A thin, practical wrapper around terminal styling, screen positioning, and keyboard input.
Project description
Introduction
Blessed is a thin, practical wrapper around terminal capabilities in Python.
Coding with Blessed looks like this…
from blessed import Terminal
t = Terminal()
print(t.bold('Hi there!'))
print(t.bold_red_on_bright_green('It hurts my eyes!'))
with t.location(0, t.height - 1):
print(t.center(t.blink('press any key to continue.')))
with t.cbreak():
inp = t.inkey()
print('You pressed ' + repr(inp))
Brief Overview
Blessed is a more simplified wrapper around curses, providing :
Styles, color, and maybe a little positioning without necessarily clearing the whole screen first.
Works great with standard Python string formatting.
Provides up-to-the-moment terminal height and width, so you can respond to terminal size changes.
Avoids making a mess if the output gets piped to a non-terminal: outputs to any file-like object such as StringIO, files, or pipes.
Uses the terminfo(5) database so it works with any terminal type and supports any terminal capability: No more C-like calls to tigetstr and tparm.
Keeps a minimum of internal state, so you can feel free to mix and match with calls to curses or whatever other terminal libraries you like.
Provides plenty of context managers to safely express terminal modes, automatically restoring the terminal to a safe state on exit.
Act intelligently when somebody redirects your output to a file, omitting all of the terminal sequences such as styling, colors, or positioning.
Dead-simple keyboard handling: safely decoding unicode input in your system’s preferred locale and supports application/arrow keys.
Allows the printable length of strings containing sequences to be determined.
Blessed does not provide…
Windows command prompt support. A PDCurses build of python for windows provides only partial support at this time – there are plans to merge with the ansi module in concert with colorama to resolve this. Patches welcome!
Before And After
With the built-in curses module, this is how you would typically print some underlined text at the bottom of the screen:
from curses import tigetstr, setupterm, tparm
from fcntl import ioctl
from os import isatty
import struct
import sys
from termios import TIOCGWINSZ
# If we want to tolerate having our output piped to other commands or
# files without crashing, we need to do all this branching:
if hasattr(sys.stdout, 'fileno') and isatty(sys.stdout.fileno()):
setupterm()
sc = tigetstr('sc')
cup = tigetstr('cup')
rc = tigetstr('rc')
underline = tigetstr('smul')
normal = tigetstr('sgr0')
else:
sc = cup = rc = underline = normal = ''
# Save cursor position.
print(sc)
if cup:
# tigetnum('lines') doesn't always update promptly, hence this:
height = struct.unpack('hhhh', ioctl(0, TIOCGWINSZ, '\000' * 8))[0]
# Move cursor to bottom.
print(tparm(cup, height - 1, 0))
print('This is {under}underlined{normal}!'
.format(under=underline, normal=normal))
# Restore cursor position.
print(rc)
The same program with Blessed is simply:
from blessed import Terminal
term = Terminal()
with term.location(0, term.height - 1):
print('This is' + term.underline('underlined') + '!')
Requirements
Blessed is tested with Python 2.7, 3.4, and 3.5 on Debian Linux, Mac, and FreeBSD.
Further Documentation
More documentation can be found at http://blessed.readthedocs.org/en/latest/
Bugs, Contributing, Support
Bugs or suggestions? Visit the issue tracker and file an issue. We welcome your bug reports and feature suggestions!
Would you like to contribute? That’s awesome! We’ve written a guide to help you.
Are you stuck and need support? Give stackoverflow a try. If you’re still having trouble, we’d like to hear about it! Open an issue in the issue tracker with a well-formed question.
License
Blessed is under the MIT License. See the LICENSE file.
Forked
Blessed is a fork of blessings. Changes since 1.7 have all been proposed but unaccepted upstream.
Furthermore, a project in the node.js language of the same name is not related, or a fork of each other in any way.
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