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;;; rust-compile.el --- Compile facilities -*-lexical-binding: t-*-
;;; Commentary:
;; This library teaches `compilation-mode' about "rustc" output.
;;; Code:
(require 'compile)
;;; _
(defvar rustc-compilation-location
(let ((file "\\([^\n]+\\)")
(start-line "\\([0-9]+\\)")
(start-col "\\([0-9]+\\)"))
(concat "\\(" file ":" start-line ":" start-col "\\)")))
(defvar rustc-compilation-regexps
(let ((re (concat "^\\(?:error\\|\\(warning\\)\\|\\(note\\)\\)[^\0]+?--> "
rustc-compilation-location)))
(cons re '(4 5 6 (1 . 2) 3)))
"Specifications for matching errors in rustc invocations.
See `compilation-error-regexp-alist' for help on their format.")
(defvar rustc-colon-compilation-regexps
(let ((re (concat "^ *::: " rustc-compilation-location)))
(cons re '(2 3 4 0 1)))
"Specifications for matching `:::` hints in rustc invocations.
See `compilation-error-regexp-alist' for help on their format.")
(defvar rustc-refs-compilation-regexps
(let ((re "^\\([0-9]+\\)[[:space:]]*|"))
(cons re '(nil 1 nil 0 1)))
"Specifications for matching code references in rustc invocations.
See `compilation-error-regexp-alist' for help on their format.")
;; Match test run failures and panics during compilation as
;; compilation warnings
(defvar cargo-compilation-regexps
'("', \\(\\([^:]+\\):\\([0-9]+\\)\\)"
2 3 nil nil 1)
"Specifications for matching panics in cargo test invocations.
See `compilation-error-regexp-alist' for help on their format.")
(defun rustc-scroll-down-after-next-error ()
"In the new style error messages, the regular expression
matches on the file name (which appears after `-->`), but the
start of the error appears a few lines earlier. This hook runs
after `next-error' (\\[next-error]); it simply scrolls down a few lines in
the compilation window until the top of the error is visible."
(save-selected-window
(when (eq major-mode 'rust-mode)
(select-window (get-buffer-window next-error-last-buffer 'visible))
(when (save-excursion
(beginning-of-line)
(looking-at " *-->"))
(let ((start-of-error
(save-excursion
(beginning-of-line)
(while (not (looking-at "^[a-z]+:\\|^[a-z]+\\[E[0-9]+\\]:"))
(forward-line -1))
(point))))
(set-window-start (selected-window) start-of-error))))))
(eval-after-load 'compile
'(progn
(add-to-list 'compilation-error-regexp-alist-alist
(cons 'rustc-refs rustc-refs-compilation-regexps))
(add-to-list 'compilation-error-regexp-alist 'rustc-refs)
(add-to-list 'compilation-error-regexp-alist-alist
(cons 'rustc rustc-compilation-regexps))
(add-to-list 'compilation-error-regexp-alist 'rustc)
(add-to-list 'compilation-error-regexp-alist-alist
(cons 'rustc-colon rustc-colon-compilation-regexps))
(add-to-list 'compilation-error-regexp-alist 'rustc-colon)
(add-to-list 'compilation-error-regexp-alist-alist
(cons 'cargo cargo-compilation-regexps))
(add-to-list 'compilation-error-regexp-alist 'cargo)
(add-hook 'next-error-hook #'rustc-scroll-down-after-next-error)))
;;; _
(provide 'rust-compile)
;;; rust-compile.el ends here
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