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Metadata-Version: 2.1
Name: wcwidth
Version: 0.2.4
Summary: Measures the displayed width of unicode strings in a terminal
Home-page: https://github.com/jquast/wcwidth
Author: Jeff Quast
Author-email: contact@jeffquast.com
License: MIT
Keywords: cjk,combining,console,eastasian,emojiemulator,terminal,unicode,wcswidth,wcwidth,xterm
Platform: UNKNOWN
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: POSIX
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Software Development :: Localization
Classifier: Topic :: Software Development :: Internationalization
Classifier: Topic :: Terminals
Requires-Dist: backports.functools-lru-cache (>=1.2.1) ; python_version < "3.2"
|pypi_downloads| |codecov| |license|
============
Introduction
============
This library is mainly for CLI programs that carefully produce output for
Terminals, or make pretend to be an emulator.
**Problem Statement**: The printable length of *most* strings are equal to the
number of cells they occupy on the screen ``1 charater : 1 cell``. However,
there are categories of characters that *occupy 2 cells* (full-wide), and
others that *occupy 0* cells (zero-width).
**Solution**: POSIX.1-2001 and POSIX.1-2008 conforming systems provide
`wcwidth(3)`_ and `wcswidth(3)`_ C functions of which this python module's
functions precisely copy. *These functions return the number of cells a
unicode string is expected to occupy.*
Installation
------------
The stable version of this package is maintained on pypi, install using pip::
pip install wcwidth
Example
-------
**Problem**: given the following phrase (Japanese),
>>> text = u'コンニチハ'
Python **incorrectly** uses the *string length* of 5 codepoints rather than the
*printible length* of 10 cells, so that when using the `rjust` function, the
output length is wrong::
>>> print(len('コンニチハ'))
5
>>> print('コンニチハ'.rjust(20, '_'))
_____コンニチハ
By defining our own "rjust" function that uses wcwidth, we can correct this::
>>> def wc_rjust(text, length, padding=' '):
... from wcwidth import wcswidth
... return padding * max(0, (length - wcswidth(text))) + text
...
Our **Solution** uses wcswidth to determine the string length correctly::
>>> from wcwidth import wcswidth
>>> print(wcswidth('コンニチハ'))
10
>>> print(wc_rjust('コンニチハ', 20, '_'))
__________コンニチハ
Choosing a Version
------------------
Export an environment variable, ``UNICODE_VERSION``. This should be done by
*terminal emulators* or those developers experimenting with authoring one of
their own, from shell::
$ export UNICODE_VERSION=13.0
If unspecified, the latest version is used. If your Terminal Emulator does not
export this variable, you can use the `jquast/ucs-detect`_ utility to
automatically detect and export it to your shell.
wcwidth, wcswidth
-----------------
Use function ``wcwidth()`` to determine the length of a *single unicode
character*, and ``wcswidth()`` to determine the length of many, a *string
of unicode characters*.
Briefly, return values of function ``wcwidth()`` are:
``-1``
Indeterminate (not printable).
``0``
Does not advance the cursor, such as NULL or Combining.
``2``
Characters of category East Asian Wide (W) or East Asian
Full-width (F) which are displayed using two terminal cells.
``1``
All others.
Function ``wcswidth()`` simply returns the sum of all values for each character
along a string, or ``-1`` when it occurs anywhere along a string.
Full API Documentation at http://wcwidth.readthedocs.org
==========
Developing
==========
Install wcwidth in editable mode::
pip install -e.
Execute unit tests using tox_::
tox
Regenerate python code tables from latest Unicode Specification data files::
tox -eupdate
Supplementary tools for browsing and testing terminals for wide unicode
characters are found in the `bin/`_ of this project's source code. Just ensure
to first ``pip install -erequirements-develop.txt`` from this projects main
folder. For example, an interactive browser for testing::
./bin/wcwidth-browser.py
Uses
----
This library is used in:
- `jquast/blessed`_: a thin, practical wrapper around terminal capabilities in
Python.
- `jonathanslenders/python-prompt-toolkit`_: a Library for building powerful
interactive command lines in Python.
- `dbcli/pgcli`_: Postgres CLI with autocompletion and syntax highlighting.
- `thomasballinger/curtsies`_: a Curses-like terminal wrapper with a display
based on compositing 2d arrays of text.
- `selectel/pyte`_: Simple VTXXX-compatible linux terminal emulator.
- `astanin/python-tabulate`_: Pretty-print tabular data in Python, a library
and a command-line utility.
- `LuminosoInsight/python-ftfy`_: Fixes mojibake and other glitches in Unicode
text.
- `nbedos/termtosvg`_: Terminal recorder that renders sessions as SVG
animations.
- `peterbrittain/asciimatics`_: Package to help people create full-screen text
UIs.
Other Languages
---------------
- `timoxley/wcwidth`_: JavaScript
- `janlelis/unicode-display_width`_: Ruby
- `alecrabbit/php-wcwidth`_: PHP
- `Text::CharWidth`_: Perl
- `mattn/go-runewidth`_: Go
- `emugel/wcwidth`_: Haxe
History
-------
0.2.0 *2020-06-01*
* **Enhancement**: Unicode version may be selected by exporting the
Environment variable ``UNICODE_VERSION``, such as ``13.0``, or ``6.3.0``.
See the `jquast/ucs-detect`_ CLI utility for automatic detection.
* **Enhancement**:
API Documentation is published to readthedocs.org.
* **Updated** tables for *all* Unicode Specifications with files
published in a programmatically consumable format, versions 4.1.0
through 13.0
that are published
, versions
0.1.9 *2020-03-22*
* **Performance** optimization by `Avram Lubkin`_, `PR #35`_.
* **Updated** tables to Unicode Specification 13.0.0.
0.1.8 *2020-01-01*
* **Updated** tables to Unicode Specification 12.0.0. (`PR #30`_).
0.1.7 *2016-07-01*
* **Updated** tables to Unicode Specification 9.0.0. (`PR #18`_).
0.1.6 *2016-01-08 Production/Stable*
* ``LICENSE`` file now included with distribution.
0.1.5 *2015-09-13 Alpha*
* **Bugfix**:
Resolution of "combining_ character width" issue, most especially
those that previously returned -1 now often (correctly) return 0.
resolved by `Philip Craig`_ via `PR #11`_.
* **Deprecated**:
The module path ``wcwidth.table_comb`` is no longer available,
it has been superseded by module path ``wcwidth.table_zero``.
0.1.4 *2014-11-20 Pre-Alpha*
* **Feature**: ``wcswidth()`` now determines printable length
for (most) combining_ characters. The developer's tool
`bin/wcwidth-browser.py`_ is improved to display combining_
characters when provided the ``--combining`` option
(`Thomas Ballinger`_ and `Leta Montopoli`_ `PR #5`_).
* **Feature**: added static analysis (prospector_) to testing
framework.
0.1.3 *2014-10-29 Pre-Alpha*
* **Bugfix**: 2nd parameter of wcswidth was not honored.
(`Thomas Ballinger`_, `PR #4`_).
0.1.2 *2014-10-28 Pre-Alpha*
* **Updated** tables to Unicode Specification 7.0.0.
(`Thomas Ballinger`_, `PR #3`_).
0.1.1 *2014-05-14 Pre-Alpha*
* Initial release to pypi, Based on Unicode Specification 6.3.0
This code was originally derived directly from C code of the same name,
whose latest version is available at
http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c::
* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
*
* Permission to use, copy, modify, and distribute this software
* for any purpose and without fee is hereby granted. The author
* disclaims all warranties with regard to this software.
.. _`tox`: https://testrun.org/tox/latest/install.html
.. _`prospector`: https://github.com/landscapeio/prospector
.. _`combining`: https://en.wikipedia.org/wiki/Combining_character
.. _`bin/`: https://github.com/jquast/wcwidth/tree/master/bin
.. _`bin/wcwidth-browser.py`: https://github.com/jquast/wcwidth/tree/master/bin/wcwidth-browser.py
.. _`Thomas Ballinger`: https://github.com/thomasballinger
.. _`Leta Montopoli`: https://github.com/lmontopo
.. _`Philip Craig`: https://github.com/philipc
.. _`PR #3`: https://github.com/jquast/wcwidth/pull/3
.. _`PR #4`: https://github.com/jquast/wcwidth/pull/4
.. _`PR #5`: https://github.com/jquast/wcwidth/pull/5
.. _`PR #11`: https://github.com/jquast/wcwidth/pull/11
.. _`PR #18`: https://github.com/jquast/wcwidth/pull/18
.. _`PR #30`: https://github.com/jquast/wcwidth/pull/30
.. _`PR #35`: https://github.com/jquast/wcwidth/pull/35
.. _`jquast/blessed`: https://github.com/jquast/blessed
.. _`selectel/pyte`: https://github.com/selectel/pyte
.. _`thomasballinger/curtsies`: https://github.com/thomasballinger/curtsies
.. _`dbcli/pgcli`: https://github.com/dbcli/pgcli
.. _`jonathanslenders/python-prompt-toolkit`: https://github.com/jonathanslenders/python-prompt-toolkit
.. _`timoxley/wcwidth`: https://github.com/timoxley/wcwidth
.. _`wcwidth(3)`: http://man7.org/linux/man-pages/man3/wcwidth.3.html
.. _`wcswidth(3)`: http://man7.org/linux/man-pages/man3/wcswidth.3.html
.. _`astanin/python-tabulate`: https://github.com/astanin/python-tabulate
.. _`janlelis/unicode-display_width`: https://github.com/janlelis/unicode-display_width
.. _`LuminosoInsight/python-ftfy`: https://github.com/LuminosoInsight/python-ftfy
.. _`alecrabbit/php-wcwidth`: https://github.com/alecrabbit/php-wcwidth
.. _`Text::CharWidth`: https://metacpan.org/pod/Text::CharWidth
.. _`mattn/go-runewidth`: https://github.com/mattn/go-runewidth
.. _`emugel/wcwidth`: https://github.com/emugel/wcwidth
.. _`jquast/ucs-detect`: https://github.com/jquast/ucs-detect
.. _`Avram Lubkin`: https://github.com/avylove
.. _`nbedos/termtosvg`: https://github.com/nbedos/termtosvg
.. _`peterbrittain/asciimatics`: https://github.com/peterbrittain/asciimatics
.. |pypi_downloads| image:: https://img.shields.io/pypi/dm/wcwidth.svg?logo=pypi
:alt: Downloads
:target: https://pypi.org/project/wcwidth/
.. |codecov| image:: https://codecov.io/gh/jquast/wcwidth/branch/master/graph/badge.svg
:alt: codecov.io Code Coverage
:target: https://codecov.io/gh/jquast/wcwidth/
.. |license| image:: https://img.shields.io/github/license/jquast/wcwidth.svg
:target: https://pypi.python.org/pypi/wcwidth/
:alt: MIT License
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