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"""Use Flag Mechanics """
import random
import re
import math
from portage.dep import check_required_use
from subprocess import *
from .tool import unique
from gentoolkit.flag import get_flags, reduce_flags
def all_valid_flags(flag):
return True
## Useflag Combis ##
def findUseFlagCombis (package, config, port):
"""
Generate combinations of use flags to test
The output will be a list each containing a ready to use USE=... string
"""
uselist = sorted(reduce_flags(get_flags(package.packageString()[1:])))
# The uselist could have duplicates due to slot-conditional
# output of equery
uselist=unique(uselist)
for i in config['ignoreprefix']:
uselist=[u for u in uselist if not re.match(i,u)]
if config['usecombis'] == 0:
# Do only all and nothing:
swlist = [0,2**(len(uselist))-1]
# Test if we can exhaust all USE-combis by computing the binary logarithm.
elif len(uselist) > math.log(config['usecombis'],2):
# Generate a sample of USE combis
s = 2**(len (uselist))
random.seed()
swlist = [random.randint(0, s-1) for i in range (config['usecombis'])]
swlist.append(0)
swlist.append(s-1)
swlist.sort()
swlist = unique(swlist)
else:
# Yes we can: generate all combinations
swlist = list(range(2**len(uselist)))
usecombis=[]
ruse = " ".join(port.aux_get(package.packageString()[1:], ["REQUIRED_USE"]))
for sw in swlist:
mod = []
act = [] # check_required_use doesn't like -flag entries
for pos in range(len(uselist)):
if ((2**pos) & sw):
mod.append("")
act.append(uselist[pos])
else:
mod.append("-")
if bool(check_required_use(ruse, " ".join(act), all_valid_flags)):
uc = " ".join(["".join(uf) for uf in list(zip(mod, uselist))])
usecombis.append(uc)
else:
print(" " + package.packageString() + ": ignoring invalid USE flag combination", act)
# Merge everything to a USE="" string
return ["USE=\'" + uc + "\'" for uc in usecombis]
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