Avoid file rewrite when contents unchanged.

1 files changed, 12 insertions, 3 deletions

diff --git a/include/HFacer.py b/include/HFacer.py
index eb5c6973b..a26aab842 100644
--- a/include/HFacer.py
+++ b/include/HFacer.py
@@ -1,4 +1,4 @@
-# HFacer.py - regenerate the Scintilla.h and SciLexer.h files from the Scintilla.iface interface 
+# HFacer.py - regenerate the Scintilla.h and SciLexer.h files from the Scintilla.iface interface
 # definition file.
 # The header files are copied to a temporary file apart from the section between a //++Autogenerated
 # comment and a //--Autogenerated comment which is generated by the printHFile and printLexHFile
@@ -45,15 +45,24 @@ def CopyWithInsertion(input, output, genfn, definition):
 			copying = 1
 			output.write(line)
 
+def contents(filename):
+	f = file(filename)
+	t = f.read()
+	f.close()
+	return t
+
 def Regenerate(filename, genfn, definition):
+	inText = contents(filename)
 	tempname = "HFacer.tmp"
 	out = open(tempname,"w")
 	hfile = open(filename)
 	CopyWithInsertion(hfile, out, genfn, definition)
 	out.close()
 	hfile.close()
-	os.unlink(filename)
-	os.rename(tempname, filename)
+	outText = contents(tempname)
+	if inText != outText:
+		os.unlink(filename)
+		os.rename(tempname, filename)
 
 f = Face.Face()
 f.ReadFromFile("Scintilla.iface")