Add automatic build of libcapnp if it's not detected

buildutils/constants.py

@@ -0,0 +1,83 @@
+"""
+script for generating files that involve repetitive updates for zmq constants.
+
+Run this after updating utils/constant_names
+
+Currently generates the following files from templates:
+
+- constant_enums.pxi
+- constants.pxi
+- zmq_constants.h
+
+"""
+
+# Copyright (C) PyZMQ Developers
+# Distributed under the terms of the Modified BSD License.
+
+import os
+import sys
+
+from . import info
+pjoin = os.path.join
+
+root = os.path.abspath(pjoin(os.path.dirname(__file__), os.path.pardir))
+
+sys.path.insert(0, pjoin(root, 'zmq', 'utils'))
+from constant_names import all_names, no_prefix
+
+ifndef_t = """#ifndef {0}
+    #define {0} (_PYZMQ_UNDEFINED)
+#endif
+"""
+
+def cython_enums():
+    """generate `enum: ZMQ_CONST` block for constant_enums.pxi"""
+    lines = []
+    for name in all_names:
+        if no_prefix(name):
+            lines.append('enum: ZMQ_{0} "{0}"'.format(name))
+        else:
+            lines.append('enum: ZMQ_{0}'.format(name))
+            
+    return dict(ZMQ_ENUMS='\n    '.join(lines))
+
+def ifndefs():
+    """generate `#ifndef ZMQ_CONST` block for zmq_constants.h"""
+    lines = ['#define _PYZMQ_UNDEFINED (-9999)']
+    for name in all_names:
+        if not no_prefix(name):
+            name = 'ZMQ_%s' % name
+        lines.append(ifndef_t.format(name))
+    return dict(ZMQ_IFNDEFS='\n'.join(lines))
+
+def constants_pyx():
+    """generate CONST = ZMQ_CONST and __all__ for constants.pxi"""
+    all_lines = []
+    assign_lines = []
+    for name in all_names:
+        if name == "NULL":
+            # avoid conflict with NULL in Cython
+            assign_lines.append("globals()['NULL'] = ZMQ_NULL")
+        else:
+            assign_lines.append('{0} = ZMQ_{0}'.format(name))
+        all_lines.append('  "{0}",'.format(name))
+    return dict(ASSIGNMENTS='\n'.join(assign_lines), ALL='\n'.join(all_lines))
+
+def generate_file(fname, ns_func, dest_dir="."):
+    """generate a constants file from its template"""
+    with open(pjoin(root, 'buildutils', 'templates', '%s' % fname), 'r') as f:
+        tpl = f.read()
+    out = tpl.format(**ns_func())
+    dest = pjoin(dest_dir, fname)
+    info("generating %s from template" % dest)
+    with open(dest, 'w') as f:
+        f.write(out)
+
+def render_constants():
+    """render generated constant files from templates"""
+    generate_file("constant_enums.pxi", cython_enums, pjoin(root, 'zmq', 'backend', 'cython'))
+    generate_file("constants.pxi", constants_pyx, pjoin(root, 'zmq', 'backend', 'cython'))
+    generate_file("zmq_constants.h", ifndefs, pjoin(root, 'zmq', 'utils'))
+
+if __name__ == '__main__':
+    render_constants()