Add Buffer::erase_range()

src/core/Buffer.cc

@@ -212,6 +212,19 @@ void Buffer::erase_code_point(const Buffer::Iterator & position)
     }
 }
 
+void Buffer::erase_range(const Buffer::Iterator & start,
+        const Buffer::Iterator & end)
+{
+    if (start.valid() && (start < end))
+    {
+        push_operation();
+        size_t start_offset = start.offset();
+        size_t end_offset = end.valid() ? end.offset() : m_gap_buffer->size();
+        erase_data(start_offset, end_offset - start_offset, true);
+        pop_operation();
+    }
+}
+
 void Buffer::erase_data(size_t offset, size_t length, bool do_record_change)
 {
     warp_iterators_before_delete(offset, length);

src/core/Buffer.h

@@ -131,6 +131,8 @@ public:
     bool insert_mode() const { return m_insert_mode; }
     void insert_code_point(const Buffer::Iterator & position, uint32_t code_point);
     void erase_code_point(const Buffer::Iterator & position);
+    void erase_range(const Buffer::Iterator & start,
+            const Buffer::Iterator & end);
     std::shared_ptr<std::string> filename() const { return m_filename; }
     Iterator begin() const { return Iterator(this); }
     Iterator end() const { return *m_eof_iterator; }