Nim implementation.

.gitignore

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+build/
+nimcache/
+.gradle/
+*.sw?

console_progress.nimble

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+# Package
+
+version       = "1.0"
+author        = "Jonathan Bernard"
+description   = "Utility for writing dynamic progress bars to the console."
+license       = "BSD"
+srcDir        = "src/main/nim"
+
+# Dependencies
+
+requires "nim >= 0.13.0"
+

src/main/nim/console_progress.nim

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+import strutils, times, math
+
+type Progress* = ref object of RootObj
+  sout: File
+  lastStep, maxSteps: int
+  startTime: float
+  lastLinePrinted, lastInfo: string
+  maxValue: BiggestInt
+
+proc getMax*(pd: Progress): BiggestInt =
+  return pd.maxValue
+
+proc setMax*(pd: Progress, maxValue: BiggestInt) =
+  pd.maxValue = max(maxValue, 1)
+
+proc newProgress*(sout: File, maxValue: BiggestInt): Progress =
+  return Progress(sout: sout,
+    startTime: cpuTime(),
+    lastStep: 0,
+    lastLinePrinted: "",
+    maxValue: maxValue,
+    maxSteps: 30)
+
+proc updateProgress*(pd: Progress, newValue: BiggestInt, info: string): void =
+
+  # Calculate progress
+  let value = min(newValue, pd.maxValue)
+  let curStep = floor((value.BiggestFloat / pd.maxValue.BiggestFloat) * pd.maxSteps.float).int
+  let curPercent = value.BiggestFloat / pd.maxValue.BiggestFloat
+
+  if info == pd.lastInfo and curStep == pd.lastStep: return
+
+  let curTime = cpuTime()
+  let remTime = ((curTime / curPercent) - curTime) * 1000
+  let displayedSteps = max(curStep - 1, 0)
+
+  pd.lastInfo = info
+  var displayedInfo = info
+  if displayedInfo.len > 16: displayedInfo = info[0..15]
+  if displayedInfo.len < 16:
+    displayedInfo = displayedInfo & ' '.repeat(16 - displayedInfo.len)
+
+  pd.sout.write('\b'.repeat(pd.lastLinePrinted.len))
+
+  pd.lastLinePrinted =
+    '='.repeat(displayedSteps) & (if curStep > 0: "0" else: "") &
+    '-'.repeat(pd.maxSteps - curStep) & " " &
+    displayedInfo & " -- (" &
+    (curPercent * 100).formatFloat(ffDecimal, 2) & "%" 
+
+  if curPercent > 0.05:
+    pd.lastLinePrinted &= ", "
+    if remTime > 60:
+      pd.lastLinePrinted &= $floor(remTime / 60).int & "m "
+    pd.lastLinePrinted &= $ceil(remTime mod 60) & "s"
+
+  pd.lastLinePrinted &= ")"
+
+  pd.sout.write(pd.lastLinePrinted)
+  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 = ""