Fix bug 3220

* src/insets/ExternalSupport.C
	(updateExternal): Avoid computing crc of a directory as this leads
	to a crash on Cygwin.

	* lib/configure.py:
	Use a python script to get the current date in order to avoid
	a stalling condition with the date command on Win32.

	* lib/scripts/date.py:
	New python script.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@17168 a592a061-630c-0410-9148-cb99ea01b6c8

lib/configure.py

@@ -451,7 +451,7 @@ def checkConverterEntries():
     #
     # Entried that do not need checkProg
     addToRC(r'''\converter lyxpreview ppm        "python -tt $$s/scripts/lyxpreview2bitmap.py"	""
-\converter date       dateout    "date +%d-%m-%Y > $$o"	""
+\converter date       dateout    "python -tt $$s/scripts/date.py %d-%m-%Y > $$o"	""
 \converter docbook    docbook-xml "cp $$i $$o"	"xml"
 \converter fen        asciichess "python -tt $$s/scripts/fen2ascii.py $$i $$o"	""
 \converter fig        pdftex     "python -tt $$s/scripts/fig2pdftex.py $$i $$o"	""

lib/scripts/date.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# file date.py
+# This file is part of LyX, the document processor.
+# Licence details can be found in the file COPYING.
+
+# \author Enrico Forestieri
+
+# Full author contact details are available in file CREDITS.
+
+# Print the system date and time in the given format. See the python
+# documentation for available formats (mostly the same as the POSIX std).
+# This file is provided because the date command on Windows is not
+# POSIX compliant.
+
+import sys
+from time import strftime
+
+def main(argv):
+    if len(argv) > 2:
+        sys.stderr.write('Usage: python date.py [<format>]\n')
+        sys.exit(1)
+
+    if len(argv) == 2:
+        format = argv[1]
+    else:
+        format = "%d-%m-%Y"
+
+    print strftime(format)
+
+if __name__ == "__main__":
+    main(sys.argv)

src/insets/ExternalSupport.C

@@ -31,10 +31,14 @@
 #include "support/os.h"
 #include "support/package.h"
 
+#include <boost/filesystem/operations.hpp>
+
 using std::endl;
 using std::string;
 using std::vector;
 
+using boost::filesystem::is_directory;
+
 
 namespace lyx {
 
@@ -247,7 +251,7 @@ void updateExternal(InsetExternalParams const & params,
 	FileName const temp_file(
 		support::makeAbsPath(params.filename.mangledFilename(),
 				     m_buffer->temppath()));
-	if (!params.filename.empty()) {
+	if (!params.filename.empty() && !is_directory(params.filename.toFilesystemEncoding())) {
 		unsigned long const from_checksum = support::sum(params.filename);
 		unsigned long const temp_checksum = support::sum(temp_file);