diff options
Diffstat (limited to 'modules/system-lib.el')
| -rw-r--r-- | modules/system-lib.el | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/modules/system-lib.el b/modules/system-lib.el index ed98a476e..49bb6cd1a 100644 --- a/modules/system-lib.el +++ b/modules/system-lib.el @@ -164,5 +164,29 @@ contributes its own modes regardless of load order." (setq font-lock-global-modes (cj/--font-lock-global-modes-excluding font-lock-global-modes mode)))) +(defun cj/format-region-with-program (program &rest args) + "Replace the current buffer with PROGRAM ARGS run over its contents, via argv. +Runs PROGRAM (with ARGS) on the whole buffer through `call-process-region' +-- no shell, so no quoting or word-splitting. The buffer is replaced only +when PROGRAM exits zero; on a non-zero exit the buffer is left untouched and +a `user-error' is signalled with the program's stderr text. Point is +preserved as closely as the reformatted size allows. Returns t on success." + (let* ((point (point)) + (src (current-buffer)) + (out (generate-new-buffer " *format-out*")) + (status (apply #'call-process-region + (point-min) (point-max) program + nil out nil args))) + (unwind-protect + (if (and (integerp status) (zerop status)) + (progn + (with-current-buffer src + (replace-buffer-contents out) + (goto-char (min point (point-max)))) + t) + (user-error "%s failed: %s" program + (string-trim (with-current-buffer out (buffer-string))))) + (kill-buffer out)))) + (provide 'system-lib) ;;; system-lib.el ends here |