clean up watching

framework/lib/view.ts

@@ -56,6 +56,11 @@ export async function renderView(
   }));
 }
 
+export function provideViews(v: typeof views, s: typeof scripts) {
+  views = v;
+  scripts = s;
+}
+
 export function joinScripts(scriptSources: string[]) {
   const { length } = scriptSources;
   if (length === 0) return "";

framework/watch.ts

@@ -3,11 +3,11 @@
 const debounceMilliseconds = 25;
 
 export async function main() {
-  // Catch up state
+  // Catch up state by running a main build.
   const { incr } = await generate.main();
-
-  // Initialize a watch
+  // ...and watch the files that cause invals.
   const watch = new Watch(rebuild);
+  watch.add(...incr.invals.keys());
   statusLine();
 
   function rebuild(files: string[]) {
@@ -21,7 +21,7 @@ export async function main() {
       return;
     }
     withSpinner<Record<string, unknown>, any>({
-      text: "Recovering State",
+      text: "Rebuilding",
       successText: generate.successText,
       failureText: () => "sitegen FAIL",
     }, async (spinner) => {
@@ -34,6 +34,10 @@ export async function main() {
       );
       const result = await generate.sitegen(spinner, incr);
       incr.toDisk(); // Allows picking up this state again
+      for (const file of watch.files) {
+        const relative = path.relative(hot.projectRoot, file);
+        if (!incr.invals.has(file)) watch.remove(file);
+      }
       return result;
     }).catch((err) => {
       console.error(util.inspect(err));
@@ -41,7 +45,6 @@ export async function main() {
   }
 
   function statusLine() {
-    watch.add(...incr.invals.keys());
     console.info(
       `Watching ${incr.invals.size} files \x1b[36m[last change: ${
         new Date().toLocaleTimeString()
@@ -104,6 +107,22 @@ class Watch {
     }
   }
 
+  remove(...files: string[]) {
+    for (const file of files) this.files.delete(path.resolve(file));
+    // Find watches that are covering no files
+    const { roots, watchers } = this;
+    const existingFiles = Array.from(this.files);
+    let i = roots.length;
+    while (i > 0) {
+      i -= 1;
+      const root = roots[i];
+      if (!existingFiles.some((file) => file.startsWith(root))) {
+        watchers.splice(i, 1)[0].close();
+        roots.splice(i, 1);
+      }
+    }
+  }
+
   stop() {
     for (const w of this.watchers) w.close();
   }