author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
""" |
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2 |
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3 |
Helper functions for writing to terminals and files. |
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4 |
|
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5 |
""" |
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6 |
|
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8 |
import sys, os |
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9 |
import py |
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10 |
|
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11 |
win32_and_ctypes = False |
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12 |
if sys.platform == "win32": |
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13 |
try: |
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14 |
import ctypes |
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win32_and_ctypes = True |
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16 |
except ImportError: |
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17 |
pass |
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18 |
|
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def _getdimensions(): |
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20 |
import termios,fcntl,struct |
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21 |
call = fcntl.ioctl(1,termios.TIOCGWINSZ,"\000"*8) |
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22 |
height,width = struct.unpack( "hhhh", call ) [:2] |
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23 |
return height, width |
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|
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|
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def get_terminal_width(): |
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try: |
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height, width = _getdimensions() |
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29 |
except py.builtin._sysex: |
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raise |
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except: |
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32 |
# FALLBACK |
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width = int(os.environ.get('COLUMNS', 80)) |
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34 |
else: |
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# XXX the windows getdimensions may be bogus, let's sanify a bit |
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36 |
if width < 40: |
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width = 80 |
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return width |
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39 |
|
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40 |
terminal_width = get_terminal_width() |
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41 |
|
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42 |
# XXX unify with _escaped func below |
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43 |
def ansi_print(text, esc, file=None, newline=True, flush=False): |
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if file is None: |
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45 |
file = sys.stderr |
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46 |
text = text.rstrip() |
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47 |
if esc and not isinstance(esc, tuple): |
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esc = (esc,) |
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49 |
if esc and sys.platform != "win32" and file.isatty(): |
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50 |
text = (''.join(['\x1b[%sm' % cod for cod in esc]) + |
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51 |
text + |
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52 |
'\x1b[0m') # ANSI color code "reset" |
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53 |
if newline: |
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text += '\n' |
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55 |
|
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if esc and win32_and_ctypes and file.isatty(): |
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57 |
if 1 in esc: |
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bold = True |
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esc = tuple([x for x in esc if x != 1]) |
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60 |
else: |
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bold = False |
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62 |
esctable = {() : FOREGROUND_WHITE, # normal |
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63 |
(31,): FOREGROUND_RED, # red |
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64 |
(32,): FOREGROUND_GREEN, # green |
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65 |
(33,): FOREGROUND_GREEN|FOREGROUND_RED, # yellow |
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66 |
(34,): FOREGROUND_BLUE, # blue |
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67 |
(35,): FOREGROUND_BLUE|FOREGROUND_RED, # purple |
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68 |
(36,): FOREGROUND_BLUE|FOREGROUND_GREEN, # cyan |
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69 |
(37,): FOREGROUND_WHITE, # white |
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70 |
(39,): FOREGROUND_WHITE, # reset |
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71 |
} |
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72 |
attr = esctable.get(esc, FOREGROUND_WHITE) |
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73 |
if bold: |
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attr |= FOREGROUND_INTENSITY |
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75 |
STD_OUTPUT_HANDLE = -11 |
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76 |
STD_ERROR_HANDLE = -12 |
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77 |
if file is sys.stderr: |
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78 |
handle = GetStdHandle(STD_ERROR_HANDLE) |
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79 |
else: |
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80 |
handle = GetStdHandle(STD_OUTPUT_HANDLE) |
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81 |
oldcolors = GetConsoleInfo(handle).wAttributes |
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82 |
attr |= (oldcolors & 0x0f0) |
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83 |
SetConsoleTextAttribute(handle, attr) |
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84 |
file.write(text) |
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85 |
SetConsoleTextAttribute(handle, oldcolors) |
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86 |
else: |
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87 |
file.write(text) |
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88 |
|
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89 |
if flush: |
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90 |
file.flush() |
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91 |
|
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92 |
def should_do_markup(file): |
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93 |
return hasattr(file, 'isatty') and file.isatty() \ |
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94 |
and os.environ.get('TERM') != 'dumb' \ |
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95 |
and not (sys.platform.startswith('java') and os._name == 'nt') |
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96 |
|
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97 |
class TerminalWriter(object): |
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98 |
_esctable = dict(black=30, red=31, green=32, yellow=33, |
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99 |
blue=34, purple=35, cyan=36, white=37, |
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100 |
Black=40, Red=41, Green=42, Yellow=43, |
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101 |
Blue=44, Purple=45, Cyan=46, White=47, |
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102 |
bold=1, light=2, blink=5, invert=7) |
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103 |
|
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104 |
# XXX deprecate stringio argument |
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105 |
def __init__(self, file=None, stringio=False, encoding=None): |
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106 |
if file is None: |
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107 |
if stringio: |
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108 |
self.stringio = file = py.io.TextIO() |
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109 |
else: |
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110 |
file = py.std.sys.stdout |
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111 |
if hasattr(file, 'encoding'): |
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112 |
encoding = file.encoding |
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113 |
elif hasattr(file, '__call__'): |
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114 |
file = WriteFile(file, encoding=encoding) |
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115 |
self.encoding = encoding |
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116 |
self._file = file |
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117 |
self.fullwidth = get_terminal_width() |
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|
118 |
self.hasmarkup = should_do_markup(file) |
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|
119 |
|
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|
120 |
def _escaped(self, text, esc): |
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|
121 |
if esc and self.hasmarkup: |
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122 |
text = (''.join(['\x1b[%sm' % cod for cod in esc]) + |
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|
123 |
text +'\x1b[0m') |
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124 |
return text |
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|
125 |
|
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126 |
def markup(self, text, **kw): |
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|
127 |
esc = [] |
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|
128 |
for name in kw: |
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129 |
if name not in self._esctable: |
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130 |
raise ValueError("unknown markup: %r" %(name,)) |
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|
131 |
if kw[name]: |
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|
132 |
esc.append(self._esctable[name]) |
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|
133 |
return self._escaped(text, tuple(esc)) |
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134 |
|
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|
135 |
def sep(self, sepchar, title=None, fullwidth=None, **kw): |
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|
136 |
if fullwidth is None: |
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137 |
fullwidth = self.fullwidth |
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138 |
# the goal is to have the line be as long as possible |
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|
139 |
# under the condition that len(line) <= fullwidth |
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140 |
if title is not None: |
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|
141 |
# we want 2 + 2*len(fill) + len(title) <= fullwidth |
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142 |
# i.e. 2 + 2*len(sepchar)*N + len(title) <= fullwidth |
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|
143 |
# 2*len(sepchar)*N <= fullwidth - len(title) - 2 |
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144 |
# N <= (fullwidth - len(title) - 2) // (2*len(sepchar)) |
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|
145 |
N = (fullwidth - len(title) - 2) // (2*len(sepchar)) |
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|
146 |
fill = sepchar * N |
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|
147 |
line = "%s %s %s" % (fill, title, fill) |
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|
148 |
else: |
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|
149 |
# we want len(sepchar)*N <= fullwidth |
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|
150 |
# i.e. N <= fullwidth // len(sepchar) |
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|
151 |
line = sepchar * (fullwidth // len(sepchar)) |
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|
152 |
# in some situations there is room for an extra sepchar at the right, |
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|
153 |
# in particular if we consider that with a sepchar like "_ " the |
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|
154 |
# trailing space is not important at the end of the line |
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|
155 |
if len(line) + len(sepchar.rstrip()) <= fullwidth: |
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|
156 |
line += sepchar.rstrip() |
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|
157 |
|
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|
158 |
self.line(line, **kw) |
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changeset
|
159 |
|
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|
160 |
def write(self, s, **kw): |
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|
161 |
if s: |
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|
162 |
if not isinstance(self._file, WriteFile): |
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|
163 |
s = self._getbytestring(s) |
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|
164 |
if self.hasmarkup and kw: |
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|
165 |
s = self.markup(s, **kw) |
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|
166 |
self._file.write(s) |
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|
167 |
self._file.flush() |
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|
168 |
|
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|
169 |
def _getbytestring(self, s): |
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|
170 |
# XXX review this and the whole logic |
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|
171 |
if self.encoding and sys.version_info[0] < 3 and isinstance(s, unicode): |
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|
172 |
return s.encode(self.encoding) |
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|
173 |
elif not isinstance(s, str): |
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|
174 |
try: |
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|
175 |
return str(s) |
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|
176 |
except UnicodeEncodeError: |
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|
177 |
return "<print-error '%s' object>" % type(s).__name__ |
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|
178 |
return s |
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|
179 |
|
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|
180 |
def line(self, s='', **kw): |
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|
181 |
self.write(s, **kw) |
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|
182 |
self.write('\n') |
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|
183 |
|
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|
184 |
class Win32ConsoleWriter(TerminalWriter): |
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|
185 |
def write(self, s, **kw): |
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|
186 |
if s: |
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|
187 |
oldcolors = None |
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|
188 |
if self.hasmarkup and kw: |
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|
189 |
handle = GetStdHandle(STD_OUTPUT_HANDLE) |
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changeset
|
190 |
oldcolors = GetConsoleInfo(handle).wAttributes |
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changeset
|
191 |
default_bg = oldcolors & 0x00F0 |
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|
192 |
attr = default_bg |
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|
193 |
if kw.pop('bold', False): |
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|
194 |
attr |= FOREGROUND_INTENSITY |
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|
195 |
|
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|
196 |
if kw.pop('red', False): |
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|
197 |
attr |= FOREGROUND_RED |
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|
198 |
elif kw.pop('blue', False): |
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|
199 |
attr |= FOREGROUND_BLUE |
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|
200 |
elif kw.pop('green', False): |
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changeset
|
201 |
attr |= FOREGROUND_GREEN |
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changeset
|
202 |
else: |
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changeset
|
203 |
attr |= FOREGROUND_BLACK # (oldcolors & 0x0007) |
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|
204 |
|
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|
205 |
SetConsoleTextAttribute(handle, attr) |
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|
206 |
if not isinstance(self._file, WriteFile): |
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changeset
|
207 |
s = self._getbytestring(s) |
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|
208 |
self._file.write(s) |
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|
209 |
self._file.flush() |
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changeset
|
210 |
if oldcolors: |
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changeset
|
211 |
SetConsoleTextAttribute(handle, oldcolors) |
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changeset
|
212 |
|
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|
213 |
def line(self, s="", **kw): |
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|
214 |
self.write(s+"\n", **kw) |
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|
215 |
|
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|
216 |
class WriteFile(object): |
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|
217 |
def __init__(self, writemethod, encoding=None): |
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|
218 |
self.encoding = encoding |
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|
219 |
self._writemethod = writemethod |
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|
220 |
|
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|
221 |
def write(self, data): |
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|
222 |
if self.encoding: |
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|
223 |
data = data.encode(self.encoding) |
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|
224 |
self._writemethod(data) |
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|
225 |
|
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|
226 |
def flush(self): |
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|
227 |
return |
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|
228 |
|
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|
229 |
|
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changeset
|
230 |
if win32_and_ctypes: |
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|
231 |
TerminalWriter = Win32ConsoleWriter |
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|
232 |
import ctypes |
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|
233 |
from ctypes import wintypes |
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|
234 |
|
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|
235 |
# ctypes access to the Windows console |
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STD_OUTPUT_HANDLE = -11 |
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STD_ERROR_HANDLE = -12 |
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FOREGROUND_BLACK = 0x0000 # black text |
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FOREGROUND_BLUE = 0x0001 # text color contains blue. |
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FOREGROUND_GREEN = 0x0002 # text color contains green. |
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FOREGROUND_RED = 0x0004 # text color contains red. |
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FOREGROUND_WHITE = 0x0007 |
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FOREGROUND_INTENSITY = 0x0008 # text color is intensified. |
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BACKGROUND_BLACK = 0x0000 # background color black |
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BACKGROUND_BLUE = 0x0010 # background color contains blue. |
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BACKGROUND_GREEN = 0x0020 # background color contains green. |
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BACKGROUND_RED = 0x0040 # background color contains red. |
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BACKGROUND_WHITE = 0x0070 |
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BACKGROUND_INTENSITY = 0x0080 # background color is intensified. |
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SHORT = ctypes.c_short |
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class COORD(ctypes.Structure): |
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_fields_ = [('X', SHORT), |
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('Y', SHORT)] |
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class SMALL_RECT(ctypes.Structure): |
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_fields_ = [('Left', SHORT), |
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('Top', SHORT), |
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('Right', SHORT), |
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('Bottom', SHORT)] |
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class CONSOLE_SCREEN_BUFFER_INFO(ctypes.Structure): |
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_fields_ = [('dwSize', COORD), |
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('dwCursorPosition', COORD), |
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('wAttributes', wintypes.WORD), |
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('srWindow', SMALL_RECT), |
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('dwMaximumWindowSize', COORD)] |
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def GetStdHandle(kind): |
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return ctypes.windll.kernel32.GetStdHandle(kind) |
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SetConsoleTextAttribute = \ |
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ctypes.windll.kernel32.SetConsoleTextAttribute |
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def GetConsoleInfo(handle): |
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info = CONSOLE_SCREEN_BUFFER_INFO() |
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ctypes.windll.kernel32.GetConsoleScreenBufferInfo(\ |
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handle, ctypes.byref(info)) |
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return info |
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def _getdimensions(): |
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handle = GetStdHandle(STD_OUTPUT_HANDLE) |
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info = GetConsoleInfo(handle) |
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# Substract one from the width, otherwise the cursor wraps |
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# and the ending \n causes an empty line to display. |
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return info.dwSize.Y, info.dwSize.X - 1 |
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