test/Scanner/empty-implicit.py

   1 #!/usr/bin/env python
   2 #
   3 # __COPYRIGHT__
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   6 # a copy of this software and associated documentation files (the
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   8 # without limitation the rights to use, copy, modify, merge, publish,
   9 # distribute, sublicense, and/or sell copies of the Software, and to
  10 # permit persons to whom the Software is furnished to do so, subject to
  11 # the following conditions:
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  16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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  21 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 #
  24
  25 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
  26
  27 """
  28 Verify that Scanners are not called if a previous --implicit-cache
  29 run stored an empty list of implicit dependencies.
  30 """
  31
  32 import TestSCons
  33
  34 test = TestSCons.TestSCons()
  35
  36 test.write('SConstruct', r"""
  37 import os.path
  38
  39 def scan(node, env, envkey, arg):
  40     print('XScanner: node = '+os.path.split(str(node))[1])
  41     return []
  42
  43 def exists_check(node, env):
  44     return os.path.exists(str(node))
  45
  46 XScanner = Scanner(name = 'XScanner',
  47                    function = scan,
  48                    argument = None,
  49                    scan_check = exists_check,
  50                    skeys = ['.x'])
  51
  52 def echo(env, target, source):
  53     t = os.path.split(str(target[0]))[1]
  54     s = os.path.split(str(source[0]))[1]
  55     print('create %s from %s' % (t, s))
  56     with open(t, 'wb') as ofb, open(s, 'rb') as ifb:
  57         ofb.write(ifb.read())
  58
  59 Echo = Builder(action = Action(echo, None),
  60                src_suffix = '.x',
  61                suffix = '.x')
  62
  63 env = Environment(BUILDERS = {'Echo':Echo}, SCANNERS = [XScanner])
  64
  65 f1 = env.Echo(source=['f1_in'], target=['f1_out'])
  66 """)
  67
  68 test.write('f1_in.x', 'f1_in.x\n')
  69
  70 expect = test.wrap_stdout("""\
  71 XScanner: node = f1_in.x
  72 create f1_out.x from f1_in.x
  73 """)
  74
  75 test.run(arguments = '--implicit-cache .', stdout = expect)
  76
  77 # Run it again, and the output must contain only the "up to date" message,
  78 # *not* the line printed by the XScanner function.
  79
  80 test.up_to_date(options = '--implicit-cache', arguments = '.')
  81
  82 test.pass_test()
  83
  84 # Local Variables:
  85 # tab-width:4
  86 # indent-tabs-mode:nil
  87 # End:
  88 # vim: set expandtab tabstop=4 shiftwidth=4: