Make optional whether go_right() allows going to EOL

src/core/GapBuffer.cc

@@ -101,6 +101,24 @@ bool GapBuffer::Cursor::is_start_of_line()
     return *i2 == '\n';
 }
 
+bool GapBuffer::Cursor::is_end_of_line(bool allow_eol)
+{
+    if (*m_iterator == '\n')
+    {
+        return true;
+    }
+    if (!allow_eol)
+    {
+        Iterator i2 = m_iterator;
+        i2.go_forward();
+        if (*i2 == '\n')
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
 bool GapBuffer::Cursor::go_start_of_line()
 {
     bool moved = false;
@@ -128,11 +146,11 @@ bool GapBuffer::Cursor::go_start_of_line()
 bool GapBuffer::Cursor::go_end_of_line()
 {
     bool moved = false;
-    if (go_right())
+    if (go_right(false))
     {
         moved = true;
     }
-    while (go_right())
+    while (go_right(false))
     {
         ;
     }
@@ -161,9 +179,9 @@ bool GapBuffer::Cursor::go_left()
     return false;
 }
 
-bool GapBuffer::Cursor::go_right()
+bool GapBuffer::Cursor::go_right(bool allow_eol)
 {
-    if (!is_end_of_line())
+    if (!is_end_of_line(allow_eol))
     {
         if (m_iterator.check_go_forward())
         {
@@ -231,7 +249,7 @@ void GapBuffer::Cursor::calculate_column()
     tmp_cursor.go_start_of_line();
     while (tmp_cursor < *this)
     {
-        tmp_cursor.go_right();
+        tmp_cursor.go_right(true);
     }
     m_column = tmp_cursor.m_column;
 }
@@ -241,7 +259,7 @@ void GapBuffer::Cursor::forward_to_column(size_t target_column)
     int32_t diff = abs((int32_t)(target_column - m_column));
     if (diff == 0)
         return;
-    while (go_right())
+    while (go_right(false))
     {
         int32_t new_diff = abs((int32_t)(target_column - m_column));
         if (new_diff > diff)

src/core/GapBuffer.h

@@ -62,14 +62,11 @@ public:
             init_column();
         }
         bool is_start_of_line();
-        bool is_end_of_line()
-        {
-            return *m_iterator == '\n';
-        }
+        bool is_end_of_line(bool allow_eol);
         bool go_start_of_line();
         bool go_end_of_line();
         bool go_left();
-        bool go_right();
+        bool go_right(bool allow_eol);
         bool go_up(size_t target_column);
         bool go_down(size_t target_column);
         bool operator<(const Cursor & other)