def pause_scroll_for_user_input(self):
# TODO: mark last paused line, set it up so such lines get
# marked with a plus when still in the buffer, to help your
# eye track the scroll.
self.flush()
if not buf_empty(self.textBuf):
term_width, term_height = term.get_size()
if term_width - self.env.hdr.screen_width_units > 0:
term.home_cursor()
term.cursor_down(term_height - 1)
# we reserve a one unit right margin for this status char
term.cursor_right(self.env.hdr.screen_width_units)
term.write_char_with_color('+', self.env.fg_color,
self.env.bg_color)
term.getch_or_esc_seq()
self.update_seen_lines()
def scroll(self, count_lines=True):
env = self.env
if not self.seenBuf[self.textBuf[env.top_window_height]]:
if not buf_empty(self.textBuf[env.top_window_height:]):
self.pause_scroll_for_user_input()
old_line = self.textBuf.pop(env.top_window_height)
term.home_cursor()
self.overwrite_line_with(old_line)
term.scroll_down()
new_line = self.make_screen_line()
self.textBuf.append(new_line)
self.seenBuf[new_line] = False
self.haveNotScrolled = False
self.slow_scroll_effect()
def scroll_top_line_only(self):
env = self.env
old_line = self.textBuf[env.top_window_height]
# avoid some moderately rare shifting text glitches (when possible)
if self.haveNotScrolled and line_empty(old_line):
return
if not self.seenBuf[old_line] and not line_empty(old_line):
self.pause_scroll_for_user_input()
term.home_cursor()
self.overwrite_line_with(old_line)
term.scroll_down()
new_line = self.make_screen_line()
self.textBuf[env.top_window_height] = new_line
self.seenBuf[new_line] = False
self.haveNotScrolled = False
def first_draw(self):
env = self.env
for i in range(env.hdr.screen_height_units - 1):
write_char('\n', env.fg_color, env.bg_color, env.text_style)
term.fill_to_eol_with_bg_color()
term.home_cursor()
def get_line_of_input(self, prompt='', prefilled=''):
env = self.env
for c in prompt:
self.write_unwrapped(
[ScreenChar(c, env.fg_color, env.bg_color, env.text_style)])
self.flush()
self.update_seen_lines()
row, col = env.cursor[env.current_window]
term.home_cursor()
term.cursor_down(row)
term.cursor_right(col)
term.set_color(env.fg_color, env.bg_color)
if line_empty(self.textBuf[row][col:]):
term.fill_to_eol_with_bg_color()
term.show_cursor()
col = max(
0, col - len(prefilled)
) # TODO: prefilled is a seldom-used old and crusty feature, but make unicode safe
env.cursor[env.current_window] = row, col
class CursorLine(object):
def __init__(self, cursor_start, chars):
self.cursor = cursor_start
self.chars = chars
def backspace(self):
if self.cursor == 0:
return
self.left()
self.delete_char()
def delete_char(self):
del self.chars[self.cursor:self.cursor + 1]
self.refresh_rest_of_line(is_delete=True)
def refresh_rest_of_line(self, is_delete=False):
rest = self.chars[self.cursor:]
term.puts(''.join(rest))
to_back_up = len(rest)
if is_delete:
term.puts(' ')
to_back_up += 1
if to_back_up:
term.cursor_left(to_back_up)
def left(self):
if self.cursor > 0:
self.cursor -= 1
term.cursor_left()
def right(self):
if self.cursor < len(self.chars):
self.cursor += 1
term.cursor_right()
def home(self):
while self.cursor > 0:
self.left()
def end(self):
while self.cursor != len(self.chars):
self.right()
def kill_left(self):
while self.chars[:self.cursor]:
self.backspace()
def kill_right(self):
while self.chars[self.cursor:]:
self.delete_char()
def insert(self, c):
self.chars.insert(self.cursor, c)
term.puts(c)
self.cursor += 1
self.refresh_rest_of_line()
cursor_start = len(prefilled)
cursor_line = CursorLine(cursor_start, [c for c in prefilled])
max_input_len = 120 # 120 char limit seen on gargoyle
c = term.getch_or_esc_seq()
while c != '\n' and c != '\r':
if c == '\b' or c == '\x7f':
cursor_line.backspace()
# normal edit keys and a bit of readline flavor
# left arrow or C-b
elif c == '\x1b[D' or c == '\x02':
cursor_line.left()
# right arrow or C-f
elif c == '\x1b[C' or c == '\x06':
cursor_line.right()
# home or C-a
elif c == '\x1b[H' or c == '\x01':
cursor_line.home()
# end or C-e
elif c == '\x1b[F' or c == '\x05':
cursor_line.end()
# delete or C-d
elif c == '\x1b[3~' or c == '\x04':
cursor_line.delete_char()
# C-u, kill left of cursor
elif c == '\x15':
cursor_line.kill_left()
# C-u, kill right of cursor
elif c == '\x0b':
cursor_line.kill_right()
else:
if is_valid_inline_char(c) and len(
cursor_line.chars) < max_input_len:
if c == '\t':
if len(cursor_line.chars) + 4 <= max_input_len:
for i in range(4):
cursor_line.insert(' ')
else:
cursor_line.insert(c)
c = term.getch_or_esc_seq()
term.hide_cursor()
term.flush()
for c in cursor_line.chars:
self.write_unwrapped(
[ScreenChar(c, env.fg_color, env.bg_color, env.text_style)])
self.new_line_via_spaces(env.fg_color, env.bg_color, env.text_style)
term.home_cursor()
return ''.join(cursor_line.chars)