add ProgressBar.override_limits()

Author: Ken Kundert

doc/releases.rst

@@ -10,6 +10,7 @@ Latest development release
     | Released: 2024-12-11
 
 - Added :func:`is_array`.
+- Added :meth:`ProgressBar.override_limit()`.
 
 
 1.33 (2024-12-11)

inform/inform.py

@@ -1991,17 +1991,44 @@ def __init__(
             except OSError:
                 width=79
 
+        self.override_limits(stop, start, log)
+
         self.major = width//10
         self.width = 10*self.major
+        self.prefix = prefix
+        self.informant = display if informant is True else informant
+        self.prev_index = 0
+        self.started = False
+        self.informer = get_informer()
+
+        # prepare for use of markers
+        def to_color(c):
+            if c:
+                return Color(c) if is_str(c) else c
+            return lambda c : c
+        self.markers = {None: ('⋅', to_color(None))}
+        self.markers.update({k:(v[0], to_color(v[1])) for k,v in markers.items()})
+        self.prev_marker = None
+        self.use_prev_marker = False
+        self.previously_shown = ''
+
+    # override_limits() {{{3
+    def override_limits(self, stop, start, log):
+        """
+        Overrides start, stop, and log settings
 
-        # process start, stop, log, etc.
+        Not normally needed. Generally used to give the limits when they are not
+        known in advance.  Initiate with bogus limits and use this function to
+        override before the first draw operation.
+        """
         try:
             self.iterator = stop
             stop = len(stop)
             start = 0
-            log = False
+            assert not log
         except TypeError:
             self.iterator = None
+
         if log:
             from math import log10
             start = log10(start)
@@ -2013,25 +2040,10 @@ def __init__(
         self.start = start
         self.stop = stop
         self.log = log
-        self.prefix = prefix
-        self.informant = display if informant is True else informant
-        self.prev_index = 0
-        self.started = False
-        self.finished = not bool(stop - start)
+
+        self.finished = stop == start
             # if stop == start, just declare progress bar to be done;
             # doing so avoids the divide by zero problem
-        self.informer = get_informer()
-
-        # prepare for use of markers
-        def to_color(c):
-            if c:
-                return Color(c) if is_str(c) else c
-            return lambda c : c
-        self.markers = {None: ('⋅', to_color(None))}
-        self.markers.update({k:(v[0], to_color(v[1])) for k,v in markers.items()})
-        self.prev_marker = None
-        self.use_prev_marker = False
-        self.previously_shown = ''
 
     # draw() {{{3
     def draw(self, abscissa, marker=None):