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=============
UCS-4 support
=============
The nvPY may not display non-BMP characters such as emoji, some symbols, characters for minor languages, and so on.
The cause is that python and libraries are built without UCS-4 support.
This document provides instructions for resolving this issue.
For Windows
===========
Currently, Python official binary is built without UCS-4 support because it have `some issues <https://bugs.python.org/issue13153>`_.
Therefore, nvPY v2.x.x can not handle non-BMP characters.
The nvPY v1.2.x will be able to handle non-BMP characters. It's not a recommended way, but it works well.
For Linux
=========
Try to rebuild the python3, tk, and tcl with :code:`CFLAGS=-DTCL_UTF_MAX=6` and :code:`--enable-unicode=ucs4` option.
Note that current version tcl/tk is not fully support unicode. This solution is not perfect, but displayable characters will be increase.
1. Download source codes of `python3 <https://www.python.org/downloads/source/>`_, `tk, and tcl <https://www.tcl.tk/software/tcltk/download.html>`_.
2. Build and install as following. ::
# build.sh
export CFLAGS=-DTCL_UTF_MAX=6
export PREFIX=/opt/nvpy
export LD_LIBRARY_PATH=$PREFIX/lib
tar xf tcl8.6.10-src.tar.gz
tar xf tk8.6.10-src.tar.gz
tar xf Python-3.8.6.tar.xz
sudo apt build-dep -y tcl tk python3.8
cd tcl8.6.10/unix
./configure --enable-threads --enable-shared --enable-symbols --enable-64bit --enable-langinfo --enable-man-symlinks
make
sudo make install
cd ../..
cd tk8.6.10/unix
./configure --enable-threads --enable-shared --enable-symbols --enable-64bit --enable-man-symlinks
make
sudo make install
cd ../..
cd Python-3.8.6
./configure --enable-shared --enable-optimizations --enable-ipv6 --enable-unicode=ucs4 --with-lto --with-signal-module --with-pth --with-wctype-functions --with-tcltk-includes=/usr/local/include/ --with-tcltk-libs=/usr/local/lib/
make
sudo make install
3. Copy-and-paste some emoji to nvPY. If it can be displayed normally, it is successful.
You can easily copy emoji from `getemoji.com <https://getemoji.com>`_.
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