From b7f078971bead09aeac7066faf77abb2be9e927b Mon Sep 17 00:00:00 2001
From: Martin	Diehl <m.diehl@mpie.de>
Date: Wed, 15 Oct 2014 08:32:53 +0000
Subject: [PATCH] added background threading (might be used in more than one
 script)

---
 lib/damask/util.py | 78 ++++++++++++++++++++++++++++++++++------------
 1 file changed, 58 insertions(+), 20 deletions(-)

diff --git a/lib/damask/util.py b/lib/damask/util.py
index 9709b8eea..c045673ea 100644
--- a/lib/damask/util.py
+++ b/lib/damask/util.py
@@ -1,22 +1,33 @@
 # -*- coding: UTF-8 no BOM -*-
 
 # damask utility functions
-import math
+import threading
+import numpy as np
 from optparse import OptionParser, Option
 
-try:
-  import numpy
-except:
-  numpy=None
-
+# -----------------------------
 # Matlab like trigonometric functions that take and return angles in degrees.
+# -----------------------------
 for f in ['cos', 'sin', 'tan']:
-    if numpy:
-      exec('def %sd(deg): return (numpy.%s(numpy.deg2rad(deg)))'%(f,f))
-      exec('def a%sd(val): return (numpy.rad2deg(numpy.arc%s(val)))'%(f,f))
-    else:  
-      exec('def %sd(deg): return (math.%s(deg/180.*math.pi))'%(f,f))
-      exec('def a%sd(val): return (math.a%s(val)*180./math.pi)'%(f,f))
+  exec('def %sd(deg): return (np.%s(np.deg2rad(deg)))'%(f,f))
+  exec('def a%sd(val): return (np.rad2deg(np.arc%s(val)))'%(f,f))
+
+
+# -----------------------------
+def gridLocation(idx,res):
+# -----------------------------
+  return ( idx  % res[0], \
+         ( idx // res[0]) % res[1], \
+         ( idx // res[0] // res[1]) % res[2] )
+
+
+# -----------------------------
+def gridIndex(location,res):
+# -----------------------------
+  return ( location[0] % res[0]                   + \
+         ( location[1] % res[1]) * res[0]          + \
+         ( location[2] % res[2]) * res[1] * res[0]   )
+
 
 # -----------------------------
 class extendableOption(Option):
@@ -37,13 +48,40 @@ class extendableOption(Option):
       Option.take_action(self, action, dest, opt, value, values, parser)
 
 
-def gridLocation(idx,res):
-  return ( idx  % res[0], \
-         ( idx // res[0]) % res[1], \
-         ( idx // res[0] // res[1]) % res[2] )
+# -----------------------------
+class backgroundMessage(threading.Thread):
+# -----------------------------
+    
+    def __init__(self):
+        threading.Thread.__init__(self)
+        self.message = ''
+        self.new_message = ''
+        self.counter = 0
+        self.symbols = ['- ', '\ ', '| ', '/ ']
+        self.waittime = 0.5
+    
+    def __quit__(self):
+        length = len(self.message) + len(self.symbols[self.counter])
+        sys.stderr.write(chr(8)*length + ' '*length + chr(8)*length)
+        sys.stderr.write('')
+    
+    def run(self):
+        while not threading.enumerate()[0]._Thread__stopped:
+            time.sleep(self.waittime)
+            self.update_message()
+        self.__quit__()
 
-def gridIndex(location,res):
-  return ( location[0] % res[0]                   + \
-         ( location[1] % res[1]) * res[0]          + \
-         ( location[2] % res[2]) * res[1] * res[0]   )
+    def set_message(self, new_message):
+        self.new_message = new_message
+        self.print_message()
+    
+    def print_message(self):
+        length = len(self.message) + len(self.symbols[self.counter])
+        sys.stderr.write(chr(8)*length + ' '*length + chr(8)*length)                                # delete former message
+        sys.stderr.write(self.symbols[self.counter] + self.new_message)                             # print new message
+        self.message = self.new_message
+        
+    def update_message(self):
+        self.counter = (self.counter + 1)%len(self.symbols)
+        self.print_message()