Add a more flexible converter from Makefile.in to Makefile

1 files changed, 80 insertions, 0 deletions

diff --git a/attoconf/lib/templates.py b/attoconf/lib/templates.py
new file mode 100644
index 0000000..791dd62
--- /dev/null
+++ b/attoconf/lib/templates.py
@@ -0,0 +1,80 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+import os
+import sys
+
+from ..classy import ClassyProject
+
+
+class TemplateHook(object):
+    __slots__ = ('outfiles')
+    def __init__(self, outfiles):
+        self.outfiles = outfiles
+
+    def __call__(self, build):
+        build.vars['SRC_DIR'] = (build.relative_source(), 'special')
+        unseen = set(build.project.order)
+        if None in unseen:
+            unseen.remove(None)
+        for outfile in self.outfiles:
+            infile = outfile + '.in'
+            print('Generating %s from %s' % (outfile, infile))
+            # by replacing all instances of @VARIABLE@ with the value
+
+            slurpee = open(os.path.join(build.project.srcdir, infile)).read()
+            for var in build.project.order:
+                if var is None:
+                    continue
+                val, origin = build.vars[var]
+                key = '@' + var + '@'
+                if key not in slurpee:
+                    continue
+                if var in unseen:
+                    unseen.remove(var)
+                slurpee = slurpee.replace(key, str(val))
+                # origin is not so useful, given config.status
+            with open(os.path.join(build.builddir, outfile), 'w') as out:
+                out.write(slurpee)
+        if unseen:
+            print('WARNING: variables not used:')
+            print('  ' + '\n  '.join(unseen))
+        # lone @s may legitimately appear in the makefile.
+        # paired @s, which would be a forgotten subst, will be obvious.
+
+
+class Templates(ClassyProject):
+    ''' Post hook to generate output files from *.in templates
+    '''
+    __slots__ = ()
+    @classmethod
+    def slots(cls):
+        return super(Templates, cls).slots() + ('template_files',)
+
+    # this class didn't exist in attoconf < 0.7, no need for compatibility
+    def __init__(self, template_files, **kwargs):
+        super(Templates, self).__init__(**kwargs)
+        self.template_files = template_files
+
+    def post(self):
+        super(Templates, self).post()
+        if 'SRC_DIR' in self.order:
+            sys.exit('ERROR: Incompatible generator hooks!')
+        self.order.insert(0, 'SRC_DIR')
+        self.checks.append(TemplateHook(self.template_files))