Add Unpublished source type

Signed-off-by: trivernis <trivernis@protonmail.com>

src/bibliography/bib_types/mod.rs

@@ -6,6 +6,7 @@ use crate::bibliography::bib_types::in_collection::InCollection;
 use crate::bibliography::bib_types::manual::Manual;
 use crate::bibliography::bib_types::tech_report::TechReport;
 use crate::bibliography::bib_types::thesis::Thesis;
+use crate::bibliography::bib_types::unpublished::Unpublished;
 use chrono::{Date, Local};
 
 pub mod article;
@@ -16,6 +17,7 @@ pub mod in_collection;
 pub mod manual;
 pub mod tech_report;
 pub mod thesis;
+pub mod unpublished;
 
 pub type LocalDate = Date<Local>;
 
@@ -30,7 +32,7 @@ pub enum BibliographyType {
     Manual(Manual),
     Thesis(Thesis),
     TechReport(TechReport),
-    Unpublished,
+    Unpublished(Unpublished),
     Misc,
     Url,
     Repository,

src/bibliography/bib_types/unpublished.rs

@@ -0,0 +1,20 @@
+use crate::bibliography::bib_types::LocalDate;
+
+/// A source that is not formally published
+#[derive(Clone, Debug)]
+pub struct Unpublished {
+    pub author: String,
+    pub title: String,
+    pub date: Option<LocalDate>,
+}
+
+impl Unpublished {
+    /// Creates a new source of type unpublished with only the mandatory fields filled
+    pub fn new(author: String, title: String) -> Self {
+        Self {
+            author,
+            title,
+            date: None,
+        }
+    }
+}