add PieceTable::Cursor::operator*(), add unit test

src/core/PieceTable.h

@@ -63,6 +63,12 @@ public:
 
         /** Virtual column (0 based). */
         uint32_t column;
+
+        uint32_t operator*() const
+        {
+            /* TODO: Use Encoding */
+            return piece->start[offset];
+        }
     };
 
     PieceTable(const uint8_t * file_buffer, unsigned long file_buffer_size);

test/src/test_Buffer.cc

@@ -21,3 +21,11 @@ TEST(BufferTest, writes_an_identical_file_to_what_is_loaded_if_no_changes_were_p
         TestSupport::compare_files(e, "test/tmp/f");
     }
 }
+
+TEST(BufferTest, allows_navigating_using_cursors)
+{
+    Buffer b;
+    ASSERT_TRUE(b.load_from_file("test/files/line_endings/lf_format.txt"));
+    std::shared_ptr<PieceTable::Cursor> cursor = b.piece_table->add_cursor();
+    EXPECT_EQ((uint32_t)'H', **cursor);
+}