From eccf0ca54e38b11108c2170ae451a75083cbe64b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 31 Oct 2016 14:45:49 +0530
Subject: [PATCH] Infrastructure for building C extensions

---
 .gitignore         |  2 ++
 kitty/data-types.c | 32 +++++++++++++++++++++
 setup.py           | 70 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+)
 create mode 100644 kitty/data-types.c
 create mode 100644 setup.py

diff --git a/.gitignore b/.gitignore
index 4a39caf7b..d5211a006 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,6 @@
 *.js
 *.pyj-cached
+*.so
 .build-cache
 tags
+build
diff --git a/kitty/data-types.c b/kitty/data-types.c
new file mode 100644
index 000000000..ce097cb9d
--- /dev/null
+++ b/kitty/data-types.c
@@ -0,0 +1,32 @@
+/*
+ * data-types.c
+ * Copyright (C) 2016 Kovid Goyal <kovid at kovidgoyal.net>
+ *
+ * Distributed under terms of the GPL3 license.
+ */
+
+#include <Python.h>
+
+static PyMethodDef module_methods[] = {
+    {NULL, NULL, 0, NULL}        /* Sentinel */
+};
+
+static struct PyModuleDef module = {
+   PyModuleDef_HEAD_INIT,
+   "fast_data_types",   /* name of module */
+   NULL, /* module documentation, may be NULL */
+   -1,       /* size of per-interpreter state of the module,
+                or -1 if the module keeps state in global variables. */
+   module_methods
+};
+
+PyMODINIT_FUNC
+PyInit_fast_data_types(void) {
+    PyObject *m;
+
+    m = PyModule_Create(&module);
+    if (m == NULL) return NULL;
+
+    return m;
+}
+
diff --git a/setup.py b/setup.py
new file mode 100644
index 000000000..709e0b4d0
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
+
+import os
+import re
+import sys
+import sysconfig
+import shlex
+import subprocess
+
+base = os.path.dirname(os.path.abspath(__file__))
+build_dir = os.path.join(base, 'build')
+constants = os.path.join(base, 'kitty', 'constants.py')
+with open(constants, 'rb') as f:
+    constants = f.read().decode('utf-8')
+appname = re.search(r"^appname = '([^']+)'", constants, re.MULTILINE).group(1)
+version = tuple(map(int, re.search(r"^version = \((\d+), (\d+), (\d+)\)", constants, re.MULTILINE).group(1, 2, 3)))
+
+
+cflags = ldflags = cc = ldpaths = None
+
+
+def init_env():
+    global cflags, ldflags, cc, ldpaths
+    cc = os.environ.get('CC', 'gcc')
+    cflags = os.environ.get('OVERRIDE_CFLAGS',
+                            '-Wall -Werror -O3 -DNDEBUG -fwrapv -fstack-protector-strong -pipe')
+    cflags = shlex.split(cflags) + shlex.split(sysconfig.get_config_var('CCSHARED'))
+    ldflags = os.environ.get('OVERRIDE_LDFLAGS', '-Wall -O3')
+    ldflags = shlex.split(ldflags)
+    cflags += shlex.split(os.environ.get('CFLAGS', ''))
+    ldflags += shlex.split(os.environ.get('LDFLAGS', ''))
+
+    cflags.append('-pthread')
+    ldflags.append('-pthread')
+    ldflags.append('-shared')
+    cflags.append('-I' + sysconfig.get_config_var('CONFINCLUDEPY'))
+    lib = sysconfig.get_config_var('LDLIBRARY')[3:-3]
+    ldpaths = ['-L' + sysconfig.get_config_var('LIBDIR'), '-l' + lib]
+
+    try:
+        os.mkdir(build_dir)
+    except FileExistsError:
+        pass
+
+
+def run_tool(cmd):
+    if isinstance(cmd, str):
+        cmd = shlex.split(cmd[0])
+    print(' '.join(cmd))
+    p = subprocess.Popen(cmd)
+    ret = p.wait()
+    if ret != 0:
+        raise SystemExit(ret)
+
+
+def compile_c_extension(module, *sources):
+    prefix = os.path.basename(module)
+    objects = [os.path.join(build_dir, prefix + '-' + os.path.basename(src) + '.o') for src in sources]
+    for src, dest in zip(sources, objects):
+        src = os.path.join(base, src)
+        run_tool([cc] + cflags + ['-c', src] + ['-o', dest])
+    run_tool([cc] + ldflags + objects + ldpaths + ['-o', os.path.join(base, module + '.so')])
+
+if __name__ == '__main__':
+    if sys.version_info < (3, 5):
+        raise SystemExit('python >= 3.5 required')
+    init_env()
+    compile_c_extension('kitty/fast_data_types', 'kitty/data-types.c')