add some useful keymap in insert/command mode with switch to toggle (#240)

Co-authored-by: curtain <kaleidoscope@163.com>

lua/chadrc.lua

@@ -103,6 +103,13 @@ local M = {
             toggle_right = "<leader>v",
             toggle_bot = "<leader>h"
         },
+        unix_keymap = {
+          toggle_unix_keymap = "<leader>k",
+          forward = "<C-f>",
+          backward = "<C-b>",
+          top_of_line = "<C-a>",
+          end_of_line = "<C-e>"
+        },
         misc = {
             esc_Termmode = "jk",
             copywhole_file = "<C-a>",

lua/mappings.lua

@@ -24,6 +24,45 @@ map("v", "x", [=[ "_x ]=], opt)
  this line too ]]
 --
 
+-- toggle unix readline's keymap
+map("n", user_map.unix_keymap.toggle_unix_keymap,"<cmd>lua require 'mappings'.unix_keymap()<CR>",{nowait = true})
+
+local _cmap_containp = function (key)
+  local cmap_tab = vim.api.nvim_get_keymap("c")
+
+  for _, value in ipairs(cmap_tab) do
+    if value['lhs'] == key then
+      return true
+    end
+  end
+  return false
+end
+
+M.unix_keymap = function()
+  local m = user_map.unix_keymap
+
+  if _cmap_containp("<C-A>") then
+    vim.api.nvim_del_keymap("i", m.forward)
+    vim.api.nvim_del_keymap("i", m.backward)
+    vim.api.nvim_del_keymap("i", m.top_of_line)
+    vim.api.nvim_del_keymap("i", m.end_of_line)
+    vim.api.nvim_del_keymap("c", m.forward)
+    vim.api.nvim_del_keymap("c", m.backward)
+    vim.api.nvim_del_keymap("c", m.top_of_line)
+    vim.api.nvim_del_keymap("c", m.end_of_line)
+  else
+    map("i", m.forward, '<Right>', opt)
+    map("i", m.backward, '<Left>', opt)
+    map("i", m.top_of_line, '<ESC>^i', opt)
+    map("i", m.end_of_line, '<End>', opt)
+    vim.api.nvim_set_keymap("c", m.forward, '<Right>', {noremap = true})
+    vim.api.nvim_set_keymap("c", m.backward, '<Left>', {noremap = true})
+    vim.api.nvim_set_keymap("c", m.top_of_line, '<Home>', {noremap = true})
+    vim.api.nvim_set_keymap("c", m.end_of_line, '<End>', {noremap = true})
+  end
+end
+
+
 -- Don't copy the replaced text after pasting in visual mode
 map("v", "p", '"_dP', opt)