From ae55a1cdde7064f63b9d44a0fc79205bc68fb69a Mon Sep 17 00:00:00 2001
From: inkch <inkch@posteo.jp>
Date: Wed, 20 Aug 2025 15:02:45 +0900
Subject: [PATCH] nvim: auto undo-break

---
 dot_config/nvim/lua/core/keymaps.lua.tmpl |  2 ++
 dot_config/nvim/lua/core/options.lua.tmpl | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/dot_config/nvim/lua/core/keymaps.lua.tmpl b/dot_config/nvim/lua/core/keymaps.lua.tmpl
index bc7565a..cdcd189 100644
--- a/dot_config/nvim/lua/core/keymaps.lua.tmpl
+++ b/dot_config/nvim/lua/core/keymaps.lua.tmpl
@@ -20,3 +20,5 @@ vim.keymap.set('n', '<C-u>', '<C-u>zz')
 vim.keymap.set('n', '<C-d>', '<C-d>zz')
 vim.keymap.set('n', '<PageUp>', '<C-u>zz')
 vim.keymap.set('n', '<PageDown>', '<C-d>zz')
+
+vim.keymap.set("i", "<CR>", "<C-g>u<CR>")
diff --git a/dot_config/nvim/lua/core/options.lua.tmpl b/dot_config/nvim/lua/core/options.lua.tmpl
index 5a80fd5..0b51f53 100644
--- a/dot_config/nvim/lua/core/options.lua.tmpl
+++ b/dot_config/nvim/lua/core/options.lua.tmpl
@@ -72,3 +72,18 @@ vim.opt.foldmethod = "indent"
 vim.opt.foldenable = false
 vim.opt.foldlevel = 99
 vim.g.markdown_folding = 1 -- enable markdown folding
+
+
+-- auto undo break (insert mode)
+local function map_undobreak(chars)
+  local term = vim.api.nvim_replace_termcodes("<C-g>u", true, false, true)
+  for _, ch in ipairs(chars) do
+    vim.keymap.set("i", ch, function() return term .. ch end,
+      { expr = true, silent = true, desc = "undobreak before '" .. ch .. "'" })
+  end
+end
+
+map_undobreak({
+  ".", ",", "!", "?", ";", ":", ")", "]", "}", ">",  -- 英文系
+  "。", "、", "！", "？", "；", "：", "）", "］", "」", "』", "＞"  -- 和文系
+})