* emacs/guix-base.el (guix-run-in-shell, guix-run-in-eshell,
  guix-run-command-in-shell): New functions.
  (guix-run-in-shell-function, guix-shell-buffer-name): New variables.

* emacs/guix-base.el (guix-run-command-in-repl, guix-command-output,
  guix-help-string): New functions.
* emacs/guix-main.scm (guix-command, guix-command-output, help-string):
  New procedures.

* guix/ui.scm (guix-main): Move the code to run guix command line to ...
  (run-guix): ...here.  New procedure.  Export it.

* emacs/guix-utils.el (guix-define-alist-accessor): New macro.
  (guix-assq-value, guix-assoc-value): New functions.
  (guix-get-key-val): Remove.
* emacs/guix-base.el: Replace 'guix-get-key-val' with 'guix-assq-value'
  everywhere.
* emacs/guix-info.el: Likewise.
* emacs/guix-list.el: Likewise.
* emacs/guix-messages.el: Likewise.

* emacs/guix-read.el: New file.
* emacs.am (ELFILES): Add it.

* emacs/guix-pcomplete.el (guix-pcomplete-parse-package-regexp,
  guix-pcomplete-parse-command-regexp,
  guix-pcomplete-parse-long-option-regexp,
  guix-pcomplete-parse-short-option-regexp,
  guix-pcomplete-parse-list-regexp, guix-pcomplete-parse-regexp-group,
  guix-pcomplete-systems, guix-pcomplete-hash-formats,
  guix-pcomplete-refresh-subsets, guix-pcomplete-key-policies): Move and
  rename to ...
* emacs/guix-help-vars.el (guix-help-parse-package-regexp,
  guix-help-parse-command-regexp, guix-help-parse-long-option-regexp,
  guix-help-parse-short-option-regexp, guix-help-parse-list-regexp,
  guix-help-parse-regexp-group, guix-help-system-types,
  guix-help-hash-formats, guix-help-refresh-subsets,
  guix-help-key-policies): ...here.  New file.
  (guix-help-parse-option-regexp, guix-help-source-types,
  guix-help-verify-options, guix-help-elpa-archives): New variables.
* emacs.am (ELFILES): Add "guix-help-vars.el".

* emacs/guix-main.scm (package-names, package-names-lists): New procedures.
* emacs/guix-base.el (guix-package-names): New function.

* emacs/guix-main.scm: Use (guix scripts graph) module.
  (graph-type-names): New procedure.
* emacs/guix-base.el (guix-graph-type-names): New function.

* guix/scripts/graph.scm (%node-types, node-type, node-type?,
  node-type-identifier, node-type-label, node-type-edges,
  node-type-convert, node-type-name, node-type-description): Export.

* emacs/guix-main.scm: Use (guix scripts lint) module.
  (lint-checker-names): New procedure.
* emacs/guix-base.el (guix-lint-checker-names): New function.

* guix/scripts/lint.scm (%checkers, lint-checker, lint-checker?,
  lint-checker-name, lint-checker-description, lint-checker-check):
  Export.

* emacs/guix-utils.el (guix-memoized-defalias): New macro.
  (guix-memoized-font-lock-keywords): New variable.

* emacs/guix-utils.el (guix-any): New function.

* emacs/guix-utils.el (guix-copy-as-kill, guix-copy-command-as-kill):
  New functions.

* emacs/guix-utils.el (guix-shell-quote-argument, guix-command-symbol,
  guix-command-string): New functions.

* emacs/guix-utils.el (guix-concat-strings): New function.
* emacs/guix-pcomplete.el (guix-pcomplete-short-options): Use it.
* emacs/guix-base.el (guix-get-package-strings): Likewise.

* emacs/guix-utils.el (guix-while-search): New macro.
* emacs/guix-pcomplete.el (guix-pcomplete-run-guix-and-search): Use it.
* emacs/guix-prettify.el (guix-prettify-decompose-buffer): Likewise.

* emacs/guix-prettify.el (guix-prettify): Add 'guix' group.

This is a followup to commit 74cc6737.

* emacs/guix-base.el (guix-define-buffer-type): Remove 'mode-map'
  variable.

* gnu/packages/gnome.scm (clutter)[outputs]: New field.
  [arguments]: Pass --with-html-dir.

* gnu/packages/gnome.scm (libchamplain): New variable.

* gnu/packages/ruby.scm (ruby-diff-lcs-for-rspec): Rename this...
  (ruby-diff-lcs): ... to this, and export it.
  (ruby-rspec-expectation, ruby-rspec-mocks): Use new varaible.

This saves ~10% on 'guix build inkscape -Sd'.

* guix/download.scm (%mirror-file): New variable.
  (url-fetch): Remove #:mirrors parameter.
  Remove 'mirror-file'; refer to '%mirror-file' instead.

* doc/guix.texi (Locales): Introduce "codeset".
  <%default-locale-definitions>: Mention the "normalized codeset", with
  an xref to libc's manual.
* gnu/system/locale.scm (%default-locale-definitions)[utf8-locale]:
  Mention the "normalized codeset" in a comment.

Reported by karhunkynsi on #guix.

* guix/scripts/refresh.scm (update-package): Add missing newline in
  string literal passed to 'warning'.

* gnu/packages/ruby.scm (ruby-i18n): Update to 0.7.0.

* gnu/packages/video.scm (mpv)[inputs]: Replace "jack-2" with "jack-1".

* gnu/packages/gstreamer.scm (gst-plugins-good)[inputs]: Replace "jack-2" with
  "jack-1".

* gnu/packages/audacity.scm (audacity)[inputs]: Replace "jack-2" with
  "jack-1".

* gnu/packages/audio.scm (rsound)[source]: Add 'file-name' field.

* gnu/packages/audio.scm (rsound)[inputs]: Replace "jack-2" with "jack-1".

* gnu/packages/gnome.scm (yelp-tools): New variable.

* gnu/packages/gnome.scm (yelp): New variable.

* gnu/packages/gnome.scm (yelp-xsl): New variable.

This significantly reduces churn in the store.  It also reduces run time
of 'guix build inkscape -Sd' by ~10%.

* guix/download.scm (url-fetch)[mirror-file]: New variable.
  [builder]: Get URL from the "guix download url" env. var.  Get the mirrors
  from MIRROR-FILE.  Pass #:script-name and #:env-vars to 'gexp->derivation'.

* guix/gexp.scm (gexp->derivation): Add #:script-name parameter.
* doc/guix.texi (G-Expressions): Document it.

* guix/monads.scm (define-lift): Turn into a macro that open-codes the result
  of its lift.

* gnu/packages/admin.scm (shadow): Update to 4.2.1.
  [source]: Use the release tarball.

* gnu/packages/abduco.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

* gnu/packages/haskell.scm (cabal-install): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>