newt 0.6.4

Rust bindings for the Newt console UI library
Documentation 
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//
// Copyright (C) 2019 Robert Gill <locke@sdf.org>
//
// This file is a part of newt-rs.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License version 2.1 as published by the Free Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

use std::ffi::CString;
use std::os::raw::{c_int,c_void};
use std::{char,ptr};

#[cfg(feature = "asm")]
use std::os::raw::c_char;

use newt_sys::*;
use crate::component::Component;
use crate::widgets::{Entry,Form};

use crate::Callback;
use crate::callbacks::EntryFilter;
use crate::callbacks::HelpCallback;
use crate::callbacks::SuspendCallback;
use crate::intern::Child;

pub fn char_slice_to_cstring(slice: &[char]) -> CString {
    let mut vec: Vec<u8> = Vec::new();
    for c in slice.iter() {
        let mut b = [0; 1];
        let ch = c.encode_utf8(&mut b);
        vec.push(ch.as_bytes()[0]);
    }

    let string = String::from_utf8_lossy(vec.as_slice());
    CString::new(string.into_owned()).unwrap()
}

#[cfg(feature = "asm")]
pub fn str_slice_to_cstring_vec(slice: &[&str]) -> Vec<CString> {
    let mut vec = Vec::new();
    for s in slice.iter() {
        vec.push(CString::new(*s).unwrap());
    }
    vec
}

#[cfg(feature = "asm")]
pub fn cstring_vec_to_ptrs(strings: &[CString]) -> Vec<*const c_char> {
    let mut vec = Vec::new();
    for s in strings.iter() {
        vec.push(s.as_ptr());
    }
    vec.push(ptr::null());
    vec
}

unsafe extern "C"
fn callback<'a, FN: 'a, T: 'a>(co: newtComponent, data: *mut c_void)
where FN: FnMut(&dyn Component, Option<&T>)
{
    let cb = &mut *(data as *mut Callback<'a, FN, T>);
    cb.call(co);
}

unsafe extern "C"
fn help_callback<FN, T>(co: newtComponent, data: *mut c_void)
where FN: FnMut(&Form, Option<&T>)
{
    if data.is_null() { return; };
    let cb = &mut *(data as *mut HelpCallback<FN, T>);
    let form = Form::new_co(co);
    form.add_to_parent().unwrap();
    cb.call(&form);
}

unsafe extern "C"
fn suspend_callback<FN, T>(data: *mut c_void)
where FN: FnMut(Option<&T>)
{
    let cb = &mut *(data as *mut SuspendCallback<FN, T>);
    cb.call();
}

unsafe extern "C"
fn entry_filter<'a, FN: 'a, T: 'a>
  (entry: newtComponent, data: *mut c_void, ch: c_int, cursor: c_int) -> i32
where FN: FnMut(&Entry, Option<&T>, char, i32) -> char
{
    let cb = &mut *(data as *mut EntryFilter<'a, FN, T>);
    let ch = char::from_u32(ch as u32).unwrap();
    cb.call(entry, ch, cursor) as i32
}

pub fn newt_set_callback<'a, FN: 'a, T: 'a>
  (co: newtComponent, cb: &Callback<'a, FN, T>)
where FN: FnMut(&dyn Component, Option<&T>)
{
    unsafe {
        let c_ptr = cb as *const _ as *mut c_void;
        newtComponentAddCallback(co, Some(callback::<FN, T>), c_ptr);
    }
}

pub fn newt_unset_callback(co: &dyn Component)
{
    unsafe {
        newtComponentAddCallback(co.co(), None, ptr::null_mut());
    }
}

pub fn newt_init_help_callback<FN, T>(_cb: &HelpCallback<FN, T>)
where FN: FnMut(&Form, Option<&T>)
{
    unsafe { newtSetHelpCallback(Some(help_callback::<FN, T>)); }
}

pub fn newt_set_suspend_callback<FN, T>(cb: &SuspendCallback<FN, T>)
where FN: FnMut(Option<&T>)
{
    unsafe {
        let c_ptr = cb as *const _ as *mut c_void;
        newtSetSuspendCallback(Some(suspend_callback::<FN, T>), c_ptr);
    }
}

pub fn newt_unset_suspend_callback()
{
    unsafe { newtSetSuspendCallback(None, ptr::null_mut()); }
}

pub fn newt_entry_set_filter<'a, FN: 'a, T: 'a>(
    co: newtComponent,
    cb: &EntryFilter<'a, FN, T>
)
where FN: FnMut(&Entry, Option<&T>, char, i32) -> char
{
    unsafe {
        let c_ptr = cb as *const _ as *mut c_void;
        newtEntrySetFilter(co, Some(entry_filter::<FN, T>), c_ptr)
    }
}