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+;;; guix-devel.el --- Development tools   -*- lexical-binding: t -*-
+
+;; Copyright © 2015 Alex Kost <alezost@gmail.com>
+
+;; This file is part of GNU Guix.
+
+;; GNU Guix 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.
+
+;; GNU Guix 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file provides commands useful for developing Guix (or even
+;; arbitrary Guile code) with Geiser.
+
+;;; Code:
+
+(require 'guix-guile)
+(require 'guix-geiser)
+(require 'guix-utils)
+(require 'guix-base)
+
+(defgroup guix-devel nil
+  "Settings for Guix development utils."
+  :group 'guix)
+
+(defcustom guix-devel-activate-mode t
+  "If non-nil, then `guix-devel-mode' is automatically activated
+in Scheme buffers."
+  :type 'boolean
+  :group 'guix-devel)
+
+(defun guix-devel-use-modules (&rest modules)
+  "Use guile MODULES."
+  (apply #'guix-geiser-call "use-modules" modules))
+
+(defun guix-devel-use-module (&optional module)
+  "Use guile MODULE in the current Geiser REPL.
+MODULE is a string with the module name - e.g., \"(ice-9 match)\".
+Interactively, use the module defined by the current scheme file."
+  (interactive (list (guix-guile-current-module)))
+  (guix-devel-use-modules module)
+  (message "Using %s module." module))
+
+(defun guix-devel-copy-module-as-kill ()
+  "Put the name of the current guile module into `kill-ring'."
+  (interactive)
+  (guix-copy-as-kill (guix-guile-current-module)))
+
+(defun guix-devel-setup-repl (&optional repl)
+  "Setup REPL for using `guix-devel-...' commands."
+  (guix-devel-use-modules "(guix monad-repl)"
+                          "(guix scripts)"
+                          "(guix store)")
+  ;; Without this workaround, the build output disappears.  See
+  ;; <https://github.com/jaor/geiser/issues/83> for details.
+  (guix-geiser-eval-in-repl
+   "(current-build-output-port (current-error-port))"
+   repl 'no-history 'no-display))
+
+(defvar guix-devel-repl-processes nil
+  "List of REPL processes configured by `guix-devel-setup-repl'.")
+
+(defun guix-devel-setup-repl-maybe (&optional repl)
+  "Setup (if needed) REPL for using `guix-devel-...' commands."
+  (let ((process (get-buffer-process (or repl (guix-geiser-repl)))))
+    (when (and process
+               (not (memq process guix-devel-repl-processes)))
+      (guix-devel-setup-repl repl)
+      (push process guix-devel-repl-processes))))
+
+(defun guix-devel-build-package-definition ()
+  "Build a package defined by the current top-level variable definition."
+  (interactive)
+  (let ((def (guix-guile-current-definition)))
+    (guix-devel-setup-repl-maybe)
+    (guix-devel-use-modules (guix-guile-current-module))
+    (when (or (not guix-operation-confirm)
+              (guix-operation-prompt (format "Build '%s'?" def)))
+      (guix-geiser-eval-in-repl
+       (concat ",run-in-store "
+               (guix-guile-make-call-expression
+                "build-package" def
+                "#:use-substitutes?" (guix-guile-boolean
+                                      guix-use-substitutes)
+                "#:dry-run?" (guix-guile-boolean guix-dry-run)))))))
+
+(defvar guix-devel-keys-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "b") 'guix-devel-build-package-definition)
+    (define-key map (kbd "k") 'guix-devel-copy-module-as-kill)
+    (define-key map (kbd "u") 'guix-devel-use-module)
+    map)
+  "Keymap with subkeys for `guix-devel-mode-map'.")
+
+(defvar guix-devel-mode-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map (kbd "C-c .") guix-devel-keys-map)
+    map)
+  "Keymap for `guix-devel-mode'.")
+
+;;;###autoload
+(define-minor-mode guix-devel-mode
+  "Minor mode for `scheme-mode' buffers.
+
+With a prefix argument ARG, enable the mode if ARG is positive,
+and disable it otherwise.  If called from Lisp, enable the mode
+if ARG is omitted or nil.
+
+When Guix Devel mode is enabled, it provides the following key
+bindings:
+
+\\{guix-devel-mode-map}"
+  :init-value nil
+  :lighter " Guix"
+  :keymap guix-devel-mode-map)
+
+;;;###autoload
+(defun guix-devel-activate-mode-maybe ()
+  "Activate `guix-devel-mode' depending on
+`guix-devel-activate-mode' variable."
+  (when guix-devel-activate-mode
+    (guix-devel-mode)))
+
+(provide 'guix-devel)
+
+;;; guix-devel.el ends here