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;;; jao-rust.el --- Utilities for rust programming -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Jose Ruiz
;; Author: Jose Ruiz <mail@jao.io>
;; Keywords: languages
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Code:
(defun jao-rust--root ()
(locate-dominating-file default-directory "Cargo.toml"))
(defun jao-rust-open-cargo ()
(interactive)
(let ((f (expand-file-name "Cargo.toml" (jao-rust--root))))
(when (or (file-exists-p f)
(y-or-n-p "No Cargo.toml found. Create? "))
(find-file f))))
(defun jao-rust-current-module-name ()
(let* ((root (expand-file-name (jao-rust--root)))
(current (file-name-sans-extension (buffer-file-name)))
(rel (string-replace root "" current)))
(and (string-prefix-p "src/" rel)
(thread-last
rel
(replace-regexp-in-string "^src\\(/bin\\)?/" "")
(string-replace "-" "_")
(replace-regexp-in-string "\\(^\\|/\\)\\(mod\\|lib\\|main\\)$" "")
(string-replace "/" "::")))))
(defun jao-rust--tests-prefix ()
(let ((m (jao-rust-current-module-name)))
(cond ((not (stringp m)) "")
((string-empty-p m) "tests::")
(t (concat m "::tests::")))))
(defconst jao-rust--test-header-rx
(concat "#\\[" (regexp-opt '("test" "quickcheck" "tokio::test") t)))
(defconst jao-rust--test-name-rx "^ *\\(pub \\)?\\( async \\)?fn \\([^(]+\\)(")
(defun jao-rust-test-at-point ()
(when (looking-at jao-rust--test-name-rx) (match-string-no-properties 3)))
(defun jao-rust-test-before-point ()
(save-excursion
(when (re-search-backward jao-rust--test-header-rx nil t)
(forward-line)
(jao-rust-test-at-point))))
(defconst jao-rust--tests-mod-rx "^\\(pub\\)? *mod tests {")
(defun jao-rust-goto-tests ()
(interactive)
(or (re-search-forward jao-rust--tests-mod-rx nil t)
(re-search-backward jao-rust--tests-mod-rx nil t)
(progn
(goto-char (point-min))
(re-search-forward jao-rust--test-header-rx nil t))
(when (y-or-n-p "No tests module. Add it?")
(goto-char (point-max))
(insert "\n#[cfg(test)]\nmod tests {\n\n}")
(forward-line -1))))
(defun jao-rust-test-current ()
(interactive)
(if-let* ((m (jao-rust--tests-prefix))
(n (jao-rust-test-before-point)))
(let ((rustic-test-arguments (format "-- --exact %s%s" m n))
(rustic-cargo-use-last-stored-arguments t))
(rustic-cargo-test))
(message "No test before point")))
(defun jao-rust-buffer-tests ()
(save-excursion
(goto-char (point-min))
(let ((res '()))
(while (re-search-forward jao-rust--test-header-rx nil t)
(forward-line)
(when-let* ((name (jao-rust-test-at-point))) (push name res)))
res)))
(defun jao-rust-test-module ()
(interactive)
(let ((tests (jao-rust-buffer-tests)))
(if (seq-empty-p tests)
(when (y-or-n-p "No tests in this module. Run doc tests?")
(jao-rust-test-doctests))
(let* ((prefix (jao-rust--tests-prefix))
(tests (mapconcat (lambda (x) (format "%s%s" prefix x)) tests " "))
(rustic-test-arguments (format "-- --exact %s" tests))
(rustic-cargo-use-last-stored-arguments t))
(rustic-cargo-test)))))
(defun jao-rust-test-doctests (&optional all)
(interactive "P")
(let* ((m (if all "" (jao-rust-current-module-name)))
(rustic-cargo-test-runner 'cargo)
(rustic-test-arguments (format "--doc %s" m))
(rustic-cargo-use-last-stored-arguments t))
(rustic-cargo-test)))
(defun jao-rust-retest ()
(interactive)
(let* ((rustic-test-arguments "-R latest")
(rustic-cargo-use-last-stored-arguments t))
(rustic-cargo-test)))
(defun jao-rust-test-workspace ()
(interactive)
(let ((rustic-test-arguments rustic-default-test-arguments))
(rustic-cargo-test)))
(defun jao-rust-build-doc (deps)
(interactive "P")
(rustic-run-cargo-command `(,(rustic-cargo-bin) "doc" ,@(unless deps '("--no-deps")))))
(provide 'jao-rust)
;;; jao-rust.el ends here
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