feat(links): wire up nuwiki.links.generateForPath (scoped GenerateLinks)

`:VimwikiGenerateLinks <path>` sent nuwiki.links.generateForPath, but the
server had no handler and didn't advertise it — so the scoped form was
silently dropped (only the no-arg form worked). Register and implement it.

The page list is scoped via page_in_scope: a plain `path` is a directory
subtree (the page itself or anything under `<path>/`); a `path` with `*`/`?`
is a glob pattern (upstream's behaviour), matched with export::glob_match
(now pub(crate)). links_generate and the scoped form share
links_generate_scoped, so cursor-line insertion + captions + config all
apply uniformly.

Tests: page_in_scope unit tests (subtree, glob, prefix-sibling, trailing
slash) + COMMANDS advertises both generate forms. 580 passed, clippy
clean, harnesses green. Doc updated with the [path] argument.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/nuwiki-lsp/src/commands.rs

@@ -41,6 +41,7 @@ pub const COMMANDS: &[&str] = &[
     "nuwiki.heading.removeLevel",
     "nuwiki.toc.generate",
     "nuwiki.links.generate",
+    "nuwiki.links.generateForPath",
     "nuwiki.workspace.checkLinks",
     "nuwiki.workspace.findOrphans",
     "nuwiki.diary.openToday",
@@ -117,6 +118,9 @@ pub(crate) async fn execute(
         "nuwiki.links.generate" => {
             links_generate(backend, args).map(|o| o.map(CommandOutcome::Edit))
         }
+        "nuwiki.links.generateForPath" => {
+            links_generate_for_path(backend, args).map(|o| o.map(CommandOutcome::Edit))
+        }
         "nuwiki.workspace.checkLinks" => {
             workspace_check_links(backend, args).map(|o| o.map(CommandOutcome::Value))
         }
@@ -372,16 +376,61 @@ fn toc_generate(backend: &Backend, args: Vec<Value>) -> Result<Option<WorkspaceE
 
 fn links_generate(backend: &Backend, args: Vec<Value>) -> Result<Option<WorkspaceEdit>, String> {
     let (uri, cursor_line) = parse_uri_line_arg(args)?;
-    let doc = match backend.documents.get(&uri) {
+    links_generate_scoped(backend, &uri, cursor_line, None)
+}
+
+/// `:VimwikiGenerateLinks <path>` — scope the generated links to a subtree.
+fn links_generate_for_path(
+    backend: &Backend,
+    args: Vec<Value>,
+) -> Result<Option<WorkspaceEdit>, String> {
+    #[derive(Deserialize)]
+    struct Args {
+        uri: Url,
+        path: String,
+        #[serde(default)]
+        line: Option<u32>,
+    }
+    let raw = args.into_iter().next().ok_or_else(|| {
+        "nuwiki.links.generateForPath: missing { uri, path } argument".to_string()
+    })?;
+    let parsed: Args = serde_json::from_value(raw)
+        .map_err(|e| format!("nuwiki.links.generateForPath: invalid args — {e}"))?;
+    links_generate_scoped(backend, &parsed.uri, parsed.line, Some(&parsed.path))
+}
+
+/// True when page `name` falls within `scope`. A scope containing `*`/`?` is a
+/// glob (upstream's pattern arg); otherwise it's a directory subtree — the page
+/// itself or anything under `<scope>/`. Page names are wiki-root-relative with
+/// `/` separators (e.g. `projects/api`).
+fn page_in_scope(name: &str, scope: &str) -> bool {
+    let scope = scope.trim_matches('/');
+    if scope.is_empty() {
+        return true;
+    }
+    if scope.contains('*') || scope.contains('?') {
+        crate::export::glob_match(scope, name)
+    } else {
+        name == scope || name.starts_with(&format!("{scope}/"))
+    }
+}
+
+fn links_generate_scoped(
+    backend: &Backend,
+    uri: &Url,
+    cursor_line: Option<u32>,
+    scope: Option<&str>,
+) -> Result<Option<WorkspaceEdit>, String> {
+    let doc = match backend.documents.get(uri) {
         Some(d) => d,
         None => return Ok(None),
     };
     let utf8 = backend.use_utf8.load(Ordering::Relaxed);
-    let wiki = match backend.wiki_for_uri(&uri) {
+    let wiki = match backend.wiki_for_uri(uri) {
         Some(w) => w,
         None => return Ok(None),
     };
-    let current_page = crate::index::page_name_from_uri(&uri, Some(&wiki.config.root));
+    let current_page = crate::index::page_name_from_uri(uri, Some(&wiki.config.root));
     let (pages, captions) = {
         let idx = wiki
             .index
@@ -391,12 +440,20 @@ fn links_generate(backend: &Backend, args: Vec<Value>) -> Result<Option<Workspac
             .config
             .generated_links_caption
             .then(|| ops::page_captions(&idx));
-        (idx.page_names(), captions)
+        let names: Vec<String> = match scope {
+            Some(s) => idx
+                .page_names()
+                .into_iter()
+                .filter(|n| page_in_scope(n, s))
+                .collect(),
+            None => idx.page_names(),
+        };
+        (names, captions)
     };
     Ok(ops::links_edit(
         &doc.text,
         &doc.ast,
-        &uri,
+        uri,
         &current_page,
         &pages,
         utf8,
@@ -3941,3 +3998,33 @@ pub mod export_ops {
         out
     }
 }
+
+#[cfg(test)]
+mod scope_tests {
+    use super::page_in_scope;
+
+    #[test]
+    fn empty_scope_matches_everything() {
+        assert!(page_in_scope("anything", ""));
+        assert!(page_in_scope("a/b/c", "/"));
+    }
+
+    #[test]
+    fn subtree_matches_self_and_descendants() {
+        assert!(page_in_scope("projects", "projects"));
+        assert!(page_in_scope("projects/api", "projects"));
+        assert!(page_in_scope("projects/api/v2", "projects"));
+        // Not a sibling that merely shares a prefix.
+        assert!(!page_in_scope("projectsX", "projects"));
+        assert!(!page_in_scope("Home", "projects"));
+        // Trailing slash on the scope is tolerated.
+        assert!(page_in_scope("projects/api", "projects/"));
+    }
+
+    #[test]
+    fn glob_scope_uses_pattern_match() {
+        assert!(page_in_scope("diary/2026-05-30", "diary/*"));
+        assert!(page_in_scope("notes-2026", "notes-*"));
+        assert!(!page_in_scope("Home", "diary/*"));
+    }
+}

crates/nuwiki-lsp/src/export.rs

@@ -329,7 +329,7 @@ fn escape_html(s: &str) -> String {
 /// Minimal glob match for `exclude_files`. Handles `*`, `**`, `?` and
 /// literal characters. No character classes — those aren't needed for
 /// "exclude foo/*.tmp" style patterns.
-fn glob_match(pattern: &str, text: &str) -> bool {
+pub(crate) fn glob_match(pattern: &str, text: &str) -> bool {
     glob_impl(pattern.as_bytes(), text.as_bytes())
 }
 

crates/nuwiki-lsp/tests/commands_links.rs

@@ -32,6 +32,10 @@ fn commands_list_advertises_link_helpers() {
         "nuwiki.link.pasteWikilink",
         "nuwiki.link.pasteUrl",
         "nuwiki.link.catUrl",
+        // Both GenerateLinks forms must be advertised so coc/vim-lsp accept
+        // them (the scoped form was previously sent but unregistered).
+        "nuwiki.links.generate",
+        "nuwiki.links.generateForPath",
     ] {
         assert!(names.contains(&name), "missing: {name}");
     }