eguidemo.rs

// egui hello world example, modified per
// https://www.reddit.com/r/learnrust/comments/v64f0q/egui_label_not_appearing/

#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use csv::{self};
use eframe::egui;

struct MyApp {
    filename: String,
    headers: Vec<String>,
    rows: Vec<Vec<String>>,
}

fn main() {
    let filename = std::env::args().nth(1).unwrap();
    let mut rdr = csv::Reader::from_path(&filename).unwrap();

    let headers: Vec<String> = rdr.headers().unwrap().iter().map(str::to_owned).collect();
    let rows: Vec<Vec<String>> = rdr
        .records()
        .map(|row| row.unwrap().iter().map(str::to_owned).collect())
        .collect();

    let app = MyApp {
        filename,
        headers,
        rows,
    };

    let options = eframe::NativeOptions::default();
    eframe::run_native("CSV Viewer", options, Box::new(|_cc| Box::new(app)));
}

// https://www.reddit.com/r/learnrust/comments/v64f0q/egui_label_not_appearing/
fn build_csv_grid(ui: &mut egui::Ui, app: &MyApp) {
    egui::Grid::new(&app.filename).show(ui, |ui| {
        for header in &app.headers {
            ui.label(header);
        }
        ui.end_row();
        for row in &app.rows {
            for f in row {
                ui.label(f);
            }
            ui.end_row();
        }
    });
}

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading(&self.filename);
            build_csv_grid(ui, self);
        });
    }
}