Sort available kernelspecs; guess with ^; use guessing in jupyter-run-repl

jupyter-kernelspec.el

@@ -45,10 +45,10 @@
   "Get the available kernelspecs.
 Return an alist mapping kernel names to (DIRECTORY . PLIST) pairs
 where DIRECTORY is the resource directory of the kernel and PLIST
-is its kernelspec plist.  The alist is formed by parsing the
-output of the shell command
+is its kernelspec plist.  The alist is formed by parsing and
+sorting the output of the shell command
 
-    jupyter kernelspec list
+    jupyter kernelspec list --json
 
 By default the available kernelspecs are cached.  To force an
 update of the cached kernelspecs, give a non-nil value to
@@ -64,14 +64,16 @@ each DIRECTORY will be a remote file name."
                        (or (jupyter-command "kernelspec" "list" "--json")
                            (error "Can't obtain kernelspecs from jupyter shell command")))
                       :kernelspecs)))
-          (puthash
-           host (cl-loop
-                 for (name spec) on specs by #'cddr
-                 for dir = (concat (unless (equal host "local") host)
-                                   (plist-get spec :resource_dir))
-                 collect (cons (substring (symbol-name name) 1)
-                               (cons dir (plist-get spec :spec))))
-           jupyter--kernelspecs)))))
+          (puthash host
+		   (sort (cl-loop
+			  for (name spec) on specs by #'cddr
+			  for dir = (concat (unless (equal host "local") host)
+					    (plist-get spec :resource_dir))
+			  collect (cons (substring (symbol-name name) 1)
+					(cons dir (plist-get spec :spec))))
+			 (lambda (x y)
+			   (string< (car x) (car y))))
+		   jupyter--kernelspecs)))))
 
 (defun jupyter-get-kernelspec (name &optional refresh)
   "Get the kernelspec for a kernel named NAME.
@@ -103,12 +105,12 @@ Optional argument REFRESH has the same meaning as in
    (or specs (jupyter-available-kernelspecs refresh))))
 
 (defun jupyter-guess-kernelspec (name &optional specs refresh)
-  "Return the first kernelspec matching NAME.
+  "Return the first kernelspec starting with NAME.
 Raise an error if no kernelspec could be found.
 
 SPECS and REFRESH have the same meaning as in
 `jupyter-find-kernelspecs'."
-  (or (car (jupyter-find-kernelspecs name specs refresh))
+  (or (car (jupyter-find-kernelspecs (format "^%s" name) specs refresh))
       (error "No valid kernelspec for kernel name (%s)" name)))
 
 (defun jupyter-completing-read-kernelspec (&optional specs refresh)

jupyter-repl.el

@@ -2097,7 +2097,7 @@ completing all of the above.")
 ;;;###autoload
 (defun jupyter-run-repl (kernel-name &optional repl-name associate-buffer client-class display)
   "Run a Jupyter REPL connected to a kernel with name, KERNEL-NAME.
-KERNEL-NAME will be passed to `jupyter-find-kernelspecs' and the
+KERNEL-NAME will be passed to `jupyter-guess-kernelspec' and the
 first kernel found will be used to start the new kernel.
 
 With a prefix argument give a new REPL-NAME for the REPL.
@@ -2128,10 +2128,6 @@ command on the host."
                      t nil t))
   (or client-class (setq client-class 'jupyter-repl-client))
   (jupyter-error-if-not-client-class-p client-class 'jupyter-repl-client)
-  (unless (called-interactively-p 'interactive)
-    (or (when-let* ((name (caar (jupyter-find-kernelspecs kernel-name))))
-          (setq kernel-name name))
-        (error "No kernel found for prefix (%s)" kernel-name)))
   ;; For `jupyter-start-new-kernel', we don't require this at top-level since
   ;; there are many ways to interact with a kernel, e.g. through a notebook
   ;; server, and we don't want to load any unnecessary files.

test/jupyter-test.el

@@ -1912,6 +1912,24 @@ next(x"))))))
                     font-lock-extend-region-functions)))
         (font-lock-ensure)))))
 
+(ert-deftest jupyter-available-kernelspecs-sorting ()
+  :tags '(repl)
+  (jupyter-test-with-some-kernelspecs '("foo_qux" "qux" "bar_qux")
+    (let ((result (mapcar #'car (jupyter-available-kernelspecs t))))
+      (should (equal result (sort (copy-sequence result) #'string<))))))
+
+(ert-deftest jupyter-run-repl-issue-371 ()
+  :tags '(repl)
+  (jupyter-test-with-some-kernelspecs '("foo_qux" "qux" "bar_qux")
+    (let ((client))
+      (unwind-protect
+	  (progn
+	    (setq client (jupyter-run-repl "qux"))
+	    (should (equal (plist-get (jupyter-session-conn-info (oref client session))
+				      :kernel_name)
+			   "qux")))
+	(jupyter-test-kill-buffer (oref client buffer))))))
+
 ;;; `org-mode'
 
 (defvar org-babel-jupyter-resource-directory nil)

test/test-helper.el

@@ -365,8 +365,36 @@ For `url-retrieve', the callback will be called with a nil status."
              (progn ,@body)
            (jupyter-api-shutdown-kernel ,server ,id))))))
 
+(defmacro jupyter-test-with-some-kernelspecs (names &rest body)
+  "Execute BODY in the context where extra kernelspecs with NAMES are available.
+
+Those kernelspecs will be created in a temporary dir, which will
+be presented to Jupyter process via JUPYTER_PATH environemnt
+variable."
+  (declare (indent 1) (debug (listp body)))
+  `(unwind-protect
+       (let ((jupyter-extra-dir (make-temp-file "jupyter-extra-dir" 'directory)))
+	 (jupyter-test-create-some-kernelspecs ,names jupyter-extra-dir)
+	 (setenv "JUPYTER_PATH" jupyter-extra-dir)
+	 ,@body)
+     (setenv "JUPYTER_PATH")))
+
 ;;; Functions
 
+(defun jupyter-test-create-some-kernelspecs (kernel-names data-dir)
+  "In DATA-DIR, create kernelspecs according to KERNEL-NAMES list.
+
+The only difference between them will be their names."
+  (let ((argv (vector "python" "-m" "ipykernel_launcher" "-f" "{connection_file}"))
+	(save-silently t))
+    (dolist (name kernel-names)
+      (let ((kernel-dir (format "%s/kernels/%s" data-dir name)))
+	(make-directory kernel-dir t)
+	(append-to-file (json-serialize
+			 `(:argv ,argv :display_name ,name :language "python"))
+			nil
+			(format "%s/kernel.json" kernel-dir))))))
+
 (defun jupyter-test-ipython-kernel-version (spec)
   "Return the IPython kernel version string corresponding to SPEC.
 Assumes that SPEC is a kernelspec for a Python kernel and