update

package/node_modules/proggy/lib/tracker.js

@@ -0,0 +1,68 @@
+// The tracker class is intentionally as naive as possible.  it is just
+// an ergonomic wrapper around process.emit('progress', ...)
+const EE = require('events')
+class Tracker extends EE {
+  constructor (name, key, total) {
+    super()
+    if (!name) {
+      throw new Error('proggy: Tracker needs a name')
+    }
+
+    if (typeof key === 'number' && !total) {
+      total = key
+      key = null
+    }
+
+    if (!total) {
+      total = 100
+    }
+
+    if (!key) {
+      key = name
+    }
+
+    this.done = false
+    this.name = name
+    this.key = key
+    this.value = 0
+    this.total = total
+  }
+
+  finish (metadata = {}) {
+    this.update(this.total, this.total, metadata)
+  }
+
+  update (value, total, metadata) {
+    if (!metadata) {
+      if (total && typeof total === 'object') {
+        metadata = total
+      } else {
+        metadata = {}
+      }
+    }
+    if (typeof total !== 'number') {
+      total = this.total
+    }
+
+    if (this.done) {
+      const msg = `proggy: updating completed tracker: ${JSON.stringify(this.key)}`
+      throw new Error(msg)
+    }
+    this.value = value
+    this.total = total
+    const done = this.value >= this.total
+    process.emit('progress', this.key, {
+      ...metadata,
+      name: this.name,
+      key: this.key,
+      value,
+      total,
+      done,
+    })
+    if (done) {
+      this.done = true
+      this.emit('done')
+    }
+  }
+}
+module.exports = Tracker