There is a common set of simple tasks that many build configurations rely
on as they become more complex. Most build tools have special
purpose constructs for performing these tasks, but since &SConscript;
files are &Python; scripts, you can use more flexible built-in &Python;
services to perform these tasks. This appendix lists a number of these
tasks and how to implement them in &Python;.
Wildcard globbing to create a list of filenames
files = Glob(wildcard)
Filename extension substitution
import os.path
filename = os.path.splitext(filename)[0]+extension
Appending a path prefix to a list of filenames
import os.path
filenames = [os.path.join(prefix, x) for x in filenames]
or in Python 1.5.2:
import os.path
new_filenames = []
for x in filenames:
new_filenames.append(os.path.join(prefix, x))
Substituting a path prefix with another one
if filename.find(old_prefix) == 0:
filename = filename.replace(old_prefix, new_prefix)
or in Python 1.5.2:
import string
if string.find(filename, old_prefix) == 0:
filename = string.replace(filename, old_prefix, new_prefix)
Filtering a filename list to exclude/retain only a specific set
of extensions
import os.path
filenames = [x for x in filenames if os.path.splitext(x)[1] in extensions]
or in Python 1.5.2:
import os.path
new_filenames = []
for x in filenames:
if os.path.splitext(x)[1] in extensions:
new_filenames.append(x)
The "backtick function": run a shell command and capture the
output
import os
output = os.popen(command).read()