1 files changed, 110 insertions, 0 deletions
diff --git a/waflib/extras/cfg_altoptions.py b/waflib/extras/cfg_altoptions.py
new file mode 100644
index 00000000..47b1189f
--- /dev/null
+++ b/waflib/extras/cfg_altoptions.py
@@ -0,0 +1,110 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# Tool to extend c_config.check_cfg()
+
+__author__ = __maintainer__ = "Jérôme Carretero <cJ-waf@zougloub.eu>"
+__copyright__ = "Jérôme Carretero, 2014"
+
+"""
+
+This tool allows to work around the absence of ``*-config`` programs
+on systems, by keeping the same clean configuration syntax but inferring
+values or permitting their modification via the options interface.
+
+Note that pkg-config can also support setting ``PKG_CONFIG_PATH``,
+so you can put custom files in a folder containing new .pc files.
+This tool could also be implemented by taking advantage of this fact.
+
+Usage::
+
+   def options(opt):
+     opt.load('c_config_alt')
+     opt.add_package_option('package')
+
+   def configure(cfg):
+     conf.load('c_config_alt')
+     conf.check_cfg(...)
+
+Known issues:
+
+- Behavior with different build contexts...
+
+"""
+
+import os
+import functools
+from waflib import Configure, Options, Errors
+
+def name_to_dest(x):
+	return x.lower().replace('-', '_')
+
+
+def options(opt):
+	def x(opt, param):
+		dest = name_to_dest(param)
+		gr = opt.get_option_group("configure options")
+		gr.add_option('--%s-root' % dest,
+		 help="path containing include and lib subfolders for %s" \
+		  % param,
+		)
+
+	opt.add_package_option = functools.partial(x, opt)
+
+
+check_cfg_old = getattr(Configure.ConfigurationContext, 'check_cfg')
+
+@Configure.conf
+def check_cfg(conf, *k, **kw):
+	if k:
+		lst = k[0].split()
+		kw['package'] = lst[0]
+		kw['args'] = ' '.join(lst[1:])
+
+	if not 'package' in kw:
+		return check_cfg_old(conf, **kw)
+
+	package = kw['package']
+
+	package_lo = name_to_dest(package)
+	package_hi = package.upper().replace('-', '_') # TODO FIXME
+	package_hi = kw.get('uselib_store', package_hi)
+
+	def check_folder(path, name):
+		try:
+			assert os.path.isdir(path)
+		except AssertionError:
+			raise Errors.ConfigurationError(
+				"%s_%s (%s) is not a folder!" \
+				% (package_lo, name, path))
+		return path
+
+	root = getattr(Options.options, '%s_root' % package_lo, None)
+
+	if root is None:
+		return check_cfg_old(conf, **kw)
+	else:
+		def add_manual_var(k, v):
+			conf.start_msg('Adding for %s a manual var' % (package))
+			conf.env["%s_%s" % (k, package_hi)] = v
+			conf.end_msg("%s = %s" % (k, v))
+
+
+		check_folder(root, 'root')
+
+		pkg_inc = check_folder(os.path.join(root, "include"), 'inc')
+		add_manual_var('INCLUDES', [pkg_inc])
+		pkg_lib = check_folder(os.path.join(root, "lib"), 'libpath')
+		add_manual_var('LIBPATH', [pkg_lib])
+		add_manual_var('LIB', [package])
+
+		for x in kw.get('manual_deps', []):
+			for k, v in sorted(conf.env.get_merged_dict().items()):
+				if k.endswith('_%s' % x):
+					k = k.replace('_%s' % x, '')
+					conf.start_msg('Adding for %s a manual dep' \
+					 %(package))
+					conf.env["%s_%s" % (k, package_hi)] += v
+					conf.end_msg('%s += %s' % (k, v))
+
+		return True
+