DisplayBuffer: add a split method to split an atom

1 files changed, 15 insertions, 0 deletions

diff --git a/src/display_buffer.cc b/src/display_buffer.cc
index ea5342bc..03cc5b18 100644
--- a/src/display_buffer.cc
+++ b/src/display_buffer.cc
@@ -1,5 +1,7 @@
 #include "display_buffer.hh"
 
+#include "assert.h"
+
 namespace Kakoune
 {
 
@@ -7,4 +9,17 @@ DisplayBuffer::DisplayBuffer()
 {
 }
 
+DisplayBuffer::iterator DisplayBuffer::split(iterator atom, size_t pos_in_atom)
+{
+    assert(atom < end());
+    assert(pos_in_atom < atom->content.length());
+    DisplayAtom new_atom(atom->begin, atom->begin + pos_in_atom,
+                         atom->content.substr(0, pos_in_atom),
+                         atom->fg_color, atom->bg_color, atom->attribute);
+
+    atom->begin = atom->begin + pos_in_atom;
+    atom->content = atom->content.substr(pos_in_atom);
+    return insert(atom, std::move(new_atom));
+}
+
 }