website - improve warning when alias redirection would overwrite file

news/changelog-1.8.md

@@ -1,3 +1,7 @@
 All changes included in 1.8:
 
+## Projects
 
+### `website`
+
+- ([#12551](https://github.com/quarto-dev/quarto-cli/pull/12551)): Improve warning issued when `aliases` would overwrite an existing document.

src/project/types/website/website-aliases.ts

@@ -106,10 +106,17 @@ export async function updateAliases(
 
     // Write the redirect file
     if (allOutputFiles.find((outputFile) => outputFile === targetFile)) {
-      // Do not, this is the same name as an output file!
-      warning(
-        `Aliases that you have created would overwrite the output file ${targetFile}. The aliases file was not created.`,
-      );
+      for (
+        const offendingAlias of targetHrefs.filter(
+          (targetHref) =>
+            targetHref.href ===
+              relative(dirname(targetHref.outputFile), targetFile),
+        )
+      ) {
+        warning(
+          `Requested alias ${targetFile} -> ${offendingAlias.outputFile} would overwrite the target. Skipping.`,
+        );
+      }
     } else {
       // Write, this is a safe file
       writeMultipleRedirectPage(targetFile, redirects);