Create the folders for the Sqlite blob files if they do not exist. (#39)

* Create the folders for the Sqlite blob files if they do not exist.

As mentioned in bagetter/BaGette#38 under some special configurations Sqlite failed with a "folder not found" exception.

* Simplified folder creation logic.

* Simply create the path given by the Database::ConnectionString config.

src/BaGetter.Database.Sqlite/BaGetter.Database.Sqlite.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
-
+    <Nullable>enable</Nullable>
     <PackageTags>NuGet</PackageTags>
     <Description>The libraries to host BaGetter on SQLite.</Description>
   </PropertyGroup>

src/BaGetter.Database.Sqlite/SqliteContext.cs

@@ -1,3 +1,8 @@
+using System;
+using System.IO;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
 using BaGetter.Core;
 using Microsoft.Data.Sqlite;
 using Microsoft.EntityFrameworkCore;
@@ -45,5 +50,29 @@ protected override void OnModelCreating(ModelBuilder builder)
                 .Property(f => f.Moniker)
                 .HasColumnType("TEXT COLLATE NOCASE");
         }
+
+        public override async Task RunMigrationsAsync(CancellationToken cancellationToken)
+        {
+            if (Database.GetDbConnection() is SqliteConnection connection)
+            {
+                /* Create the folder of the Sqlite blob if it does not exist. */
+                CreateSqliteDataSourceDirectory(connection);
+            }
+
+            await base.RunMigrationsAsync(cancellationToken);
+        }
+
+        /// <summary>
+        /// Creates directories specified in the Database::ConnectionString config for the Sqlite database file.
+        /// </summary>
+        /// <param name="connection">Instance of the <see cref="SqliteConnection"/>.</param>
+        private static void CreateSqliteDataSourceDirectory(SqliteConnection connection)
+        {
+            var pathToCreate = Path.GetDirectoryName(connection.DataSource);
+
+            if (pathToCreate is null) return;
+
+            Directory.CreateDirectory(pathToCreate);
+        }
     }
 }

src/Directory.Build.props

@@ -15,7 +15,7 @@
   <!-- Compiler properties -->
   <PropertyGroup>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <LangVersion>7.2</LangVersion>
+    <LangVersion>latest</LangVersion>
 
     <!-- Don't warn if there are missing XMl comment for publicly visible type or member-->
     <NoWarn>$(NoWarn);1591</NoWarn>