;;; Guix automation.
(defun guix-build-package-at-point ()
  "Evaluate sexp at point and build it in Geiser."
  (interactive)
  (let ((name (save-excursion
                (beginning-of-defun)
                (forward-char)          ;skip (
                (forward-sexp)          ;define-public
                (forward-comment (point-max))
                (symbol-at-point)))
        (sexp-string (save-mark-and-excursion
                       (mark-defun)
                       (buffer-substring-no-properties
                        (region-beginning)
                        (region-end)))))
    ;; Evaluate the package.
    (geiser-mode-switch-to-repl-and-enter) ;start geiser/load module
    (geiser-repl-switch)                ;switch back to scheme buffer
    (guix-geiser-eval sexp-string)

    ;; ;; Build the package.
    (guix-geiser-eval "(use-modules (guix))")
    (guix-geiser-eval-in-repl (format ",build %s" name))

    ;; TODO: Inspect if there's a log in the last 10 lines, if so,
    ;; open it.
    (let ((repl-text (save-mark-and-excursion
                       (buffer-substring-no-properties
                        (region-beginning)
                        (region-end)))))
      (when (string-match (rx "View build log at '" (group (+ graphic)) "'.")
                          repl-text)
        (guix-build-log-find-file (match-string 1 repl-text))))))