def target_update(target, deps, cmd):
"""Update a target with a given command given a list of dependencies.
target_update(target,deps,cmd) -> runs cmd if target is outdated.
This is just a wrapper around target_outdated() which calls the given
command if target is outdated."""
if target_outdated(target, deps):
xsys(cmd)
def page_file(fname, start=0, pager_cmd=None):
"""Page a file, using an optional pager command and starting line.
"""
pager_cmd = get_pager_cmd(pager_cmd)
pager_cmd += ' ' + get_pager_start(pager_cmd,start)
try:
if os.environ['TERM'] in ['emacs','dumb']:
raise EnvironmentError
xsys(pager_cmd + ' ' + fname)
except:
try:
if start > 0:
start -= 1
page(open(fname).read(),start)
except:
print 'Unable to show file',`fname`