Lua-System docs

## password_input.lua

    local sys = require "system"

    print [[

    This example shows how to disable the "echo" of characters read to the console,
    useful for reading secrets from the user.

    ]]

    --- Function to read from stdin without echoing the input (for secrets etc).
    -- It will (in a platform agnostic way) disable echo on the terminal, read the
    -- input, and then re-enable echo.
    -- @param ... Arguments to pass to io.stdin:read()
    -- @return the results of io.stdin:read(...)
    local function read_secret(...)
      local w_oldflags, p_oldflags

      if sys.isatty(io.stdin) then
        -- backup settings, configure echo flags
        w_oldflags = sys.getconsoleflags(io.stdin)
        p_oldflags = sys.tcgetattr(io.stdin)
        -- set echo off to not show password on screen
        assert(sys.setconsoleflags(io.stdin, w_oldflags - sys.CIF_ECHO_INPUT))
        assert(sys.tcsetattr(io.stdin, sys.TCSANOW, { lflag = p_oldflags.lflag - sys.L_ECHO }))
      end

      local secret, err = io.stdin:read(...)

      -- restore settings
      if sys.isatty(io.stdin) then
        io.stdout:write("\n")  -- Add newline after reading the password
        sys.setconsoleflags(io.stdin, w_oldflags)
        sys.tcsetattr(io.stdin, sys.TCSANOW, p_oldflags)
      end

      return secret, err
    end

    -- Get username
    io.write("Username: ")
    local username = io.stdin:read("*l")

    -- Get the secret
    io.write("Password: ")
    local password = read_secret("*l")

    -- Get domainname
    io.write("Domain  : ")
    local domain = io.stdin:read("*l")

    -- Print the results
    print("")
    print("Here's what we got:")
    print("  username: " .. username)
    print("  password: " .. password)
    print("  domain  : " .. domain)

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