Unhandled lines from iCal files are stored

src/ical/builder.rs

@@ -5,7 +5,11 @@ use std::error::Error;
 use chrono::{DateTime, Utc};
 use ics::properties::{Completed, Created, LastModified, PercentComplete, Status, Summary};
 use ics::{ICalendar, ToDo};
+use ics::components::Parameter as IcsParameter;
+use ics::components::Property as IcsProperty;
+use ical::property::Property as IcalProperty;
 
+use crate::Task;
 use crate::item::Item;
 use crate::task::CompletionStatus;
 use crate::settings::{ORG_NAME, PRODUCT_NAME};
@@ -16,22 +20,27 @@ fn ical_product_id() -> String {
 
 /// Create an iCal item from a `crate::item::Item`
 pub fn build_from(item: &Item) -> Result<String, Box<dyn Error>> {
-    let s_last_modified = format_date_time(item.last_modified());
+    match item {
+        Item::Task(t) => build_from_task(t),
+        _ => unimplemented!(),
+    }
+}
+
+pub fn build_from_task(task: &Task) -> Result<String, Box<dyn Error>> {
+    let s_last_modified = format_date_time(task.last_modified());
 
     let mut todo = ToDo::new(
-        item.uid(),
+        task.uid(),
         s_last_modified.clone(),
     );
 
-    item.creation_date().map(|dt|
+    task.creation_date().map(|dt|
         todo.push(Created::new(format_date_time(dt)))
     );
     todo.push(LastModified::new(s_last_modified));
-    todo.push(Summary::new(item.name()));
+    todo.push(Summary::new(task.name()));
 
-    match item {
-        Item::Task(t) => {
-            match t.completion_status() {
+    match task.completion_status() {
         CompletionStatus::Uncompleted => {
             todo.push(Status::needs_action());
         },
@@ -43,10 +52,11 @@ pub fn build_from(item: &Item) -> Result<String, Box<dyn Error>> {
             todo.push(Status::completed());
         }
     }
-        },
-        _ => {
-            unimplemented!()
-        },
+
+    // Also add fields that we have not handled
+    for ical_property in task.extra_parameters() {
+        let ics_property = ical_to_ics_property(ical_property.clone());
+        todo.push(ics_property);
     }
 
     let mut calendar = ICalendar::new("2.0", ical_product_id());
@@ -60,6 +70,21 @@ fn format_date_time(dt: &DateTime<Utc>) -> String {
 }
 
 
+fn ical_to_ics_property(prop: IcalProperty) -> IcsProperty<'static> {
+    let mut ics_prop = match prop.value {
+        Some(value) => IcsProperty::new(prop.name, value),
+        None =>        IcsProperty::new(prop.name, ""),
+    };
+    prop.params.map(|v| {
+        for (key, vec_values) in v {
+            let values = vec_values.join(";");
+            ics_prop.add(IcsParameter::new(key, values));
+        }
+    });
+    ics_prop
+}
+
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/ical/parser.rs

@@ -36,6 +36,8 @@ pub fn parse(content: &str, item_id: ItemId, sync_status: SyncStatus) -> Result<
             let mut last_modified = None;
             let mut completion_date = None;
             let mut creation_date = None;
+            let mut extra_parameters = Vec::new();
+
             for prop in &todo.properties {
                 match prop.name.as_str() {
                     "SUMMARY" => { name = prop.value.clone() },
@@ -67,7 +69,8 @@ pub fn parse(content: &str, item_id: ItemId, sync_status: SyncStatus) -> Result<
                         }
                     }
                     _ => {
-                        // This field is not supported.
+                        // This field is not supported. Let's store it anyway, so that we are able to re-create an identical iCal file
+                        extra_parameters.push(prop.clone());
                     }
                 }
             }
@@ -93,7 +96,7 @@ pub fn parse(content: &str, item_id: ItemId, sync_status: SyncStatus) -> Result<
                 true => CompletionStatus::Completed(completion_date),
             };
 
-            Item::Task(Task::new_with_parameters(name, uid, item_id, completion_status, sync_status, creation_date, last_modified))
+            Item::Task(Task::new_with_parameters(name, uid, item_id, completion_status, sync_status, creation_date, last_modified, extra_parameters))
         },
     };
 

src/task.rs

@@ -3,6 +3,7 @@
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 use chrono::{DateTime, Utc};
+use ical::property::Property;
 
 use crate::item::ItemId;
 use crate::item::SyncStatus;
@@ -51,6 +52,9 @@ pub struct Task {
     /// The display name of the task
     name: String,
 
+    /// Extra parameters that have not been parsed from the iCal file (because they're not supported (yet) by this crate).
+    /// They are needed to serialize this item into an equivalent iCal file
+    extra_parameters: Vec<Property>,
 }
 
 
@@ -66,13 +70,16 @@ impl Task {
         let new_completion_status = if completed {
                 CompletionStatus::Completed(Some(Utc::now()))
             } else { CompletionStatus::Uncompleted };
-        Self::new_with_parameters(name, new_uid, new_item_id, new_completion_status, new_sync_status, new_creation_date, new_last_modified)
+        let extra_parameters = Vec::new();
+        Self::new_with_parameters(name, new_uid, new_item_id, new_completion_status, new_sync_status, new_creation_date, new_last_modified, extra_parameters)
     }
 
     /// Create a new Task instance, that may be synced on the server already
     pub fn new_with_parameters(name: String, uid: String, id: ItemId,
                                completion_status: CompletionStatus,
-                               sync_status: SyncStatus, creation_date: Option<DateTime<Utc>>, last_modified: DateTime<Utc>) -> Self
+                               sync_status: SyncStatus, creation_date: Option<DateTime<Utc>>, last_modified: DateTime<Utc>,
+                               extra_parameters: Vec<Property>,
+                            ) -> Self
     {
         Self {
             id,
@@ -82,6 +89,7 @@ impl Task {
             sync_status,
             creation_date,
             last_modified,
+            extra_parameters,
         }
     }
 
@@ -93,6 +101,7 @@ impl Task {
     pub fn last_modified(&self) -> &DateTime<Utc> { &self.last_modified }
     pub fn creation_date(&self) -> Option<&DateTime<Utc>>   { self.creation_date.as_ref() }
     pub fn completion_status(&self) -> &CompletionStatus    { &self.completion_status }
+    pub fn extra_parameters(&self) -> &[Property]           { &self.extra_parameters }
 
     #[cfg(any(test, feature = "integration_tests"))]
     pub fn has_same_observable_content_as(&self, other: &Task) -> bool {