Support PHPStan editor-mode

README.org

@@ -5,9 +5,14 @@
 #+END_HTML
 Emacs interface to [[https://github.com/phpstan/phpstan][PHPStan]], includes checker for [[http://www.flycheck.org/en/latest/][Flycheck]].
 ** Support version
-- Emacs 25+
+- Emacs 26+
 - PHPStan latest/dev-master (NOT support 0.9 seriese)
 - PHP 7.1+ or Docker runtime
+
+> [!TIP]
+> This package provides support for the [editor mode](https://phpstan.org/user-guide/editor-mode) that will be added in PHPStan 2.1.17 and 1.12.27.
+> **We strongly recommend that you always update to the latest PHPStan.**
+
 ** How to install
 *** Install from MELPA
  1. If you have not set up MELPA, see [[https://melpa.org/#/getting-started][Getting Started - MELPA]].

flycheck-phpstan.el

@@ -77,6 +77,11 @@ passed to `flycheck-finish-checker-process'."
                (string-match-p flycheck-phpstan--nofiles-message output))
     (funcall next checker exit-status files output callback cwd)))
 
+(defcustom flycheck-phpstan-fallback-to-original-analysis-if-editor-mode-unavailable t
+  "If non-NIL, analyze the original file when PHPStan editor mode is unavailable."
+  :type 'boolean
+  :safe #'booleanp)
+
 (defun flycheck-phpstan--enabled-and-set-variable ()
   "Return path to phpstan configure file, and set buffer execute in side effect."
   (let ((enabled (phpstan-enabled)))
@@ -139,13 +144,23 @@ passed to `flycheck-finish-checker-process'."
                                                           nil 'error text
                                                           :filename file))))
 
+(defun flycheck-phpstan-analyze-original (original)
+  "Return non-NIL if ORIGINAL is NIL, fallback is enabled, and buffer is modified."
+  (and (null original)
+       flycheck-phpstan-fallback-to-original-analysis-if-editor-mode-unavailable
+       (buffer-modified-p)))
+
 (flycheck-define-checker phpstan
   "PHP static analyzer based on PHPStan."
-  :command ("php" (eval (phpstan-get-command-args :format "json"))
-            (eval (if (or (buffer-modified-p) (not buffer-file-name))
-                      (phpstan-normalize-path
-                       (flycheck-save-buffer-to-temp #'flycheck-temp-file-inplace))
-                    buffer-file-name)))
+  :command ("php"
+            (eval
+             (phpstan-get-command-args
+              :format "json"
+              :editor (list
+                       :analyze-original #'flycheck-phpstan-analyze-original
+                       :original-file buffer-file-name
+                       :temp-file (lambda () (flycheck-save-buffer-to-temp #'flycheck-temp-file-system))
+                       :inplace (lambda () (flycheck-save-buffer-to-temp #'flycheck-temp-file-inplace))))))
   :working-directory (lambda (_) (phpstan-get-working-dir))
   :enabled (lambda () (flycheck-phpstan--enabled-and-set-variable))
   :error-parser flycheck-phpstan-parse-output

flymake-phpstan.el

@@ -52,6 +52,11 @@
   :type 'boolean
   :group 'flymake-phpstan)
 
+(defcustom flycheck-phpstan-fallback-to-original-analysis-if-editor-mode-unavailable t
+  "If non-NIL, analyze the original file when PHPStan editor mode is unavailable."
+  :type 'boolean
+  :safe #'booleanp)
+
 (defvar-local flymake-phpstan--proc nil)
 
 (defun flymake-phpstan-make-process (root command-args report-fn source)
@@ -88,21 +93,36 @@
             (kill-buffer (process-buffer proc))))
          (code (user-error "PHPStan error (exit status: %s)" code)))))))
 
+(defun flymake-phpstan-analyze-original (original)
+  "Return non-NIL if ORIGINAL is NIL, fallback is enabled, and buffer is modified."
+  (and (null original)
+       flymake-phpstan-fallback-to-original-analysis-if-editor-mode-unavailable
+       (buffer-modified-p)))
+
+(defun flymake-phpstan--create-temp-file ()
+  "Create temp file and return the path."
+  (phpstan-normalize-path
+   (flymake-proc-init-create-temp-buffer-copy 'flymake-proc-create-temp-inplace)))
+
 (defun flymake-phpstan (report-fn &rest _ignored-args)
   "Flymake backend for PHPStan report using REPORT-FN."
   (let ((command-args (phpstan-get-command-args :include-executable t)))
     (unless (car command-args)
       (user-error "Cannot find a phpstan executable command"))
     (when (process-live-p flymake-phpstan--proc)
       (kill-process flymake-phpstan--proc))
-    (let ((source (current-buffer))
-          (target-path (if (or (buffer-modified-p) (not buffer-file-name))
-                           (phpstan-normalize-path
-                            (flycheck-save-buffer-to-temp #'flycheck-temp-file-inplace))
-                         buffer-file-name)))
+    (let* ((source (current-buffer))
+           (args (phpstan-get-command-args
+                  :include-executable t
+                  :format "raw"
+                  :editor (list
+                           :analyze-original #'flymake-phpstan-analyze-original
+                           :original-file buffer-file-name
+                           :temp-file #'flymake-phpstan--create-temp-file
+                           :inplace #'flymake-phpstan--create-temp-file))))
       (save-restriction
         (widen)
-        (setq flymake-phpstan--proc (flymake-phpstan-make-process (php-project-get-root-dir) (append command-args (list "--" target-path)) report-fn source))
+        (setq flymake-phpstan--proc (flymake-phpstan-make-process (php-project-get-root-dir) args report-fn source))
         (process-send-region flymake-phpstan--proc (point-min) (point-max))
         (process-send-eof flymake-phpstan--proc)))))
 
@@ -115,7 +135,7 @@
       (flymake-mode 1)
       (when flymake-phpstan-disable-c-mode-hooks
         (remove-hook 'flymake-diagnostic-functions #'flymake-cc t))
-      (add-hook 'flymake-diagnostic-functions #'flymake-phpstan nil t))))
+      (add-hook 'flymake-diagnostic-functions #'flymake-phpstan nil 'local))))
 
 (provide 'flymake-phpstan)
 ;;; flymake-phpstan.el ends here

phpstan.el

@@ -166,11 +166,20 @@ have unexpected behaviors or performance implications."
   "Lists identifiers prohibited from being added to @phpstan-ignore tags."
   :type '(repeat string))
 
+(defcustom phpstan-activate-editor-mode nil
+  "Controls how PHPStan's editor mode is activated."
+  :local t
+  :type '(choice (const :tag "Automatic (based on version)" nil)
+                 (const :tag "Editor mode will be actively enabled, regardless of the PHPStan version." 'enabled)
+                 (const :tag "Editor mode will be explicitly disabled." 'disabled)))
+
 (defvar-local phpstan--use-xdebug-option nil)
 
 (defvar-local phpstan--ignorable-errors '())
 (defvar-local phpstan--dumped-types '())
 
+(defvar phpstan-executable-versions-alist '())
+
 ;;;###autoload
 (progn
   (defvar-local phpstan-working-dir nil
@@ -479,7 +488,7 @@ it returns the value of `SOURCE' as it is."
        ((executable-find "phpstan") (list (executable-find "phpstan")))
        (t (error "PHPStan executable not found")))))))
 
-(cl-defun phpstan-get-command-args (&key include-executable use-pro args format options config verbose)
+(cl-defun phpstan-get-command-args (&key include-executable use-pro args format options config verbose editor)
   "Return command line argument for PHPStan."
   (let ((executable-and-args (phpstan-get-executable-and-args))
         (config (or config (phpstan-normalize-path (phpstan-get-config-file))))
@@ -510,6 +519,15 @@ it returns the value of `SOURCE' as it is."
                            "--xdebug"))
              (list phpstan--use-xdebug-option))
             (phpstan-use-xdebug-option (list "--xdebug")))
+           (when editor
+             (let ((original-file (plist-get editor :original-file)))
+               (if (phpstan-editor-mode-available-p (car (phpstan-get-executable-and-args)))
+                   (list "--tmp-file" (funcall (plist-get editor :temp-file))
+                         "--instead-of" original-file
+                         "--" original-file)
+                 (if (funcall (plist-get editor :analyze-original) original-file)
+                     (list "--" original-file)
+                   (list "--" (funcall (plist-get editor :inplace)))))))
            options
            (and args (cons "--" args)))))
 
@@ -535,6 +553,37 @@ it returns the value of `SOURCE' as it is."
                                    collect (cons (plist-get message :line)
                                                  (substring-no-properties msg (match-end 0))))))))
 
+(defun phpstan-version (executable)
+  "Return the PHPStan version of EXECUTABLE."
+  (if-let* ((cached-entry (assoc executable phpstan-executable-versions-alist)))
+      (cdr cached-entry)
+    (let* ((version (thread-first
+                      (mapconcat #'shell-quote-argument (list executable "--version") " ")
+                      (shell-command-to-string)
+                      (string-trim-right)
+                      (split-string " ")
+                      (last)
+                      (car-safe))))
+      (prog1 version
+        (push (cons executable version) phpstan-executable-versions-alist)))))
+
+(defun phpstan-editor-mode-available-p (executable)
+  "Check if the specified PHPStan EXECUTABLE supports editor mode.
+
+If a cached result for EXECUTABLE exists, it is returned directly.
+Otherwise, this function attempts to determine support by retrieving
+the PHPStan version using 'phpstan --version' command."
+  (pcase phpstan-activate-editor-mode
+    ('enabled t)
+    ('disabled nil)
+    ('nil
+     (let* ((version (phpstan-version executable)))
+       (if (string-match-p (eval-when-compile (regexp-quote "-dev@")) version)
+           t
+         (pcase (elt version 0)
+           (?1 (version<= "1.12.27" version))
+           (?2 (version<= "2.1.17" version))))))))
+
 (defconst phpstan--re-ignore-tag
   (eval-when-compile
     (rx (* (syntax whitespace)) "//" (* (syntax whitespace))