From e8b2093821553a9a338f5a6c570a687934dffe70 Mon Sep 17 00:00:00 2001
From: bhagwan <bhagwan@disroot.org>
Date: Sat, 16 Mar 2024 10:37:43 -0700
Subject: [PATCH] feat: better INSERT mode detection (#1088)

---
 lua/fzf-lua/actions.lua | 26 --------------------------
 lua/fzf-lua/fzf.lua     | 28 +++++++++-------------------
 lua/fzf-lua/utils.lua   |  1 +
 3 files changed, 10 insertions(+), 45 deletions(-)

diff --git a/lua/fzf-lua/actions.lua b/lua/fzf-lua/actions.lua
index 373097f3..4bb9288b 100644
--- a/lua/fzf-lua/actions.lua
+++ b/lua/fzf-lua/actions.lua
@@ -429,32 +429,6 @@ M.toggle_bg = function(_, _)
   utils.info(string.format([[background set to "%s"]], vim.o.background))
 end
 
-M.ensure_insert_mode = function()
-  -- not sure what is causing this, tested with
-  -- 'NVIM v0.6.0-dev+575-g2ef9d2a66'
-  -- vim.cmd("startinsert") doesn't start INSERT mode
-  -- 'mode' returns { blocking = false, mode = "t" }
-  -- manually input 'i' seems to workaround this issue
-  -- **only if fzf term window was succefully opened (#235)
-  -- this is only required after the 'nt' (normal-terminal)
-  -- mode was introduced along with the 'ModeChanged' event
-  -- https://github.com/neovim/neovim/pull/15878
-  -- https://github.com/neovim/neovim/pull/15840
-  -- local has_mode_nt = not vim.tbl_isempty(
-  --   vim.fn.getcompletion('ModeChanged', 'event'))
-  --   or vim.fn.has('nvim-0.6') == 1
-  -- if has_mode_nt then
-  --   local mode = vim.api.nvim_get_mode()
-  --   local wininfo = vim.fn.getwininfo(vim.api.nvim_get_current_win())[1]
-  --   if vim.bo.ft == 'fzf'
-  --     and wininfo.terminal == 1
-  --     and mode and mode.mode == 't' then
-  --     vim.cmd[[noautocmd lua vim.api.nvim_feedkeys('i', 'n', true)]]
-  --   end
-  -- end
-  utils.warn("calling 'ensure_insert_mode' is no longer required and can be safely omitted.")
-end
-
 M.run_builtin = function(selected)
   local method = selected[1]
   pcall(loadstring(string.format("require'fzf-lua'.%s()", method)))
diff --git a/lua/fzf-lua/fzf.lua b/lua/fzf-lua/fzf.lua
index f9515edc..3a5cfc85 100644
--- a/lua/fzf-lua/fzf.lua
+++ b/lua/fzf-lua/fzf.lua
@@ -294,26 +294,16 @@ function M.raw_fzf(contents, fzf_cli_args, opts)
   if not opts.is_fzf_tmux then
     vim.cmd [[set ft=fzf]]
 
-    -- terminal behavior seems to have changed after the introduction
-    -- of 'nt' mode (terminal-normal mode) which is included in 0.6
     -- https://github.com/neovim/neovim/pull/15878
-    -- Preferably I'd like to check if the vim patch is included using
-    --   vim.fn.has('patch-8.2.3461')
-    -- but this doesn't work for vim patches > 8.1 as explained in:
-    -- https://github.com/neovim/neovim/issues/9635
-    -- However, since this patch was included in 0.6 we can test
-    -- for neovim version 0.6
-    -- Beats me why 'nvim_get_mode().mode' still returns 'nt' even
-    -- after we're clearly in insert mode or why `:startinsert`
-    -- won't change the mode from 'nt' to 't' so we use feedkeys()
-    -- instead.
-    -- This "retires" 'actions.ensure_insert_mode' and solves the
-    -- issue of calling an fzf-lua mapping from insert mode (#429)
-
-    if vim.fn.has("nvim-0.6") == 1 and vim.api.nvim_get_mode().mode ~= "i" then
-      vim.cmd([[noautocmd lua vim.api.nvim_feedkeys(]]
-        .. [[vim.api.nvim_replace_termcodes("<Esc>i", true, false, true)]]
-        .. [[, 'n', true)]])
+    -- Since patch-8.2.3461 which was released with 0.6 neovim distinguishes between
+    -- Normal mode and Terminal-Normal mode. However, this seems to have also introduced
+    -- a bug with `startinsert`: When fzf-lua reuses interfaces (e.g. called from "builtin"
+    -- or grep<->live_grep toggle) the current mode will be "t" which is Terminal (INSERT)
+    -- mode but our interface is still opened in NORMAL mode, either `startinsert` is not
+    -- working (as it's technically already in INSERT) or creating a new terminal buffer
+    -- within the same window starts in NORMAL mode while returning the wrong `nvim_get_mode
+    if utils.__HAS_NVIM_06 and vim.api.nvim_get_mode().mode == "t" then
+      utils.feed_keys_termcodes("i")
     else
       vim.cmd [[startinsert]]
     end
diff --git a/lua/fzf-lua/utils.lua b/lua/fzf-lua/utils.lua
index 68160bb5..7d2349f9 100644
--- a/lua/fzf-lua/utils.lua
+++ b/lua/fzf-lua/utils.lua
@@ -8,6 +8,7 @@ end
 
 local M = {}
 
+M.__HAS_NVIM_06 = vim.fn.has("nvim-0.6") == 1
 M.__HAS_NVIM_07 = vim.fn.has("nvim-0.7") == 1
 M.__HAS_NVIM_08 = vim.fn.has("nvim-0.8") == 1
 M.__HAS_NVIM_09 = vim.fn.has("nvim-0.9") == 1