Merge pull request #84 from harrisonoconnorhover/codex/text-box-editing

Allow editing and selecting text inside worksheet text boxes

crates/engine/src/cmd/insert.rs

@@ -122,6 +122,7 @@ pub fn specs() -> Vec<CommandSpec> {
             s,
             &with(p, "kind", json!("textBox"))
         )),
+        cmd!("shape.setText", "Edit Text Box", [], None, "{id: textBox id, text: string}", has_doc, shape_set_text),
         cmd!("object.delete", "Delete Object", [], None, "{kind: chart|image|shape, id}", has_doc, delete_object),
         cmd!("object.move", "Move Object", [], None, "{kind: chart|image|shape, id, at?: \"C3\", dx?, dy?, width?, height?}", has_doc, move_object),
         cmd!(
@@ -776,6 +777,37 @@ fn insert_shape(s: &mut Session, p: &Json) -> Result<Json> {
     })
 }
 
+/// A text box holds at most as many characters as a cell.
+const SHAPE_TEXT_MAX_CHARS: usize = 32_767;
+
+fn shape_set_text(s: &mut Session, p: &Json) -> Result<Json> {
+    let id =
+        p.get("id").and_then(Json::as_u64).and_then(|id| u32::try_from(id).ok()).ok_or_else(|| bad("shape.setText", "`id` must be a text box id"))?;
+    let text = str_param(p, "text").ok_or_else(|| bad("shape.setText", "`text` must be a string"))?;
+    if text.chars().nth(SHAPE_TEXT_MAX_CHARS).is_some() {
+        return Err(bad("shape.setText", "`text` is longer than 32,767 characters"));
+    }
+    let d = s.doc()?;
+    let sheet = d.wb.active_sheet;
+    let sh = d.wb.active().ok_or_else(|| bad("shape.setText", "no such text box"))?;
+    let shape = sh.shapes.iter().find(|shape| shape.id == id).ok_or_else(|| bad("shape.setText", "no such text box"))?;
+    if shape.kind != ShapeKind::TextBox {
+        return Err(bad("shape.setText", "the shape is not a text box"));
+    }
+    // Sheet protection locks drawing objects (there is no "edit objects" allowance yet).
+    if sh.is_protected() {
+        return Err(EngineError::Other(PROTECTED.into()));
+    }
+    if shape.text == text {
+        return ok();
+    }
+    edit(s, |cx| {
+        let shape = cx.sheet_mut(sheet)?.shapes.iter_mut().find(|shape| shape.id == id).ok_or_else(|| bad("shape.setText", "no such text box"))?;
+        shape.text = text.into();
+        Ok(Json::Null)
+    })
+}
+
 fn delete_object(s: &mut Session, p: &Json) -> Result<Json> {
     let id = u32_param(p, "id").ok_or_else(|| bad("object.delete", "missing `id`"))?;
     let kind = str_param(p, "kind").unwrap_or("").to_string();