From 270d67cff2bfd62ac11e423712995d9c5cd3d502 Mon Sep 17 00:00:00 2001
From: SkepticMystic <rossk29@gmail.com>
Date: Fri, 3 May 2024 12:07:16 +0200
Subject: [PATCH] perf(command:freeze-crumbs): Only processFrontmatter if it
 was actually mutated

---
 src/commands/init.ts                      |  4 ++
 src/components/side_views/TreeView.svelte |  2 +-
 src/utils/drop_crumb.ts                   | 74 +++++++++++++++--------
 3 files changed, 53 insertions(+), 27 deletions(-)

diff --git a/src/commands/init.ts b/src/commands/init.ts
index a05d63c5..e9ff64bd 100644
--- a/src/commands/init.ts
+++ b/src/commands/init.ts
@@ -121,6 +121,10 @@ export const init_all_commands = (plugin: BreadcrumbsPlugin) => {
 								),
 						);
 
+						log.debug(
+							`freeze-implied-edges-to-vault > took ${timer.elapsed_str()}ms`,
+						);
+
 						notice.setMessage(
 							`Implied edges frozen to all notes in ${timer.elapsed_str()}ms`,
 						);
diff --git a/src/components/side_views/TreeView.svelte b/src/components/side_views/TreeView.svelte
index f6159e4d..2b1e6f09 100644
--- a/src/components/side_views/TreeView.svelte
+++ b/src/components/side_views/TreeView.svelte
@@ -53,7 +53,7 @@
 			: [];
 </script>
 
-<div class="markdown-rendered BC-tree-view -mt-2">
+<div class="markdown-rendered BC-tree-view">
 	<div class="nav-header">
 		<div class="nav-buttons-container">
 			<RebuildGraphButton
diff --git a/src/utils/drop_crumb.ts b/src/utils/drop_crumb.ts
index dfc2b3bb..e19ad64a 100644
--- a/src/utils/drop_crumb.ts
+++ b/src/utils/drop_crumb.ts
@@ -62,38 +62,60 @@ export const drop_crumbs = async (
 
 	switch (options.destination) {
 		case "frontmatter": {
-			await plugin.app.fileManager.processFrontMatter(
-				destination_file,
-				(frontmatter) => {
-					Object.keys(links_by_field).forEach((field) => {
-						const links = links_by_field[field]!;
-
-						const existing = frontmatter[field];
-						if (existing) {
-							frontmatter[field] = remove_duplicates(
-								ensure_is_array(existing).concat(links),
-							);
-						} else {
-							frontmatter[field] = links;
-						}
-					});
-
-					log.debug(
-						"drop_crumbs > processed frontmatter",
-						frontmatter,
+			let mutated = false;
+
+			const frontmatter =
+				plugin.app.metadataCache.getFileCache(destination_file)
+					?.frontmatter ?? {};
+
+			Object.entries(links_by_field).forEach(([field, links]) => {
+				if (!links?.length) return;
+
+				const existing = frontmatter[field];
+				if (existing) {
+					const existing_array = ensure_is_array(existing);
+					const new_links = remove_duplicates(
+						existing_array.concat(links),
 					);
-				},
-			);
+
+					if (new_links.length !== existing_array.length) {
+						mutated = true;
+						frontmatter[field] = new_links;
+					}
+				} else {
+					mutated = true;
+					frontmatter[field] = links;
+				}
+			});
+
+			if (mutated) {
+				await plugin.app.fileManager.processFrontMatter(
+					destination_file,
+					(old_frontmatter) => {
+						const new_frontmatter = Object.assign(
+							old_frontmatter,
+							frontmatter,
+						);
+
+						log.debug(
+							"drop_crumbs > processed frontmatter",
+							new_frontmatter,
+						);
+					},
+				);
+			}
 
 			break;
 		}
 
 		case "dataview-inline": {
-			const dataview_fields = Object.keys(links_by_field).map((field) => {
-				const links = links_by_field[field]!;
-
-				return `${field}:: ${links.join(", ")}`;
-			});
+			// TODO: Dedupe links using dv page API
+			const dataview_fields = Object.entries(links_by_field)
+				.map(([field, links]) => {
+					if (!links?.length) return "";
+					else return `${field}:: ${links.join(", ")}`;
+				})
+				.filter(Boolean);
 
 			// NOTE: Just appends for now
 			await plugin.app.vault.process(destination_file, (content) => {