5 files changed, 130 insertions, 29 deletions

diff --git a/src/app/cursor.rs b/src/app/cursor.rs
new file mode 100644
index 0000000..f76d591
--- /dev/null
+++ b/src/app/cursor.rs
@@ -0,0 +1,71 @@
+use chrono::{Duration, Local, NaiveDate};
+use cursive::direction::Absolute;
+
+#[derive(Debug, Copy, Clone)]
+pub struct Cursor(pub NaiveDate);
+
+impl std::default::Default for Cursor {
+    fn default() -> Self {
+        Cursor::new()
+    }
+}
+
+impl Cursor {
+    pub fn new() -> Self {
+        Cursor {
+            0: Local::now().naive_local().date(),
+        }
+    }
+    pub fn small_seek(&mut self, d: Absolute) {
+        let today = Local::now().naive_local().date();
+        let cursor = self.0;
+        match d {
+            Absolute::Right => {
+                // forward by 1 day
+                let next = cursor.succ_opt().unwrap_or(cursor);
+                if next <= today {
+                    self.0 = next;
+                }
+            }
+            Absolute::Left => {
+                // backward by 1 day
+                // assumes an infinite past
+                self.0 = cursor.pred_opt().unwrap_or(cursor);
+            }
+            Absolute::Down => {
+                // forward by 1 week
+                let next = cursor.checked_add_signed(Duration::weeks(1)).unwrap();
+                if next <= today {
+                    self.0 = next;
+                }
+            }
+            Absolute::Up => {
+                // backward by 1 week
+                // assumes an infinite past
+                let next = cursor.checked_sub_signed(Duration::weeks(1)).unwrap();
+                self.0 = next;
+            }
+            Absolute::None => {}
+        }
+    }
+    fn long_seek(&mut self, offset: Duration) {
+        let cursor = self.0;
+        let today = Local::now().naive_local().date();
+        let next = cursor.checked_add_signed(offset).unwrap_or(cursor);
+
+        if next <= today {
+            self.0 = next;
+        } else {
+            self.0 = today;
+        }
+    }
+    pub fn month_forward(&mut self) {
+        self.long_seek(Duration::weeks(4));
+    }
+    pub fn month_backward(&mut self) {
+        self.long_seek(Duration::weeks(-4));
+    }
+    pub fn reset(&mut self) {
+        self.0 = Local::now().naive_local().date();
+    }
+}
diff --git a/src/app/impl_self.rs b/src/app/impl_self.rs
index 1114d50..d5f93ff 100644
--- a/src/app/impl_self.rs
+++ b/src/app/impl_self.rs
@@ -6,7 +6,7 @@ use std::path::PathBuf;
 use std::sync::mpsc::channel;
 use std::time::Duration;
 
-use chrono::Local;
+use chrono::{Local, NaiveDate};
 use cursive::direction::Absolute;
 use cursive::Vec2;
 use notify::{watcher, RecursiveMode, Watcher};
@@ -15,7 +15,7 @@ use crate::command::{Command, CommandLineError};
 use crate::habit::{Bit, Count, HabitWrapper, TrackEvent, ViewMode};
 use crate::utils::{self, GRID_WIDTH, VIEW_HEIGHT, VIEW_WIDTH};
 
-use crate::app::{App, MessageKind, StatusLine};
+use crate::app::{App, Cursor, Message, MessageKind, StatusLine};
 
 impl App {
     pub fn new() -> Self {
@@ -27,8 +27,8 @@ impl App {
             focus: 0,
             _file_watcher: watcher,
             file_event_recv: rx,
-            view_month_offset: 0,
-            message: "Type :add <habit-name> <goal> to get started, Ctrl-L to dismiss".into(),
+            cursor: Cursor::new(),
+            message: Message::startup(),
         };
     }
 
@@ -53,35 +53,42 @@ impl App {
         if self.habits.is_empty() {
             return ViewMode::Day;
         }
-        return self.habits[self.focus].view_mode();
+        return self.habits[self.focus].inner_data_ref().view_mode();
     }
 
     pub fn set_mode(&mut self, mode: ViewMode) {
         if !self.habits.is_empty() {
-            self.habits[self.focus].set_view_mode(mode);
+            self.habits[self.focus]
+                .inner_data_mut_ref()
+                .set_view_mode(mode);
         }
     }
 
-    pub fn set_view_month_offset(&mut self, offset: u32) {
-        self.view_month_offset = offset;
+    pub fn sift_backward(&mut self) {
+        self.cursor.month_backward();
         for v in self.habits.iter_mut() {
-            v.set_view_month_offset(offset);
+            v.inner_data_mut_ref().cursor.month_backward();
         }
     }
 
-    pub fn sift_backward(&mut self) {
-        self.view_month_offset += 1;
+    pub fn sift_forward(&mut self) {
+        self.cursor.month_forward();
         for v in self.habits.iter_mut() {
-            v.set_view_month_offset(self.view_month_offset);
+            v.inner_data_mut_ref().cursor.month_forward();
         }
     }
 
-    pub fn sift_forward(&mut self) {
-        if self.view_month_offset > 0 {
-            self.view_month_offset -= 1;
-            for v in self.habits.iter_mut() {
-                v.set_view_month_offset(self.view_month_offset);
-            }
+    pub fn reset_cursor(&mut self) {
+        self.cursor.reset();
+        for v in self.habits.iter_mut() {
+            v.inner_data_mut_ref().cursor.reset();
+        }
+    }
+
+    pub fn move_cursor(&mut self, d: Absolute) {
+        self.cursor.small_seek(d);
+        for v in self.habits.iter_mut() {
+            v.inner_data_mut_ref().move_cursor(d);
         }
     }
 
@@ -125,11 +132,12 @@ impl App {
         let total = self.habits.iter().map(|h| h.goal()).sum::<u32>();
         let completed = total - remaining;
 
-        let timestamp = if self.view_month_offset == 0 {
+        let timestamp = if self.cursor.0 == today {
             format!("{}", Local::now().naive_local().date().format("%d/%b/%y"),)
         } else {
-            let months = self.view_month_offset;
-            format!("{}", format!("{} months ago", months),)
+            let since = NaiveDate::signed_duration_since(today, self.cursor.0).num_days();
+            let plural = if since == 1 { "" } else { "s" };
+            format!("{} ({} day{} ago)", self.cursor.0, since, plural)
         };
 
         StatusLine {
diff --git a/src/app/impl_view.rs b/src/app/impl_view.rs
index 395cac4..c369d8f 100644
--- a/src/app/impl_view.rs
+++ b/src/app/impl_view.rs
@@ -95,11 +95,29 @@ impl View for App {
                 self.set_focus(Absolute::Down);
                 return EventResult::Consumed(None);
             }
+
+            Event::Char('K') => {
+                self.move_cursor(Absolute::Up);
+                return EventResult::Consumed(None);
+            }
+            Event::Char('H') => {
+                self.move_cursor(Absolute::Left);
+                return EventResult::Consumed(None);
+            }
+            Event::Char('J') => {
+                self.move_cursor(Absolute::Down);
+                return EventResult::Consumed(None);
+            }
+            Event::Char('L') => {
+                self.move_cursor(Absolute::Right);
+                return EventResult::Consumed(None);
+            }
+
             Event::Char('v') => {
                 if self.habits.is_empty() {
                     return EventResult::Consumed(None);
                 }
-                if self.habits[self.focus].view_mode() == ViewMode::Week {
+                if self.habits[self.focus].inner_data_ref().view_mode() == ViewMode::Week {
                     self.set_mode(ViewMode::Day)
                 } else {
                     self.set_mode(ViewMode::Week)
@@ -108,14 +126,15 @@ impl View for App {
             }
             Event::Char('V') => {
                 for habit in self.habits.iter_mut() {
-                    habit.set_view_mode(ViewMode::Week);
+                    habit.inner_data_mut_ref().set_view_mode(ViewMode::Week);
                 }
                 return EventResult::Consumed(None);
             }
             Event::Key(Key::Esc) => {
                 for habit in self.habits.iter_mut() {
-                    habit.set_view_mode(ViewMode::Day);
+                    habit.inner_data_mut_ref().set_view_mode(ViewMode::Day);
                 }
+                self.reset_cursor();
                 return EventResult::Consumed(None);
             }
 
@@ -131,7 +150,7 @@ impl View for App {
                 return EventResult::Consumed(None);
             }
             Event::Char('}') => {
-                self.set_view_month_offset(0);
+                self.reset_cursor();
                 return EventResult::Consumed(None);
             }
             Event::CtrlChar('l') => {
@@ -141,14 +160,12 @@ impl View for App {
             }
 
             /* Every keybind that is not caught by App trickles
-             * down to the focused habit. We sift back to today
-             * before performing any action, "refocusing" the cursor
+             * down to the focused habit.
              * */
             _ => {
                 if self.habits.is_empty() {
                     return EventResult::Ignored;
                 }
-                self.set_view_month_offset(0);
                 self.habits[self.focus].on_event(e)
             }
         }
diff --git a/src/app/message.rs b/src/app/message.rs
index 65f0a5c..a1d3d57 100644
--- a/src/app/message.rs
+++ b/src/app/message.rs
@@ -35,6 +35,9 @@ pub struct Message {
 }
 
 impl Message {
+    pub fn startup() -> Self {
+        "Type :add <habit-name> <goal> to get started, Ctrl-L to dismiss".into()
+    }
     pub fn contents(&self) -> &str {
         &self.msg
     }
diff --git a/src/app/mod.rs b/src/app/mod.rs
index 2aecb33..726a656 100644
--- a/src/app/mod.rs
+++ b/src/app/mod.rs
@@ -5,11 +5,13 @@ use notify::{DebouncedEvent, RecommendedWatcher};
 
 use crate::habit::HabitWrapper;
 
+mod cursor;
 mod impl_self;
 mod impl_view;
 mod message;
 
 pub struct StatusLine(String, String);
+pub use cursor::Cursor;
 pub use message::{Message, MessageKind};
 
 pub struct App {
@@ -19,7 +21,7 @@ pub struct App {
     _file_watcher: RecommendedWatcher,
     file_event_recv: Receiver<DebouncedEvent>,
     focus: usize,
-    view_month_offset: u32,
+    cursor: Cursor,
     message: Message,
 }