Update readme and usage

3 files changed, 28 insertions, 2 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 551bb3e..565faa0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,11 @@ version = "0.1.0"
 authors = ["meskio <meskio@sindominio.net>"]
 license = "GPL-3.0-or-later"
 description = "Display calendar .ics in command line"
+readme = "README.md"
+homepage = "https://gitlab.com/meskio/almanac"
+repository = "https://gitlab.com/meskio/almanac"
+documentation = "https://docs.rs/almanac/"
+keywords = ["calendar", "ics", "ical", "terminal", "console"]
 
 [dependencies]
 chrono = "0.4"
diff --git a/README.md b/README.md
index 45ed09e..c8ee994 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,17 @@
 # Almanac
 
-Simple .ics parser to print the following events on the command line.
+Simple .ics parser to pretty print the events on the terminal.
+
+## Usage
+
+```
+$ almanac week personal.ics other.ics
+
+Mon Dec 10 2018
+    17:00-18:00 event 1
+
+Wed Dec 12 2018
+    ----------- all day event
+                description
+    19:00-20:00 nother event
+```
diff --git a/src/main.rs b/src/main.rs
index 03eab2e..beca8d9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,7 +15,14 @@ use almanac::Event;
 
 fn main() {
     let mut args = env::args().skip(1);
-    let (first, last) = period(&args.next().unwrap());
+    let period_arg = match args.next() {
+        Some(arg) => arg,
+        None => {
+            println!("Usage: almanac [day|week|month] ics [ics ...]");
+            return;
+        }
+    };
+    let (first, last) = period(&period_arg);
 
     let calendars: Vec<_> = args.map(|arg| ics_calendar(&arg)).collect();
     let events = calendars