Build kitty against bundled glfw

glfw/glfw.py

@@ -15,7 +15,10 @@ base = os.path.dirname(os.path.abspath(__file__))
 
 def init_env(env, pkg_config, at_least_version, module='x11'):
     ans = env.copy()
-    ans.cflags = [x for x in ans.cflags if x not in '-Wpedantic -Wextra -pedantic-errors'.split()]
+    ans.cflags = [
+        x for x in ans.cflags
+        if x not in '-Wpedantic -Wextra -pedantic-errors'.split()
+    ]
     ans.cflags.append('-pthread')
     ans.cflags.append('-fpic')
     ans.ldpaths.append('-pthread')
@@ -75,6 +78,113 @@ def patch_in_file(path, pfunc):
         f.write(nraw)
 
 
+class Arg:
+
+    def __init__(self, decl):
+        self.type, self.name = decl.rsplit(' ', 1)
+        self.type = self.type.strip()
+        self.name = self.name.strip()
+        while self.name.startswith('*'):
+            self.name = self.name[1:]
+            self.type = self.type + '*'
+
+    def __repr__(self):
+        return 'Arg({}, {})'.format(self.type, self.name)
+
+
+class Function:
+
+    def __init__(self, declaration):
+        m = re.match(
+            r'(.+?)\s+(glfw[A-Z][a-zA-Z0-9]+)[(](.+)[)]$', declaration
+        )
+        if m is None:
+            raise SystemExit('Failed to parse ' + declaration)
+        self.restype = m.group(1).strip()
+        self.name = m.group(2)
+        args = m.group(3).strip().split(',')
+        args = [x.strip() for x in args]
+        self.args = []
+        for a in args:
+            if a == 'void':
+                continue
+            self.args.append(Arg(a))
+
+    def declaration(self):
+        return 'typedef {restype} (*{name}_func)({args});\n{name}_func {name}_impl;\n#define {name} {name}_impl'.format(
+            restype=self.restype,
+            name=self.name,
+            args=', '.join(a.type for a in self.args)
+        )
+
+    def load(self):
+        ans = '*(void **) (&{name}_impl) = dlsym(handle, "{name}");'.format(
+            name=self.name
+        )
+        ans += '\n    if ({name}_impl == NULL) fail("Failed to load glfw function {name} with error: %s", dlerror());'.format(
+            name=self.name
+        )
+        return ans
+
+
+def generate_wrappers(glfw_header, glfw_native_header):
+    src = open(glfw_header).read()
+    functions = []
+    first = None
+    for m in re.finditer(r'^GLFWAPI\s+(.+[)]);\s*$', src, flags=re.MULTILINE):
+        if first is None:
+            first = m.start()
+        decl = m.group(1)
+        if 'VkInstance' in decl:
+            continue
+        functions.append(Function(decl))
+    declarations = [f.declaration() for f in functions]
+    p = src.find(' * GLFW API tokens')
+    p = src.find('*/', p)
+    preamble = src[p + 2:first]
+    header = '''\
+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+{}
+
+{}
+
+const char* load_glfw(const char* path);
+'''.format(preamble, '\n\n'.join(declarations))
+    with open('../kitty/glfw-wrapper.h', 'w') as f:
+        f.write(header)
+
+    code = '''
+#include <dlfcn.h>
+#include "data-types.h"
+#include "glfw-wrapper.h"
+
+static void* handle = NULL;
+
+#define fail(msg, ...) { snprintf(buf, sizeof(buf), msg, __VA_ARGS__); return buf; }
+
+const char*
+load_glfw(const char* path) {
+    static char buf[2048];
+    handle = dlopen(path, RTLD_LAZY);
+    if (handle == NULL) fail("Failed to dlopen %s with error: %s", path, dlerror());
+    dlerror();
+
+    LOAD
+
+    return NULL;
+}
+
+void
+unload_glfw() {
+    if (handle) { dlclose(handle); handle = NULL; }
+}
+'''.replace('LOAD', '\n\n    '.join(f.load() for f in functions))
+    with open('../kitty/glfw-wrapper.c', 'w') as f:
+        f.write(code)
+
+
 def main():
     os.chdir(sys.argv[-1])
     sinfo = collect_source_information()
@@ -84,6 +194,7 @@ def main():
         for name in headers + sources:
             files_to_copy.add(os.path.abspath(os.path.join('src', name)))
     glfw_header = os.path.abspath('include/GLFW/glfw3.h')
+    glfw_native_header = os.path.abspath('include/GLFW/glfw3native.h')
     os.chdir(base)
     for x in os.listdir('.'):
         if x.rpartition('.') in ('c', 'h'):
@@ -99,6 +210,7 @@ def main():
         ensure_ascii=False,
         sort_keys=True
     )
+    generate_wrappers(glfw_header, glfw_native_header)
 
 
 if __name__ == '__main__':