config: format sources before commit

crates/workspace-server/src/config_source.rs

@@ -456,6 +456,40 @@ fn normalize_main_config_schema_assertion(
     ConfigTreeSnapshot::from_entries(revision, entries).map_err(config_error)
 }
 
+fn format_candidate_sources(
+    snapshot: ConfigTreeSnapshot,
+    changes: &[ConfigTreeChange],
+) -> Result<ConfigTreeSnapshot> {
+    let mut paths = std::collections::BTreeSet::from([main_config_path()]);
+    for change in changes {
+        match change {
+            ConfigTreeChange::Create { path, .. } | ConfigTreeChange::Update { path, .. } => {
+                paths.insert(path.clone());
+            }
+            ConfigTreeChange::Rename { to, .. } => {
+                paths.insert(to.clone());
+            }
+            ConfigTreeChange::Delete { .. } => {}
+        }
+    }
+
+    let environment = SnapshotEnvironment::new(snapshot.clone());
+    let revision = snapshot.revision;
+    let mut entries = Vec::with_capacity(snapshot.entries.len());
+    for entry in snapshot.entries.into_values() {
+        if paths.contains(&entry.path) && entry.content_type == ConfigContentType::Decodal {
+            let formatted = environment.format(&entry.content).map_err(config_error)?;
+            entries.push(
+                ConfigEntry::new(entry.path, entry.content_type, formatted)
+                    .map_err(config_error)?,
+            );
+        } else {
+            entries.push(entry);
+        }
+    }
+    ConfigTreeSnapshot::from_entries(revision, entries).map_err(config_error)
+}
+
 fn evaluate_candidate(
     current: WorkspaceConfigState,
     changes: &[ConfigTreeChange],
@@ -465,6 +499,7 @@ fn evaluate_candidate(
     let snapshot = current.snapshot.apply(changes).map_err(config_error)?;
     ensure_main_entrypoint(&snapshot)?;
     let snapshot = normalize_main_config_schema_assertion(snapshot)?;
+    let snapshot = format_candidate_sources(snapshot, changes)?;
     let contract = main_config_contract_with_schema(schema_bundle);
     let evaluation = SnapshotEnvironment::new(snapshot.clone())
         .evaluate_contract(&contract)
@@ -1322,7 +1357,7 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn candidate_normalizes_main_schema_assertion_only_for_entrypoint() {
+    async fn candidate_normalizes_main_and_formats_changed_decodal_sources() {
         let store = open_store().await;
         let current = store.load_workspace_config("w-config").unwrap().unwrap();
         let candidate = store
@@ -1356,7 +1391,7 @@ mod tests {
                 .get(&path("module.dcdl"))
                 .unwrap()
                 .content,
-            "{}"
+            "{}\n"
         );
     }
 

web/workspace/src/lib/workspace/config-source/ConfigSourceEditor.svelte

@@ -130,28 +130,72 @@
     }
   }
 
+  async function formatDraftSources() {
+    if (!toolchain || !treeState || !baseSnapshot) return;
+    await stageCurrent();
+    const paths = new Set<string>();
+    for (const change of draftChanges) {
+      if (change.kind === "create" || change.kind === "update") paths.add(change.path);
+      if (change.kind === "rename") paths.add(change.to);
+    }
+
+    let candidate = treeState.snapshot;
+    let formattedAny = false;
+    for (const path of paths) {
+      const entry = candidate.entries[path];
+      if (!entry || entry.content_type !== "decodal") continue;
+      const formatted = await toolchain.format(entry.content);
+      if (formatted === entry.content) continue;
+      candidate = await toolchain.applyChanges([{
+        kind: "update",
+        path,
+        expected_digest: entry.content_digest,
+        content: formatted,
+      }]);
+      formattedAny = true;
+    }
+    if (!formattedAny) return;
+
+    treeState = { ...treeState, snapshot: candidate };
+    draftChanges = await toolchain.changesBetween(baseSnapshot, candidate);
+    source = candidate.entries[selectedPath]?.content ?? source;
+    preflightDigest = "";
+    candidateContract = null;
+    conflict = false;
+  }
+
+  async function requestCandidatePreview() {
+    if (!toolchain) throw new Error("config source toolchain is unavailable");
+    const candidate = await previewConfigTree(workspaceId, {
+      changes: draftChanges,
+      entrypoints: entrypoints(),
+    });
+    await toolchain.evaluate(candidate.contract);
+    diagnostics = [];
+    candidateContract = candidate.contract;
+    preflightDigest = candidate.snapshot.digest;
+    return candidate;
+  }
+
+  function recordCandidateError(error: unknown) {
+    const message = String(error);
+    conflict = message.includes("conflict") || message.includes("base revision/digest mismatch");
+    status = conflict ? `${message} Reload the authoritative tree before editing again.` : message;
+  }
+
   async function preview() {
     if (!treeState) return;
-    await stageCurrent();
-    if (draftChanges.length === 0) {
-      status = "No draft changes to preview.";
-      return;
-    }
     busy = true;
     try {
-      const candidate = await previewConfigTree(workspaceId, {
-        changes: draftChanges,
-        entrypoints: entrypoints(),
-      });
-      await toolchain?.evaluate(candidate.contract);
-      diagnostics = [];
-      candidateContract = candidate.contract;
-      preflightDigest = candidate.snapshot.digest;
+      await formatDraftSources();
+      if (draftChanges.length === 0) {
+        status = "No draft changes to preview.";
+        return;
+      }
+      const candidate = await requestCandidatePreview();
       status = `Preview valid · projection ${candidate.evaluation.projection_digest.slice(0, 20)}…`;
     } catch (error) {
-      const message = String(error);
-      conflict = message.includes("conflict") || message.includes("base revision/digest mismatch");
-      status = conflict ? `${message} Reload the authoritative tree before editing again.` : message;
+      recordCandidateError(error);
     } finally {
       busy = false;
     }
@@ -159,39 +203,38 @@
 
   async function commit() {
     if (!treeState) return;
-    await stageCurrent();
-    if (draftChanges.length === 0) {
-      status = "No draft changes to commit.";
-      return;
-    }
-    if (preflightDigest !== treeState.snapshot.digest || !candidateContract) {
-      status = "Preview the complete candidate successfully before Commit.";
-      return;
-    }
     busy = true;
     try {
+      await formatDraftSources();
+      if (draftChanges.length === 0) {
+        status = "No draft changes to commit.";
+        return;
+      }
+      if (preflightDigest !== treeState.snapshot.digest || !candidateContract) {
+        await requestCandidatePreview();
+      }
+      const contract = candidateContract;
+      if (!contract) throw new Error("candidate preview did not return a toolchain contract");
       treeState = await commitConfigTree(workspaceId, {
         base_revision: baseRevision,
         base_digest: baseDigest,
         changes: draftChanges,
-        entrypoints: candidateContract.entrypoints,
-        toolchain_fingerprint: candidateContract.fingerprint,
+        entrypoints: contract.entrypoints,
+        toolchain_fingerprint: contract.fingerprint,
       });
       draftChanges = [];
       preflightDigest = "";
-    candidateContract = null;
-    conflict = false;
+      candidateContract = null;
+      conflict = false;
       baseSnapshot = $state.snapshot(treeState.snapshot);
       baseRevision = treeState.snapshot.revision;
       baseDigest = treeState.snapshot.digest;
       await toolchain?.setSnapshot(treeState.snapshot, treeState.contract.schema_bundle);
       source = treeState.snapshot.entries[selectedPath]?.content ?? "";
       diagnostics = [];
-      status = `Committed revision ${treeState.snapshot.revision}.`;
+      status = `Committed formatted revision ${treeState.snapshot.revision}.`;
     } catch (error) {
-      const message = String(error);
-      conflict = message.includes("conflict") || message.includes("base revision/digest mismatch");
-      status = conflict ? `${message} Reload the authoritative tree before editing again.` : message;
+      recordCandidateError(error);
     } finally {
       busy = false;
     }

web/workspace/test/config-source/editor-state.test.ts

@@ -98,3 +98,33 @@ Deno.test("main entrypoint always enables the fixed schema wrapper", async () =>
     "the authoritative main source should not require an optional client-side conversion",
   );
 });
+
+Deno.test("preview and commit format every draft Decodal source", async () => {
+  const source = await Deno.readTextFile(
+    new URL(
+      "../../src/lib/workspace/config-source/ConfigSourceEditor.svelte",
+      import.meta.url,
+    ),
+  );
+
+  assert(
+    source.includes("async function formatDraftSources()") &&
+      source.includes('change.kind === "create" || change.kind === "update"') &&
+      source.includes('change.kind === "rename"') &&
+      source.includes('entry.content_type !== "decodal"') &&
+      source.includes("await toolchain.format(entry.content)"),
+    "all changed Decodal entries should be formatted rather than only the selected source",
+  );
+  assert(
+    source.includes("await formatDraftSources();") &&
+      source.includes("await requestCandidatePreview();") &&
+      source.includes("Committed formatted revision"),
+    "preview and commit should format first and refresh stale preflight before persistence",
+  );
+  assert(
+    !source.includes(
+      "Preview the complete candidate successfully before Commit.",
+    ),
+    "format-driven candidate changes should trigger automatic preflight instead of a dead-end error",
+  );
+});