mdw@git.distorted.org.uk Git - tripe-android/blob - progress.scala

   1 /* -*-scala-*-
   2  *
   3  * Reporting progress for long-running jobs
   4  *
   5  * (c) 2018 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Trivial IP Encryption (TrIPE) Android app.
  11  *
  12  * TrIPE is free software: you can redistribute it and/or modify it under
  13  * the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * TrIPE is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with TrIPE.  If not, see <https://www.gnu.org/licenses/>.
  24  */
  25
  26 package uk.org.distorted.tripe; package object progress;
  27
  28 /*----- Imports -----------------------------------------------------------*/
  29
  30 import Math.ceil;
  31 import System.currentTimeMillis;
  32 import System.{err => stderr};          // FIXME: split out terminal progress
  33
  34 /*----- Main code ---------------------------------------------------------*/
  35
  36 def formatTime(t: Int): String =
  37   if (t < -1) "???"
  38   else {
  39     val (s, t1) = (t%60, t/60);
  40     val (m, h) = (t1%60, t1/60);
  41     if (h > 0) f"$h%d:$m%02d:$s%02d"
  42     else f"$m%02d:$s%02d"
  43   }
  44
  45 private val UDATA = Seq("kB", "MB", "GB", "PB", "EB");
  46 def formatBytes(n: Long): String = {
  47   val (x, u) = (n.toDouble, "B ") /: UDATA {
  48     case ((x, u), name) if x >= 1024.0 => (x/1024.0, name)
  49     case (xu, _) => xu
  50   }
  51   f"$x%6.1f$u%s"
  52 }
  53
  54 trait Eyecandy {
  55   def set(line: String);
  56   def clear();
  57   def commit();
  58   def commit(line: String) { commit(); set(line); commit(); }
  59
  60   def begin(job: Job);
  61 }
  62
  63
  64 trait Job with Publisher[ {
  65   def what: String;                     // imperative for what we're doing
  66   def cur: Long;                        // current position in work
  67   def max: Long;                        // maximum work to do
  68   def format: String;                   // describe progress in useful terms
  69
  70   private[this] val t0 = currentTimeMillis;
  71
  72   def eta: Int =
  73     /* Report the estimated time remaining in seconds, or -1 if no idea.
  74      *
  75      * The model here is very stupid.  Weird jobs should override this and do
  76      * something more sensible.
  77      */
  78
  79     if (max < 0 || cur <= 0) -1
  80     else ceil((currentTimeMillis - t0)/1000.0 *
  81               (max - cur)/cur.toDouble).toInt;
  82 }
  83
  84 object TerminalEyecandy extends Eyecandy {
  85   private var last = "";
  86   var eyecandyp =
  87
  88 }
  89
  90 /*----- That's all, folks -------------------------------------------------*/