Changed print & erase logic to used a fixed max width.

build.gradle

@@ -2,7 +2,7 @@ apply plugin: "groovy"
 apply plugin: "maven"
 
 group = "com.jdbernard"
-version = "1.1"
+version = "1.2"
 
 repositories {
     mavenLocal()

console_progress.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "1.1"
+version       = "1.2"
 author        = "Jonathan Bernard"
 description   = "Utility for writing dynamic progress bars to the console."
 license       = "BSD"

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

@@ -9,12 +9,12 @@ package com.jdbernard.util
  * @author Jonathan Bernard (jdbernard@gmail.com)
  */
 public class ConsoleProgressBar {
-  int MAX_STEP = 30
+  int WIDTH = 79
+  int MAX_STEP = 35
 
   long max = 10
   def out = System.out
   private int lastStepAmount = -1
-  private String lastLinePrinted = ""
   private String lastInfo = ""
   private long startTime
 
@@ -50,20 +50,17 @@ public class ConsoleProgressBar {
       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} -- (" +
+      out.print '\b' * WIDTH
+      def line = = '=' * numEq + (curStep > 0 ? "0" : "") + '-' * (MAX_STEP - curStep)
+      line += " ${info} -- (" +
         "${String.format('%5.2f', curPercent * 100)}%, ${remMin ? remMin + 'm ' : ''}${remSec}s)       "
-      out.print lastLinePrinted
+      out.print line.padRight(WIDTH)
       lastStepAmount = curStep;
     }
     out.flush()
   }
 
   public void erase() {
-      out.print '\b' * lastLinePrinted.length()
-      out.print ' ' * lastLinePrinted.length()
-      out.print '\b' * lastLinePrinted.length()
-      lastLinePrinted = ""
+      out.print ('\b' * WIDTH) + (' ' * WIDTH) + ('\b' * WIDTH)
   }
 }

src/main/nim/console_progress.nim

@@ -2,9 +2,9 @@ import strutils, times, math
 
 type Progress* = ref object of RootObj
   sout: File
-  lastStep, maxSteps: int
+  lastStep, width, maxSteps: int
   startTime: float
-  lastLinePrinted, lastInfo: string
+  lastInfo: string
   maxValue: BiggestInt
 
 proc getMax*(pd: Progress): BiggestInt =
@@ -17,9 +17,9 @@ proc newProgress*(sout: File, maxValue: BiggestInt): Progress =
   return Progress(sout: sout,
     startTime: cpuTime(),
     lastStep: 0,
-    lastLinePrinted: "",
     maxValue: maxValue,
-    maxSteps: 30)
+    width: 79,
+    maxSteps: 35)
 
 proc updateProgress*(pd: Progress, newValue: BiggestInt, info: string): void =
 
@@ -40,29 +40,29 @@ proc updateProgress*(pd: Progress, newValue: BiggestInt, info: string): void =
   if displayedInfo.len < 16:
     displayedInfo = displayedInfo & ' '.repeat(16 - displayedInfo.len)
 
-  pd.sout.write('\b'.repeat(pd.lastLinePrinted.len))
+  pd.sout.write('\b'.repeat(pd.width))
 
-  pd.lastLinePrinted =
+  var line =
     '='.repeat(displayedSteps) & (if curStep > 0: "0" else: "") &
     '-'.repeat(pd.maxSteps - curStep) & " " &
     displayedInfo & " -- (" &
     (curPercent * 100).formatFloat(ffDecimal, 2) & "%" 
 
   if curPercent > 0.05:
-    pd.lastLinePrinted &= ", "
+    line &= ", "
     if remTime > 60:
-      pd.lastLinePrinted &= $floor(remTime / 60).int & "m "
-    pd.lastLinePrinted &= $ceil(remTime mod 60) & "s"
+      line &= $floor(remTime / 60).int & "m "
+    line &= $ceil(remTime mod 60) & "s"
 
-  pd.lastLinePrinted &= ")"
+  line &= ")"
+  line &= spaces(max(pd.width - line.len, 0))
 
-  pd.sout.write(pd.lastLinePrinted)
+  pd.sout.write(line)
   pd.lastStep = curStep
 
   pd.sout.flushFile
 
 proc erase*(pd: Progress): void =
-  pd.sout.write('\b'.repeat(pd.lastLinePrinted.len))
-  pd.sout.write(' '.repeat(pd.lastLinePrinted.len))
-  pd.sout.write('\b'.repeat(pd.lastLinePrinted.len))
-  pd.lastLinePrinted = ""
+  pd.sout.write('\b'.repeat(pd.width))
+  pd.sout.write(' '.repeat(pd.width))
+  pd.sout.write('\b'.repeat(pd.width))