FLI

A library for creating command line apps in rust inspired by the like of commander.js

NOTE: Check out sample code

Changes

For stable changes check the CHANGELOG.md file

For unstable changes check the CHANGELOG.md file

use fli::Fli;

fn main(){
    let mut app : Fli = Fli::init("my app", "my app description");
    app.option("-n --name, <>", "Name to call you", |x : &Fli| {});
    app.option("-g --greet", "greeting", |x : &Fli| {
        match x.get_values("name".to_owned() /* passing (--name, -n or n) would work*/){
            Ok(value) => {
                println!("Good day {?}", value[0])
            },
            Err(_) => {},
        }
    });
    // required for the app  to work 
    app.run();
}

then run it like this

$ cargo run -- -g -n james
Good day james

Getting started

Installtion

cargo add fli

OR

[dependencies]
fli = "0.0.5"

Import

extern crate fli;
use fli::Fli;
fn main(){
    println!("Happy Coding");
}

Create an App Instance

fn main(){
    let mut app = Fli::init("app-name", "app description");
}

Adding Options

fn main(){
    let mut app = Fli::init("app-name");
    app.option("-g --greet", "to make a greeting", greet);
    app.option("-n --name, <>", "to set your name", |x|{});
}

// callback for the greet param
fn greet(x: &Fli){
    match x.get_values("--name".to_owned()){
        Ok(option) => {
            println!("Good day {?}", v[0]);
        },
        Err(_) => {},
    }
}

Run your app

fn main(){
    //... other code
    app.run();
}

Adding a new Command Set

You can also add a new command set using the command method

fn main(){
    let mut app = Fli::init("app-name", "app-description");
    app.command("greet", "An app that respects")
    .default(greet)
    .allow_inital_no_param_values(false)
    .option("-n --name, <>", "To print your name along side", greet)
    .option("-t --time, []", "For time based Greeting", greet);
    app.run();
}

fn greet(x){ /*code to greet "*/ }

Then you would run the command like this

$ cargo run -- greet -n "codad5" 
> Hello Codad5

Doing it in a procedual way

Like commander.js you can also do it in a procedual way

use fli::Fli;

fn main(){
    //  doing it procedual way
    let mut app = Fli::init("app-name", "app descripton");
    let moveCommand = app.command("move", "move files");
    // the [...] means accept optional multiple
    moveCommand.option("-p --path, <...>", "path to files to be moved", move_file);
    app.option("-g --greet",  "to make a greeting", |x|{});
    app.option("-n --name, <>", "to set your name", |x|{});
    app.run();

    if app.is_passed("--greet"){
        if app.has_a_value("-n"){/* greet person with name*/}
        else { /* freet without name*/ }
    }
}

Explaining all app : Fli methods

Note:

All app : Fli methods are avaliable as app : &Fli methods

• app.option(arg_and_data, callback) : This method takes in 2 param

  • First arg_and_data : This is a format template of how the avaliable arguments for a command would be being in a format -a --arg or -a --arg, data where -a is the short form of the argument and --arg is the long form of the argument. --data is the acceptable data type and it is seperated by a comma , , if not passed then the arg does not need a data type

  symbol	meaning
  []	This means it needs one optional data
  <>	This means it needs one required data
  [...]	This means it can take in many optional data
  <...>	This means it needs at least one data, can take more

• app.commad(command_name) : This is to create a new command with its own option and param like

• app.default(callback) : The default callback incase no args or command is being passed but a no_param_value is being passed

• app.allow_duplicate_callback(bool) : To prevent duplicate callbacks as a result of same callback of an arg or as a result of the arg been passed multiple times

  • True : Turns it on i.e the code below would work fine

  $ myapp "some ran value"

• app.allow_inital_no_param_values(bool) : This is to allow values to a command with no params

• app.run() (!important) : To run the app ,

• app.has_a_value(arg_flag) : Check if an arg has a value

• app.get_values(arg_flag) : get the value(s) of an expect required param, this returns a Result Type with a vector of string as the Ok value Vec<String> and &str as the error value

NOTE the method get_values would return the Err Enum if the arg does not expect or require a value

• app.is_passed(bool) : Check if an arg flag is passed.

NOTE : using the methods has_a_value, get_values and is_passed you can pass -n , --name , n , name and they would all return same expected value

• app.get_arg_at(u8) : Get Arg at a specific position

NOTE : The runner is not included as part of the arg list . ie if a command like this my-app > greet > hello exist the position 1 for the command greet is greet and not my-app

• app.print_help(message) : Prints a well descriptive message.

Printing default help thisGet the app general help option

$ my-app --help

Get the move command help option

$ my-app move --help # a new command called