**This parser is not actively maintained** since it has been replaced by [Kconfig](https://www.kernel.org/doc/html/next/kbuild/kconfig-language.html). This library has been tested from linux kernel [1.0](https://cdn.kernel.org/pub/linux/kernel/v1.0/) to [2.5.44](https://cdn.kernel.org/pub/linux/kernel/v2.5/) (542 versions).
A Config.in file looks like this:
```
# 2.5.0/arch/i386/config.in
mainmenu_name "Linux Kernel Configuration"
define_bool CONFIG_X86 y
define_bool CONFIG_ISA y
define_bool CONFIG_SBUS n
define_bool CONFIG_UID16 y
mainmenu_option next_comment
comment 'Code maturity level options'
bool 'Prompt for development and/or incomplete code/drivers' CONFIG_EXPERIMENTAL
endmenu
```
## Getting started
```bash
cargo add nom-config-in
``````
```rust
use nom_config_in::{parse_config_in, ConfigInFile, ConfigInInput};
use std::path::PathBuf;
// curl https://cdn.kernel.org/pub/linux/kernel/v2.5/linux-2.5.0.tar.xz | tar -xJ -C /tmp/
fn main() -> Result<(), Box> {
let config_in_file = ConfigInFile::new(
PathBuf::from("/tmp/linux/"),
PathBuf::from("/tmp/linux/arch/i386/config.in"),
);
let input = config_in_file.read_to_string().unwrap();
let config_in = parse_config_in(ConfigInInput::new_extra(&input, config_in_file));
println!("{:?}", config_in);
Ok(())
}
```
## Resources
- https://lwn.net/Articles/8117/
- https://os.inf.tu-dresden.de/l4env/doc/html/bid-spec/node36.html
- https://github.com/xfguo/menuconfig/blob/master/config-language.txt
