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--- /dev/null +++ b/src/main.rs @@ -0,0 +1,140 @@ +use std::str; +use std::fmt; +use curl::easy::{Easy, List}; +use serde_json::Value; +use clap::Parser; + +// +// Enums +// +#[derive(Debug,PartialEq,Eq,Copy,Clone)] +enum TemperatureUnits { + Metric, + Imperial, +} + +impl fmt::Display for TemperatureUnits { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + TemperatureUnits::Metric => write!(f, "Metric"), + TemperatureUnits::Imperial => write!(f, "Imperial"), + } + } +} + +// Commandline parsing +#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +struct CommandlineArgs { + /// Name of the weather station + #[arg(short, long, default_value = "khio")] + station: String, + + /// Use Metric units. Imperial units otherwise + #[arg(short, long)] + metric: bool, +} + + +// +// Application options +// +#[derive(Debug,Clone)] +struct AppOptions { + units: TemperatureUnits, + station: String, +} + +// +// Application (BarWeather) +// +struct BarWeather { + // acts :BarWeatherActions + opts :AppOptions, +} + +impl BarWeather { + fn run(self) { + self.check_options(); + self.get_weather(); + } + + fn get_weather(self) { + // Print a web page onto stdout + let mut easy = Easy::new(); + let app = self; + let url_string_1 :String = "https://api.weather.gov/stations/".to_owned(); + let url_string_2 :&str = app.opts.station.as_str(); + let url_string_3 :String = "/observations?limit=1".to_owned(); + let url_string = url_string_1 + url_string_2 + &url_string_3; + easy.url(url_string.as_str()).unwrap(); + + let mut list = List::new(); + list.append("User-Agent: Bar Weather (mahesh@heshapps.com)").unwrap(); + easy.http_headers(list).unwrap(); + + easy.write_function(move |data| { + // To debug returned JSON + // use std::io::{stdout, Write}; + // stdout().write_all(data).unwrap(); + + let v: Value = serde_json::from_str(str::from_utf8(data).unwrap()).unwrap(); + let temperature_value :f32 = app.get_current_temperature(v); + let temperature_unit :String = app.get_temperature_unit(); + + println!("{}{}", temperature_value, temperature_unit); + println!("{:.2}{}", temperature_value, temperature_unit); + + Ok(data.len()) + + } + ).unwrap(); + easy.perform().unwrap(); + } + + fn check_options(&self) -> bool { + let mut all_good = true; + + if ! ((self.opts.units == TemperatureUnits::Metric) + || (self.opts.units == TemperatureUnits::Imperial)) { + all_good &= false; + } + + return all_good; + } + + fn get_current_temperature(&self, v: Value) -> f32 { + let deg_c :f32 = v["features"][0]["properties"]["temperature"]["value"] + .to_string().parse().unwrap(); + + return if self.opts.units == TemperatureUnits::Metric { deg_c } + else { (deg_c * 9.0 / 5.0) + 32.0}; + } + + fn get_temperature_unit(&self) -> String{ + return if self.opts.units == TemperatureUnits::Metric { "°C".to_string() } + else { "°F".to_string() }; + } +} + +// +// Entry point +// +fn main() { + let cmd_args = CommandlineArgs::parse(); + let app = BarWeather { + //acts: BarWeatherActions { + opts: AppOptions { + // units: TemperatureUnits::Imperial, + // units: TemperatureUnits::Metric, + units: if cmd_args.metric { TemperatureUnits::Metric } + else { TemperatureUnits::Imperial }, + station: cmd_args.station, + }, + //}, + }; + + app.run(); +} +// References: +// https://reintech.io/blog/working-with-json-in-rust diff --git a/src/main.rs.backup b/src/main.rs.backup new file mode 100644 index 0000000..bcfe7fd --- /dev/null +++ b/src/main.rs.backup @@ -0,0 +1,134 @@ +use std::str; +use std::fmt; +use curl::easy::{Easy, List}; +use serde_json::Value; + +// +// Enums +// +#[derive(Debug,PartialEq,Eq,Copy,Clone)] +enum TemperatureUnits { + Metric, + Imperial, +} + +impl fmt::Display for TemperatureUnits { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + TemperatureUnits::Metric => write!(f, "Metric"), + TemperatureUnits::Imperial => write!(f, "Imperial"), + } + } +} + +// Commandline parsing +#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +struct CommandlineArgs { + /// Name of the weather station + #[arg(short, long, default_value = "khio")] + station: String, +} + + +// +// Application options +// +#[derive(Debug,Copy,Clone)] +struct AppOptions { + units: TemperatureUnits, + station: String, +} + +// +// Application (BarWeather) actions +struct BarWeatherActions { + opts :AppOptions, +} + +impl BarWeatherActions { + fn check_options(&self) -> bool { + let mut all_good = true; + + if ! ((self.opts.units == TemperatureUnits::Metric) + || (self.opts.units == TemperatureUnits::Imperial)) { + all_good &= false; + } + + return all_good; + } + + fn get_current_temperature(&self, v: Value) -> f32 { + let deg_c :f32 = v["features"][0]["properties"]["temperature"]["value"] + .to_string().parse().unwrap(); + + return if self.opts.units == TemperatureUnits::Metric { deg_c } + else { (deg_c * 9.0 / 5.0) + 32.0}; + } + + fn get_temperature_unit(&self) -> String{ + return if self.opts.units == TemperatureUnits::Metric { "°C".to_string() } + else { "°F".to_string() }; + } +} + +// +// Application (BarWeather) +// +struct BarWeather { + acts :BarWeatherActions +} + +impl BarWeather { + fn run(self) { + self.acts.check_options(); + self.get_weather(); + } + + fn get_weather(self) { + // Print a web page onto stdout + let mut easy = Easy::new(); + let app = self; + easy.url("https://api.weather.gov/stations/" + + "/observations?limit=1").unwrap(); + + let mut list = List::new(); + list.append("User-Agent: Bar Weather (mahesh@heshapps.com)").unwrap(); + easy.http_headers(list).unwrap(); + + easy.write_function(move |data| { + // To debug returned JSON + // use std::io::{stdout, Write}; + // stdout().write_all(data).unwrap(); + + let v: Value = serde_json::from_str(str::from_utf8(data).unwrap()).unwrap(); + let temperature_value :f32 = app.acts.get_current_temperature(v); + let temperature_unit :String = app.acts.get_temperature_unit(); + + println!("{}{}", temperature_value, temperature_unit); + println!("{:.2}{}", temperature_value, temperature_unit); + + Ok(data.len()) + + } + ).unwrap(); + easy.perform().unwrap(); + } +} + +// +// Entry point +// +fn main() { + let app = BarWeather { + acts: BarWeatherActions { + opts: AppOptions { + units: TemperatureUnits::Imperial, + // units: TemperatureUnits::Metric, + }, + }, + }; + + app.run(); +} +// References: +// https://reintech.io/blog/working-with-json-in-rust