feat(config): on-save autoregen family — links/tags/diary-index (P2)

Added per-wiki auto_generate_links, auto_generate_tags, auto_diary_index
(default false, like upstream), wired into the did_save hook mirroring
auto_toc:

- auto_generate_links / auto_generate_tags rebuild the Generated Links /
  Generated Tags section ONLY when it already exists (new
  links_rebuild_edit / tag_links_rebuild_edit, like toc_rebuild_edit) — never
  inserts one into a page that lacks it.
- auto_diary_index regenerates the diary index page when a dated diary entry
  (not the index itself) is saved, via diary_generate_index_edit (handles the
  index file open / on-disk / absent).

auto_tags is recorded as an intentional divergence: nuwiki re-indexes tags on
every change, so the tag metadata is always fresh (no on-disk file to update).

Tests: links_rebuild_edit_only_acts_when_section_present,
tag_links_rebuild_edit_only_acts_when_index_present, config round-trip +
defaults. README/doc/lua comment updated. fmt/clippy clean; 0 Rust failures.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/nuwiki-lsp/src/commands.rs

@@ -2041,6 +2041,33 @@ pub mod ops {
         Some(b.build())
     }
 
+    /// Like [`links_edit`], but only when a `Generated Links` section already
+    /// exists — the `auto_generate_links`-on-save hook, mirroring
+    /// [`toc_rebuild_edit`]. Never inserts one into a page that lacks it.
+    #[allow(clippy::too_many_arguments)]
+    pub fn links_rebuild_edit(
+        text: &str,
+        ast: &DocumentNode,
+        uri: &Url,
+        current_page: &str,
+        all_pages: &[String],
+        utf8: bool,
+        heading: &str,
+        level: u8,
+    ) -> Option<WorkspaceEdit> {
+        find_section_range(ast, heading)?;
+        links_edit(
+            text,
+            ast,
+            uri,
+            current_page,
+            all_pages,
+            utf8,
+            heading,
+            level,
+        )
+    }
+
     // ===== Workspace queries =====
 
     #[derive(Debug, Serialize)]
@@ -3220,6 +3247,22 @@ pub mod ops {
         Some(b.build())
     }
 
+    /// Like [`tag_links_edit`] for the no-arg index, but only when a
+    /// `Generated Tags` section already exists — the `auto_generate_tags`
+    /// on-save hook. Never inserts one into a page that lacks it.
+    pub fn tag_links_rebuild_edit(
+        text: &str,
+        ast: &DocumentNode,
+        uri: &Url,
+        pages_by_tag: &std::collections::BTreeMap<String, Vec<String>>,
+        utf8: bool,
+        header: &str,
+        level: u8,
+    ) -> Option<WorkspaceEdit> {
+        find_section_range(ast, header)?;
+        tag_links_edit(text, ast, uri, None, pages_by_tag, utf8, header, level)
+    }
+
     // Keep the import live for downstream use even when the local module
     // doesn't reference it directly.
     #[allow(dead_code)]

crates/nuwiki-lsp/src/config.rs

@@ -75,6 +75,15 @@ pub struct WikiConfig {
     pub links_space_char: String,
     /// Rebuild the page's TOC on save when set.
     pub auto_toc: bool,
+    /// On save, regenerate an existing `Generated Links` section
+    /// (vimwiki's `auto_generate_links`).
+    pub auto_generate_links: bool,
+    /// On save, regenerate an existing `Generated Tags` index section
+    /// (vimwiki's `auto_generate_tags`).
+    pub auto_generate_tags: bool,
+    /// On save of a diary entry, regenerate the diary index page
+    /// (vimwiki's `auto_diary_index`).
+    pub auto_diary_index: bool,
     /// Heading text + level for the generated `:VimwikiTOC` section
     /// (vimwiki's `toc_header` / `toc_header_level`).
     pub toc_header: String,
@@ -208,6 +217,9 @@ impl WikiConfig {
             list_margin: d.list_margin,
             links_space_char: d.links_space_char,
             auto_toc: d.auto_toc,
+            auto_generate_links: d.auto_generate_links,
+            auto_generate_tags: d.auto_generate_tags,
+            auto_diary_index: d.auto_diary_index,
             toc_header: d.toc_header,
             toc_header_level: d.toc_header_level,
             links_header: d.links_header,
@@ -244,6 +256,9 @@ impl WikiConfig {
             list_margin: d.list_margin,
             links_space_char: d.links_space_char,
             auto_toc: d.auto_toc,
+            auto_generate_links: d.auto_generate_links,
+            auto_generate_tags: d.auto_generate_tags,
+            auto_diary_index: d.auto_diary_index,
             toc_header: d.toc_header,
             toc_header_level: d.toc_header_level,
             links_header: d.links_header,
@@ -384,6 +399,9 @@ fn wiki_defaults() -> WikiDefaults {
         list_margin: -1,
         links_space_char: default_links_space_char(),
         auto_toc: false,
+        auto_generate_links: false,
+        auto_generate_tags: false,
+        auto_diary_index: false,
         toc_header: default_toc_header(),
         toc_header_level: 1,
         links_header: default_links_header(),
@@ -409,6 +427,9 @@ struct WikiDefaults {
     list_margin: i32,
     links_space_char: String,
     auto_toc: bool,
+    auto_generate_links: bool,
+    auto_generate_tags: bool,
+    auto_diary_index: bool,
     toc_header: String,
     toc_header_level: u8,
     links_header: String,
@@ -641,6 +662,12 @@ struct RawWiki {
     links_space_char: Option<String>,
     #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
     auto_toc: Option<bool>,
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
+    auto_generate_links: Option<bool>,
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
+    auto_generate_tags: Option<bool>,
+    #[serde(default, deserialize_with = "opt_bool_or_int::deserialize")]
+    auto_diary_index: Option<bool>,
     #[serde(default)]
     toc_header: Option<String>,
     #[serde(default)]
@@ -714,6 +741,9 @@ impl From<RawWiki> for WikiConfig {
             list_margin: r.list_margin.unwrap_or(d.list_margin),
             links_space_char: r.links_space_char.unwrap_or(d.links_space_char),
             auto_toc: r.auto_toc.unwrap_or(d.auto_toc),
+            auto_generate_links: r.auto_generate_links.unwrap_or(d.auto_generate_links),
+            auto_generate_tags: r.auto_generate_tags.unwrap_or(d.auto_generate_tags),
+            auto_diary_index: r.auto_diary_index.unwrap_or(d.auto_diary_index),
             toc_header: r.toc_header.unwrap_or(d.toc_header),
             toc_header_level: r.toc_header_level.unwrap_or(d.toc_header_level),
             links_header: r.links_header.unwrap_or(d.links_header),

crates/nuwiki-lsp/src/lib.rs

@@ -635,6 +635,84 @@ impl LanguageServer for Backend {
             }
         }
 
+        let utf8 = self.use_utf8.load(Ordering::Relaxed);
+
+        // `auto_generate_links`: rebuild an existing `Generated Links` section.
+        if wiki.config.auto_generate_links {
+            let edit = self.documents.get(&uri).and_then(|doc| {
+                let current = index::page_name_from_uri(&uri, Some(&wiki.config.root));
+                let pages = wiki
+                    .index
+                    .read()
+                    .ok()
+                    .map(|i| i.page_names())
+                    .unwrap_or_default();
+                commands::ops::links_rebuild_edit(
+                    &doc.text,
+                    &doc.ast,
+                    &uri,
+                    &current,
+                    &pages,
+                    utf8,
+                    &wiki.config.links_header,
+                    wiki.config.links_header_level,
+                )
+            });
+            if let Some(edit) = edit {
+                let _ = self.client.apply_edit(edit).await;
+            }
+        }
+
+        // `auto_generate_tags`: rebuild an existing `Generated Tags` index.
+        if wiki.config.auto_generate_tags {
+            let edit = self.documents.get(&uri).and_then(|doc| {
+                let snap = wiki
+                    .index
+                    .read()
+                    .ok()
+                    .map(|i| commands::ops::tag_pages_snapshot(&i))
+                    .unwrap_or_default();
+                commands::ops::tag_links_rebuild_edit(
+                    &doc.text,
+                    &doc.ast,
+                    &uri,
+                    &snap,
+                    utf8,
+                    &wiki.config.tags_header,
+                    wiki.config.tags_header_level,
+                )
+            });
+            if let Some(edit) = edit {
+                let _ = self.client.apply_edit(edit).await;
+            }
+        }
+
+        // `auto_diary_index`: when a diary *entry* (a dated page, not the
+        // index itself) is saved, regenerate the diary index page.
+        if wiki.config.auto_diary_index {
+            if let Some(index_uri) = crate::diary::index_uri(&wiki.config) {
+                let is_diary_entry = uri != index_uri
+                    && wiki
+                        .index
+                        .read()
+                        .ok()
+                        .and_then(|i| i.page(&uri).and_then(|p| p.diary_period))
+                        .is_some();
+                if is_diary_entry {
+                    let body = wiki
+                        .index
+                        .read()
+                        .ok()
+                        .map(|i| crate::diary::render_index_body(&wiki.config, &i));
+                    if let Some(body) = body {
+                        let edit =
+                            commands::ops::diary_generate_index_edit(self, &index_uri, &body, utf8);
+                        let _ = self.client.apply_edit(edit).await;
+                    }
+                }
+            }
+        }
+
         // When `auto_export` is set on the resolved wiki, run
         // the equivalent of `nuwiki.export.currentToHtml` after the file
         // hits disk. Best-effort — failures are logged but do not bubble