[wip] handle error early instead of nil-threading

cider-util.el

@@ -518,7 +518,7 @@ Any other value is just returned."
 
 ;;; Files
 (defun cider--ensure-executable (file)
-  (with-demoted-errors "Error trying to make file executable:\n %s"
+  (with-demoted-errors "Error while trying to make file executable:\n %s"
     (when (or (file-executable-p file)
               (and (set-file-modes file "u+x")
                    (file-executable-p file)))
@@ -529,38 +529,36 @@ Any other value is just returned."
    (concat ".cider__" (file-name-nondirectory file) "__")))
 
 (defun cider--make-nearby-temp-copy (file)
-  (with-demoted-errors "Failed to copy to temporary file:\n %s"
-    (let* ((default-directory (or (clojure-project-dir) default-directory))
-           ;; Note: (temporary-file-directory) uses `default-directory' as fallback.
-           (new-file (file-name-concat (temporary-file-directory)
-                                       (cider--make-temp-name file))))
-      (copy-file file new-file :exists-ok nil nil :keep-permissions)
-      new-file)))
+  (let* ((default-directory (or (clojure-project-dir) default-directory))
+         ;; Note: (temporary-file-directory) uses `default-directory' as fallback.
+         (new-file (file-name-concat (temporary-file-directory)
+                                     (cider--make-temp-name file))))
+    (copy-file file new-file :exists-ok nil nil :keep-permissions)
+    new-file))
 
 (defun cider--inject-self-delete (bash-script)
-  (with-demoted-errors "Failed to inject self-delete string:\n %s"
-    (let (;; Don't create any temporary files.
-          (remote-file-name-inhibit-locks t)
-          (remote-file-name-inhibit-auto-save-visited t)
-          (backup-inhibited t)
-          (auto-save-default nil)
-          ;; Disable version-control check
-          (vc-handled-backends nil))
-      (with-temp-buffer
-        (insert-file-contents bash-script)
-        ;; inject after the first line, assuming it is the shebang
-        (goto-char (point-min))
-        (skip-chars-forward "^\n")
-        (insert "\n")
-        (insert (format
-                 "trap 'ARG=$?
+  (let (;; Don't create any temporary files.
+        (remote-file-name-inhibit-locks t)
+        (remote-file-name-inhibit-auto-save-visited t)
+        (backup-inhibited t)
+        (auto-save-default nil)
+        ;; Disable version-control check
+        (vc-handled-backends nil))
+    (with-temp-buffer
+      (insert-file-contents bash-script)
+      ;; inject after the first line, assuming it is the shebang
+      (goto-char (point-min))
+      (skip-chars-forward "^\n")
+      (insert "\n")
+      (insert (format
+               "trap 'ARG=$?
                  rm -v %s
                  echo \"cider: Cleaned up temporary script after use.\"
                  exit $ARG
                ' EXIT"
-                 (file-local-name bash-script)))
-        (write-file bash-script))
-      bash-script)))
+               (file-local-name bash-script)))
+      (write-file bash-script))
+    bash-script))
 
 
 ;;; Help mode

cider.el

@@ -438,10 +438,11 @@ use.  The search for <remote-tempdir> is handled by tramp and falls back to
               (location (concat cider-dir name))
               (script (cider--ensure-executable location)))
     (if (file-remote-p default-directory)
-        (thread-first
-          (cider--make-nearby-temp-copy script)
-          (cider--ensure-executable)
-          (cider--inject-self-delete))
+        (with-demoted-errors "cider: Failed to init enrich-classpath on remote: %s"
+          (thread-first
+            (cider--make-nearby-temp-copy script)
+            (cider--ensure-executable)
+            (cider--inject-self-delete)))
       script)))
 
 (defun cider--jack-in-resolve-command-enrich (project-type)