Block Attribute Manager window (BATTMAN / ATTMAN)

BATTMAN and ATTMAN open a manager for the attribute definitions of one
attributed block: block chips with reference counts and a pick button,
a table whose columns are chosen with chips, move up/down, remove, and
an edit card (Attribute / Text / Properties) for the selected row. Apply,
OK and Sync write the list back to the block definition and, when asked,
rebuild the existing references keeping values through tag renames;
each is one undo step. Live changes are taken back on Cancel. Automation
gains attman_dialog.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/modules/insert/attman.rs

@@ -8,3 +8,44 @@ pub fn tool() -> ToolDef {
         event: ModuleEvent::Command("ATTMAN".to_string()),
     }
 }
+
+/// The Block Attribute Manager's "Select block" button: one block reference
+/// picked in the drawing, handed back as `_ATTMAN_PICK <hex handle>`.
+pub struct AttmanPickCommand;
+
+impl crate::command::CadCommand for AttmanPickCommand {
+    fn name(&self) -> &'static str {
+        "BATTMAN"
+    }
+
+    fn prompt(&self) -> String {
+        "Select a block:".into()
+    }
+
+    fn needs_entity_pick(&self) -> bool {
+        true
+    }
+
+    fn entity_pick_highlights_hover(&self) -> bool {
+        true
+    }
+
+    fn on_entity_pick(&mut self, handle: codec::Handle, _pt: glam::DVec3) -> crate::command::CmdResult {
+        if handle.is_null() {
+            return crate::command::CmdResult::NeedPoint;
+        }
+        crate::command::CmdResult::Dispatch(format!("_ATTMAN_PICK {:X}", handle.value()))
+    }
+
+    fn on_point(&mut self, _pt: glam::DVec3) -> crate::command::CmdResult {
+        crate::command::CmdResult::NeedPoint
+    }
+
+    fn on_enter(&mut self) -> crate::command::CmdResult {
+        crate::command::CmdResult::Dispatch("_ATTMAN_PICK".into())
+    }
+
+    fn on_escape(&mut self) -> crate::command::CmdResult {
+        crate::command::CmdResult::Dispatch("_ATTMAN_PICK".into())
+    }
+}

src/modules/insert/mod.rs

@@ -2,7 +2,7 @@
 
 mod attdef;
 pub(crate) mod attedit;
-mod attman;
+pub(crate) mod attman;
 pub mod base_point;
 pub(crate) mod block_cmdline;
 mod content_browser;