From 8b628e3cda3753ab574456afd1a34c4a6106a264 Mon Sep 17 00:00:00 2001
From: Julio Biason <julio.biason@pm.me>
Date: Thu, 7 May 2020 19:42:54 -0300
Subject: [PATCH] Listing events

---
 README.md                  |  1 +
 src/eventlist/event.rs     | 35 +++++++++++++++++++++++++++++++++++
 src/eventlist/eventlist.rs | 34 +++++++++++++++++++++++++++++++++-
 src/main.rs                |  5 ++++-
 4 files changed, 73 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index f930916..6c9a3dc 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ tell you that you have 15 days up to it.
 ## TODO
 
 - [x] Add unique identifier for each event
+- [x] List events
 - [ ] Removing events
 - [ ] Replace `dbg!` with [env_logger](https://crates.io/crates/env_logger)
 	(reasoning: Although `dbg!` is nice and dandy, it can't be disabled, and
diff --git a/src/eventlist/event.rs b/src/eventlist/event.rs
index 1d1f736..0462205 100644
--- a/src/eventlist/event.rs
+++ b/src/eventlist/event.rs
@@ -16,7 +16,11 @@
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+use std::convert::From;
+use std::fmt;
+
 use chrono::prelude::*;
+use chrono::DateTime;
 use serde_derive::Deserialize;
 use serde_derive::Serialize;
 use uuid::Uuid;
@@ -41,6 +45,15 @@ pub enum EventDateType {
     AtTime(Date, Time),
 }
 
+impl From<&EventDateType> for DateTime<Utc> {
+    fn from(origin: &EventDateType) -> Self {
+        match origin {
+            EventDateType::AllDay(d) => Utc.ymd(d.year, d.month, d.day).and_hms(0, 0, 0),
+            _ => Utc.ymd(1970, 1, 1).and_hms(0, 0, 0),
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct Event {
     id: String,
@@ -66,4 +79,26 @@ impl Event {
             panic!("Failed to parse the date");
         }
     }
+
+    pub fn eta(&self) -> Option<String> {
+        let now = Utc::now();
+        let to: DateTime<Utc> = (&self.due).into();
+        let eta = to - now;
+        Some(format!("{}d", eta.num_days()))
+    }
+}
+
+impl fmt::Display for Event {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{:8} - {:>6} - {}",
+            self.id,
+            match self.eta() {
+                Some(x) => x,
+                None => "".into(),
+            },
+            self.description
+        )
+    }
 }
diff --git a/src/eventlist/eventlist.rs b/src/eventlist/eventlist.rs
index 4b0145b..62e0c03 100644
--- a/src/eventlist/eventlist.rs
+++ b/src/eventlist/eventlist.rs
@@ -29,7 +29,13 @@ static FILENAME: &str = "events.toml";
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct EventList {
-    events: Vec<Event>,
+    pub events: Vec<Event>,
+}
+
+pub struct EventListIterator<'a> {
+    index: usize,
+    max: usize,
+    list: &'a Vec<Event>,
 }
 
 impl EventList {
@@ -59,3 +65,29 @@ impl EventList {
         }
     }
 }
+
+impl<'a> IntoIterator for &'a EventList {
+    type Item = &'a Event;
+    type IntoIter = EventListIterator<'a>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        EventListIterator {
+            index: 0,
+            max: self.events.len(),
+            list: &self.events,
+        }
+    }
+}
+
+impl<'a> Iterator for EventListIterator<'a> {
+    type Item = &'a Event;
+
+    fn next(&mut self) -> Option<&'a Event> {
+        if self.index >= self.max {
+            None
+        } else {
+            self.index += 1;
+            Some(&self.list[self.index - 1])
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 8010188..55378d5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -33,7 +33,10 @@ fn main() {
 }
 
 fn list() {
-    unimplemented!()
+    let event_list = EventList::load();
+    for record in event_list.into_iter() {
+        println!("{}", record);
+    }
 }
 
 fn add_with_date(description: &str, date: &str) {