show progress for imports and deletions

src/prefixes.js

@@ -4,6 +4,7 @@ const path = require('path')
 const fs = require('fs')
 const { DIRS, readJson, writeJson } = require('./paths')
 const { rewireSymlinks } = require('./symlinks')
+const { removeTree, treeSize } = require('./fsutil')
 const { normalizePathName } = require('./names')
 
 const REGISTRY = path.join(DIRS.DATA, 'prefixes.json')
@@ -71,15 +72,21 @@ function createPrefix(name) {
   return { ok: true, name: clean }
 }
 
-function deletePrefix(name) {
+// A prefix is a whole windows drive - removal is measured before it starts
+// (staging) so the UI can show a bar that actually moves while the tree is
+// walked file by file (removeTree), instead of one blocking rmSync.
+async function deletePrefix(name, onProgress) {
   if (String(name).toLowerCase() === MAIN.toLowerCase()) return { ok: false, error: 'isMain' }
   const defs = listPrefixes()
   defs.prefixes = defs.prefixes.filter(p => p.name !== name)
   if (defs.default === name) defs.default = MAIN
   savePrefixes(defs)
-  try {
-    fs.rmSync(prefixPath(name), { recursive: true, force: true })
-  } catch {}
+  const emit = (phase, detail) => {
+    if (onProgress) onProgress({ phase, label: name, ...detail })
+  }
+  emit('count', { files: 0, bytes: 0 })
+  const total = await treeSize(prefixPath(name))
+  await removeTree(prefixPath(name), p => emit('remove', { files: p.files, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
   return { ok: true }
 }