bindings/zig/generate.py: rearrange for better clarity.

Author: dot-asm

bindings/zig/generate.py

@@ -393,6 +393,24 @@
     os.chdir(here[0])
 
 
+def xchg_1vs2(matchobj):
+    if matchobj.group(2) == '1':
+        return matchobj.group(1) + '2'
+    else:
+        return matchobj.group(1) + '1'
+
+
+print("generating blst.zig...") or sys.stdout.flush()
+with open("blst.zig", "w") as fd:
+    print("//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", file=fd)
+    print("// DO NOT EDIT THIS FILE!!!",                         file=fd)
+    print("// The file is auto-generated by " + here[-1],        file=fd)
+    print("//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", file=fd)
+    print(top_zig,                                               file=fd)
+    print(p1_zig,                                                file=fd)
+    print(re.sub(r'((?<!f)[pgPG\*])([12])', xchg_1vs2, p1_zig),  file=fd)
+
+
 def newer(*files):
     assert len(files) > 1
     rh = files[-1]
@@ -426,31 +444,17 @@ def newer(*files):
             print("pub const {} = {};".format(key, val), file=fd)
         del pubs
 
-
-def xchg_1vs2(matchobj):
-    if matchobj.group(2) == '1':
-        return matchobj.group(1) + '2'
-    else:
-        return matchobj.group(1) + '1'
-
-
-print("generating blst.zig...") or sys.stdout.flush()
-with open("blst.zig", "w") as fd:
-    print("//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", file=fd)
-    print("// DO NOT EDIT THIS FILE!!!",                         file=fd)
-    print("// The file is auto-generated by " + here[-1],        file=fd)
-    print("//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!", file=fd)
-    print(top_zig,                                               file=fd)
-    print(p1_zig,                                                file=fd)
-    print(re.sub(r'((?<!f)[pgPG\*])([12])', xchg_1vs2, p1_zig),  file=fd)
-
 version = "0.3.16"
 
 os.chdir("../..")
-with open("build.zig.zon", "r") as fd:
-    m = re.search(r'\.version = "([^"]+)"', fd.read())
-    if m.group(1) == version:
-        sys.exit(0)
+try:
+    with open("build.zig.zon", "r") as fd:
+        m = re.search(r'\.version = "([^"]+)"', fd.read())
+        if m and m.group(1) == version:
+            sys.exit(0)
+except OSError as e:
+    if e.errno != 2:    # not "no such file or directory"
+        raise e
 
 print("generating build.zig.zon...") or sys.stdout.flush()
 zon = """.{