todo.res

/*
Sample JS implementation of Todo CLI that you can attempt to port:
https://gist.github.com/jasim/99c7b54431c64c0502cfe6f677512a87
*/

/* Returns date with the format: 2021-02-04 */
let getToday: unit => string = %raw(`
function() {
  let date = new Date();
  return new Date(date.getTime() - (date.getTimezoneOffset() * 60000))
    .toISOString()
    .split("T")[0];
}
  `)

type fsConfig = {encoding: string, flag: string}

/* https://nodejs.org/api/fs.html#fs_fs_existssync_path */
@bs.module("fs") external existsSync: string => bool = "existsSync"

/* https://nodejs.org/api/fs.html#fs_fs_readfilesync_path_options */
@bs.module("fs")
external readFileSync: (string, fsConfig) => string = "readFileSync"

/* https://nodejs.org/api/fs.html#fs_fs_writefilesync_file_data_options */
@bs.module("fs")
external appendFileSync: (string, string, fsConfig) => unit = "appendFileSync"

@bs.module("fs")
external writeFileSync: (string, string, fsConfig) => unit = "writeFileSync"

/* https://nodejs.org/api/os.html#os_os_eol */
@bs.module("os") external eol: string = "EOL"

let encoding = "utf8"

/*
NOTE: The code below is provided just to show you how to use the
date and file functions defined above. Remove it to begin your implementation.
*/

Js.log("Hello! today is " ++ getToday())

if existsSync("todo.txt") {
  Js.log("Todo file exists.")
} else {
  writeFileSync("todo.txt", "This is todo!" ++ eol, {encoding: encoding, flag: "w"})
  Js.log("Todo file created.")
}


let TODO_FILE = 'todo.txt'
let DONE_FILE = 'done.txt'


let HELP_TEXT = `Usage :-
$ ./todo add "todo item"  # Add a new todo
$ ./todo ls               # Show remaining todos
$ ./todo del NUMBER       # Delete a todo
$ ./todo done NUMBER      # Complete a todo
$ ./todo help             # Show usage
$ ./todo report           # Statistics`

type command =
  | Help
  | Ls
  | Add(option<string>)
  | Del(option<int>)
  | Done(option<int>)
  | Report