chumma-ttf is a ttf file that runs WebAssembly to replace specific words as we type using harfbuzz text shaping engine.
More details about the wasm shaper here
- Configuration of chumma-ttf requires harfbuzz library built with WebAssembly Support and wasm-macro-runtime library.
meson, pkg-config, ragel, gcc, freetype2, glib2, glib2-devel, cairo
Install these packages from your distro package manager
git clone https://github.com/bytecodealliance/wasm-micro-runtime/ && cd wasm-macro-runtime
cmake -B build -DWAMR_BUILD_REF_TYPES=1 -DWAMR_BUILD_FAST_JIT=1
cmake --build build --parallel
Note: if you want to install wasm-macro-runtime as a global shared object run this command too.
sudo cmake --build build --target install
install it globally or use it from the directory build/ with the name libiwasm.so
git clone https://github.com/harfbuzz/harfbuzz
cd harfbuzz
meson setup build -Dwasm=enabled
Make sure the output of the last command contains
…
Additional shapers
Graphite2 : NO
WebAssembly (experimental): YES
…
Now for building run:
meson compile -C build
You will have the library built as shared objects in build/src directory, since these shared objects would probably be installed in our system by default(a lot of softwares use harfbuzz as text shaping engine)
the only shared object we are going to need is libharfbuzz.so.0.6XXXX.0
git clone https://github.com/7h3cyb3rm0nk/chumma-ttf
cd chumma-ttf/chumma_ttf
You can edit src/words.conf to replace certain words when typed with chumma-ttf
Example words.conf file
#This is a comment
#Format is 'word:word-to-be-replace'
#Example:
Hello:Hi
pics:pigs
sweet:shit
Now to generate the ttf file run this command:
python -m venv .env
source .env/bin/activate
make
the font file will be generated as chumma.ttf
run this command to use it
cp chumma.ttf ~/.local/share/fonts/
fc-cache
In order to run Wasm inside the ttf you have to preload the shared objects using LD_PRELOAD environment variable run
export LD_PRELOAD=/path/to/libiwasm.so:/path/to/libharfbuzz.so.0.6XXXX.0
to preload them
Now you can use Gedit or any software that uses harfbuzz text shaping engine to use this font and have fun
(this won't work with browsers like firefox and chrome at the moment)
