feat: finalize basic "AddEntry" to add from DOI

- Modify the `handle_new_entry_submission` method to accept additional arguments.
- Add error handling for failed inserts when appending to the file.
- Introduce a new method `append_to_file` to handle file appending logic.
- Update file handling to ensure new entries are correctly written to the specified file.

2 files changed, 26 insertions, 4 deletions

diff --git a/src/app.rs b/src/app.rs
index ae45355..a200448 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -108,7 +108,7 @@ impl App {
                             }
                             KeyCode::Enter => {
                                 // Handle submission of the new entry
-                                self.bibiman.handle_new_entry_submission();
+                                self.bibiman.handle_new_entry_submission(args);
                                 self.bibiman.close_popup();
                                 self.input_mode = false;
                             }
diff --git a/src/bibiman.rs b/src/bibiman.rs
index ee52207..e176bfa 100644
--- a/src/bibiman.rs
+++ b/src/bibiman.rs
@@ -28,6 +28,8 @@ use editor_command::EditorBuilder;
 use futures::executor::block_on;
 use ratatui::widgets::ScrollbarState;
 use std::fs;
+use std::fs::OpenOptions;
+use std::io::Write;
 use std::process::Command;
 use std::result::Result::Ok as AOk;
 use tui_input::Input;
@@ -121,20 +123,25 @@ impl Bibiman {
         self.popup_area.popup_kind = Some(PopupKind::AddEntry);
     }
 
-    pub fn handle_new_entry_submission(&mut self) {
+    pub fn handle_new_entry_submission(&mut self, args: &CLIArgs) {
         let new_entry_title = self.popup_area.add_entry_input.trim();
         let doi2bib = doi2bib::Doi2Bib::new().unwrap();
         let new_entry_future = doi2bib.resolve_doi(new_entry_title);
         let new_entry = block_on(new_entry_future);
 
         if let AOk(entry) = new_entry {
-            println!("New entry: {:?}", entry);
-            // Add logic here to integrate the new entry into your application
+            // TODO: Add error handling for failed insert
+            if self.append_to_file(args, &entry.to_string()).is_err() {
+                self.popup_area.popup_kind = Some(PopupKind::MessageError);
+                self.popup_area.popup_message = "Failed to add new entry".to_string();
+            }
+        // TODO: Add error handling for failed DOI lookup
         } else {
             self.popup_area.popup_kind = Some(PopupKind::MessageError);
             self.popup_area.popup_message = "Failed to add new entry".to_string();
         }
     }
+
     pub fn close_popup(&mut self) {
         // Reset all popup fields to default values
         self.popup_area = PopupArea::default();
@@ -414,6 +421,21 @@ impl Bibiman {
         Ok(())
     }
 
+    /// Appends a string to the appropriate BibLaTeX file.
+    pub fn append_to_file(&mut self, args: &CLIArgs, content: &str) -> Result<()> {
+        // Determine the file path to append to
+        let file_path = args.files.first().unwrap();
+        // Open the file in append mode
+        let mut file = OpenOptions::new().append(true).open(file_path).unwrap();
+        // Optionally, add a newline before the content
+        file.write_all(b"\n")?;
+        // Write the content to the file
+        file.write_all(content.as_bytes())?;
+        // Update the database and the lists to reflect the new content
+        self.update_lists(args);
+        Ok(())
+    }
+
     // Search entry list
     pub fn search_entries(&mut self) {
         // Use snapshot of entry list saved when starting the search