add PieceTable::append_initial_line_piece()

src/core/Buffer.cc

@@ -56,14 +56,8 @@ bool Buffer::load_from_file(const char * filename)
     m_piece_table = std::make_shared<PieceTable>(m_file_buffer, m_file_buffer_size);
     for (auto it = text_loader.begin(); it != text_loader.end(); it++)
     {
-        PieceTable::PieceDescriptor * pd = m_piece_table->add_piece_descriptor();
-        pd->prev = m_piece_table->end_descriptor->prev;
-        pd->next = m_piece_table->end_descriptor;
-        pd->start = it->first;
-        pd->length = it->second;
-        pd->n_chars = it->second | PIECE_DESCRIPTOR_N_CHARS_EOL_FLAG_MASK; /* TODO: fix this for other encodings */
-        m_piece_table->end_descriptor->prev->next = pd;
-        m_piece_table->end_descriptor->prev = pd;
+        /* TODO: correctly calculate n_chars based on current file encoding. */
+        m_piece_table->append_initial_line_piece(it->first, it->second, it->second);
     }
 
     return true;

src/core/PieceTable.cc

@@ -10,3 +10,16 @@ PieceTable::PieceTable(const uint8_t * file_buffer, unsigned long file_buffer_si
     end_descriptor->prev = start_descriptor;
     m_piece_descriptor_index = 2u;
 }
+
+void PieceTable::append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars)
+{
+    PieceDescriptor * pd = add_piece_descriptor();
+    pd->prev = end_descriptor->prev;
+    pd->next = end_descriptor;
+    pd->start = start;
+    pd->length = length;
+    pd->n_chars = n_chars | PIECE_DESCRIPTOR_N_CHARS_EOL_FLAG_MASK;
+    end_descriptor->prev->next = pd;
+    end_descriptor->prev = pd;
+    m_num_lines++;
+}

src/core/PieceTable.h

@@ -63,12 +63,17 @@ public:
         return m_piece_descriptors[index];
     }
 
+    uint32_t get_num_lines() { return m_num_lines; }
+
     PieceDescriptor * start_descriptor;
     PieceDescriptor * end_descriptor;
 
+    void append_initial_line_piece(uint8_t * start, uint32_t length, uint32_t n_chars);
+
 protected:
     const uint8_t * m_file_buffer;
     unsigned long m_file_buffer_size;
+    uint32_t m_num_lines;
 
     /** Next available piece descriptor index. */
     uint32_t m_piece_descriptor_index;