--- a/mercurial/cffi/bdiff.py	Tue May 02 21:15:31 2017 +0900
+++ b/mercurial/cffi/bdiff.py	Tue May 02 21:45:10 2017 +0900
@@ -15,64 +15,62 @@
 ffi = _bdiff.ffi
 lib = _bdiff.lib
 
-if True:
-    if True:
-        def blocks(sa, sb):
-            a = ffi.new("struct bdiff_line**")
-            b = ffi.new("struct bdiff_line**")
-            ac = ffi.new("char[]", str(sa))
-            bc = ffi.new("char[]", str(sb))
-            l = ffi.new("struct bdiff_hunk*")
-            try:
-                an = lib.bdiff_splitlines(ac, len(sa), a)
-                bn = lib.bdiff_splitlines(bc, len(sb), b)
-                if not a[0] or not b[0]:
-                    raise MemoryError
-                count = lib.bdiff_diff(a[0], an, b[0], bn, l)
-                if count < 0:
-                    raise MemoryError
-                rl = [None] * count
-                h = l.next
-                i = 0
-                while h:
-                    rl[i] = (h.a1, h.a2, h.b1, h.b2)
-                    h = h.next
-                    i += 1
-            finally:
-                lib.free(a[0])
-                lib.free(b[0])
-                lib.bdiff_freehunks(l.next)
-            return rl
+def blocks(sa, sb):
+    a = ffi.new("struct bdiff_line**")
+    b = ffi.new("struct bdiff_line**")
+    ac = ffi.new("char[]", str(sa))
+    bc = ffi.new("char[]", str(sb))
+    l = ffi.new("struct bdiff_hunk*")
+    try:
+        an = lib.bdiff_splitlines(ac, len(sa), a)
+        bn = lib.bdiff_splitlines(bc, len(sb), b)
+        if not a[0] or not b[0]:
+            raise MemoryError
+        count = lib.bdiff_diff(a[0], an, b[0], bn, l)
+        if count < 0:
+            raise MemoryError
+        rl = [None] * count
+        h = l.next
+        i = 0
+        while h:
+            rl[i] = (h.a1, h.a2, h.b1, h.b2)
+            h = h.next
+            i += 1
+    finally:
+        lib.free(a[0])
+        lib.free(b[0])
+        lib.bdiff_freehunks(l.next)
+    return rl
 
-        def bdiff(sa, sb):
-            a = ffi.new("struct bdiff_line**")
-            b = ffi.new("struct bdiff_line**")
-            ac = ffi.new("char[]", str(sa))
-            bc = ffi.new("char[]", str(sb))
-            l = ffi.new("struct bdiff_hunk*")
-            try:
-                an = lib.bdiff_splitlines(ac, len(sa), a)
-                bn = lib.bdiff_splitlines(bc, len(sb), b)
-                if not a[0] or not b[0]:
-                    raise MemoryError
-                count = lib.bdiff_diff(a[0], an, b[0], bn, l)
-                if count < 0:
-                    raise MemoryError
-                rl = []
-                h = l.next
-                la = lb = 0
-                while h:
-                    if h.a1 != la or h.b1 != lb:
-                        lgt = (b[0] + h.b1).l - (b[0] + lb).l
-                        rl.append(struct.pack(">lll", (a[0] + la).l - a[0].l,
-                            (a[0] + h.a1).l - a[0].l, lgt))
-                        rl.append(str(ffi.buffer((b[0] + lb).l, lgt)))
-                    la = h.a2
-                    lb = h.b2
-                    h = h.next
+def bdiff(sa, sb):
+    a = ffi.new("struct bdiff_line**")
+    b = ffi.new("struct bdiff_line**")
+    ac = ffi.new("char[]", str(sa))
+    bc = ffi.new("char[]", str(sb))
+    l = ffi.new("struct bdiff_hunk*")
+    try:
+        an = lib.bdiff_splitlines(ac, len(sa), a)
+        bn = lib.bdiff_splitlines(bc, len(sb), b)
+        if not a[0] or not b[0]:
+            raise MemoryError
+        count = lib.bdiff_diff(a[0], an, b[0], bn, l)
+        if count < 0:
+            raise MemoryError
+        rl = []
+        h = l.next
+        la = lb = 0
+        while h:
+            if h.a1 != la or h.b1 != lb:
+                lgt = (b[0] + h.b1).l - (b[0] + lb).l
+                rl.append(struct.pack(">lll", (a[0] + la).l - a[0].l,
+                                      (a[0] + h.a1).l - a[0].l, lgt))
+                rl.append(str(ffi.buffer((b[0] + lb).l, lgt)))
+            la = h.a2
+            lb = h.b2
+            h = h.next
 
-            finally:
-                lib.free(a[0])
-                lib.free(b[0])
-                lib.bdiff_freehunks(l.next)
-            return "".join(rl)
+    finally:
+        lib.free(a[0])
+        lib.free(b[0])
+        lib.bdiff_freehunks(l.next)
+    return "".join(rl)