Initial commit: com.jdbernard.util.ConsoleProgress

build.gradle

@@ -0,0 +1,14 @@
+apply plugin: "groovy"
+apply plugin: "maven"
+
+group = "com.jdbernard"
+version = "1.0"
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    compile localGroovy()
+}

src/main/groovy/com/jdbernard/util/ConsoleProgressBar.groovy

@@ -0,0 +1,69 @@
+package com.jdbernard.util
+
+/**
+ * Controls a console-based progress bar.
+ * This bar has two totals, an overall process total and an individual file
+ * total. The overall total is 0-based because the current value is incomplete
+ * (the file counter is the partial completion of the current step). The file
+ * counter is 1-based because the current step is complete for this counter.
+ * @author Jonathan Bernard (jdbernard@gmail.com)
+ */
+class ConsoleProgressBar {
+  int MAX_STEP = 30
+
+  long max = 10
+  def out = System.out
+  private int lastStepAmount = -1
+  private String lastLinePrinted = ""
+  private String lastInfo = ""
+  private long startTime
+
+  public void setMax(long max) {
+    this.max = Math.max(max, 1) }
+
+  void update(long value, String info) {
+    if (value == 0 || startTime == 0)
+        startTime = System.currentTimeMillis()
+
+    def curStep
+    def curPercent
+    def curTime
+    def remTime
+
+    value = Math.min(value, max)
+
+    curStep = Math.floor((value/max) * MAX_STEP)
+    curPercent  = ((double) value / (double) max)
+
+    if (info != lastInfo || curStep != lastStepAmount) {
+      // time so far
+      curTime = System.currentTimeMillis() - startTime
+      // estimate total time based on how far we are
+      remTime = (curTime / curPercent) - curTime
+      remTime /= 1000
+
+      def numEq = Math.max(curStep - 1, 0)
+      def remMin = curPercent < 0.05 ? '?' : (long) (remTime / 60)
+      def remSec = curPercent < 0.05 ? '?' : (long) (((remTime / 60.0) - remMin) * 60)
+
+      lastInfo = info
+      if (info.length() > 16) info = info[0..<16]
+      if (info.length() < 16) info = info.padRight(16)
+
+      out.print '\b' * lastLinePrinted.length()
+      lastLinePrinted = '=' * numEq + (curStep > 0 ? "0" : "") + '-' * (MAX_STEP - curStep)
+      lastLinePrinted += " ${info} -- (" +
+        "${String.format('%5.2f', curPercent * 100)}%, ${remMin ? remMin + 'm ' : ''}${remSec}s)       "
+      out.print lastLinePrinted
+      lastStepAmount = curStep;
+    }
+    out.flush()
+  }
+
+  void erase() {
+      out.print '\b' * lastLinePrinted.length()
+      out.print ' ' * lastLinePrinted.length()
+      out.print '\b' * lastLinePrinted.length()
+      lastLinePrinted = ""
+  }
+}