[nongnu] elpa/rust-mode 72c479b 311/486: Add `rust-run-clippy' and `rust-buffer-project' with testing paraphernalia.

[ELPA Syncer]

branch: elpa/rust-mode
commit 72c479bd0d91befe9b2a77636c6b2731163ffcd6
Author: Aankhen <Aankhen@users.noreply.github.com>
Commit: Aankhen <Aankhen@users.noreply.github.com>

    Add `rust-run-clippy' and `rust-buffer-project' with testing paraphernalia.
---
 rust-mode-tests.el      |  9 +++++++++
 rust-mode.el            | 37 ++++++++++++++++++++++++++++++++++++-
 test-project/Cargo.toml |  1 +
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/rust-mode-tests.el b/rust-mode-tests.el
index 6d58906..42792ac 100644
--- a/rust-mode-tests.el
+++ b/rust-mode-tests.el
@@ -2650,6 +2650,15 @@ extern \"rust-intrinsic\" fn five() {
       "four"
       "five"))))
 
+(ert-deftest rust-test-project-located ()
+  (lexical-let* ((this-dir default-directory)
+                 (test-dir (expand-file-name "test-project" this-dir))
+                 (manifest-file (expand-file-name "Cargo.toml" test-dir)))
+    (find-file (expand-file-name "test-project/foo.rs"))
+    (unwind-protect
+        (should (equal (expand-file-name (rust-buffer-project)) manifest-file))
+      (kill-buffer))))
+
 ;; If electric-pair-mode is available, load it and run the tests that use it.  
If not,
 ;; no error--the tests will be skipped.
 (require 'elec-pair nil t)
diff --git a/rust-mode.el b/rust-mode.el
index f3f799c..0e18138 100644
--- a/rust-mode.el
+++ b/rust-mode.el
@@ -144,6 +144,12 @@ function or trait.  When nil, where will be aligned with 
fn or trait."
   :type 'string
   :group 'rust-mode)
 
+(defcustom rust-always-locate-project-on-open nil
+  "Whether to run `cargo locate-project' every time `rust-mode'
+  is activated."
+  :type 'boolean
+  :group 'rust-mode)
+
 (defface rust-unsafe-face
   '((t :inherit font-lock-warning-face))
   "Face for the `unsafe' keyword."
@@ -1411,7 +1417,12 @@ This is written mainly to be used as 
`end-of-defun-function' for Rust."
 
   (setq-local compile-command "cargo build")
 
-  (add-hook 'before-save-hook 'rust--before-save-hook nil t))
+  (add-hook 'before-save-hook 'rust--before-save-hook nil t)
+
+  (setq-local rust-buffer-project nil)
+
+  (when rust-always-locate-project-on-open
+    (rust-update-buffer-project)))
 
 ;;;###autoload
 (add-to-list 'auto-mode-alist '("\\.rs\\'" . rust-mode))
@@ -1548,6 +1559,30 @@ visit the new file."
           (rename-file filename new-name 1)
           (set-visited-file-name new-name))))))
 
+(defun rust-run-clippy ()
+  "Run `cargo clippy'."
+  (interactive)
+  (when (null rust-buffer-project)
+    (rust-update-buffer-project))
+  (let* ((args (list "cargo" "clippy" (concat "--manifest-path=" 
rust-buffer-project)))
+         ;; set `compile-command' temporarily so `compile' doesn't
+         ;; clobber the existing value
+         (compile-command (mapconcat #'shell-quote-argument args " ")))
+    (compile compile-command)))
+
+(defun rust-update-buffer-project ()
+  (setq-local rust-buffer-project (rust-buffer-project)))
+
+(defun rust-buffer-project ()
+  "Get project root if possible."
+  (with-temp-buffer
+    (let ((ret (call-process "cargo" nil t nil "locate-project")))
+      (when (/= ret 0)
+        (error "`cargo locate-project' returned %s status: %s" ret 
(buffer-string)))
+      (goto-char 0)
+      (let ((output (json-read)))
+        (cdr (assoc-string "root" output))))))
+
 (provide 'rust-mode)
 
 ;;; rust-mode.el ends here
diff --git a/test-project/Cargo.toml b/test-project/Cargo.toml
new file mode 100644
index 0000000..f413f6b
--- /dev/null
+++ b/test-project/Cargo.toml
@@ -0,0 +1 @@
+1