From 2cfe3cae36cb9054b37a351de0d7b60a0e5bd4ca Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Thu, 30 Mar 2017 10:38:56 +0100
Subject: [PATCH] Add an InsertDelete hook

---
 README.asciidoc             | 2 ++
 doc/manpages/hooks.asciidoc | 4 ++++
 src/commands.cc             | 2 +-
 src/input_handler.cc        | 6 ++++++
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/README.asciidoc b/README.asciidoc
index 256c8146..5cf32d7d 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -1415,6 +1415,8 @@ existing hooks are:
  * `InsertKey`: A key is received in insert mode, the key is used for filtering
  * `InsertChar`: A character is inserted in insert mode, the character is used
        for filtering
+ * `InsertDelete`: A character is deleted in insert mode, the character deleted
+       by the main selection is used for filtering
  * `InsertMove`: The cursor moved (without inserting) in insert mode, the key
        that triggered the move is used for filtering
  * `WinCreate`: A window was created, the filtering text is the buffer name
diff --git a/doc/manpages/hooks.asciidoc b/doc/manpages/hooks.asciidoc
index 27639257..d88f52b9 100644
--- a/doc/manpages/hooks.asciidoc
+++ b/doc/manpages/hooks.asciidoc
@@ -68,6 +68,10 @@ Default hooks
 	a character is received in insert mode, the character is used for
 	filtering
 
+*InsertDelete*::
+	a character is deleted in insert mode, the character deleted by
+	the main selection is used for filtering
+
 *InsertMove*::
 	the cursor moved (without inserting) in insert mode, the key that
 	triggered the move is used for filtering
diff --git a/src/commands.cc b/src/commands.cc
index ec8cd6ca..2c21c78d 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -761,7 +761,7 @@ const CommandDesc remove_highlighter_cmd = {
 static constexpr auto hooks = {
     "BufCreate", "BufNewFile", "BufOpenFile", "BufClose", "BufWritePost",
     "BufWritePre", "BufOpenFifo", "BufCloseFifo", "BufReadFifo", "BufSetOption",
-    "InsertBegin", "InsertChar", "InsertEnd", "InsertIdle", "InsertKey",
+    "InsertBegin", "InsertChar", "InsertDelete", "InsertEnd", "InsertIdle", "InsertKey",
     "InsertMove", "InsertCompletionHide", "InsertCompletionShow",
     "KakBegin", "KakEnd", "FocusIn", "FocusOut", "RuntimeError",
     "NormalBegin", "NormalEnd", "NormalIdle", "NormalKey", "RawKey",
diff --git a/src/input_handler.cc b/src/input_handler.cc
index b25e4174..b9a1653c 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -1067,8 +1067,14 @@ public:
                 auto pos = sel.cursor();
                 sels.emplace_back(buffer.char_prev(pos));
             }
+            auto& main = context().selections().main();
+            String main_char = buffer.string(buffer.char_prev(main.cursor()),
+                                             main.cursor());
             if (not sels.empty())
                 SelectionList{buffer, std::move(sels)}.erase();
+
+            if (not main_char.empty())
+                context().hooks().run_hook("InsertDelete", main_char, context());
         }
         else if (key == Key::Delete)
         {