PS C:\Users\sakai> cd $home
PS C:\Users\sakai> ls .vimrc

    Directory: C:\Users\sakai

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a---           7/08/2023  5:13 AM             86 .vimrc

PS C:\Users\sakai>

PS C:\Users\sakai\AppData\Local\nvim> ls

    Directory: C:\Users\sakai\AppData\Local\nvim

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a---          22/08/2023  8:14 PM             12 init.vim

PS C:\Users\sakai\AppData\Local\nvim> type .\init.vim
source ~\.vimrc

syntax on
set noerrorbells
set number
" indent setting
set expandtab
set tabstop=2 softtabstop=2
set shiftwidth=2
set smartindent

PS C:\Users\sakai\.config\nvim> nvim -version
NVIM v0.7.2
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compiled by runneradmin@fv-az276-503

Features: -acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM\sysinit.vim"
  fall-back for $VIM: "C:/Program Files/nvim/share/nvim"

Run :checkhealth for more info
PS C:\Users\sakai\.config\nvim>
PS C:\Users\sakai\.config\nvim> nvim +Tutor

require('base')
require('options')

local options = {
	encoding = "utf-8",
	fileencoding = "utf-8",
	title = true,
	backup = false,
	clipboard = "unnamedplus",
	cmdheight = 2,
	completeopt = { "menuone", "noselect" },
	conceallevel = 0,
	hlsearch = true,
	ignorecase = true,
	mouse = "a",
	pumheight = 10,
	showmode = false,
	showtabline = 2,
	smartcase = true,
	smartindent = true,
	swapfile = false,
	termguicolors = true,
	timeoutlen = 300,
	undofile = true,
	updatetime = 300,
	writebackup = false,
	shell = "fish",
	backupskip = { "/tmp/*", "/private/tmp/*" },
	expandtab = true,
	shiftwidth = 2,
	tabstop = 2,
	cursorline = true,
	number = true,
	relativenumber = false,
	numberwidth = 4,
	signcolumn = "yes",
	wrap = false,
	winblend = 0,
	wildoptions = "pum",
	pumblend = 5,
	background = "dark",
	scrolloff = 8,
	sidescrolloff = 8,
	guifont = "monospace:h17",
	splitbelow = false, 
	splitright = false, 
}

for k, v in pairs(options) do 
  vim.opt[k] = v
end

--[[
01_hello.lua
--]]
-- -------------------------- local functions
function getMessage(name)
  local str = 'Hello, '
  return str .. name .. " !!"
end


-- --------------------------- Entry point
print 'Hello, world!'

-- call a function
local msg = getMessage("Lua")
print(msg)

io.write("Hello, world, from ", _VERSION, "!!\n")

-- number
local f = 70.0/3.0
print("value of f", f)

print(type(msg))
print(type(f))
print(type({}))

print("message:", msg)
print("Length :", #msg)

--[[
05_table.lua
--]]
-- -------------------------- local functions
loopIndexTable = function(ary)
  for k,v in ipairs(ary)
  do
    print(k, v)
  end
end

loopTable = function(ary)
  for k,v in pairs(ary)
  do
    print(k, v)
  end
end


-- --------------------------- Entry point
local ary = {"lua", "lui", "luu", "lue", "luo"}

loopIndexTable(ary)

-- local hash = { 1 = "lua", 2 = "lui" }
-- local hash = { "lua" = "Lua", "lui" = "Lui" }
local hash = { lua = "Lua", lui = "Lui" }
local hash2 = { [1] = "Lua", [2] = "Lui" }
local hash3 = { ["lua"] = "Lua3", ["lui"] = "Lui3" }
local hash4 = {
  lua = "Lua4",
  lui = "Lui4",
  luu = "Luu4",
}

print(hash["lui"])
print(hash2[1])
-- print(hash3["lua"])
-- print(hash4["luu"])
-- print(ary[5])
print(type(hash4))
loopTable(hash4)

 string.byte - Converts a character into its ASCII (decimal) equivalent
 string.char - Converts ASCII codes into their equivalent characters
 string.dump - Converts a function into binary
 string.find - Searches a string for a pattern
 string.format - Formats a string
 string.gfind - Iterate over a string (obsolete in Lua 5.1)
 string.gmatch - Iterate over a string
 string.gsub - Substitute strings inside another string
 string.len - Return the length of a string
 string.lower - Converts a string to lower-case
 string.match - Searches a string for a pattern
 string.rep - Returns repeated copies of a string
 string.reverse - Reverses the order of characters in a string
 string.sub - Returns a substring of a string
 string.upper - Converts a string to upper-case

--[[
04_string.lua
--]]
-- -------------------------- local functions
convertTitle = function(str)
  ret = ""
  -- start = string.upper(string.char(string.byte(str, 1)))
  start = string.sub(string.upper(str),1, 1)
  temp = string.sub(string.lower(str),2, #str)
  ret = start .. temp
  return ret
end


-- --------------------------- Entry point
local title = convertTitle("memm-MeMoRu")
print(title)

print(string.char(string.byte("Lua")))

---
string = "Lua Tutorial Tutorial"

-- replacing strings
newstring = string.gsub(string,"Tutorial","Language")
print("The new string is "..newstring)

msg = string.format("%s, %s !!", "hello", "world")
print(msg)

d = 5; m = 1; y = 2021
date = string.format("%02d/%02d/%04d",d,m,y)
print(date)

str = [[
Hello, %s !!
Hello, %s !!!
]]

msg = string.format(str, "lua", "Neovim")
print(msg)

 assert -- Asserts that condition is not nil and not false
 collectgarbage -- Collects garbage
 dofile -- Executes a Lua file
 error -- Raises an error message
 gcinfo -- Returns amount of dynamic memory in use
 getfenv -- Returns the current environment table
 getmetatable -- Returns the metatable for the object
 ipairs -- Iterates over a numerically keyed table
 load -- Loads a chunk by calling a function repeatedly
 loadfile -- Loads a Lua file and parses it
 loadlib -- Loads a DLL (obsolete in Lua 5.1)
 loadstring -- Compiles a string of Lua code
 module -- Creates a Lua module
 next -- Returns next key / value pair in a table
 pairs -- Traverse all items in a table
 pcall -- Calls a function in protected mode
 print -- Prints its arguments
 rawequal -- Compares two values for equality without invoking metamethods
 rawget -- Gets the value of a table item without invoking metamethods
 rawset -- Sets the value of a table item without invoking metamethods
 require -- Loads a module
 select -- Returns items in a list
 setfenv -- Sets a function's environment
 setmetatable -- Sets the metatable for a table
 tonumber -- Converts a string (of the given base) to a number
 tostring -- Converts its argument to a string
 type -- Returns the type of a variable
 unpack -- Unpacks a table into individual items
 xpcall -- Calls a function with a custom error handler