RustyDumbTools (v0.1.12)

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.

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::("-v"));
    println!(". --verbose: {:?}", parser.get::("--verbose")); // will be the same parameter value as "-v"
    println!(". --name: {:?}", parser.get::("--name")); // can use "-n" as well
    println!(". str-arg: {:?}", parser.get::("str-arg"));
    println!(". i32-arg: {:?}", parser.get::("i32-arg"));
    println!(". multi-arg: {:?}", parser.get_multi::("multi-arg"));
}

| !!!
| !!! 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.  ...

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

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 = "0.1"
...

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% |
----------------------------------------

pub fn demo_lblscreen() {
    let mut lbl_demo_screen = {
        let mut comps = dlt_comps![
            "| ",
            dltc!("description", align = 'C').set_truncate_indicator("..."),
            " |"
        ];
        let temp1 = DumbLineTemplate::new_fixed_width(40, &comps);
        let mut comps = dlt_comps![
            "| ",
            ".".repeat(8),
            " |",
            dltc!("progress-bar"),
            ": ",
            dltc!("progress%", fixed_width = 4, align = 'R'),
            " |"
        ];
        let temp2 = DumbLineTemplate::new_fixed_width(40, &comps);
        let settings = LBLScreenSettings {
            top_line: Some("-".repeat(40)),
            bottom_line: Some("-".repeat(40)),
            //screen_height_adjustment: 0,
            ..LBLScreenSettings::default()
        };
        DumbLineByLineScreen::new(vec![temp1, temp2], settings)
    };
    lbl_demo_screen.init();
    let mut state = HashMap::<&str, String>::new();
    let mut progress_done_percent = 0;
    loop {
        let progress_percent = format!("{}%", progress_done_percent);
        let description = format!("... wait ... loading {} ...", progress_percent);
        let progress_bar = ">".repeat(progress_done_percent / 5_usize);
        state.insert("description", description);
        state.insert("progress-bar", progress_bar);
        state.insert("progress%", progress_percent);
        lbl_demo_screen.refresh(&state);
        thread::sleep(Duration::from_millis(200));
        progress_done_percent += 1;
        if progress_done_percent > 100 {
            break;
        }
    }
}

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`

pub fn demo_query_universities(country: &str, show_all: bool) {
    let stream = make_connection(&country);
    let result = match stream {
        Ok(mut stream) => process_connection(&mut stream, show_all),
        Err(e) => Err(format!("XXX error: [{}]", e)),
    };
    match result {
        Ok(_) => {}
        Err(e) => {
            println!("{}", e);
        }
    }
}
fn make_connection(country: &str) -> Result {
    let mut stream: TcpStream = TcpStream::connect("universities.hipolabs.com:80")?;
    let request = format!(
        "GET /search?country={} HTTP/1.1\r\nHost: universities.hipolabs.com\r\nAccept: application/json\r\nConnection: close\r\n\r\n",
        country.replace(" ", "%20")
    );
    stream.write_all(request.as_bytes())?;
    Ok(stream)
}
fn make_connection_get_response(country: &String) -> Result {
    match make_connection(country) {
        Ok(mut stream) => {
            let mut response = String::new();
            stream.read_to_string(&mut response)?;
            Ok(response)
        }
        Err(e) => Err(e),
    }
}
fn process_connection(stream: &mut TcpStream, show_all: bool) -> Result<(), String> {
    let mut handler = InPlaceJsonEntryHandler::new(move |json_entry| {
        let show = show_all || json_entry.field_name == "name";
        if show {
            println!(
                "* `{}` => `{}`",
                json_entry.field_name, json_entry.field_value
            );
        }
    });
    let mut json_processor = DumbJsonProcessor::new(Box::new(&mut handler));
    let mut progress = ProcessJsonProgress::new();
    let mut buf = [0; 32];
    loop {
        match stream.read(&mut buf) {
            Ok(size) => {
                if size == 0 {
                    return Ok(());
                }
                let bytes = &buf[..size];
                json_processor.push_json_bytes(bytes, &mut progress);
            }
            Err(e) => {
                return Err(format!("XXX error: [{}]", e));
            }
        }
    }
}

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:

• v0.1.12

  • 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