docs: Update edit command docs

Signed-off-by: Awiteb <a@4rs.nl>

docs/commands/edit.md

@@ -55,6 +55,10 @@ custom fields.
 For secrets like the password and TOTP secret, you can provide them as arguments
 or you will be prompted for them.
 
+## Field removal
+If you want to remove a field from the vault, you can provide an empty value for
+it, e.g. `-o ""`.
+
 ## Custom fields
 If you want to add a custom field to the vault, you can use the `-c, --custom`
 option, and provide the key-value pair. If you want to delete a custom field,

src/cli/edit_command.rs

@@ -82,24 +82,44 @@ impl LprsCommand for Edit {
         if let Some(new_name) = self.name {
             vault.name = new_name;
         }
-        if self.password.is_some() {
+        if let Some(ref new_password) = self.password {
+            if new_password.as_deref().is_some_and(|s| s.is_empty()) {
+                vault.password = None;
+            } else {
                 vault.password = utils::user_secret(self.password, "New vault password:", false)?;
             }
+        }
         if let Some(totp_secret) = utils::user_secret(self.totp_secret, "TOTP Secret:", false)? {
+            if totp_secret.is_empty() {
+                vault.totp_secret = None;
+            } else {
                 cipher::base32_decode(&totp_secret).map_err(|_| {
                     LprsError::Base32("Invalid TOTP secret, must be valid base32 string".to_owned())
                 })?;
                 vault.totp_secret = Some(totp_secret);
             }
+        }
         if let Some(new_username) = self.username {
+            if new_username.is_empty() {
+                vault.username = None;
+            } else {
                 vault.username = Some(new_username);
             }
+        }
         if let Some(new_service) = self.service {
+            if new_service.is_empty() {
+                vault.service = None;
+            } else {
                 vault.service = Some(new_service);
             }
+        }
         if let Some(new_note) = self.note {
+            if new_note.is_empty() {
+                vault.note = None;
+            } else {
                 vault.note = Some(new_note);
             }
+        }
         utils::apply_custom_fields(&mut vault.custom_fields, self.custom_fields);
 
         vault_manager.try_export()