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reprint.py
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reprint.py
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# -*- coding: utf-8 -*-
# Reprint: reprint is a Python 2/3 module for binding variables and refreshing multi-line output in terminal.
# https://github.com/Yinzo/reprint
from __future__ import print_function, division, unicode_literals
import re
import sys
import time
import threading
from math import ceil
import six
if six.PY2:
from backports.shutil_get_terminal_size import get_terminal_size
input = raw_input
else:
from shutil import get_terminal_size
from builtins import input
last_output_lines = 0
overflow_flag = False
is_atty = sys.stdout.isatty()
magic_char = "\033[F"
widths = [
(126, 1), (159, 0), (687, 1), (710, 0), (711, 1),
(727, 0), (733, 1), (879, 0), (1154, 1), (1161, 0),
(4347, 1), (4447, 2), (7467, 1), (7521, 0), (8369, 1),
(8426, 0), (9000, 1), (9002, 2), (11021, 1), (12350, 2),
(12351, 1), (12438, 2), (12442, 0), (19893, 2), (19967, 1),
(55203, 2), (63743, 1), (64106, 2), (65039, 1), (65059, 0),
(65131, 2), (65279, 1), (65376, 2), (65500, 1), (65510, 2),
(120831, 1), (262141, 2), (1114109, 1),
]
def get_char_width(char):
global widths
o = ord(char)
if o == 0xe or o == 0xf:
return 0
for num, wid in widths:
if o <= num:
return wid
return 1
def width_cal_preprocess(content):
"""
This function also remove ANSI escape code to avoid the influence on line width calculation
"""
ptn = re.compile(r'(\033|\x1b)\[.*?m', re.I)
_content = re.sub(ptn, '', content) # remove ANSI escape code
return _content
def preprocess(content):
"""
do pre-process to the content, turn it into str (for py3), and replace \r\t\n with space
"""
if six.PY2:
if not isinstance(content, unicode):
if isinstance(content, str):
_content = unicode(content, encoding=sys.stdin.encoding)
elif isinstance(content, int):
_content = unicode(content)
else:
_content = content
assert isinstance(_content, unicode)
elif six.PY3:
_content = str(content)
_content = re.sub(r'\r|\t|\n', ' ', _content)
return _content
def cut_off_at(content, width):
if line_width(content) > width:
now = content[:width]
while line_width(now) > width:
now = now[:-1]
now += "$" * (width - line_width(now))
return now
else:
return content
def print_line(content, columns, force_single_line):
padding = " " * ((columns - line_width(content)) % columns)
output = "{content}{padding}".format(content=content, padding=padding)
if force_single_line:
output = cut_off_at(output, columns)
print(output, end='')
sys.stdout.flush()
def line_width(line):
"""
calculate the width of output in terminal
"""
if six.PY2:
assert isinstance(line, unicode)
_line = width_cal_preprocess(line)
result = sum(map(get_char_width, _line))
return result
def lines_of_content(content, width):
"""
calculate the actual rows with specific terminal width
"""
result = 0
if isinstance(content, list):
for line in content:
_line = preprocess(line)
result += ceil(line_width(_line) / width)
elif isinstance(content, dict):
for k, v in content.items():
# adding 2 for the for the colon and space ": "
_k, _v = map(preprocess, (k, v))
result += ceil((line_width(_k) + line_width(_v) + 2) / width)
return int(result)
def print_multi_line(content, force_single_line, sort_key):
"""
'sort_key' parameter only available in 'dict' mode
"""
global last_output_lines
global overflow_flag
global is_atty
if not is_atty:
if isinstance(content, list):
for line in content:
print(line)
elif isinstance(content, dict):
for k, v in sorted(content.items(), key=sort_key):
print("{}: {}".format(k, v))
else:
raise TypeError("Excepting types: list, dict. Got: {}".format(type(content)))
return
columns, rows = get_terminal_size()
lines = lines_of_content(content, columns)
if force_single_line is False and lines > rows:
overflow_flag = True
elif force_single_line is True and len(content) > rows:
overflow_flag = True
# to make sure the cursor is at the left most
print("\b" * columns, end="")
if isinstance(content, list):
for line in content:
_line = preprocess(line)
print_line(_line, columns, force_single_line)
elif isinstance(content, dict):
for k, v in sorted(content.items(), key=sort_key):
_k, _v = map(preprocess, (k, v))
print_line("{}: {}".format(_k, _v), columns, force_single_line)
else:
raise TypeError("Excepting types: list, dict. Got: {}".format(type(content)))
# 输出额外的空行来清除上一次输出的剩余内容
# do extra blank lines to wipe the remaining of last output
print(" " * columns * (last_output_lines - lines), end="")
# 回到初始输出位置
# back to the origin pos
print(magic_char * (max(last_output_lines, lines)-1), end="")
sys.stdout.flush()
last_output_lines = lines
class output:
class SignalList(list):
def __init__(self, parent, obj):
super(output.SignalList, self).__init__(obj)
self.parent = parent
self.lock = threading.Lock()
def __setitem__(self, key, value):
global is_atty
with self.lock:
super(output.SignalList, self).__setitem__(key, value)
if not is_atty:
print("{}".format(value))
else:
self.parent.refresh(int(time.time()*1000), forced=False)
def clear(self):
global is_atty
# with self.lock: In all places you call clear, you actually already have the lock
if six.PY2:
self[:] = []
elif six.PY3:
super(output.SignalList, self).clear()
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
def change(self, newlist):
with self.lock:
self.clear()
self.extend(newlist)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
def append(self, x):
global is_atty
with self.lock:
super(output.SignalList, self).append(x)
if not is_atty:
print("{}".format(x))
else:
self.parent.refresh(int(time.time()*1000), forced=False)
def insert(self, i, x):
global is_atty
with self.lock:
super(output.SignalList, self).insert(i, x)
if not is_atty:
print("{}".format(x))
else:
self.parent.refresh(int(time.time()*1000), forced=False)
def remove(self, x):
global is_atty
with self.lock:
super(output.SignalList, self).remove(x)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
def pop(self, i=-1):
global is_atty
with self.lock:
rs = super(output.SignalList, self).pop(i)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
return rs
def sort(self, *args, **kwargs):
global is_atty
with self.lock:
super(output.SignalList, self).sort(*args, **kwargs)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
class SignalDict(dict):
def __init__(self, parent, obj):
super(output.SignalDict, self).__init__(obj)
self.parent = parent
self.lock = threading.Lock()
def change(self, newlist):
with self.lock:
self.clear()
super(output.SignalDict, self).update(newlist)
self.parent.refresh(int(time.time()*1000), forced=False)
def __setitem__(self, key, value):
global is_atty
with self.lock:
super(output.SignalDict, self).__setitem__(key, value)
if not is_atty:
print("{}: {}".format(key, value))
else:
self.parent.refresh(int(time.time()*1000), forced=False)
def clear(self):
global is_atty
# with self.lock: In all places you call clear, you actually already have the lock
super(output.SignalDict, self).clear()
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
def pop(self, *args, **kwargs):
global is_atty
with self.lock:
rs = super(output.SignalDict, self).pop(*args, **kwargs)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
return rs
def popitem(self, *args, **kwargs):
global is_atty
with self.lock:
rs = super(output.SignalDict, self).popitem(*args, **kwargs)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
return rs
def setdefault(self, *args, **kwargs):
global is_atty
with self.lock:
rs = super(output.SignalDict, self).setdefault(*args, **kwargs)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
return rs
def update(self, *args, **kwargs):
global is_atty
with self.lock:
super(output.SignalDict, self).update(*args, **kwargs)
if is_atty:
self.parent.refresh(int(time.time()*1000), forced=False)
def __init__(self, output_type="list", initial_len=1, interval=0, force_single_line=False, no_warning=False, sort_key=lambda x:x[0]):
self.sort_key = sort_key
self.no_warning = no_warning
no_warning and print("All reprint warning diabled.")
global is_atty
# reprint does not work in the IDLE terminal, and any other environment that can't get terminal_size
if is_atty and not all(get_terminal_size()):
if not no_warning:
r = input("Fail to get terminal size, we got {}, continue anyway? (y/N)".format(get_terminal_size()))
if not (r and isinstance(r, str) and r.lower()[0] in ['y','t','1']):
sys.exit(0)
is_atty = False
if output_type == "list":
self.warped_obj = output.SignalList(self, [''] * initial_len)
elif output_type == "dict":
self.warped_obj = output.SignalDict(self, {})
self.interval = interval
self.force_single_line = force_single_line
self._last_update = int(time.time()*1000)
def refresh(self, new_time=0, forced=True):
if new_time - self._last_update >= self.interval or forced:
print_multi_line(self.warped_obj, self.force_single_line, sort_key=self.sort_key)
self._last_update = new_time
def __enter__(self):
global is_atty
if not is_atty:
if not self.no_warning:
print("Not in terminal, reprint now using normal build-in print function.")
return self.warped_obj
def __exit__(self, exc_type, exc_val, exc_tb):
global is_atty
self.refresh(forced=True)
if is_atty:
columns, _ = get_terminal_size()
if self.force_single_line:
print('\n' * len(self.warped_obj), end="")
else:
print('\n' * lines_of_content(self.warped_obj, columns), end="")
global last_output_lines
global overflow_flag
last_output_lines = 0
if overflow_flag:
if not self.no_warning:
print("Detected that the lines of output has been exceeded the height of terminal windows, which \
caused the former output remained and keep adding new lines.")