Extract GetSharedImageSrc.

Author: pawchen

converter/generator/DocToStaticPagesTransformer.cs

@@ -152,6 +152,9 @@ protected internal override bool TryResolveHref(string href, string sourceDir, o
         return false;
     }
 
+    protected override string GetSharedImageSrc(string path, string fileName)
+        => $"/books/images/{fileName}?v={FileHash.StringFromFile(path)}";
+
     protected internal override bool TryResolveSrc(string src, string sourceDir, out string result, out (string src, string dst)? copy)
     {
         if (src.StartsWith("../images/"))

converter/generator/DocTransformer.cs

@@ -24,7 +24,7 @@ internal abstract partial class DocTransformer : IDocTransformer
 
     protected Dictionary<string, string> MovedPages => field ??= GetMovedPages();
 
-    protected static Dictionary<string, string> SharedImages => field ??= GetSharedImages();
+    protected Dictionary<string, string> SharedImages => field ??= GetSharedImages();
 
     private readonly ProblemRecorder Problems;
 
@@ -76,19 +76,21 @@ private Dictionary<string, string> GetMovedPages()
         ?.ToDictionary(StringComparer.OrdinalIgnoreCase) ?? [];
     }
 
-    private static Dictionary<string, string> GetSharedImages()
+    private Dictionary<string, string> GetSharedImages()
     {
         var images = new Dictionary<string, string>();
 
         foreach (var imgFile in Directory.EnumerateFiles(Path.Combine(Template.WebRootPath, "books/images")))
         {
             var fileName = Path.GetFileName(imgFile);
-            images.Add(fileName, $"/books/images/{fileName}?v={FileHash.StringFromFile(imgFile)}");
+            images.Add(fileName, GetSharedImageSrc(imgFile, fileName));
         }
 
         return images;
     }
 
+    protected abstract string GetSharedImageSrc(string path, string fileName);
+
     public virtual async Task TransformAsync()
     {
         foreach (var language in AvailableLanguages)