feat: add markdown editing mode

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/hyperlog-tui/src/commands/open_item.rs

@@ -0,0 +1,59 @@
+use crate::{
+    models::{IOEvent, Msg},
+    querier::Querier,
+    state::SharedState,
+};
+
+pub struct OpenItemCommand {
+    querier: Querier,
+}
+
+impl OpenItemCommand {
+    pub fn new(querier: Querier) -> Self {
+        Self { querier }
+    }
+
+    pub fn command(self, root: &str, path: Vec<String>) -> super::Command {
+        let root = root.to_string();
+
+        super::Command::new(|dispatch| {
+            tokio::spawn(async move {
+                dispatch.send(Msg::OpenItem(IOEvent::Initialized));
+
+                let item = match self.querier.get_async(&root, path).await {
+                    Ok(item) => match item {
+                        Some(item) => {
+                            dispatch.send(Msg::OpenItem(IOEvent::Success(())));
+                            item
+                        }
+                        None => {
+                            dispatch.send(Msg::OpenItem(IOEvent::Failure(
+                                "failed to find a valid item for path".into(),
+                            )));
+
+                            return;
+                        }
+                    },
+                    Err(e) => {
+                        dispatch.send(Msg::OpenItem(IOEvent::Failure(e.to_string())));
+
+                        return;
+                    }
+                };
+
+                dispatch.send(Msg::OpenEditor { item });
+            });
+            None
+        })
+    }
+}
+
+pub trait OpenItemCommandExt {
+    fn open_item_command(&self) -> OpenItemCommand;
+}
+
+impl OpenItemCommandExt for SharedState {
+    fn open_item_command(&self) -> OpenItemCommand {
+        OpenItemCommand::new(self.querier.clone())
+    }
+}