Hard-coded document schema

src/document.rs

@@ -1,8 +1,9 @@
+use std::cell::RefCell;
 use std::fmt;
 
 use anyhow::Result;
 use automerge::transaction::Transactable;
-use automerge::{AutoCommit, AutoSerde, Patch};
+use automerge::{AutoCommit, AutoSerde, ObjId, ObjType, Patch, ReadDoc};
 
 /// Hard-coded automerge document schema in bytes representation for "Aardvark".
 ///
@@ -12,21 +13,28 @@ use automerge::{AutoCommit, AutoSerde, Patch};
 ///
 /// Read more here:
 /// <https://automerge.org/docs/cookbook/modeling-data/#setting-up-an-initial-document-structure>
-const DOCUMENT_SCHEMA: [u8] = [1, 2, 3];
+const DOCUMENT_SCHEMA: [u8; 119] = [
+    133, 111, 74, 131, 14, 200, 8, 95, 0, 109, 1, 16, 163, 64, 79, 49, 42, 30, 77, 109, 146, 45,
+    91, 5, 214, 2, 217, 205, 1, 252, 203, 208, 39, 6, 89, 188, 223, 101, 41, 50, 160, 144, 47, 147,
+    187, 74, 77, 252, 185, 64, 18, 211, 205, 23, 118, 97, 221, 216, 176, 1, 239, 6, 1, 2, 3, 2, 19,
+    2, 35, 2, 64, 2, 86, 2, 7, 21, 5, 33, 2, 35, 2, 52, 1, 66, 2, 86, 2, 128, 1, 2, 127, 0, 127, 1,
+    127, 1, 127, 0, 127, 0, 127, 7, 127, 3, 100, 111, 99, 127, 0, 127, 1, 1, 127, 4, 127, 0, 127,
+    0, 0,
+];
 
 /// Identifier in automerge document path where we store the text.
 const DOCUMENT_OBJ_ID: &str = "doc";
 
-#[derive(Debug)]
 pub struct Document {
     doc: RefCell<AutoCommit>,
 }
 
 impl Document {
+    #[allow(dead_code)]
     pub fn new() -> Self {
-        let doc = AutoCommit::new();
+        let mut doc = AutoCommit::new();
         doc.put_object(automerge::ROOT, DOCUMENT_OBJ_ID, ObjType::Text)
-            .expect("inserting text object '{DOCUMENT_OBJ_ID}' at root");
+            .expect("inserting text object at root");
         Self {
             doc: RefCell::new(doc),
         }
@@ -39,9 +47,19 @@ impl Document {
         }
     }
 
+    fn text_object(&self) -> ObjId {
+        let doc = self.doc.borrow();
+        let (_value, obj_id) = doc
+            .get(automerge::ROOT, DOCUMENT_OBJ_ID)
+            .unwrap_or_default()
+            .expect("text object at root");
+        obj_id
+    }
+
     pub fn update(&mut self, position: i32, del: i32, text: &str) -> Result<()> {
+        let text_obj = self.text_object();
         let mut doc = self.doc.borrow_mut();
-        doc.splice_text(&root, position as usize, del as isize, text)?;
+        doc.splice_text(&text_obj, position as usize, del as isize, text)?;
         // Move the diff pointer forward to current position
         doc.update_diff_cursor();
         Ok(())
@@ -59,9 +77,9 @@ impl Document {
     }
 
     pub fn text(&self) -> String {
+        let text_obj = self.text_object();
         let doc = self.doc.borrow();
-        let obj = doc.get(automerge::ROOT, DOCUMENT_OBJ_ID);
-        doc.text(&obj)
+        doc.text(&text_obj)
             .expect("text to be given in automerge document")
     }
 
@@ -84,8 +102,8 @@ impl Default for Document {
 
 impl fmt::Debug for Document {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut doc = self.doc.borrow();
-        let json = serde_json::to_string_pretty(&AutoSerde::from(doc))
+        let doc = self.doc.borrow();
+        let json = serde_json::to_string_pretty(&AutoSerde::from(&*doc))
             .expect("serialize automerge document to JSON");
         write!(f, "{}", json)
     }