Implemented iCal file creation

Cargo.lock

@@ -312,6 +312,12 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "ics"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fd80257c65d91b3eb7ef6b5c29af82d738ce0b06e2a864b6a875d04831c5af3"
+
 [[package]]
 name = "idna"
 version = "0.2.2"
@@ -433,6 +439,7 @@ dependencies = [
  "bitflags",
  "env_logger",
  "ical",
+ "ics",
  "log",
  "minidom",
  "reqwest",

Cargo.toml

@@ -24,3 +24,4 @@ async-trait = "0.1"
 uuid = { version = "0.8", features = ["v4"] }
 sanitize-filename = "0.3"
 ical = "0.7"
+ics = "0.5"

src/ical/builder.rs

@@ -1,5 +1,71 @@
 //! A module to build ICal files
 
-pub fn build_from() {
+use std::error::Error;
 
+use ics::properties::{Comment, Status, Summary};
+use ics::{ICalendar, ToDo};
+
+use crate::item::Item;
+use crate::settings::{ORG_NAME, PRODUCT_NAME};
+
+fn ical_product_id() -> String {
+    format!("-//{}//{}//EN", ORG_NAME, PRODUCT_NAME)
+}
+
+/// Create an iCal item from a `crate::item::Item`
+pub fn build_from(item: &Item) -> Result<String, Box<dyn Error>> {
+    let mut todo = ToDo::new(item.uid(), "20181021T190000");
+    todo.push(Summary::new("Take pictures of squirrels (with ÜTF-8 chars)"));
+    todo.push(Comment::new("That's really something I'd like to do one day"));
+
+    match item {
+        Item::Task(t) => {
+            let status = if t.completed() { Status::completed() } else { Status::needs_action() };
+            todo.push(status);
+        },
+        _ => {
+            unimplemented!()
+        },
+    }
+
+    let mut calendar = ICalendar::new("2.0", ical_product_id());
+    calendar.add_todo(todo);
+
+    Ok(calendar.to_string())
+}
+
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::Task;
+
+    #[test]
+    fn test_ical_from_task() {
+        let cal_id = "http://my.calend.ar/id".parse().unwrap();
+        let task = Item::Task(Task::new(
+            String::from("This is a task"), true, &cal_id
+        ));
+        let expected_ical = format!("BEGIN:VCALENDAR\r\n\
+            VERSION:2.0\r\n\
+            PRODID:-//{}//{}//EN\r\n\
+            BEGIN:VTODO\r\n\
+            UID:{}\r\n\
+            DTSTAMP:20181021T190000\r\n\
+            SUMMARY:Take pictures of squirrels (with ÜTF-8 chars)\r\n\
+            COMMENT:That's really something I'd like to do one day\r\n\
+            STATUS:COMPLETED\r\n\
+            END:VTODO\r\n\
+            END:VCALENDAR\r\n", ORG_NAME, PRODUCT_NAME, task.uid());
+
+        let ical = build_from(&task);
+        assert_eq!(ical.unwrap(), expected_ical);
+    }
+
+    #[test]
+    #[ignore]
+    fn test_ical_from_event() {
+        unimplemented!();
+    }
 }

src/settings.rs

@@ -7,3 +7,5 @@ pub const PASSWORD: &str = "secret_password";
 pub const EXAMPLE_TASK_URL: &str =     "https://my.server.com/remote.php/dav/calendars/john/6121A0BE-C2E0-4F16-A3FA-658E54E7062A/74439558-CDFF-426C-92CD-ECDDACE971B0.ics";
 pub const EXAMPLE_CALENDAR_URL: &str = "https://my.server.com/remote.php/dav/calendars/john/a_calendar_name/";
 
+pub const ORG_NAME: &str = "My organisation";
+pub const PRODUCT_NAME: &str = "My CalDAV client";