Added searching by lower or card name

Also added help strings

scryfall_deser/src/db.rs

@@ -1,4 +1,5 @@
 use rusqlite;
+use std::fmt;
 use std::fs;
 use std::path::PathBuf;
 use std::str::SplitWhitespace;
@@ -88,18 +89,28 @@ pub struct DbCard {
     pub scryfall_uri: String,
 }
 
-pub fn get_card_by_name(name: &str) -> DbCard {
+pub enum GetNameType {
+    Name,
+    LowercaseName,
+}
+
+pub fn get_card_by_name(name: &str, name_type: GetNameType) -> Option<DbCard> {
     let sqlite_file = get_local_data_sqlite_file();
     let conn = rusqlite::Connection::open(sqlite_file).unwrap();
-    let mut stmt = conn
-        .prepare(
+    let sql = match name_type {
+        GetNameType::Name => {
             "SELECT name, type_line, oracle_text, power_toughness, loyalty, mana_cost, scryfall_uri
-             FROM cards WHERE name = (?1)",
-        )
-        .unwrap();
+             FROM cards WHERE name = (?1)"
+        }
+        GetNameType::LowercaseName => {
+            "SELECT name, type_line, oracle_text, power_toughness, loyalty, mana_cost, scryfall_uri
+             FROM cards WHERE lowercase_name = (?1)"
+        }
+    };
+    let mut stmt = conn.prepare(sql).unwrap();
     let mut rows = stmt.query([name]).unwrap();
-    let card = match rows.next().unwrap() {
-        Some(row) => DbCard {
+    match rows.next().unwrap() {
+        Some(row) => Some(DbCard {
             name: row.get(0).unwrap(),
             type_line: row.get(1).unwrap(),
             oracle_text: row.get(2).unwrap(),
@@ -107,12 +118,9 @@ pub fn get_card_by_name(name: &str) -> DbCard {
             loyalty: row.get(4).unwrap(),
             mana_cost: row.get(5).unwrap(),
             scryfall_uri: row.get(6).unwrap(),
-        },
-        None => {
-            panic!("{} isn't a card that exists", name);
-        }
-    };
-    card
+        }),
+        None => None,
+    }
 }
 
 const CREATE_CARDS_TABLE_SQL: &str = "