Add a function to help eliminating Biber exit code 2

README.org

@@ -615,6 +615,7 @@ defined in this Org file.
         (set-default-face-height :no-manual t)
         "LaTeX"
         (TeX-brace-count-line-override :no-manual t)
+        (biber-delete-cache :no-manual t)
         (toggle-TeX-brace-count-line-override :no-manual t)
         (update-lualatex-opentype-font-name-database :no-manual t)
         "Org"
@@ -1825,6 +1826,21 @@ valid directories and files.  In an [[https://orgmode.org/][Org-mode]] buffer th
 3. [[https://github.com/yuchenlin/rebiber][Rebiber: A tool for normalizing bibtex with official info]]
 4. [[https://github.com/josephwright/biblatex-phys][A biblatex implementation of the AIP and APS bibliography style]]
 
+#+caption[Delete =Biber= cache to get rid of =Biber= exit code 2]:
+#+caption: Delete =Biber= cache to get rid of =Biber= exit code 2.
+#+name: lst:delete-biber-cache
+#+begin_src emacs-lisp
+  (with-eval-after-load 'emacs
+    ;; https://tex.stackexchange.com/a/579356 answers
+    ;; "How to solve Biber exiting with error code 2 but no error messages?"
+    (defun biber-delete-cache ()
+      "Delete the `Biber' cache to get rid of `Biber' exit code 2."
+      (cl-destructuring-bind (exit-code output)
+          (shell-command-with-exit-code "rm" "-rf" "$(biber --cache)")
+        (if (= 0 exit-code) (message "%s") (string-trim output)
+            (error "%s" (string-trim output))))))
+#+end_src
+
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