add startup hint, fix watcher panics

3 files changed, 23 insertions, 25 deletions

diff --git a/src/app/impl_self.rs b/src/app/impl_self.rs
index 2b115a0..744f906 100644
--- a/src/app/impl_self.rs
+++ b/src/app/impl_self.rs
@@ -16,24 +16,20 @@ use crate::habit::{Bit, Count, HabitWrapper, TrackEvent, ViewMode};
 use crate::utils;
 use crate::CONFIGURATION;
 
-use crate::app::{App, Message, MessageKind, StatusLine};
+use crate::app::{App, MessageKind, StatusLine};
 
 impl App {
     pub fn new() -> Self {
         let (tx, rx) = channel();
         let mut watcher = watcher(tx, Duration::from_secs(1)).unwrap();
-        watcher
-            .watch(utils::auto_habit_file(), RecursiveMode::Recursive)
-            .unwrap_or_else(|e| {
-                panic!("Unable to start file watcher: {}", e);
-            });
+        watcher.watch(utils::auto_habit_file(), RecursiveMode::Recursive);
         return App {
             habits: vec![],
             focus: 0,
             _file_watcher: watcher,
             file_event_recv: rx,
             view_month_offset: 0,
-            message: Message::default(),
+            message: "Type :add <habit-name> <goal> to get started, Ctrl-L to dismiss".into(),
         };
     }
 
@@ -147,15 +143,9 @@ impl App {
 
     pub fn max_size(&self) -> Vec2 {
         let grid_width = CONFIGURATION.grid_width;
-        let width = {
-            if self.habits.len() > 0 {
-                grid_width * CONFIGURATION.view_width
-            } else {
-                0
-            }
-        };
+        let width = grid_width * CONFIGURATION.view_width;
         let height = {
-            if self.habits.len() > 0 {
+            if !self.habits.is_empty() {
                 (CONFIGURATION.view_height as f64
                     * (self.habits.len() as f64 / grid_width as f64).ceil())
                     as usize
diff --git a/src/app/impl_view.rs b/src/app/impl_view.rs
index 0a6bce6..892b00c 100644
--- a/src/app/impl_view.rs
+++ b/src/app/impl_view.rs
@@ -5,7 +5,7 @@ use std::path::PathBuf;
 
 use cursive::direction::{Absolute, Direction};
 use cursive::event::{Event, EventResult, Key};
-use cursive::theme::{Color, Style};
+use cursive::theme::Color;
 use cursive::view::View;
 use cursive::{Printer, Vec2};
 use notify::DebouncedEvent;
@@ -48,23 +48,16 @@ impl View for App {
         let grid_width = CONFIGURATION.grid_width;
         let view_width = CONFIGURATION.view_width;
         let view_height = CONFIGURATION.view_height;
-        let width = {
-            if self.habits.len() > 0 {
-                grid_width * (view_width + 2)
-            } else {
-                0
-            }
-        };
+        let width = grid_width * (view_width + 2);
         let height = {
             if self.habits.len() > 0 {
                 (view_height as f64 * (self.habits.len() as f64 / grid_width as f64).ceil())
                     as usize
-                    + 2 // to acoomodate statusline and message line
             } else {
                 0
             }
         };
-        Vec2::new(width, height)
+        Vec2::new(width, height + 2)
     }
 
     fn take_focus(&mut self, _: Direction) -> bool {
@@ -89,6 +82,9 @@ impl View for App {
             }
             _ => {}
         };
+        if self.habits.is_empty() {
+            return EventResult::Ignored;
+        }
         match e {
             Event::Key(Key::Right) | Event::Key(Key::Tab) | Event::Char('l') => {
                 self.set_focus(Absolute::Right);
diff --git a/src/app/message.rs b/src/app/message.rs
index 34d3293..65f0a5c 100644
--- a/src/app/message.rs
+++ b/src/app/message.rs
@@ -17,6 +17,18 @@ impl From<MessageKind> for Color {
     }
 }
 
+impl<T> From<T> for Message
+where
+    T: AsRef<str>,
+{
+    fn from(item: T) -> Self {
+        return Message {
+            msg: item.as_ref().to_string(),
+            kind: MessageKind::Info,
+        };
+    }
+}
+
 pub struct Message {
     msg: String,
     kind: MessageKind,