EpisodeWidget: Add a Date state machine.

hammond-gtk/src/widgets/episode.rs

@@ -1,11 +1,9 @@
 use glib;
 use gtk;
-
-use chrono::prelude::*;
 use gtk::prelude::*;
 
 use failure::Error;
-use humansize::{file_size_opts as size_opts, FileSize};
+use humansize::FileSize;
 use open;
 use take_mut;
 
@@ -22,30 +20,10 @@ use std::path::Path;
 use std::sync::{Arc, Mutex};
 use std::sync::mpsc::Sender;
 
-lazy_static! {
-    pub static ref SIZE_OPTS: Arc<size_opts::FileSizeOpts> =  {
-        // Declare a custom humansize option struct
-        // See: https://docs.rs/humansize/1.0.2/humansize/file_size_opts/struct.FileSizeOpts.html
-        Arc::new(size_opts::FileSizeOpts {
-            divider: size_opts::Kilo::Binary,
-            units: size_opts::Kilo::Decimal,
-            decimal_places: 0,
-            decimal_zeroes: 0,
-            fixed_at: size_opts::FixedAt::No,
-            long_units: false,
-            space: true,
-            suffix: "",
-            allow_negative: false,
-        })
-    };
-
-    static ref NOW: DateTime<Utc> = Utc::now();
-}
-
 #[derive(Debug, Clone)]
 pub struct EpisodeWidget {
     pub container: gtk::Box,
-    date: gtk::Label,
+    date: Arc<Mutex<DateMachine>>,
     title: Arc<Mutex<TitleMachine>>,
     duration: Arc<Mutex<DurationMachine>>,
     media: Arc<Mutex<MediaMachine>>,
@@ -73,6 +51,7 @@ impl Default for EpisodeWidget {
         let prog_separator: gtk::Label = builder.get_object("prog_separator").unwrap();
 
         let title_machine = Arc::new(Mutex::new(TitleMachine::new(title, false)));
+        let date_machine = Arc::new(Mutex::new(DateMachine::new(date, 0)));
         let dur = DurationMachine::new(duration, separator1, None);
         let duration_machine = Arc::new(Mutex::new(dur));
         let _media = MediaMachine::new(
@@ -91,7 +70,7 @@ impl Default for EpisodeWidget {
             container,
             title: title_machine,
             duration: duration_machine,
-            date,
+            date: date_machine,
             media: media_machine,
         }
     }
@@ -108,11 +87,13 @@ impl EpisodeWidget {
         WidgetExt::set_name(&self.container, &episode.rowid().to_string());
 
         // Set the date label.
-        self.set_date(episode.epoch());
+        if let Err(err) = self.set_date(episode.epoch()) {
+            error!("Failed to determine date state: {}", err);
+        }
 
         // Set the title label state.
         if let Err(err) = self.set_title(&episode) {
-            error!("Failed to set title state: {}", err);
+            error!("Failed to determine title state: {}", err);
         }
 
         // Set the duaration label.
@@ -166,14 +147,12 @@ impl EpisodeWidget {
     }
 
     /// Set the date label depending on the current time.
-    fn set_date(&self, epoch: i32) {
-        let date = Utc.timestamp(i64::from(epoch), 0);
-        if NOW.year() == date.year() {
-            self.date.set_text(date.format("%e %b").to_string().trim());
-        } else {
-            self.date
-                .set_text(date.format("%e %b %Y").to_string().trim());
-        };
+    fn set_date(&self, epoch: i32) -> Result<(), Error> {
+        let mut lock = self.date.lock().map_err(|err| format_err!("{}", err))?;
+        take_mut::take(lock.deref_mut(), |date| {
+            date.determine_state(i64::from(epoch))
+        });
+        Ok(())
     }
 
     /// Set the duration label.

hammond-gtk/src/widgets/episode_states.rs

@@ -8,13 +8,34 @@
 use chrono;
 use glib;
 use gtk;
+
+use chrono::prelude::*;
 use gtk::prelude::*;
-use humansize::FileSize;
+use humansize::{file_size_opts as size_opts, FileSize};
 
 use std::sync::{Arc, Mutex};
 
 use manager::Progress as OtherProgress;
-use widgets::episode::SIZE_OPTS;
+
+lazy_static! {
+    pub static ref SIZE_OPTS: Arc<size_opts::FileSizeOpts> =  {
+        // Declare a custom humansize option struct
+        // See: https://docs.rs/humansize/1.0.2/humansize/file_size_opts/struct.FileSizeOpts.html
+        Arc::new(size_opts::FileSizeOpts {
+            divider: size_opts::Kilo::Binary,
+            units: size_opts::Kilo::Decimal,
+            decimal_places: 0,
+            decimal_zeroes: 0,
+            fixed_at: size_opts::FixedAt::No,
+            long_units: false,
+            space: true,
+            suffix: "",
+            allow_negative: false,
+        })
+    };
+
+    static ref NOW: DateTime<Utc> = Utc::now();
+}
 
 #[derive(Debug, Clone)]
 pub struct UnInitialized;
@@ -153,6 +174,96 @@ impl TitleMachine {
     }
 }
 
+#[derive(Debug, Clone)]
+pub struct Usual;
+#[derive(Debug, Clone)]
+pub struct YearShown;
+
+impl From<Usual> for YearShown {
+    fn from(_: Usual) -> Self {
+        YearShown {}
+    }
+}
+
+impl From<YearShown> for Usual {
+    fn from(_: YearShown) -> Self {
+        Usual {}
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Date<S> {
+    date: gtk::Label,
+    epoch: i64,
+    state: S,
+}
+
+impl Date<Usual> {
+    fn new(date: gtk::Label, epoch: i64) -> Self {
+        let ts = Utc.timestamp(i64::from(epoch), 0);
+        date.set_text(ts.format("%e %b").to_string().trim());
+
+        Date {
+            date,
+            epoch,
+            state: Usual {},
+        }
+    }
+}
+
+impl From<Date<Usual>> for Date<YearShown> {
+    fn from(f: Date<Usual>) -> Self {
+        let ts = Utc.timestamp(f.epoch, 0);
+        f.date.set_text(ts.format("%e %b %Y").to_string().trim());
+
+        Date {
+            date: f.date,
+            epoch: f.epoch,
+            state: YearShown {},
+        }
+    }
+}
+
+impl From<Date<YearShown>> for Date<Usual> {
+    fn from(f: Date<YearShown>) -> Self {
+        let ts = Utc.timestamp(f.epoch, 0);
+        f.date.set_text(ts.format("%e %b").to_string().trim());
+
+        Date {
+            date: f.date,
+            epoch: f.epoch,
+            state: Usual {},
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub enum DateMachine {
+    Usual(Date<Usual>),
+    WithYear(Date<YearShown>),
+}
+
+impl DateMachine {
+    pub fn new(label: gtk::Label, epoch: i64) -> Self {
+        let m = DateMachine::Usual(Date::<Usual>::new(label, epoch));
+        m.determine_state(epoch)
+    }
+
+    pub fn determine_state(self, epoch: i64) -> Self {
+        use self::DateMachine::*;
+
+        let ts = Utc.timestamp(epoch, 0);
+        let is_old = NOW.year() == ts.year();
+
+        match (self, is_old) {
+            (date @ Usual(_), false) => date,
+            (date @ WithYear(_), true) => date,
+            (Usual(val), true) => WithYear(val.into()),
+            (WithYear(val), false) => Usual(val.into()),
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct Duration<S: Visibility> {
     // TODO: make duration and separator diff types