custom format now search for the best clang-format version

.clang-format

@@ -124,7 +124,7 @@ RawStringFormats:
     CanonicalDelimiter: ''
     BasedOnStyle:    google
 ReflowComments:  true
-SortIncludes:    true
+SortIncludes:    false
 SortUsingDeclarations: true
 SpaceAfterCStyleCast: false
 SpaceAfterTemplateKeyword: true

.custom-format.py

@@ -2,10 +2,34 @@
 
 import subprocess
 import sys
+import os
 
 with open(".clang-format") as f:
     fmt = f.read()
 
+CLANG_FORMAT_BIN = os.getenv("CLANG_FORMAT_BIN")
+if CLANG_FORMAT_BIN is None:
+    p = subprocess.Popen(["clang-format", "--version"], stdout=subprocess.PIPE)
+    o, _ = p.communicate()
+    o = str(o, "utf-8")
+    o = o[len("clang-format version "):].strip()
+    o = o[:o.find(".")]
+    o = int(o)
+    if o < 7:
+        if subprocess.call(['which', 'clang-format-7'], stdout=subprocess.PIPE) == 0:
+            CLANG_FORMAT_BIN = 'clang-format-7'
+        elif subprocess.call(['which', 'clang-format-8'], stdout=subprocess.PIPE) == 0:
+            CLANG_FORMAT_BIN = 'clang-format-8'
+        elif subprocess.call(['which', 'clang-format-9'], stdout=subprocess.PIPE) == 0:
+            CLANG_FORMAT_BIN = 'clang-format-9'
+        elif subprocess.call(['which', 'clang-format-10'], stdout=subprocess.PIPE) == 0:
+            CLANG_FORMAT_BIN = 'clang-format-10'
+        else:
+            print ("clang-format 7 or above is needed. Aborted.")
+            exit(1)
+    else:
+        CLANG_FORMAT_BIN = 'clang-format'
+            
 COLUMN_LIMIT = 80
 for line in fmt.split("\n"):
     line = line.split(":")
@@ -13,7 +37,7 @@ for line in fmt.split("\n"):
         COLUMN_LIMIT = int(line[1].strip())
 
 def custom_format(filename):
-    p = subprocess.Popen(['clang-format-7', filename], stdout=subprocess.PIPE)
+    p = subprocess.Popen([CLANG_FORMAT_BIN, filename], stdout=subprocess.PIPE)
     src, _ = p.communicate()
     src = str(src, "utf-8")
 
@@ -28,7 +52,7 @@ def custom_format(filename):
                 i -= 1
             elif line.startswith("#el") and macro_indent > 0:
                 i -= 1
-            elif line.startswith("#if") and not (line.startswith("#ifndef") and line.endswith("_H")):
+            elif line.startswith("#if") and not (line.startswith("#ifndef") and (line.endswith("_H") or line.endswith("H_"))):
                 macro_indent += 1
             r = "#" + (i * "  ") + line[1:]
             if i != 0 and line.endswith("\\"):