Overhaul file erorr handling

src/cli/done.rs

@@ -5,12 +5,20 @@ use crate::files::commands::Done;
 use crate::files::Files;
 
 use super::error::Result;
+use super::layout::line::LineLayout;
 
-pub fn mark_done(files: &mut Files, entry: &Entry, now: NaiveDateTime) -> Result<()> {
+pub fn mark_done(
+    files: &mut Files,
+    entries: &[Entry],
+    layout: &LineLayout,
+    number: usize,
+    now: NaiveDateTime,
+) -> Result<()> {
+    let entry = &entries[layout.look_up_number(number)?];
     let done = Done {
         date: entry.dates.map(|dates| dates.into()),
         done_at: now.date(),
     };
-    files.add_done(entry.source, done)?;
+    files.add_done(number, entry.source, done)?;
     Ok(())
 }