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107 lines
3.6 KiB
Markdown
107 lines
3.6 KiB
Markdown
[](https://crates.io/crates/libnotcurses-sys)
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[](https://dankamongmen.github.io/notcurses/rustdoc/libnotcurses_sys/)
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[](https://blog.rust-lang.org/2020/11/19/Rust-1.48.html)
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`libnotcurses-sys` is a low-level Rust wrapper for the
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[notcurses C library](https://www.github.com/dankamongmen/notcurses/)
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This library is built with several layers of zero-overhead abstractions
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over the C functions and pointers accessed through FFI.
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# How to use this library
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There are basically two ways: The [**Rust way**](#1-the-rust-way),
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and the [**C way**](#2-the-c-way). (Or a mix of both).
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## 1. The Rust way
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Where you use the more safely wrapped types, with its methods and constructors,
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and painless error handling, like this:
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```rust
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use libnotcurses_sys::*;
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fn main() -> NcResult<()> {
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let mut nc = Nc::with_flags(NCOPTION_NO_ALTERNATE_SCREEN)?;
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let plane = nc.stdplane();
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plane.putstr("hello world")?;
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nc.render()?;
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nc.stop()?;
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Ok(())
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}
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```
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Although you still have to manually call the `stop()` method for `Nc`
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and `NcDirect` objects, and the `destroy()` method for the rest of types that
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allocate, (like `NcPlane`, `NcMenu`…) at the end of their scope, since the Drop
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trait is not implemented for any wrapping type in libnotcurses-sys.
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But they do implement methods and use `NcResult` as the return type,
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for handling errors in the way we are used to in Rust.
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For the types that don't allocate, most are based on primitives like `i32`,
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`u32`, `u64`… without a name in the C library. In Rust they are type aliased
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(e.g.: `NcChannel`, `NcChannelPair`, `NcRgb`, `NcColor`…), to
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leverage type checking, and they implement methods through traits
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(e.g. `NcChannelMethods` must be in scope to use the `NcChannel` methods.
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## 2. The C way
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You can always use the C API functions directly if you prefer,
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in a very similar way as the C library is used.
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It requires the use of unsafe, since most functions are wrapped directly
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by `bindgen` marked as such.
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Error handling is done this way by checking the returned `NcIntResult`,
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or in case of receiving a pointer, by comparing it to `null_mut()`.
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### Example
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```rust
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use core::ptr::{null, null_mut};
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use std::process::exit;
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use libnotcurses_sys::*;
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fn main() {
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let options = ffi::notcurses_options {
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termtype: null(),
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renderfp: null_mut(),
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loglevel: 0,
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margin_t: 0,
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margin_r: 0,
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margin_b: 0,
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margin_l: 0,
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flags: NCOPTION_NO_ALTERNATE_SCREEN,
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};
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unsafe {
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let nc = notcurses_init(&options, null_mut());
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if nc == null_mut() {
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exit(1);
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}
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let plane = notcurses_stdplane(nc);
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let cols = ncplane_putstr(&mut *plane, "hello world");
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if cols < NCRESULT_OK {
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notcurses_stop(nc);
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exit(cols.abs());
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}
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if notcurses_stop(nc) < NCRESULT_OK {
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exit(2);
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}
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}
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}
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```
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### The `notcurses` C API docs
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- [API reference (man pages)](https://notcurses.com/)
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- [Wiki Page](https://nick-black.com/dankwiki/index.php/Notcurses)
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- [The Book Guide (pdf)](https://nick-black.com/htp-notcurses.pdf)
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- [USAGE.md](https://github.com/dankamongmen/notcurses/blob/master/USAGE.md)
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- [HACKING.md](https://github.com/dankamongmen/notcurses/blob/master/doc/HACKING.md)
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- [Doxygen Documentation](https://nick-black.com/notcurses/html/index.html)
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- [FOSDEM 2021 presentation](https://fosdem.org/2021/schedule/event/notcurses/)
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