initial commit

PhotoRenamer.Base/FilesHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace PhotoRenamer.Base
+{
+
+    public static class FilesHelper
+    {
+        private static readonly string[] SupportedFileExtensions = {".jpg", ".cr2", ".mp4"};
+
+        public static IEnumerable<string> FindSupportedFilesRecursively(string path)
+        {
+            var files = Directory.EnumerateFiles(path, "*", SearchOption.AllDirectories);
+            foreach (var file in files)
+            {
+                var fileExt = Path.GetExtension(file);
+                if(fileExt == null) continue;
+                foreach (var supportedFileExtension in SupportedFileExtensions)
+                {
+                    if (fileExt.Equals(supportedFileExtension, StringComparison.InvariantCultureIgnoreCase)) yield return file;
+                }
+            }
+        }
+    }
+}

PhotoRenamer.Base/PhotoRenamer.Base.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="ExifLibNet" Version="2.1.1" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.8">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+</Project>