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fun/docs/handbook.md
2025-11-25 00:51:48 +01:00

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# Fun Handbook
## Overview
## Introduction
## Installation
### Requirements
A C compiler, a libc and [Git](https://git-scm.com/).
#### FreeBSD
- [CMake](https://cmake.org/)
- [Clang](https://clang.llvm.org/)
#### Linux
- [CMake](https://cmake.org/)
- [GCC](https://gcc.gnu.org/) (Clang should work here too, not tested!)
#### Windows
This requires Cygwin to be installed and configured. I will not cover this here.
- [CMake](https://cmake.org/)
- [Cygwin](https://cygwin.com/) using [GCC](https://gcc.gnu.org/)
### Build Fun
Linux/UNIX and Cygwin only covered here for now.
Clone repository:
```bash
git clone https://git.xw3.org/fun/fun.git
```
Change directory:
```bash
cd fun
```
Build:
```bash
# Note: Every -D flag must be of the form NAME=VALUE (e.g., -DFUN_WITH_REPL=ON)
cmake -S . -B build -DFUN_DEBUG=OFF -DFUN_WITH_PCSC=OFF -DFUN_WITH_REPL=ON -DFUN_WITH_JSON=ON
cmake --build build --target fun
```
That's it! For testing it, run:
```bash
FUN_LIB_DIR="$(pwd)/lib" ./build/fun ./demo.fun
```
To see what's going on, run:
```bash
FUN_LIB_DIR="$(pwd)/lib" ./build/fun --trace ./demo.fun
```
To switch into the REPL after an error, run:
```bash
FUN_LIB_DIR="$(pwd)/lib" ./build/fun --repl-on-error --trace ./demo.fun
```
Both --repl-on-error and --trace are optional but can always be combined. To get
more debug information, you need to build Fun with -DFUN_DEBUG=ON.
To directly run the REPL, you have to run:
```bash
FUN_LIB_DIR="$(pwd)/lib" ./build/fun
```
But be sure to build Fun with -DFUN_WITH_REPL=ON.
#### CMake options
All CMake options must be passed as -DNAME=VALUE:
- FUN_DEBUG=ON|OFF — verbose debug logging in the VM (default OFF)
- FUN_WITH_REPL=ON|OFF — enable the interactive REPL (default ON)
- FUN_WITH_PCSC=ON|OFF — enable PC/SC smart card support (default OFF)
- FUN_WITH_JSON=ON|OFF — enable JSON support via json-c (default OFF)
If you encounter an error such as:
CMake Error: Parse error in command line argument: FUN_WITH_JSON
Should be: VAR:type=value
then a -D option was given without a value. Always use -DNAME=VALUE, for example -DFUN_WITH_JSON=ON.
### Install Fun to OS
I do not recommend installing Fun on your system because it is in a very early
stage of development, but I can say that I have Fun installed on my system. If
you want to do that too, type:
```bash
sudo cmake --build build --target install
```
Now run Fun without prefixed FUN_LIB_DIR="$(pwd)/lib" because libs are installed to the
system default lib directory (/usr/share/fun/lib).
## Usage
```bash
fun ./demo.fun
```