added moved code for shortpath

git-svn-id: svn://localhost/ardour2/trunk@1671 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/pbd/pbd/shortpath.h

@@ -0,0 +1,8 @@
+#ifndef __pbd_shortpath_h__
+#define __pbd_shortpath_h__
+
+#include <glibmm/ustring.h>
+
+Glib::ustring short_path (const Glib::ustring& path, Glib::ustring::size_type target_characters);
+
+#endif /* __pbd_shortpath_h__ */

libs/pbd/shortpath.cc

@@ -0,0 +1,56 @@
+#include <pbd/shortpath.h>
+
+using namespace Glib;
+using namespace std;
+
+ustring
+short_path (const Glib::ustring& path, ustring::size_type target_characters)
+{
+	ustring::size_type last_sep;
+	ustring::size_type len = path.length();
+	const char separator = '/';
+
+	if (len <= target_characters) {
+		return path;
+	}
+
+	if ((last_sep = path.find_last_of (separator)) == ustring::npos) {
+
+		/* just a filename, but its too long anyway */
+
+		if (target_characters > 3) {
+			return path.substr (0, target_characters - 3) + ustring ("...");
+		} else {
+			/* stupid caller, just hand back the whole thing */
+			return path;
+		}
+	}
+
+	if (len - last_sep >= target_characters) {
+
+		/* even the filename itself is too long */
+
+		if (target_characters > 3) {
+			return path.substr (last_sep+1, target_characters - 3) + ustring ("...");
+		} else {
+			/* stupid caller, just hand back the whole thing */
+			return path;
+		}
+	}
+	
+	uint32_t so_far = (len - last_sep);
+	uint32_t space_for = target_characters - so_far;
+
+	if (space_for >= 3) {
+		ustring res = "...";
+		res += path.substr (last_sep - space_for);
+		return res;
+	} else {
+		/* remove part of the end */
+		ustring res = "...";
+		res += path.substr (last_sep - space_for, len - last_sep + space_for - 3);
+		res += "...";
+		return res;
+		
+	}
+}