_read and self.source_is_stream: try: for l in self.source: self.lines.append(l) if len(self.lines) > n: break except UnicodeError: pass return self._get_line(n, attempt_to_read=False) return "" def _generate_lines(self, starty, startx): i = starty if not self.source: raise StopIteration while True: try: line = self._get_line(i).expandtabs(4) line = line[startx:self.wid - 1 + startx].rstrip() yield line except IndexError: raise StopIteration i += 1


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