Prevent regress. debootstrap can give lower percentage when downloading (bug?)

1 files changed, 11 insertions, 8 deletions

diff --git a/lib/snack/__init__.py b/lib/snack/__init__.py
index d196f49..31794ee 100644
--- a/lib/snack/__init__.py
+++ b/lib/snack/__init__.py
@@ -54,6 +54,7 @@ class ProgressBar(object):
     _form = None
     _scale = None
     _grid = None
+    _allow_back = False
 
     @property
     def text(self):
@@ -75,21 +76,22 @@ class ProgressBar(object):
             i = math.ceil(i)
         if i > self._top:
             i = self._top
-        self._progress = int(i)
-        self._scale.set(self._progress)
-        self._refresh()
-
-    def advance(self, increment = 1):
-        self.progress = self._progress + increment
-
+        i = int(i)
+        if i > self._progress or self._allow_back:
+            self._progress = int(i)
+            self._scale.set(self._progress)
+            self._refresh()
 
+    def advance(self, i=1):
+        self.progress = self._progress + i
 
     def _refresh(self):
         self._form.draw()
         self._screen.refresh()
 
 
-    def __init__(self, screen, width=40, title='', text=' ', top=100):
+    def __init__(self, screen, width=40, title='', text=' ', top=100, allow_back=False):
+        self._allow_back = allow_back
         self._screen = screen
         self._top = top
 
@@ -107,6 +109,7 @@ class ProgressBar(object):
         self._form = Form()
         self._form.add(self._textbox)
         self._form.add(self._scale)
+        self._refresh()
 
     
     def __del__(self):