From cadd5bac3627305fa1fc803ddcb876d1a1a2db32 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Mon, 26 Dec 2016 08:56:36 -0500
Subject: [PATCH] Warp all cursors at/after the insert point when inserting a
 code point

---
 src/core/Buffer.cc | 8 ++++++++
 src/core/Buffer.h  | 5 ++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/core/Buffer.cc b/src/core/Buffer.cc
index 04a66e0..71228b8 100644
--- a/src/core/Buffer.cc
+++ b/src/core/Buffer.cc
@@ -169,6 +169,14 @@ void Buffer::insert_code_point(uint32_t code_point)
         uint8_t encoded[Encoding::MAX_CODE_POINT_SIZE];
         uint8_t bytes = Encoding::encode(code_point, m_encoding, encoded);
         m_gap_buffer->insert(m_insert_position, encoded, bytes);
+        ssize_t lines = (code_point == '\n') ? 1 : 0;
+        for (auto iterator : m_iterators)
+        {
+            if (iterator->offset() >= m_insert_position)
+            {
+                iterator->warp(bytes, lines);
+            }
+        }
         m_insert_position += bytes;
     }
 }
diff --git a/src/core/Buffer.h b/src/core/Buffer.h
index a1f3720..f93e716 100644
--- a/src/core/Buffer.h
+++ b/src/core/Buffer.h
@@ -93,7 +93,9 @@ public:
 
     std::shared_ptr<Iterator> add_iterator()
     {
-        return std::make_shared<Iterator>(this);
+        std::shared_ptr<Iterator> iterator = std::make_shared<Iterator>(this);
+        m_iterators.push_back(iterator);
+        return iterator;
     }
     auto get_string() { return m_gap_buffer->get_string(); }
     size_t size() const { return m_gap_buffer->size(); }
@@ -113,6 +115,7 @@ protected:
     uint8_t m_tabstop;
     bool m_insert_mode;
     size_t m_insert_position;
+    std::list<std::shared_ptr<Iterator>> m_iterators;
 
     void common_initialization();
     bool load_from_file(const char * filename);