Fix mixed workspace selectors

crates/prek/src/cli/run/selector.rs

@@ -364,22 +364,36 @@ impl Selectors {
             return false;
         }
 
-        // If no project prefix selectors are present, all paths are included
-        if !self
-            .includes
-            .iter()
-            .any(|include| matches!(include.expr, SelectorExpr::ProjectPrefix(_)))
-        {
+        if self.includes.is_empty() {
             return true;
         }
 
         let mut included = false;
+        // This is a project-discovery prefilter, not final hook selection.
+        // Keep scanning after a match so project-prefix selectors still get
+        // usage recorded for accurate unused-selector warnings.
         for (idx, include) in self.includes.iter().enumerate() {
-            if let SelectorExpr::ProjectPrefix(project_path) = &include.expr {
-                if path.starts_with(project_path) {
-                    usage.use_include(idx);
+            match &include.expr {
+                SelectorExpr::HookId(_) => {
+                    // A bare hook id can match any project, but we cannot mark
+                    // it used until final hook filtering proves a hook exists.
                     included = true;
                 }
+                SelectorExpr::ProjectPrefix(project_path) => {
+                    // Project-prefix selectors select projects directly, so a
+                    // matching discovered project is enough to mark them used.
+                    if path.starts_with(project_path) {
+                        usage.use_include(idx);
+                        included = true;
+                    }
+                }
+                SelectorExpr::ProjectHook { project_path, .. } => {
+                    // `project:hook` only needs this exact project initialized;
+                    // usage is still decided by the final hook-id match.
+                    if path == project_path {
+                        included = true;
+                    }
+                }
             }
         }
         included

crates/prek/tests/workspace.rs

@@ -718,6 +718,86 @@ fn run_with_selectors() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn run_with_mixed_project_and_hook_selectors() -> Result<()> {
+    let context = TestContext::new();
+    context.init_project();
+
+    context.write_pre_commit_config(indoc! {r"
+    repos:
+      - repo: local
+        hooks:
+        - id: root-hook
+          name: root hook
+          entry: echo root
+          language: system
+          pass_filenames: false
+    "});
+
+    let sub = context.work_dir().child("sub");
+    sub.create_dir_all()?;
+    sub.child(".pre-commit-config.yaml").write_str(indoc! {r"
+    repos:
+      - repo: local
+        hooks:
+        - id: sub-hook
+          name: sub hook
+          entry: echo sub
+          language: system
+          pass_filenames: false
+    "})?;
+    sub.child("file.txt").write_str("")?;
+
+    let empty = context.work_dir().child("empty");
+    empty.create_dir_all()?;
+    empty
+        .child(".pre-commit-config.yaml")
+        .write_str("repos: []\n")?;
+
+    let unselected = context.work_dir().child("unselected");
+    unselected.create_dir_all()?;
+    unselected
+        .child(".pre-commit-config.yaml")
+        .write_str("invalid: config\n")?;
+
+    context.git_add(".");
+
+    cmd_snapshot!(context.filters(), context.run().arg("--all-files").arg("sub/").arg(".:root-hook"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    ✓ sub
+      sub hook...............................................................Passed
+    ✓ <workspace>
+      root hook..............................................................Passed
+
+    ----- stderr -----
+    ");
+
+    cmd_snapshot!(context.filters(), context.run().arg("--all-files").arg("sub/").arg("root-hook"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    ✓ sub
+      sub hook...............................................................Passed
+    ✓ <workspace>
+      root hook..............................................................Passed
+
+    ----- stderr -----
+    ");
+
+    cmd_snapshot!(context.filters(), context.run().arg("--all-files").arg("empty/").arg("root-hook"), @r"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    root hook................................................................Passed
+
+    ----- stderr -----
+    ");
+
+    Ok(())
+}
+
 #[test]
 fn skips() -> Result<()> {
     let context = TestContext::new();