separate bitcoin related functions from wallet.py

lib/util.py

@@ -1,6 +1,5 @@
-import os
+import os, sys
 import platform
-import sys
 
 def print_error(*args):
     # Stringify args
@@ -8,6 +7,7 @@ def print_error(*args):
     sys.stderr.write(" ".join(args) + "\n")
     sys.stderr.flush()
 
+
 def user_dir():
     if "HOME" in os.environ:
       return os.path.join(os.environ["HOME"], ".electrum")
@@ -18,6 +18,7 @@ def user_dir():
     else:
       raise BaseException("No home directory found in environment variables.")
 
+
 def appdata_dir():
     """Find the path to the application data directory; add an electrum folder and return path."""
     if platform.system() == "Windows":
@@ -30,9 +31,11 @@ def appdata_dir():
     else:
         raise Exception("Unknown system")
 
+
 def get_resource_path(*args):
     return os.path.join(".", *args)
 
+
 def local_data_dir():
     """Return path to the data folder."""
     assert sys.argv
@@ -40,3 +43,23 @@ def local_data_dir():
     local_data = os.path.join(prefix_path, "data")
     return local_data
 
+
+def format_satoshis(x, is_diff=False, num_zeros = 0):
+    from decimal import Decimal
+    s = Decimal(x)
+    sign, digits, exp = s.as_tuple()
+    digits = map(str, digits)
+    while len(digits) < 9:
+        digits.insert(0,'0')
+    digits.insert(-8,'.')
+    s = ''.join(digits).rstrip('0')
+    if sign: 
+        s = '-' + s
+    elif is_diff:
+        s = "+" + s
+
+    p = s.find('.')
+    s += "0"*( 1 + num_zeros - ( len(s) - p ))
+    s += " "*( 9 - ( len(s) - p ))
+    s = " "*( 5 - ( p )) + s
+    return s