#!/usr/bin/env python
#
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Test changing the C source files based on an always-executed revision
extraction and substitution.

This makes sure we evaluate the content of intermediate files as
expected.  We used to configure this explicitly using
TargetSignatures('content') but we now rely on the default behavior
being the equivalent of Decider('content').
"""

import os.path

import TestSCons

_python_ = TestSCons._python_

test = TestSCons.TestSCons()

test.write('getrevision', """
#!/usr/bin/env python
import string
print string.strip(open('revnum.in','rb').read())
""")

test.write('SConstruct', """
import re
import string

def subrevision(target, source ,env):
    orig = target[0].get_contents()
    new = re.sub('\$REV.*?\$',
                 '$REV: %%s$'%%string.strip(source[0].get_contents()),
                 target[0].get_contents())
    outf = open(str(target[0]),'wb')
    outf.write(new)
    outf.close()

SubRevision = Action(subrevision)

env=Environment()
content_env=env.Clone()
content_env.Command('revision.in', [], '%(_python_)s getrevision > $TARGET')
content_env.AlwaysBuild('revision.in')
env.Precious('main.c')
env.Command('main.c', 'revision.in', SubRevision)
exe = env.Program('main.c')
env.Default(exe)
""" % locals())

test.write('main.c', """\
#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
    printf("Revision $REV$\\n");
    exit (0);
}
""")

test.write('revnum.in', '3.2\n')

prog = 'main' + TestSCons._exe

light_build=test.wrap_stdout("""\
%(_python_)s getrevision > revision.in
""" % locals())

test.run(arguments='.')
test.must_exist(prog)
test.run(program=test.workpath(prog), stdout='Revision $REV: 3.2$\n')

test.run(arguments='.', stdout=light_build)
test.must_exist(prog)

test.run(arguments='.', stdout=light_build)
test.must_exist(prog)

test.write('revnum.in', '3.3\n')

test.run(arguments='.')
test.must_exist(prog)
test.run(program=test.workpath(prog), stdout='Revision $REV: 3.3$\n')

test.pass_test()