Locate multiple ports for a single project

Searching for a nrepl port to connect to would return a maximum of one
port per project, ignoring any others that you might want to connect
to. This creates a case where when connecting to a shadow-cljs nrepl
server the port is not presented to you as a completion when you
already have another nrepl server running.

This commit changes nrepl-extract-port to nrepl-extract-ports and the
return type from a single port to a list of ports (including nils
where a specific project type nrepl port file doesn't exist) to
provide the full view of nrepl servers that are available in the
project, and then the cider-locate-running-nrepl-ports fn is changed
to accommodate that.

This fixes #3140.

Author: danmidwood

CHANGELOG.md

@@ -20,6 +20,7 @@
 ### Bugs fixed
 
 * [#3235](https://github.com/clojure-emacs/cider/issues/3235): Check `name` is a TRAMP file in `cider--client-tramp-filename` via `tramp-tramp-file-p`.
+- [#3234](https://github.com/clojure-emacs/cider/pull/3234) Autocomplete multiple available ports on nRepl connect.
 
 ## 1.4.1 (2022-05-25)
 

cider.el

@@ -1625,10 +1625,11 @@ of remote SSH hosts."
 When DIR is non-nil also look for nREPL port files in DIR.  Return a list
 of list of the form (project-dir port)."
   (let* ((paths (cider--running-nrepl-paths))
-         (proj-ports (mapcar (lambda (d)
-                               (when-let* ((port (and d (nrepl-extract-port (cider--file-path d)))))
-                                 (list (file-name-nondirectory (directory-file-name d)) port)))
-                             (cons (clojure-project-dir dir) paths))))
+         (proj-ports (apply #'append
+                            (mapcar (lambda (d)
+                                      (mapcar (lambda (p) (list (file-name-nondirectory (directory-file-name d)) p))
+                                              (and d (nrepl-extract-ports (cider--file-path d)))))
+                                    (cons (clojure-project-dir dir) paths)))))
     (seq-uniq (delq nil proj-ports))))
 
 (defun cider--running-nrepl-paths ()

nrepl-client.el

@@ -237,6 +237,16 @@ PARAMS is as in `nrepl-make-buffer-name'."
       (nrepl--port-from-file (expand-file-name "target/repl-port" dir))
       (nrepl--port-from-file (expand-file-name ".shadow-cljs/nrepl.port" dir))))
 
+(defun nrepl-extract-ports (dir)
+  "Read ports from applicable repl-port files in directory DIR."
+  (delq nil
+        (list (nrepl--port-from-file (expand-file-name "repl-port" dir))
+              (nrepl--port-from-file (expand-file-name ".nrepl-port" dir))
+              (nrepl--port-from-file (expand-file-name "target/repl-port" dir))
+              (nrepl--port-from-file (expand-file-name ".shadow-cljs/nrepl.port" dir)))))
+
+(make-obsolete 'nrepl-extract-port 'nrepl-extract-ports "1.4.2")
+
 (defun nrepl--port-from-file (file)
   "Attempts to read port from a file named by FILE."
   (when (file-exists-p file)