1 files changed, 100 insertions, 0 deletions
diff --git a/libclc/build/metabuild.py b/libclc/build/metabuild.py
new file mode 100644
index 0000000..4ab5db5
--- /dev/null
+++ b/libclc/build/metabuild.py
@@ -0,0 +1,100 @@
+import ninja_syntax
+import os
+
+# Simple meta-build system.
+
+class Make(object):
+  def __init__(self):
+    self.output = open(self.output_filename(), 'w')
+    self.rules = {}
+    self.rule_text = ''
+    self.all_targets = []
+    self.default_targets = []
+    self.clean_files = []
+    self.distclean_files = []
+    self.output.write("""all::
+
+ifndef VERBOSE
+  Verb = @
+endif
+
+""")
+
+  def output_filename(self):
+    return 'Makefile'
+
+  def rule(self, name, command, description=None, depfile=None,
+           generator=False):
+    self.rules[name] = {'command': command, 'description': description,
+                        'depfile': depfile, 'generator': generator}
+
+  def build(self, output, rule, inputs=[], implicit=[], order_only=[]):
+    inputs = self._as_list(inputs)
+    implicit = self._as_list(implicit)
+    order_only = self._as_list(order_only)
+
+    output_dir = os.path.dirname(output)
+    if output_dir != '' and not os.path.isdir(output_dir):
+      os.makedirs(output_dir)
+
+    dollar_in = ' '.join(inputs)
+    subst = lambda text: text.replace('$in', dollar_in).replace('$out', output)
+
+    deps = ' '.join(inputs + implicit)
+    if order_only:
+      deps += ' | '
+      deps += ' '.join(order_only)
+    self.output.write('%s: %s\n' % (output, deps))
+
+    r = self.rules[rule]
+    command = subst(r['command'])
+    if r['description']:
+      desc = subst(r['description'])
+      self.output.write('\t@echo %s\n\t$(Verb) %s\n' % (desc, command))
+    else:
+      self.output.write('\t%s\n' % command)
+    if r['depfile']:
+      depfile = subst(r['depfile'])
+      self.output.write('-include '+depfile+'\n')
+    self.output.write('\n')
+
+    self.all_targets.append(output)
+    if r['generator']:
+      self.distclean_files.append(output)
+      if r['depfile']:
+        self.distclean_files.append(depfile)
+    else:
+      self.clean_files.append(output)
+      if r['depfile']:
+        self.distclean_files.append(depfile)
+
+
+  def _as_list(self, input):
+    if isinstance(input, list):
+      return input
+    return [input]
+
+  def default(self, paths):
+    self.default_targets += self._as_list(paths)
+
+  def finish(self):
+    self.output.write('all:: %s\n\n' % ' '.join(self.default_targets or self.all_targets))
+    self.output.write('clean: \n\trm -f %s\n\n' % ' '.join(self.clean_files))
+    self.output.write('distclean: clean\n\trm -f %s\n' % ' '.join(self.distclean_files))
+
+class Ninja(ninja_syntax.Writer):
+  def __init__(self):
+    ninja_syntax.Writer.__init__(self, open(self.output_filename(), 'w'))
+
+  def output_filename(self):
+    return 'build.ninja'
+
+  def finish(self):
+    pass
+
+def from_name(name):
+  if name == 'make':
+    return Make()
+  if name == 'ninja':
+    return Ninja()
+  raise LookupError, 'unknown generator: %s; supported generators are make and ninja' % name