photokit 0.2.0

Safe Rust bindings for Apple's Photos framework — photo library access on macOS
Documentation 
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use core::fmt;
use std::ffi::CStr;

use serde::{Deserialize, Serialize};

use crate::ffi;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
#[non_exhaustive]
pub enum PHAuthorizationStatus {
    NotDetermined,
    Restricted,
    Denied,
    Authorized,
    Limited,
    Unknown(i32),
}

impl PHAuthorizationStatus {
    pub(crate) const fn from_raw(raw: i32) -> Self {
        match raw {
            0 => Self::NotDetermined,
            1 => Self::Restricted,
            2 => Self::Denied,
            3 => Self::Authorized,
            4 => Self::Limited,
            other => Self::Unknown(other),
        }
    }

    pub const fn is_authorized(self) -> bool {
        matches!(self, Self::Authorized | Self::Limited)
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct NSErrorInfo {
    pub domain: String,
    pub code: i64,
    pub message: String,
}

impl fmt::Display for NSErrorInfo {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{} ({}) [{}]", self.message, self.code, self.domain)
    }
}

#[derive(Debug, Clone, PartialEq, Eq)]
#[non_exhaustive]
pub enum PhotoKitError {
    InvalidArgument(String),
    Framework(NSErrorInfo),
    OperationFailed(String),
}

impl fmt::Display for PhotoKitError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::InvalidArgument(message) => write!(f, "invalid argument: {message}"),
            Self::Framework(error) => write!(f, "Photos.framework error: {error}"),
            Self::OperationFailed(message) => write!(f, "photokit operation failed: {message}"),
        }
    }
}

impl std::error::Error for PhotoKitError {}

impl PhotoKitError {
    pub(crate) unsafe fn from_error_ptr(error_ptr: *mut core::ffi::c_char, fallback: &str) -> Self {
        if error_ptr.is_null() {
            return Self::OperationFailed(fallback.to_owned());
        }

        let message = CStr::from_ptr(error_ptr).to_string_lossy().into_owned();
        ffi::ph_string_free(error_ptr);

        if let Ok(payload) = serde_json::from_str::<NSErrorInfo>(&message) {
            Self::Framework(payload)
        } else {
            Self::OperationFailed(message)
        }
    }
}