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# Copyright (C) 2009, 2010 Roman Zimbelmann <romanz@lavabit.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
The pager displays text and allows you to scroll inside it.
"""
import re
from . import Widget
from ranger.ext.direction import Direction
from ranger.container.keymap import CommandArgs
BAR_REGEXP = re.compile(r'\|\d+\?\|')
QUOTES_REGEXP = re.compile(r'"[^"]+?"')
SPECIAL_CHARS_REGEXP = re.compile(r'<\w+>|\^[A-Z]')
TITLE_REGEXP = re.compile(r'^\d+\.')
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.markup = None
self.lines = []
def open(self):
self.scroll_begin = 0
self.markup = None
self.startx = 0
self.need_redraw = True
def close(self):
if self.source and self.source_is_stream:
self.source.close()
def finalize(self):
self.fm.ui.win.move(self.y, self.x)
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)):
self._draw_line(i, line)
self.need_redraw = False
def _draw_line(self, i, line):
if self.markup is None:
self.addstr(i, 0, line)
elif self.markup is 'help':
self.addstr(i, 0, line)
baseclr = ('in_pager', 'help_markup')
if line.startswith('===='):
self.color_at(i, 0, len(line), 'seperator', *baseclr)
return
if line.startswith(' ') and \
len(line) >= 16 and line[15] == ' ':
self.color_at(i, 0, 16, 'key', *baseclr)
for m in BAR_REGEXP.finditer(line):
start, length = m.start(), m.end() - m.start()
self.color_at(i, start, length, 'bars', *baseclr)
self.color_at(i, start + 1, length - 2, 'link', *baseclr)
for m in QUOTES_REGEXP.finditer(line):
start, length = m.start(), m.end() - m.start()
self.color_at(i, start, length, 'quotes', *baseclr)
self.color_at(i, start + 1, length - 2, 'text', *baseclr)
for m in SPECIAL_CHARS_REGEXP.finditer(line):
start, length = m.start(), m.end() - m.start()
self.color_at(i, start, length, 'special', *baseclr)
if TITLE_REGEXP.match(line):
self.color_at(i, 0, -1, 'title', *baseclr)
def move(self, narg=None, **kw):
direction = Direction(kw)
if direction.horizontal():
self.startx = direction.move(
direction=direction.right(),
override=narg,
maximum=self._get_max_width(),
current=self.startx,
pagesize=self.wid,
offset=-self.wid)
if direction.vertical():
if self.source_is_stream:
self._get_line(self.scroll_begin + self.hei * 2)
self.scroll_begin = direction.move(
direction=direction.down(),
override=narg,
maximum=len(self.lines),
current=self.scroll_begin,
pagesize=self.hei,
offset=-self.hei)
def press(self, key):
self.env.keymanager.use_context(self.embedded and 'embedded_pager' or 'pager')
self.env.key_append(key)
kbuf = self.env.keybuffer
cmd = kbuf.command
if kbuf.failure:
kbuf.clear()
return
elif not cmd:
return
self.env.cmd = cmd
if cmd.function:
try:
cmd.function(CommandArgs.from_widget(self))
except Exception as error:
self.fm.notify(error)
if kbuf.done:
kbuf.clear()
else:
kbuf.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
direction = event.mouse_wheel_direction()
if direction:
self.move(down=direction * n)
return True
def _get_line(self, n, attempt_to_read=True):
assert isinstance(n, int), n
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 + startx].rstrip()
yield line
except IndexError:
raise StopIteration
i += 1
def _get_max_width(self):
return max(len(line) for line in self.lines)
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