add FileLoader::get_line()

src/core/FileLoader.cc

@@ -95,3 +95,14 @@ void FileLoader::load_buf(size_t size)
         m_lines = lines[LINE_ENDING_LF];
     }
 }
+
+std::shared_ptr<Text> FileLoader::get_line(size_t index)
+{
+    if (index > num_lines())
+    {
+        return NULL;
+    }
+
+    const LineIndexPair & line_index_pair = (*m_lines)[index];
+    return std::make_shared<Text>(line_index_pair.first, line_index_pair.second);
+}

src/core/FileLoader.h

@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <vector>
 #include <memory>
+#include "Text.h"
 
 class FileLoader
 {
@@ -19,7 +20,7 @@ public:
     FileLoader();
     ~FileLoader();
     bool load(const char * fname);
-    unsigned int num_lines()
+    size_t num_lines()
     {
         if (m_lines == NULL)
         {
@@ -31,6 +32,7 @@ public:
         }
     }
     int get_line_endings() { return m_line_endings; }
+    std::shared_ptr<Text> get_line(size_t index);
 protected:
     typedef std::pair<const uint8_t *, size_t> LineIndexPair;
     typedef std::vector<LineIndexPair> LineIndexPairVector;