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COMPILING.md

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Compiling Prism

Prism uses emscripten and mruby to make a wasm-based Ruby interpreter, as well as browserify and snabbdom to build the JS runtime.

When working on Prism itself, you should use ./bin/prism rather than the prism binary. Since all libraries are relative to the path of the prism binary, any changes you make should apply after running the appropriate build step.

Prerequisites

Our repo contains a number of submodules, so if these are not already initialized you'll want to do that first.

git submodule update --init --recursive

To build the mruby interpreter or the Prism C runtime, you'll need emscripten 1.38.46.

If you haven't yet installed emscripten 1.38.46, you can do so using emsdk.

git clone https://github.com/emscripten-core/emsdk.git

./emsdk/emsdk install 1.38.46
./emsdk/emsdk activate 1.38.46

Then, to activate the emscripten environment, run:

source ./emsdk/emsdk_env.sh

Building the mruby interpreter

Creates the mruby interpreter object files.

make patch-mruby && make mruby-build

Building the Prism C runtime

Creates the Prism C runtime, outputs to build/. Requires the mruby interpreter to be built.

make runtime

Building the JS Runtime

If you change src/prism.js you'll need to run rebuild build/prism.js to see your changes.

make build/prism.js