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# Go to a requested generation. The given generation can be an
# absolute number like 1,000,000 (commas are optional) or a number
# relative to the current generation like +9 or -6. If the target
# generation is less than the current generation then we go back
# to the starting generation (normally 0) and advance to the target.
# Authors: Andrew Trevorrow and Dave Greene, April 2006.
# Updated Sept-Oct 2006 -- XRLE support and reusable default value.
from glife import validint
from time import time
import os
import golly
# --------------------------------------------------------------------
def goto(gen):
currgen = int(golly.getgen())
if gen[0] == '+':
n = int(gen[1:])
newgen = currgen + n
elif gen[0] == '-':
n = int(gen[1:])
if currgen > n:
newgen = currgen - n
else:
newgen = 0
else:
newgen = int(gen)
if newgen < currgen:
# try to go back to starting gen (not necessarily 0) and
# then forwards to newgen; note that reset() also restores
# algorithm and/or rule, so too bad if user changed those
# after the starting info was saved;
# first save current location and scale
midx, midy = golly.getpos()
mag = golly.getmag()
golly.reset()
# restore location and scale
golly.setpos(midx, midy)
golly.setmag(mag)
# current gen might be > 0 if user loaded a pattern file
# that set the gen count
currgen = int(golly.getgen())
if newgen < currgen:
golly.error("Can't go back any further; pattern was saved "\
+ "at generation " + str(currgen) + ".")
return
golly.show("Hit escape to abort...")
oldsecs = time()
while currgen < newgen:
if golly.empty():
golly.show("Pattern is empty.")
return
# using golly.step() as a faster method for getting to newgen
# is left as an exercise for the reader :)
golly.run(1)
currgen += 1
golly.dokey( golly.getkey() ) # allow keyboard interaction
newsecs = time()
if newsecs - oldsecs >= 1.0: # do an update every sec
oldsecs = newsecs
golly.update()
golly.show("")
# --------------------------------------------------------------------
# use same file name as in goto.pl
GotoINIFileName = golly.getdir("data") + "goto.ini"
previousgen = ""
if os.access(GotoINIFileName, os.R_OK):
f = open(GotoINIFileName, 'r')
previousgen = f.readline()
f.close()
if not validint(previousgen):
previousgen = ""
gen = golly.getstring("Enter the desired generation number,\n" +
"or -n/+n to go back/forwards by n:",
previousgen, "Go to generation")
if len(gen) == 0:
golly.exit()
elif gen == "+" or gen == "-":
# clear the default
previousgen = ""
elif not validint(gen):
golly.exit('Sorry, but "' + gen + '" is not a valid integer.')
else:
previousgen = gen
goto(gen.replace(",",""))
if os.access(GotoINIFileName, os.W_OK) or not os.access(GotoINIFileName, os.F_OK):
try:
f = open(GotoINIFileName, 'w')
f.write(previousgen)
f.close()
except:
golly.show("Unable to save defaults to " + GotoINIFileName)
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