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from __future__ import unicode_literals

import os

import subprocess

import sys

from pre_commit import color

from pre_commit import five

# TODO: smell: import side-effects

try:

if not os.environ.get('TERM'): # pragma: no cover (dumb terminal)

raise OSError('Cannot determine width without TERM')

COLS = int(

subprocess.Popen(

('tput', 'cols'), stdout=subprocess.PIPE,

).communicate()[0] or

# Default in the case of no terminal

)

except OSError: # pragma: no cover (windows)

COLS = 80

def get_hook_message(

start,

postfix='',

end_msg=None,

end_len=0,

end_color=None,

use_color=None,

cols=COLS,

"""Prints a message for running a hook.

This currently supports three approaches:

# Print `start` followed by dots, leaving 6 characters at the end

>>> print_hook_message('start', end_len=6)

start...............................................................

# Print `start` followed by dots with the end message colored if coloring

# is specified and a newline afterwards

>>> print_hook_message(

'start',

end_msg='end',

end_color=color.RED,

use_color=True,

)

start...................................................................end

# Print `start` followed by dots, followed by the `postfix` message

# uncolored, followed by the `end_msg` colored if specified and a newline

# afterwards

>>> print_hook_message(

'start',

postfix='postfix ',

end_msg='end',

end_color=color.RED,

use_color=True,

)

start...........................................................postfix end

"""

if bool(end_msg) == bool(end_len):

raise ValueError('Expected one of (`end_msg`, `end_len`)')

if end_msg is not None and (end_color is None or use_color is None):

raise ValueError(

'`end_color` and `use_color` are required with `end_msg`'

)

if end_len:

return start + '.' * (cols - len(start) - end_len - 1)

else:

return '{0}{1}{2}{3}\n'.format(

start,

'.' * (cols - len(start) - len(postfix) - len(end_msg) - 1),

postfix,

color.format_color(end_msg, end_color, use_color),

)

stdout_byte_stream = getattr(sys.stdout, 'buffer', sys.stdout)

def sys_stdout_write_wrapper(s, stream=stdout_byte_stream):

stream.write(five.to_bytes(s))

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