add Path::ext()

src/lib/include/jes/Path.h

@@ -15,6 +15,7 @@ namespace jes
         Path(const char * path);
         Path(const std::string & path);
         PathRef dirname();
+        PathRef ext(const std::string & new_ext);
         PathRef join(const Path & other);
         const std::string & to_s() { return m_path; }
         bool exists();

src/lib/src/Path.cc

@@ -20,6 +20,8 @@ namespace jes
 
     PathRef Path::dirname()
     {
+        if (m_path.size() == 0)
+            return new Path("");
         size_t i = m_path.size() - 1;
         while (m_path[i] == '/')
         {
@@ -42,6 +44,30 @@ namespace jes
         return new Path(std::string(m_path, 0, i + 1));
     }
 
+    PathRef Path::ext(const std::string & new_ext)
+    {
+        if (m_path.size() == 0)
+            return new Path("");
+        size_t i = m_path.size() - 1;
+        while (m_path[i] != '.')
+        {
+            if ((i == 0) || (m_path[i] == '/'))
+            {
+                i = m_path.size();
+                break;
+            }
+            i--;
+        }
+        if (new_ext[0] == '.')
+        {
+            return new Path(std::string(m_path, 0, i) + new_ext);
+        }
+        else
+        {
+            return new Path(std::string(m_path, 0, i) + "." + new_ext);
+        }
+    }
+
     PathRef Path::join(const Path & other)
     {
         if (m_path.size() > 0 && *m_path.rbegin() == '/')