debug log when loading calendar files

only supports: error,warn,info,debug,trace,off

if not set or any other value maps to info

src/main.rs

@@ -5,7 +5,7 @@ mod model;
 
 use app::CalendarApp;
 use iced::Task;
-use std::path;
+use std::{env, path};
 use clap::Parser;
 use log::info;
 use simplelog::{SimpleLogger, Config};
@@ -70,5 +70,17 @@ pub fn main() -> iced::Result {
 }
 
 fn set_up_logger() {
-	SimpleLogger::init(log::LevelFilter::Info, Config::default()).unwrap();
+	let level = match env::var("RUST_LOG") {
+		Err(_) => log::LevelFilter::Info,
+		Ok(value) => match value.as_str() {
+			"error" => log::LevelFilter::Error,
+			"warn" => log::LevelFilter::Warn,
+			"info" => log::LevelFilter::Info,
+			"debug" => log::LevelFilter::Debug,
+			"trace" => log::LevelFilter::Trace,
+			"off" => log::LevelFilter::Off,
+			_ => log::LevelFilter::Info // anything else maps to info
+		}
+	};
+	SimpleLogger::init(level, Config::default()).unwrap();
 }

src/model/ical_bridge.rs

@@ -3,7 +3,7 @@ use icalendar::{Component, DatePerhapsTime, CalendarDateTime, CalendarComponent}
 use chrono::NaiveDate;
 use crate::model::events::EventsCollection;
 use std::fs;
-use log::warn;
+use log::{warn, debug};
 
 use super::events::EventType;
 
@@ -23,6 +23,7 @@ fn as_date(cal_date: &DatePerhapsTime) -> NaiveDate {
 }
 
 fn create_event(events: &mut EventsCollection, event: &icalendar::Event, ev_type: &EventType) {
+	debug!("  calendar event: {:?}", event);
     events.create(
 		as_date(&event.get_start().unwrap()),
 		as_date(&event.get_end().unwrap()).pred_opt().unwrap(),
@@ -33,6 +34,8 @@ fn create_event(events: &mut EventsCollection, event: &icalendar::Event, ev_type
 pub fn load_calendar(calendar_path: &std::path::Path, events: &mut EventsCollection) {
     let mut calendar = icalendar::Calendar::new();
 
+	debug!("reading calendar: {:?}", calendar_path);
+
     let contents = match fs::read_to_string(calendar_path) {
         Ok(file_content) => file_content,
         Err(e) => { warn!("Could not read the calendar: {}", e); return; },