div by 0 error

.travis.yml

@@ -5,6 +5,8 @@ matrix:
   include:
     - python: 2.6
       env: PYV=2.6
+      before_install:
+        -  pip install pycparser==2.17
     - python: 2.7
       env: PYV=2.7
     - python: 3.4

plumbum/cli/progress.py

@@ -139,8 +139,12 @@ def done(self):
             print()
 
     def __str__(self):
-        percent = max(self.value, 0) / self.length
         width = get_terminal_size(default=(0, 0))[0]
+        if self.length == 0:
+            self.width = 0
+            return "0/0 complete"
+
+        percent = max(self.value, 0) / self.length
         ending = ' ' + (self.str_time_remaining()
                         if self.timer else '{0} of {1} complete'.format(
                             self.value, self.length))

tests/test_terminal.py

@@ -44,7 +44,7 @@ def test_str(self):
     def test_default(self, capsys):
         with send_stdin(""):
             assert prompt("Enter nothing", default='hi') == 'hi'
-        assert capsys.readouterr()[0] == "Enter nothing [hi]: " 
+        assert capsys.readouterr()[0] == "Enter nothing [hi]: "
 
     def test_typefail(self, capsys):
         with send_stdin("1.2\n13"):
@@ -78,7 +78,7 @@ def test_choose(self, capsys):
         with send_stdin("foo\n\n"):
             assert choose("What is your favorite color?", ["blue", "yellow", "green"], default = "yellow") == "yellow"
         assert capsys.readouterr()[0] == "What is your favorite color?\n(1) blue\n(2) yellow\n(3) green\nChoice [2]: Invalid choice, please try again\nChoice [2]: "
-        
+
     def test_choose_dict(self):
         with send_stdin("23\n1"):
             value = choose("Pick", dict(one="a",two="b"))
@@ -104,7 +104,7 @@ def test_choose_dict_default(self, capsys):
         with send_stdin():
             assert choose("Pick", dic, default="a") == "a"
         assert "[1]" in capsys.readouterr()[0]
-        
+
 
     def test_hexdump(self):
         data = "hello world my name is queen marry" + "A" * 66 + "foo bar"
@@ -137,3 +137,10 @@ def test_progress(self, capsys):
 
 """
         assert stdout ==  output
+
+    def test_progress_empty(self, capsys):
+        for i in Progress.range(0, has_output=True, timer=False):
+            print('hi')
+        stdout, stderr = capsys.readouterr()
+        output = '0/0 complete'
+        assert output in stdout