start the ical formatter

src/formatters.rs

@@ -11,6 +11,7 @@ pub mod text;
 pub mod csv;
 pub mod json;
 pub mod ids;
+pub mod ical;
 
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
@@ -19,6 +20,7 @@ pub enum Formatter {
     Csv,
     Json,
     Ids,
+    Ical,
     Custom(String),
 }
 
@@ -41,6 +43,7 @@ impl Formatter {
             Formatter::Csv => csv::print_formatted(entries, out, ids)?,
             Formatter::Json => json::print_formatted(entries, out)?,
             Formatter::Ids => ids::print_formatted(entries, out)?,
+            Formatter::Ical => ical::print_formatted(entries, out)?,
             Formatter::Custom(name) => {
                 panic!("attempted custom formatter with name {} which is not implemented", name);
             }
@@ -61,6 +64,7 @@ impl FromStr for Formatter {
             "csv" => Formatter::Csv,
             "json" => Formatter::Json,
             "ids" => Formatter::Ids,
+            "ical" => Formatter::Ical,
             custom_format => Formatter::Custom(custom_format.into()),
         })
     }

src/formatters/ical.rs

@@ -0,0 +1,50 @@
+use std::io::Write;
+
+use crate::models::Entry;
+use crate::error::Result;
+
+pub fn print_formatted<W: Write>(entries: Vec<Entry>, out: &mut W) -> Result<()> {
+    unimplemented!()
+}
+
+#[cfg(test)]
+mod tests {
+    use pretty_assertions::assert_eq;
+    use chrono::{Utc, Duration};
+
+    use crate::test_utils::PrettyString;
+
+    use super::*;
+
+    #[test]
+    fn ical_format() {
+        let now = Utc::now();
+        let an_hour_ago = now - Duration::hours(1);
+        let entries = vec![
+            Entry::new_sample(1, an_hour_ago, Some(now)),
+            Entry::new_sample(1, an_hour_ago, None),
+        ];
+
+        let mut out = Vec::new();
+
+        print_formatted(entries, &mut out).unwrap();
+
+        assert_eq!(PrettyString(&String::from_utf8_lossy(&out)), PrettyString(&format!("\
+            BEGIN:VCALENDAR\
+            CALSCALE:GREGORIAN\
+            METHOD:PUBLISH\
+            PRODID:tiempo-rs\
+            VERSION:2.0\
+            BEGIN:VEVENT\
+            DESCRIPTION:{note}\
+            DTEND:{end}\
+            DTSTAMP:{now}\
+            DTSTART:{start}\
+            SEQUENCE:0\
+            SUMMARY:{note}\
+            UID:{uid}@{host}\
+            END:VEVENT\
+            END:VCALENDAR\
+        ")));
+    }
+}