stew 0.2.0

Stew is a set of image transformation tools. It allows images to be transformed using individual executables and allows pipes to be used to combine multiple tools.
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use arrayvec::ArrayVec;
use clap::AppSettings;
use clap::Arg;
use stew_lib::get_app_skeleton;
use stew_lib::operations::operation_by_name;
use stew_lib::operations::OpArg;
use stew_lib::run;
use stew_lib::run_display_licenses;

const COMMAND_NAME: &str = "filter3x3";
const ARG1: &str = "F1";
const ARG2: &str = "F2";
const ARG3: &str = "F3";
const ARG4: &str = "S1";
const ARG5: &str = "S2";
const ARG6: &str = "S3";
const ARG7: &str = "T1";
const ARG8: &str = "T2";
const ARG9: &str = "T3";

fn main() -> Result<(), String> {
    let app = get_app_skeleton(COMMAND_NAME)
        .arg(
            Arg::with_name(ARG1)
                .help("First element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(1),
        )
        .arg(
            Arg::with_name(ARG2)
                .help("Second element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(2),
        )
        .arg(
            Arg::with_name(ARG3)
                .help("Third element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(3),
        )
        .arg(
            Arg::with_name(ARG4)
                .help("Fourth element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(4),
        )
        .arg(
            Arg::with_name(ARG5)
                .help("Fifth element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(5),
        )
        .arg(
            Arg::with_name(ARG6)
                .help("Sixth element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(6),
        )
        .arg(
            Arg::with_name(ARG7)
                .help("Seventh element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(7),
        )
        .arg(
            Arg::with_name(ARG8)
                .help("Eighth element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(8),
        )
        .arg(
            Arg::with_name(ARG9)
                .help("Ninth element of the 3x3 box filter (32 bit floating point).")
                .takes_value(true)
                .number_of_values(1)
                .allow_hyphen_values(true)
                .required_unless_one(&["license", "dep_licenses"])
                .index(9),
        )
        .global_setting(AppSettings::AllowLeadingHyphen);

    let matches = app.get_matches();
    let license_display = matches.is_present("license") || matches.is_present("dep_licenses");

    if license_display {
        run_display_licenses(&matches)
    } else {
        // uh oh
        match (
            matches.value_of(ARG1),
            matches.value_of(ARG2),
            matches.value_of(ARG3),
            matches.value_of(ARG4),
            matches.value_of(ARG5),
            matches.value_of(ARG6),
            matches.value_of(ARG7),
            matches.value_of(ARG8),
            matches.value_of(ARG9),
        ) {
            (
                Some(f1),
                Some(f2),
                Some(f3),
                Some(s1),
                Some(s2),
                Some(s3),
                Some(t1),
                Some(t2),
                Some(t3),
            ) => {
                let mut vec = ArrayVec::new();
                vec.push(parse_fp32(f1)?);
                vec.push(parse_fp32(f2)?);
                vec.push(parse_fp32(f3)?);
                vec.push(parse_fp32(s1)?);
                vec.push(parse_fp32(s2)?);
                vec.push(parse_fp32(s3)?);
                vec.push(parse_fp32(t1)?);
                vec.push(parse_fp32(t2)?);
                vec.push(parse_fp32(t3)?);

                let op = operation_by_name(COMMAND_NAME, OpArg::FloatingPointArrayVec9(vec));

                run(&matches, Some(op?))
            }
            _ => Err(
                "Filter3x3 requires exactly 9 arguments (32 bit floating point number)."
                    .to_string(),
            ),
        }
    }
}

fn parse_fp32(input: &str) -> Result<f32, String> {
    input.parse::<f32>().map_err(|_| {
        "Arguments of the filter3x3 command should be floating point numbers (f32).".to_string()
    })
}