gpui-kit-markdown-editor 0.1.0

A block-based WYSIWYG Markdown editor for GPUI, built on gpui-kit's editor host API.
Documentation 
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use std::num::NonZeroU64;
use std::sync::atomic::{AtomicU64, Ordering};

/// Opaque, process-unique block identity (design D1).
///
/// Allocated from a global counter like `dock::layout::tree::next_node_id`
/// and never reused, so an id from a removed block, another document, or a
/// state from before `set_source` can only fail lookup; it can never alias a
/// live block.
#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord, Debug)]
pub struct BlockId(NonZeroU64);

static NEXT_BLOCK_ID: AtomicU64 = AtomicU64::new(1);

impl BlockId {
    pub(crate) fn next() -> Self {
        let raw = NEXT_BLOCK_ID.fetch_add(1, Ordering::Relaxed);
        // The counter starts at 1 and would need 2^64 allocations to wrap.
        Self(NonZeroU64::new(raw).unwrap_or(NonZeroU64::MIN))
    }

    /// The raw value, for debugging and logging only.
    pub fn as_u64(self) -> u64 {
        self.0.get()
    }
}