Delete Face (face.delete, and faces in the Delete selection): a timeline feature that removes faces and heals the gap from the neighbouring planes through kernel::delete_faces; a picked face brings the rest of its surface (both halves of a hole's wall); face picks are stored by persistent name; a face its neighbours can't close is refused with the kernel's reason

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/cmd/delete.rs

@@ -6,6 +6,7 @@
 
 use serde_json::{Value, json};
 use solvecraft_doc::FeatureKind;
+use solvecraft_geom::Vec3;
 
 use super::CommandSpec;
 use crate::params::{bad, bool_};
@@ -63,6 +64,7 @@ fn apply(s: &mut Session, p: &Value) -> Result<Value> {
     let mut entities = Vec::new();
     let mut features: Vec<u64> = Vec::new();
     let mut bodies: Vec<String> = Vec::new();
+    let mut faces: Vec<(String, Vec<Vec3>)> = Vec::new();
     for x in &items {
         match x {
             Sel::SketchCurve { id } | Sel::SketchPoint { id } | Sel::SketchConstraint { id } => entities.push(id.clone()),
@@ -78,7 +80,10 @@ fn apply(s: &mut Session, p: &Value) -> Result<Value> {
             },
             Sel::Axis { .. } => skip("the origin axes can't be deleted".into()),
             Sel::Body { name } => bodies.push(name.clone()),
-            Sel::Face { .. } => skip("Delete Face: not available yet".into()),
+            Sel::Face { body, point, .. } => match faces.iter_mut().find(|(b, _)| b == body) {
+                Some((_, ps)) => ps.push(*point),
+                None => faces.push((body.clone(), vec![*point])),
+            },
             Sel::Edge { .. } | Sel::Vertex { .. } => skip("edges and vertices are deleted with their body or face".into()),
             Sel::Profile { .. } => skip("a profile goes with its sketch".into()),
         }
@@ -93,6 +98,11 @@ fn apply(s: &mut Session, p: &Value) -> Result<Value> {
             done = true;
         }
     }
+    // Faces of a body that is going anyway are left to it; the rest become Delete Face features.
+    for (body, points) in faces.iter().filter(|(b, _)| !bodies.contains(b)) {
+        sub(s, "face.delete", json!({ "faces": points, "body": body }))?;
+        done = true;
+    }
     if !features.is_empty() {
         let ids: Vec<String> = features.iter().map(u64::to_string).collect();
         sub(s, "timeline.delete", json!({ "features": ids }))?;

crates/engine/src/cmd/features.rs

@@ -66,6 +66,10 @@ pub static COMMANDS: &[CommandSpec] = &[
         .at("SOLID", "MODIFY")
         .icon("scale")
         .params("bodies: [names]; factor: expr | factors: [x, y, z] exprs; origin?: [x,y,z]"),
+    CommandSpec::new("face.delete", "Delete Face", delete_face)
+        .at("SOLID", "MODIFY")
+        .icon("delete")
+        .params("faces: [[x,y,z] points on the faces]; body?. The neighbouring planes close the gap (a fillet, chamfer, hole or boss taken off)"),
     CommandSpec::new("solid.offset_face", "Offset Face", offset_face)
         .at("SOLID", "MODIFY")
         .icon("offset_face")
@@ -1188,6 +1192,11 @@ fn scale(s: &mut Session, p: &Value) -> Result<Value> {
     add_feature(s, p, FeatureKind::Scale { bodies, origin, factor, factors })
 }
 
+fn delete_face(s: &mut Session, p: &Value) -> Result<Value> {
+    let faces = face_points(p, "face.delete")?;
+    add_feature(s, p, FeatureKind::DeleteFace { faces, body: str_(p, "body").map(str::to_string) })
+}
+
 fn offset_face(s: &mut Session, p: &Value) -> Result<Value> {
     let cmd = "solid.offset_face";
     let faces = face_points(p, cmd)?;