kovidgoyal/kitty
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Implement the alternate screen buffer

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This commit is contained in:
Kovid Goyal 2016-10-21 06:58:34 +05:30
parent 369bb39d2a
commit 682400c3e7
2 changed files with 36 additions and 17 deletions
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50
kitty/screen.py
View File

@ -56,12 +56,14 @@ def __init__(self, opts, tracker, columns: int=80, lines: int=24, parent=None):
self.write_process_input = self.write_to_child.emit
for attr in 'cursor_changed cursor_position_changed update_screen update_line_range update_cell_range line_added_to_history'.split():
setattr(self, attr, getattr(tracker, attr))
self.savepoints = deque()
self.main_savepoints, self.alt_savepoints = deque(), deque()
self.savepoints = self.main_savepoints
self.columns = columns
self.lines = lines
self.linebuf = []
sz = max(1000, opts.scrollback_lines)
self.tophistorybuf = deque(maxlen=sz)
self.main_linebuf, self.alt_linebuf = list(Line(self.columns) for i in range(self.lines)), list(Line(self.columns) for i in range(self.lines))
self.linebuf = self.main_linebuf
self.reset()
def apply_opts(self, opts):
@ -127,23 +129,23 @@ def resize(self, lines: int, columns: int):
mode and screen margins, see ``xterm/screen.c:1761``.
"""
self.lines, self.columns = lines, columns
for hb in (self.tophistorybuf, ):
old = hb.copy()
hb.clear(), hb.extend(rewrap_lines(old, columns))
old_lines = self.linebuf[:]
self.linebuf.clear()
self.lines, self.columns = lines, columns
self.linebuf[:] = rewrap_lines(old_lines, self.columns)
if (len(self.linebuf) > self.lines):
extra = len(self.linebuf) - self.lines
self.tophistorybuf.extend(self.linebuf[:extra])
del self.linebuf[:extra]
while len(self.linebuf) < self.lines:
self.linebuf.append(Line(self.columns))
extra = len(self.linebuf) - self.lines
if extra > 0:
self.tophistorybuf.extend(self.linebuf[:extra])
del self.linebuf[:extra]
for lb in (self.main_linebuf, self.alt_linebuf):
old_lines = lb[:]
lb.clear()
lb[:] = rewrap_lines(old_lines, self.columns)
while len(lb) < self.lines:
lb.append(Line(self.columns))
if len(lb) > self.lines:
extra = len(lb) - self.lines
slc = lb[:extra]
del lb[:extra]
if lb is self.main_linebuf:
self.tophistorybuf.extend(slc)
self.margins = Margins(0, self.lines - 1)
self._notify_cursor_position = False
try:
@ -222,6 +224,12 @@ def set_mode(self, *modes, private=False):
if previous != self.cursor.hidden:
self.cursor_changed(self.cursor)
if mo.ALTERNATE_SCREEN in self.mode and self.linebuf is self.main_linebuf:
self.save_cursor()
self.linebuf, self.savepoints = self.alt_linebuf, self.alt_savepoints
self.restore_cursor()
self.update_screen()
@property
def in_bracketed_paste_mode(self):
return mo.BRACKETED_PASTE in self.mode
@ -265,6 +273,12 @@ def reset_mode(self, *modes, private=False):
if previous != self.cursor.hidden:
self.cursor_changed(self.cursor)
if mo.ALTERNATE_SCREEN not in self.mode and self.linebuf is not self.main_linebuf:
self.save_cursor()
self.linebuf, self.savepoints = self.main_linebuf, self.main_savepoints
self.restore_cursor()
self.update_screen()
def define_charset(self, code, mode):
"""Defines ``G0`` or ``G1`` charset.
@ -432,7 +446,9 @@ def index(self):
top, bottom = self.margins
if self.cursor.y == bottom:
self.tophistorybuf.append(self.linebuf.pop(top))
l = self.linebuf.pop(top)
if self.linebuf is self.main_linebuf:
self.tophistorybuf.append(l)
self.linebuf.insert(bottom, Line(self.columns))
self.line_added_to_history()
self.update_screen()

3
pyte/modes.py
View File

@ -65,6 +65,9 @@
BRACKETED_PASTE_START = '\033[200~'.encode('ascii')
BRACKETED_PASTE_END = '\033[201~'.encode('ascii')
#: Alternate screen buffer
ALTERNATE_SCREEN = 1049 << 5
#: Xterm mouse protocol
SEND_MOUSE_ON_PRESS_AND_RELEASE = 1000 << 5
HILITE_MOUSE_TRACKING = 1001 << 5