# cmeta

> [!WARNING]
> Work in progress. This is not finished at all, I'm just experimenting.

Single Heaer Meta Programming Header Library for C. The same header for both codegen and runtime.

## Current limitations

- Only parses `typedef struct { ... } type_name;`
- Will generate colliding definitions in case of types with the same name
- Parsing expects more or less correct code, if you forget a semi it will generating bad code

## Quick start

1. Create `main.c`

```c
typedef struct { 
    int int_field;
    const char *const_char_star_field;
} My_Struct;

int main(void) {
    return 0;
}
```

2. Create `cmeta.c`

You only have to call `process_file` with a file to generate type infos etc in `cmeta.h`.

```c
#define CMETA_COMPTIME
#include "cmeta.h"

int main(void) {
    if (!process_file("./main.c")) return 1;
    return 0;
}
```

3. Build and run cmeta

```console
$ gcc cmeta.c -o cmeta
$ ./cmeta
```

4. Enjoy!

You can now inspect your types!

```c
#include "cmeta.h"

typedef struct { 
    int int_field;
    const char* const_char_star_field;
} My_Struct;

int main(void) {
    printf("My_Struct.name = %s\n", my_struct_info.name);
    printf("My_Struct.fields_count = %zu\n", my_struct_info.fields_count);
    return 0;
}
```

```console
$ gcc main.c -o main
$ ./main
My_Struct.name = My_Struct
My_Struct.fields_count = 2
```

> [!NOTE]
> It runs `gcc -E`, so it handles macros etc.