From d7d847c8c6057aa2a4ab33b894692e74bb46a621 Mon Sep 17 00:00:00 2001
From: Ali Mohammad Pur <ali.mpfard@gmail.com>
Date: Sun, 6 Mar 2022 12:58:45 +0330
Subject: [PATCH] LibLine: Allow the embedder to optionally handle pasted data
 itself

If the 'on_paste' callback is set, LibLine will buffer the pasted data
and pass it over to the embedder to use as it pleases; in practice, this
means that the users of LibLine can now escape or otherwise handle
pasted data without the incremental codepoint-by-codepoint buildup.
---
 Userland/Libraries/LibLine/Editor.cpp | 11 ++++++++++-
 Userland/Libraries/LibLine/Editor.h   |  4 ++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibLine/Editor.cpp b/Userland/Libraries/LibLine/Editor.cpp
index 6e33d22941..847d4f5dc2 100644
--- a/Userland/Libraries/LibLine/Editor.cpp
+++ b/Userland/Libraries/LibLine/Editor.cpp
@@ -974,6 +974,12 @@ void Editor::handle_read_event()
                     }
                     if (is_in_paste && param1 == 201) {
                         m_state = InputState::Free;
+                        if (on_paste) {
+                            on_paste(Utf32View { m_paste_buffer.data(), m_paste_buffer.size() }, *this);
+                            m_paste_buffer.clear_with_capacity();
+                        }
+                        if (!m_paste_buffer.is_empty())
+                            insert(Utf32View { m_paste_buffer.data(), m_paste_buffer.size() });
                         continue;
                     }
                 }
@@ -998,7 +1004,10 @@ void Editor::handle_read_event()
                 m_state = InputState::GotEscape;
                 continue;
             }
-            insert(code_point);
+            if (on_paste)
+                m_paste_buffer.append(code_point);
+            else
+                insert(code_point);
             continue;
         case InputState::Free:
             m_previous_free_state = InputState::Free;
diff --git a/Userland/Libraries/LibLine/Editor.h b/Userland/Libraries/LibLine/Editor.h
index 446585fe3d..5215505a4e 100644
--- a/Userland/Libraries/LibLine/Editor.h
+++ b/Userland/Libraries/LibLine/Editor.h
@@ -163,6 +163,7 @@ public:
     static StringMetrics actual_rendered_string_metrics(Utf32View const&);
 
     Function<Vector<CompletionSuggestion>(Editor const&)> on_tab_complete;
+    Function<void(Utf32View, Editor&)> on_paste;
     Function<void()> on_interrupt_handled;
     Function<void(Editor&)> on_display_refresh;
 
@@ -316,6 +317,7 @@ private:
         m_chars_touched_in_the_middle = 0;
         m_drawn_end_of_line_offset = 0;
         m_drawn_spans = {};
+        m_paste_buffer.clear_with_capacity();
     }
 
     void refresh_display();
@@ -491,6 +493,8 @@ private:
 
     RefPtr<Core::Notifier> m_notifier;
 
+    Vector<u32> m_paste_buffer;
+
     bool m_initialized { false };
     bool m_refresh_needed { false };
     Vector<int, 2> m_signal_handlers;