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Limit size of savepoint history

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Kovid Goyal 2013-11-04 09:55:01 +05:30
parent e993381e88
commit 807dfa5c6a
1 changed files with 11 additions and 0 deletions
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11
src/calibre/gui2/tweak_book/undo.py
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@ -8,6 +8,8 @@ __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
import shutil import shutil
MAX_SAVEPOINTS = 100
def cleanup(containers): def cleanup(containers):
for container in containers: for container in containers:
try: try:
@ -42,8 +44,17 @@ class GlobalUndoHistory(object):
self.states = self.states[:self.pos+1] self.states = self.states[:self.pos+1]
self.states.append(State(new_container)) self.states.append(State(new_container))
self.pos += 1 self.pos += 1
if len(self.states) > MAX_SAVEPOINTS:
num = len(self.states) - MAX_SAVEPOINTS
cleanup(self.states[:num])
self.states = self.states[num:]
def rewind_savepoint(self): def rewind_savepoint(self):
''' Revert back to the last save point, should only be used immediately
after a call to add_savepoint. If there are intervening calls to undo
or redo, behavior is undefined. This is intended to be used in the case
where you create savepoint, perform some operation, operation fails, so
revert to state before creating savepoint. '''
if self.pos > 0 and self.pos == len(self.states) - 1: if self.pos > 0 and self.pos == len(self.states) - 1:
self.pos -= 1 self.pos -= 1
cleanup(self.states.pop()) cleanup(self.states.pop())