xref: /openbmc/u-boot/tools/patman/tout.py (revision fa61ef6b) 
1# Copyright (c) 2016 Google, Inc
2#
3# SPDX-License-Identifier:            GPL-2.0+
4#
5# Terminal output logging.
6#
7
8import sys
9
10import terminal
11
12# Output verbosity levels that we support
13ERROR = 0
14WARNING = 1
15NOTICE = 2
16INFO = 3
17DEBUG = 4
18
19"""
20This class handles output of progress and other useful information
21to the user. It provides for simple verbosity level control and can
22output nothing but errors at verbosity zero.
23
24The idea is that modules set up an Output object early in their years and pass
25it around to other modules that need it. This keeps the output under control
26of a single class.
27
28Public properties:
29    verbose: Verbosity level: 0=silent, 1=progress, 3=full, 4=debug
30"""
31def __enter__():
32    return
33
34def __exit__(unused1, unused2, unused3):
35    """Clean up and remove any progress message."""
36    ClearProgress()
37    return False
38
39def UserIsPresent():
40    """This returns True if it is likely that a user is present.
41
42    Sometimes we want to prompt the user, but if no one is there then this
43    is a waste of time, and may lock a script which should otherwise fail.
44
45    Returns:
46        True if it thinks the user is there, and False otherwise
47    """
48    return stdout_is_tty and verbose > 0
49
50def ClearProgress():
51    """Clear any active progress message on the terminal."""
52    if verbose > 0 and stdout_is_tty:
53        _stdout.write('\r%s\r' % (" " * len (_progress)))
54        _stdout.flush()
55
56def Progress(msg, warning=False, trailer='...'):
57    """Display progress information.
58
59    Args:
60        msg: Message to display.
61        warning: True if this is a warning."""
62    ClearProgress()
63    if verbose > 0:
64        _progress = msg + trailer
65        if stdout_is_tty:
66            col = _color.YELLOW if warning else _color.GREEN
67            _stdout.write('\r' + _color.Color(col, _progress))
68            _stdout.flush()
69        else:
70            _stdout.write(_progress + '\n')
71
72def _Output(level, msg, color=None):
73    """Output a message to the terminal.
74
75    Args:
76        level: Verbosity level for this message. It will only be displayed if
77                this as high as the currently selected level.
78        msg; Message to display.
79        error: True if this is an error message, else False.
80    """
81    if verbose >= level:
82        ClearProgress()
83        if color:
84            msg = _color.Color(color, msg)
85        _stdout.write(msg + '\n')
86
87def DoOutput(level, msg):
88    """Output a message to the terminal.
89
90    Args:
91        level: Verbosity level for this message. It will only be displayed if
92                this as high as the currently selected level.
93        msg; Message to display.
94    """
95    _Output(level, msg)
96
97def Error(msg):
98    """Display an error message
99
100    Args:
101        msg; Message to display.
102    """
103    _Output(0, msg, _color.RED)
104
105def Warning(msg):
106    """Display a warning message
107
108    Args:
109        msg; Message to display.
110    """
111    _Output(1, msg, _color.YELLOW)
112
113def Notice(msg):
114    """Display an important infomation message
115
116    Args:
117        msg; Message to display.
118    """
119    _Output(2, msg)
120
121def Info(msg):
122    """Display an infomation message
123
124    Args:
125        msg; Message to display.
126    """
127    _Output(3, msg)
128
129def Debug(msg):
130    """Display a debug message
131
132    Args:
133        msg; Message to display.
134    """
135    _Output(4, msg)
136
137def UserOutput(msg):
138    """Display a message regardless of the current output level.
139
140    This is used when the output was specifically requested by the user.
141    Args:
142        msg; Message to display.
143    """
144    _Output(0, msg)
145
146def Init(_verbose=WARNING, stdout=sys.stdout):
147    """Initialize a new output object.
148
149    Args:
150        verbose: Verbosity level (0-4).
151        stdout: File to use for stdout.
152    """
153    global verbose, _progress, _color, _stdout, stdout_is_tty
154
155    verbose = _verbose
156    _progress = ''                    # Our last progress message
157    _color = terminal.Color()
158    _stdout = stdout
159
160    # TODO(sjg): Move this into Chromite libraries when we have them
161    stdout_is_tty = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()
162
163def Uninit():
164    ClearProgress()
165
166Init()
167