RustyDumbTools (v0.1.13)

A collection of simple tools in Rust as Rust modules:

crate::arg::DumbArgParser: A simple argument parser. It can be useful for handling command line argument parsing for a Rust program.
crate::calc::DumbCalcProcessor: A simple infix calculation processor It can be used to implement a simple calculator in Rust.
crate::calculator::DumbCalculator: A simple calculator that accepts input keys acting like a real calculator. It can be used to implement a simple calculator UI in Rust.
crate::ltemp::DumbLineTemplate: A simple line template for formatting a line. It can be usee for printing values as a line with some template.
crate::lblscreen::DumbLineByLineScreen: A terminal / text-based "screen" update helper. It is extended from crate::ltemp::DumbLineTemplate, and should be helpful in managing the updates of the formatted lines that acts as a "screen".
crate::json::DumbJsonProcessor: A simple JSON processor / stream parser, that processes input JSON (possibly streamed piece by piece). Instead of returning the parsed JSON as some object; as soon as JSON entries are recognized, the configured callback is called for those recognized JSON entries.

Sample Code for `DumbArgParser`

pub fn arg_parser_sample(provide_sample_args: bool) {
    let mut parser = DumbArgParser::new();
    parser.set_description("This is a simple argument parser.");
    dap_arg!("-v", flag2 = "--verbose", fixed = true).add_to(&mut parser); // argument flag "-v" / "--verbose" with fixed value (true) when the flag is present
    dap_arg!("-n", flag2 = "--name", default = "nobody").add_to(&mut parser); // argument "-n" / "--name" requiring input value, with default "nobody"
    dap_arg!("str-arg").add_to(&mut parser); // positional argument "str-arg" (of type String)
    dap_arg!("i32-arg", value = 123).add_to(&mut parser); // positional argument "i32-arg" of type i32 (inferred from the value 123)
    dap_arg!("multi-arg").set_multi().add_to(&mut parser); // positional multi-argument "multi-arg" that will accept multiple values (one + rest)
    if provide_sample_args {
        let in_args: Vec<&str> = vec!["-v", "STR", "888", "m1", "m2", "m3"]; // explicitly provide arguments
        parser.process_args(in_args); // parse from command-line arguments
    } else {
        parser.parse_args(); // parse from command-line arguments
    }
    println!(". -v: {:?}", parser.get::<bool>("-v"));
    println!(". --verbose: {:?}", parser.get::<bool>("--verbose")); // will be the same parameter value as "-v"
    println!(". --name: {:?}", parser.get::<String>("--name")); // can use "-n" as well
    println!(". str-arg: {:?}", parser.get::<String>("str-arg"));
    println!(". i32-arg: {:?}", parser.get::<i32>("i32-arg"));
    println!(". multi-arg: {:?}", parser.get_multi::<String>("multi-arg"));
}

If run with provide_sample_args set to true, i.e. no arguments provided, output will be like

| !!!
| !!! INVALID INPUT ARGUMENT: argument [str-arg] not provided
| !!!
| USAGE: rusty_dumb_tools [-h] [-v] [-n name] <str-arg> <i32-arg> <multi-arg>
| : This is a simple argument parser.
| . -h, --help : HELP
| . -v, --verbose : FLAG [true]
| . -n name, --name name : OPTIONAL; default [nobody]
| . <str-arg> : REQUIRED; e.g.
| . <i32-arg> : REQUIRED; e.g. 123
| . <multi-arg> ... : REQUIRED; e.g.  ...

If run with provide_sample_args set to false, output will be like

. -v: Some(true)
. --verbose: Some(true)
. --name: Some("nobody")
. str-arg: Some("STR")
. i32-arg: Some(888)
. multi-arg: Some(["m1", "m2", "m3"])

Next section will present a demo of using the tools. The sub-demo "selection" is actually implemented using DumbArgParser with "sub-selection" for the selected sub-demo like

pub fn run_demo() {
    let mut parser = create_demo_parser();
    parser.parse_args();
    handle_sub_demo(parser);
}
pub fn create_demo_parser() -> DumbArgParser {
    let mut parser = DumbArgParser::new();
    parser.set_description("Demos of rusty_dumb_tools.");
    dap_arg!("demo", value = "calc")
        .set_description("a demo")
        .set_with_desc_enums(vec![
            "calc:DumbCalcProcessor command-line input demo",
            ...
        ])
        .set_rest()
        .add_to(&mut parser)
        .unwrap();
    parser
}
pub fn handle_sub_demo(parser: DumbArgParser) {
    let demo = match parser.get::<String>("demo") {
        Some(t) => t,
        None => {
            panic!("No demo specified.");
        }
    };
    match demo.as_str() {
        "calc" => {
            let mut demo_parser = create_demo_calc_parser();
            parser.process_rest_args("demo", &mut demo_parser);
            handle_demo_calc(demo_parser);
        }
        ...
        _ => panic!("Unknown sub-demo: {}", demo),
    };
}
fn create_demo_calc_parser() -> DumbArgParser {
    let mut parser = DumbArgParser::new();
    parser.set_description("DumbCalcProcessor command-line input demo.");
    dap_arg!("input", value = "123")
        .set_multi()
        .set_description("infix expression")
        .add_to(&mut parser)
        .unwrap();
    parser
}
pub fn handle_demo_calc(parser: DumbArgParser) {
    let input = parser.get_multi::<String>("input").unwrap();
    ...
}

Demo

For a demo program of using the tools, which is itself an application using DumbArgParser, you may want to run the included demo function rusty_dumb_tools::demo::run_demo like

use rusty_dumb_tools::demo;
demo::run_demo(None);  // get arguments from command-line

Assuming new Rust project with Cargo.toml and main.rs like

Cargo.toml

...
[dependencies]
rusty_dumb_tools = "0.13"
...

main.rs

use rusty_dumb_tools::demo;
fn main() {
    demo::run_demo(None);
}

the demo can be cargo run like

cargo run -- -h the input demonstrates using DumbArgParser for showing "help message"
cargo run -- calc -h DumbArgParser is set up to parse arguments for a sub-command (with another DumbArgParser object); and the above input demonstrates showing of "help message" of the sub-command
cargo run -- calc 1.1 + 2.2 * (4.3 - 2.4) + 5 the above demonstrates how to use a [sub-command] DumbArgParser to parse arguments for the sub-command calc, which in turn will show how to use DumbCalcProcessor for performing calculation of the sub-command arguments
cargo run -- calc-repl the above demonstrates how to invoke the sub-command calc-repl, which in turn show how DumbCalcProcessor like a REPL
cargo run -- ltemp Trevor the above demonstrates how to use DumbLineTemplate to format lines to show data
cargo run -- lblscreen the above demonstrates how to use DumbLineByLineScreen to implement a "progress info panel"
cargo run -- arg -f 0.2 5 --string2 VAL1 false 1 2 3

The output of running cargo run -- -h:

| USAGE: rusty_dumb_tools [-h] <demo>
| : Demos of rusty_dumb_tools.
| . -h, --help : HELP
| . <demo> ... : REQUIRED; e.g. calc ...
|   : a demo
|   : . [calc] : DumbCalcProcessor command-line input demo
|   : . [calc-repl] : DumbCalcProcessor REPL demo
|   : . [json] : DumbJsonProcessor demo
|   : . [ltemp] : DumbLineTemplate demo
|   : . [lblscreen] : DumbLineByLineScreen demo
|   : . [arg] : DumbArgParser demo (more like debugging)

The output of running cargo run -- calc -h:

| USAGE: rusty_dumb_tools calc [-h] <input>
| : DumbCalcProcessor command-line input demo.
| . -h, --help : HELP
| . <input> ... : REQUIRED; e.g. 123 ...
|   : infix expression

The output of running cargo run -- calc 1.1 + 2.2 * (4.3 - 2.4) + 5:

|
| = 10.28.
|

After running cargo run -- calc-repl, the demo will get in a loop to get input from the prompt:

* enter an infix expression
* can split the infix expression into multiple lines; e.g. a "unit" a line
* finally, enter "=" (or an empty line) to evaluate it
* can then continue to enter another infix expression ...

>

After running cargo run -- ltemp Trevor, the demo will show something like

===============================
| NAME :               Trevor |
| AGE  :        <undisclosed> |
|      :     and counting ... |
| +  1 | #                    |
===============================

+ 1 | # acts like a "progress indicator"; after 20 seconds:

===============================
| NAME :               Trevor |
| AGE  :        <undisclosed> |
|      :     and counting ... |
| + 20 | #################### |
===============================

After running cargo run -- lblscreen, the screen will show something like

----------------------------------------
|      ... wait ... loading 0% ...     |
| ........ |                    :   0% |
----------------------------------------

after 20 seconds, when 100% done, the screen will be like

|     ... wait ... loading 100% ...    |
| ........ |>>>>>>>>>>>>>>>>>>>>: 100% |
----------------------------------------

After running cargo run -- json 'hong kong', which will query the info about universities of some country with API provided by universities.hipolabs.com, the screen will show something like

*** query universities of country: [hong kong] ...
* `name` => `Hong Kong Chu Hai College`
* `name` => `City University of Hong Kong`
* `name` => `The Chinese University of Hong Kong`
* `name` => `The Hong Kong Academy for Performing Arts`
* `name` => `Hong Kong Baptist University`
* `name` => `Hong Kong Shue Yan University`
* `name` => `The University of Hong Kong`
* `name` => `Lingnan University`
* `name` => `Hong Kong Metropolitan University`
* `name` => `The Hong Kong Polytechnic University`
* `name` => `The Hong Kong University of Science and Technology`
* `name` => `The Education University of Hong Kong`
* `name` => `The Hang Seng University of Hong Kong`
* `name` => `Canadian International School of Hong Kong`

Additional Demos

DumbCalculator Text-based Demo
DumbCalculator Web-based Demo
- you may try it:
- and may want to refer to some brief introduction on how the demo is implemented

Thank You!

Greeting from the author Trevor Lee:

Peace be with you! May God bless you! Jesus loves you! Amazing Grace!

License

MIT

Change History:

v0.1.13
- bug fix
v0.1.12
- added supply bytes to DumbJsonProcessor
- bug fix
v0.1.11
- added more functions to DumbCalculator
- bug fix
v0.1.10
- bug fix
v0.1.9
- added DumbJsonProcessor
- bug fix
v0.1.89
- bug fix
v0.1.8
- bug fix ... for DumbCalculator, 8/2(1+3) now is 1 (not 16)
v0.1.7
- bug fix
- enhanced DumbCalcProcessor and DumbCalculator
v0.1.6
- bug fix
v0.1.5
- bug fix
- moved demo code around
- added web-based calculator
v0.1.4
- bug fix
v0.1.3
- bug fix
- added richer text-based calculator demo
v0.1.2
- bug fix
- added DumbLineTemplate, DumbLineByLineScreen and DumbLineByLineScreen
v0.1.1
- bug fix
- added more documentations, and via run_demo function
v0.1.0
- initial release

rusty_dumb_tools 0.1.13