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#!/usr/bin/env python
# vim: ts=2 sw=2
from __future__ import print_function
import optparse
import sys
try:
raw_input
except NameError:
raw_input = input
class Dependency:
def __init__(self, tgt):
self.tgt = tgt
self.pos = ""
self.prereqs = set()
self.visit = 0
def add(self, prereq):
self.prereqs.add(prereq)
class Dependencies:
def __init__(self):
self.lines = {}
self.__visit = 0
self.count = 0
def add(self, tgt, prereq):
t = self.lines.get(tgt)
if not t:
t = Dependency(tgt)
self.lines[tgt] = t
p = self.lines.get(prereq)
if not p:
p = Dependency(prereq)
self.lines[prereq] = p
t.add(p)
self.count = self.count + 1
def setPos(self, tgt, pos):
t = self.lines.get(tgt)
if not t:
t = Dependency(tgt)
self.lines[tgt] = t
t.pos = pos
def get(self, tgt):
if tgt in self.lines:
return self.lines[tgt]
else:
return None
def __iter__(self):
if hasattr(self.lines, 'iteritems'):
return self.lines.iteritems()
return iter(self.lines.items())
def trace(self, tgt, prereq):
self.__visit = self.__visit + 1
d = self.lines.get(tgt)
if not d:
return
return self.__trace(d, prereq)
def __trace(self, d, prereq):
if d.visit == self.__visit:
return d.trace
if d.tgt == prereq:
return [ [ d ], ]
d.visit = self.__visit
result = []
for pre in d.prereqs:
recursed = self.__trace(pre, prereq)
for r in recursed:
result.append([ d ] + r)
d.trace = result
return result
def help():
print("Commands:")
print(" dep TARGET Print the prerequisites for TARGET")
print(" trace TARGET PREREQ Print the paths from TARGET to PREREQ")
def main(argv):
opts = optparse.OptionParser()
opts.add_option("-i", "--interactive", action="store_true", dest="interactive",
help="Interactive mode")
(options, args) = opts.parse_args()
deps = Dependencies()
filename = args[0]
print("Reading %s" % filename)
if True:
f = open(filename)
for line in f:
line = line.strip()
if len(line) > 0:
if line[0] == '#':
pos,tgt = line.rsplit(":", 1)
pos = pos[1:].strip()
tgt = tgt.strip()
deps.setPos(tgt, pos)
else:
(tgt,prereq) = line.split(':', 1)
tgt = tgt.strip()
prereq = prereq.strip()
deps.add(tgt, prereq)
f.close()
print("Read %d dependencies. %d targets." % (deps.count, len(deps.lines)))
while True:
line = raw_input("target> ")
if not line.strip():
continue
split = line.split()
cmd = split[0]
if len(split) == 2 and cmd == "dep":
tgt = split[1]
d = deps.get(tgt)
if d:
for prereq in d.prereqs:
print(prereq.tgt)
elif len(split) == 3 and cmd == "trace":
tgt = split[1]
prereq = split[2]
if False:
print("from %s to %s" % (tgt, prereq))
trace = deps.trace(tgt, prereq)
if trace:
width = 0
for g in trace:
for t in g:
if len(t.tgt) > width:
width = len(t.tgt)
for g in trace:
for t in g:
if t.pos:
print(t.tgt, " " * (width-len(t.tgt)), " #", t.pos)
else:
print(t.tgt)
print()
else:
help()
if __name__ == "__main__":
try:
main(sys.argv)
except KeyboardInterrupt:
print()
except EOFError:
print()
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