* emacs/guix-ui.el (guix-ui-read-profile): New procedure.
* emacs/guix-ui-package.el (guix-search-by-name)
  (guix-search-by-regexp, guix-installed-packages)
  (guix-obsolete-packages, guix-all-available-packages)
  (guix-newest-available-packages): Use it.
* emacs/guix-ui-generation.el (guix-generations)
  (guix-last-generations, guix-generations-by-time): Use it.

* emacs/guix-buffer.el (guix-define-groups, guix-define-entry-type)
  (guix-define-buffer-type): New macros.
  (guix-buffer-define-interface): Add parent groups for the generated
  custom groups.
* emacs/guix-info.el: Use 'guix-define-buffer-type' to generate custom
  groups.
* emacs/guix-list.el: Likewise.
* emacs/guix-ui.el: Use 'guix-define-groups' to generate custom groups.
  (guix-ui-define-entry-type): New macro.
* emacs/guix-ui-package.el: Use it.
* emacs/guix-ui-generation.el: Use it.

* emacs/guix-utils.el (guix-completing-read): New procedure.
  (guix-define-readers): Use it.

* emacs/guix-list.el (guix-list-get-display-entries): New procedure.
* emacs/guix-ui-generation.el (guix-generation-get-display): Use it.

* emacs/guix-list.el (guix-list-single-entry?): New procedure.
  (guix-list-define-interface): Add ':list-single?' key and generate
  'guix-ENTRY-TYPE-list-single' variables.
* emacs/guix-ui-package.el (guix-package-list-single): Remove.

Move the code for packages/generations interface from "guix-info.el",
"guix-list.el", "guix-base.el" and "guix.el" to "guix-ui-package.el" and
"guix-ui-generation.el".

* emacs/guix-base.el (guix-package-entry->name-specification)
  (guix-package-entries->name-specifications)
  (guix-package-id-and-output-by-output-id)
  (guix-package-installed-outputs, guix-process-package-actions)
  (guix-package-list-type, guix-package-info-type)
  (guix-continue-package-operation-p, guix-get-package-strings)
  (guix-insert-package-strings): Move to "guix-ui-package.el".
  (guix-generation-packages-buffer-name-function, guix-output-name-width)
  (guix-generation-packages-update-buffer, guix-generation-packages)
  (guix-generation-packages-buffer-name-default)
  (guix-generation-packages-buffer-name-long)
  (guix-generation-packages-buffer-name, guix-generation-packages-buffer)
  (guix-generation-insert-packages, guix-generation-insert-package)
  (guix-profile-generation-manifest-file, guix-delete-generations)
  (guix-profile-generation-packages-buffer, guix-switch-to-generation):
  Move to "guix-ui-generation.el".
* emacs/guix-info.el (guix-package-location, guix-package-name)
  (guix-package-source, guix-package-info-source)
  (guix-package-info-heading, guix-package-info-license)
  (guix-package-info-name, guix-package-info-name-button)
  (guix-package-info-version, guix-package-info-location)
  (guix-package-info-synopsis, guix-package-info-description)
  (guix-package-info-obsolete, guix-package-info-installed-outputs)
  (guix-package-info-uninstalled-outputs)
  (guix-package-info-insert-heading)
  (guix-package-info-define-insert-inputs)
  (guix-package-info-obsolete-string)
  (guix-package-info-insert-obsolete-text)
  (guix-package-info-insert-non-unique-text)
  (guix-package-info-insert-outputs, guix-package-info-insert-output)
  (guix-package-info-insert-action-button)
  (guix-package-info-auto-find-source)
  (guix-package-info-auto-download-source)
  (guix-package-info-download-buffer, guix-package-info-show-source)
  (guix-package-info-download-source, guix-package-info-insert-source)
  (guix-package-info-redisplay-after-download)
  (guix-output-info-insert-version, guix-output-info-insert-output):
  Move to "guix-ui-package.el".
  (guix-generation-info-number, guix-generation-info-current)
  (guix-generation-not-current, guix-generation-info-insert-number)
  (guix-generation-info-insert-current): Move to "guix-ui-generation.el".
* emacs/guix-list.el (guix-package-list-generation-marking-enabled)
  (guix-package-list-installed, guix-package-list-obsolete)
  (guix-package-list-get-name, guix-package-list-get-installed-outputs)
  (guix-package-list-marking-check, guix-package-list-mark-outputs)
  (guix-package-list-mark-install, guix-package-list-mark-delete)
  (guix-package-list-mark-upgrade, guix-package-list-mark-upgrades)
  (guix-list-mark-package-upgrades, guix-list-execute-package-actions)
  (guix-package-list-execute, guix-package-list-make-action)
  (guix-package-list-edit, guix-output-list-mark-install)
  (guix-output-list-mark-delete, guix-output-list-mark-upgrade)
  (guix-output-list-mark-upgrades, guix-output-list-make-action)
  (guix-output-list-describe, guix-output-list-edit): Move to
  "guix-ui-package.el".
  (guix-generation-list-get-current, guix-generation-list-switch)
  (guix-generation-list-generations-to-compare)
  (guix-generation-list-compare, guix-generation-list-show-packages)
  (guix-generation-list-show-added-packages)
  (guix-generation-list-show-removed-packages)
  (guix-generation-list-diff, guix-generation-list-diff-manifests)
  (guix-generation-list-ediff, guix-generation-list-ediff-manifests)
  (guix-generation-list-diff-packages)
  (guix-generation-list-ediff-packages)
  (guix-generation-list-mark-delete, guix-generation-list-execute): Move
  to "guix-ui-generation.el".
* emacs/guix.el: Remove.
  (guix, guix-faces, guix-edit): Move to "guix-base.el".
  (guix-list-single-package, guix-search-params, guix-search-history)
  (guix-get-show-packages, guix-search-by-name, guix-search-by-regexp)
  (guix-installed-packages, guix-obsolete-packages)
  (guix-all-available-packages, guix-newest-available-packages): Move
  to "guix-ui-package.el".
  (guix-get-show-generations, guix-generations, guix-last-generations)
  (guix-generations-by-time): Move to "guix-ui-generation.el".
* emacs.am (ELFILES): Remove "guix.el".  Add "guix-ui-package.el" and
  "guix-ui-generation.el".
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

* emacs/guix-base.el (guix-graph-type-names, guix-refresh-updater-names)
  (guix-lint-checker-names, guix-package-names): Move to...
* emacs/guix-read.el: ... here.
  (guix-read-file-name, guix-define-reader, guix-define-readers): Move to...
* emacs/guix-utils.el: ... here.

Extract the code for defining buffer interface from "guix-base.el",
generalize it and move to "guix-buffer.el".

* emacs.am (ELFILES): Add "emacs/guix-buffer.el".
* emacs/guix-base.el (guix-profile, guix-entries, guix-buffer-type)
  (guix-entry-type, guix-search-type, guix-search-vals, guix-set-vars)
  (guix-get-symbol, guix-show-entries, guix-get-show-entries)
  (guix-set-buffer, guix-history-call, guix-make-history-item)
  (guix-get-params-for-receiving): Remove.
  (guix-switch-to-buffer): Rename to 'guix-buffer-display' and move to
  "guix-buffer.el".
  (guix-get-entries): Rename to 'guix-ui-get-entries' and move to
  "guix-ui.el".
  (guix-buffer-data, guix-buffer-value, guix-buffer-param-title)
  (guix-buffer-name, guix-buffer-history-size)
  (guix-buffer-revert-confirm?, guix-buffer-map, guix-buffer-revert)
  (guix-buffer-after-redisplay-hook, guix-buffer-redisplay)
  (guix-buffer-redisplay-goto-button): Move to...
* emacs/guix-buffer.el: ... here.  New file.
  (guix-buffer-item): New variable.
  (guix-buffer-with-item, guix-buffer-with-current-item)
  (guix-buffer-define-current-item-accessor)
  (guix-buffer-define-current-item-accessors)
  (guix-buffer-define-current-args-accessor)
  (guix-buffer-define-current-args-accessors): New macros.
  (guix-buffer-get-entries, guix-buffer-mode-enable)
  (guix-buffer-mode-initialize, guix-buffer-insert-entries)
  (guix-buffer-show-entries-default, guix-buffer-show-entries)
  (guix-buffer-message, guix-buffer-history-item, guix-buffer-set)
  (guix-buffer-display-entries-current)
  (guix-buffer-get-display-entries-current)
  (guix-buffer-display-entries, guix-buffer-get-display-entries): New
  procedures.
* emacs/guix-info.el: Adjust for the procedures renaming.
  (guix-info-define-interface): Add ':show-entries-function' keyword.
* emacs/guix-list.el: Likewise.
* emacs/guix-ui.el (guix-ui-define-interface): Generate
  'guix-ENTRY-TYPE-BUFFER-TYPE-get-entries' procedure based on
  'guix-ui-get-entries'.
* emacs/guix.el (guix-get-show-packages, guix-get-show-generations):
  Adjust for the procedures renaming.

* emacs/guix-info.el (guix-info-mode-initialize): New procedure.  Set
  'font-lock-defaults' to avoid syntactic fontification.
  (guix-info-define-interface): Use it.

* emacs/guix-base.el (guix-buffer-name): New procedure.
  (guix-buffer-define-interface): Make ':buffer-name' a required keyword.
  (guix-update-after-operation, guix-buffer-name-function)
  (guix-buffer-name-simple, guix-buffer-name-default, guix-buffer-name)
  (guix-buffer-p, guix-buffers, guix-update-buffer)
  (guix-update-buffers-maybe-after-operation): Adjust, move and rename to...
* emacs/guix-ui.el (guix-ui-update-after-operation)
  (guix-ui-buffer-name-function, guix-ui-buffer-name-simple)
  (guix-ui-buffer-name-default, guix-ui-buffer-name)
  (guix-ui-buffer?, guix-ui-buffers, guix-ui-update-buffer)
  (guix-ui-update-buffers-after-operation): ... this.
  (guix-ui-define-interface): Generate
  'guix-ENTRY-TYPE-BUFFER-TYPE-buffer-name' procedure and pass it as
  ':buffer-name' argument.
  (guix-ui): New custom group.
* emacs/guix-info.el: Specify ':buffer-name' for the defined interfaces.
* emacs/guix-list.el: Likewise.
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

* emacs/guix-info.el (guix-package-info-insert-heading): Insert
  buttonized name specification.

* emacs/guix-messages.el (guix-message-packages-by-id): New procedure.
  (guix-messages): Use it.

This is a partial revert of commit d2b299a9.

* emacs/guix-base.el (guix-revert-buffer): Make it more general by
  removing the code specific to a particular search (a search for
  packages/outputs by ID).  Rename to...
  (guix-buffer-revert): ... this.

* emacs/guix-base.el (guix-buffer-after-redisplay-hook): New variable.
  (guix-redisplay-buffer): Use it.  Remove all arguments and the code
  for moving point to the next button.  Rename to...
  (guix-buffer-redisplay): ... this.
  (guix-buffer-redisplay-goto-button): New procedure.
* emacs/guix-info.el (guix-package-info-show-source): Use it.  Adjust
  accordingly.
  (guix-package-info-redisplay-after-download): Likewise.

* emacs/guix-base.el: (guix-root-map): Split into...
  (guix-buffer-map): ... this and...
* emacs/guix-ui.el (guix-ui-map): ... this.
  (guix-ui-define-interface): Generate
  'guix-ENTRY-TYPE-BUFFER-TYPE-mode-map' keymaps inheriting them from
  'guix-ui-map' and 'guix-BUFFER-TYPE-mode-map'.
* emacs/guix-info.el (guix-info-mode-map): Use 'guix-buffer-map'.
* emacs/guix-list.el (guix-list-mode-map): Likewise.
* doc/emacs.texi (Emacs Keymaps): Document new keymaps.

* emacs/guix-base.el (guix-buffer-history-size): New procedure.
  (guix-buffer-define-interface): Use it in the mode definition.
  (guix-buffer-revert-confirm?): New procedure.
  (guix-revert-buffer): Use it.

Generate 'guix-ENTRY-TYPE-BUFFER-TYPE-titles' variables for each
ENTRY-TYPE and BUFFER-TYPE instead.

* emacs/guix-base.el (guix-param-titles): Remove.
  (guix-buffer-data): New variable.
  (guix-buffer-value, guix-buffer-param-title): New procedures.
  (guix-buffer-define-interface): Add ':titles' keyword.
* emacs/guix-info.el (guix-info-param-title): Adjust accordingly.
* emacs/guix-list.el (guix-list-param-title): Likewise.
  (guix-list-column-titles): Remove.
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

* emacs/guix-info.el: Generate 'guix-ENTRY-TYPE-info-format' variables
  for 'package', 'installed-output', 'output' and 'generation' entry
  types.
  (guix-info-format): Remove.
  (guix-info-data): New variable.
  (guix-info-value): New procedure.
  (guix-info-define-interface): Add ':format' keyword.
* emacs/guix-base.el (guix-buffer-define-interface): Add ':reduced?'
  keyword.
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

Make a root 'guix-buffer-define-interface' macro.  It should generate a
common code for any type of interface.  Inherit 'guix-info-define-interface'
and 'guix-list-define-interface' from it.  They should provide a general
'info'/'list' interface for any data.  Finally, make
'guix-ui-define-interface' for the common code for interfaces to Guix
packages and generations, and inherit 'guix-ui-info-define-interface' and
'guix-ui-list-define-interface' from it.

* emacs/guix-base.el (guix-define-buffer-type): Rename to...
  (guix-buffer-define-interface): ... this.  Rename internal
  variables ('buf-' -> 'buffer-').  Move ':required' keyword to
  'guix-ui-define-interface'.
* emacs/guix-info.el (guix-info-define-interface): New macro.
  (guix-info-font-lock-keywords): New variable.
* emacs/guix-list.el (guix-list-define-entry-type): Rename to...
  (guix-list-define-interface): ... this.
  (guix-list-font-lock-keywords): New variable.
  (guix-list-describe-ids): Move and rename to...
* emacs/guix-ui.el: New file.
  (guix-ui-list-describe): ... this.
  (guix-ui-define-interface, guix-ui-info-define-interface)
  (guix-ui-list-define-interface): New macros.
  (guix-ui-font-lock-keywords): New variable.
* emacs.am (ELFILES): Add "emacs/guix-ui.el"

* emacs/guix-info.el: Use a more flexible format for inserting any data.
  (guix-info-ignore-empty-vals): Rename to...
  (guix-info-ignore-empty-values): ... this.
  (guix-info-insert-methods): Merge this and...
  (guix-info-displayed-params): ... this into...
  (guix-info-format): ... this.  Change format specifications.
  (guix-info-title-aliases, guix-info-value-aliases): New variables.
  (guix-info-displayed-params): Adjust for the new format.
  (guix-info-insert-entry): Likewise.
  (guix-package-info-fill-heading): Replace with...
  (guix-info-fill): ... this.
  (guix-info-insert-param): Replace with...
  (guix-info-insert-entry-unit): ... this.
  (guix-info-insert-title-default): Replace with...
  (guix-info-insert-title-format): ... this.
  (guix-info-insert-val-default): Replace with...
  (guix-info-insert-value-format): ... this.
  (guix-info-insert-val-simple): Replace with...
  (guix-info-insert-value-indent): ... this.
  (guix-package-info-insert-source): Adjust accordingly.
  (guix-package-info-insert-heading): Insert only name and version.
  (guix-package-info-define-insert-inputs): Do not generate
  'guix-package-info-insert-ENTRY-TYPE-inputs' procedures.
  (guix-info-fill-column, guix-info-insert-entry-default)
  (guix-info-method-funcall, guix-info-insert-file-path)
  (guix-info-insert-url, guix-info-insert-package-function)
  (guix-info-insert-installed-function)
  (guix-info-insert-output-function)
  (guix-info-insert-generation-function)
  (guix-package-info-heading-params)
  (guix-package-info-insert-with-heading)
  (guix-package-info-insert-description)
  (guix-package-info-insert-location)
  (guix-package-info-insert-full-names)
  (guix-package-info-insert-source-url): Remove.
  (guix-info-fill-column, guix-info-param-title)
  (guix-info-title-function, guix-info-value-function)
  (guix-info-title-method->function)
  (guix-info-value-method->function)
  (guix-info-insert-value-simple): New procedures.
* emacs/guix-utils.el (guix-buttonize, guix-button-type?): New
  procedures.
  (guix-split-string): Split multi-line strings and ignore empty lines.
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

* emacs/guix-list.el: Use separate edit commands instead of a single one.
  (guix-list-for-each-line, guix-list-edit-package): Remove.
  (guix-package-list-edit, guix-output-list-edit): New procedures.
  (guix-package-list-mode-map, guix-output-list-mode-map): Use them.

* emacs/guix-list.el: Generate 'guix-ENTRY-TYPE-list-format' variables
  for 'package', 'output' and 'generation' entry types.
  (guix-list-format): Remove.
  (guix-list-define-entry-type): Add ':format' keyword.
* doc/emacs.texi (Emacs Appearance): Adjust accordingly.

* emacs/guix-list.el (guix-list-mode-initialize): New procedure.
  (guix-list-define-entry-type): Use it.

* emacs/guix-list.el (guix-list-sort-key): New procedure.
  (guix-list-tabulated-sort-key): Use it.
  (guix-list-define-entry-type): Generate
  'guix-ENTRY-TYPE-list-sort-key' variables.

* emacs/guix-list.el (guix-list-describe-warning-count): Remove variable.
  (guix-list-define-entry-type): Generate
  'guix-ENTRY-TYPE-list-describe-warning-count' and
  'guix-ENTRY-TYPE-list-describe-function' variables.
  (guix-list-describe-maybe): Remove.  Move the code...
  (guix-list-describe): ... here.
  (guix-list-describe-warning-count, guix-list-describe-entries)
  (guix-list-describe-ids): New procedures.
  (guix-output-list-describe): Adjust accordingly.
  (guix-list-mode-map): Bind "i" key to 'guix-list-describe'.
  (guix-generation-list-mode-map): Remove "i" key.

* emacs/guix-list.el (guix-list-mark-alist): Rename to...
  (guix-list-marks): ... this
  (guix-list-data, guix-list-default-marks): New variables.
  (guix-list-value, guix-list-additional-marks, guix-list-marks): New
  procedures.
  (guix-list-define-entry-type): Adjust accordingly.

* emacs/guix-utils.el (guix-alist-put, guix-alist-put-1)
  (guix-alist-put!): New procedures.

* emacs/guix-utils.el (guix-keyword-args-let): New macro.
  (guix-utils-font-lock-keywords): Add it.
* emacs/guix-base.el (guix-define-buffer-type): Use it.
* emacs/guix-list.el (guix-list-define-entry-type): Use it.
* emacs/guix-read.el (guix-define-readers): Use it.

* emacs/guix-list.el: (guix-list-column-format): Merge this and...
  (guix-list-column-value-methods): ... this into...
  (guix-list-format): ... this.  New variable.
  (guix-list-tabulated-vector): Adjust accordingly.
  (guix-list-tabulated-format): Likewise.
  (guix-list-tabulated-entry): Likewise.
* doc/emacs.texi (Emacs Appearance): Likewise.

* emacs/guix-list.el (guix-list-get-param-title): Rename to...
  (guix-list-param-title): ... this.
  (guix-list-get-column-format): Rename to...
  (guix-list-format): ... this.
  (guix-list-get-displayed-params): Rename to...
  (guix-list-displayed-params): ... this.
  (guix-list-get-sort-key): Rename to...
  (guix-list-tabulated-sort-key): ... this.
  (guix-list-make-tabulated-vector): Rename to...
  (guix-list-tabulated-vector): ... this.
  (guix-list-get-list-format): Rename to...
  (guix-list-tabulated-format): ... this.
  (guix-list-get-tabulated-entries): Rename to...
  (guix-list-tabulated-entries): ... this.
  (guix-list-get-tabulated-entry): Rename to...
  (guix-list-tabulated-entry): ... this.
* emacs/guix-info.el (guix-info-get-displayed-params): Rename to...
  (guix-info-displayed-params): ... this.
* emacs/guix-base.el (guix-get-params-for-receiving): Adjust
  accordingly.
  (guix-get-name-spec): Rename to...
  (guix-package-name-specification): ... this.
  (guix-get-full-name): Merge this and...
  (guix-entry-to-specification): ... this into...
  (guix-package-entry->name-specification): ... this.
  (guix-get-installed-outputs): Rename to...
  (guix-package-installed-outputs): ... this.
  (guix-get-package-id-and-output-by-output-id): Rename to...
  (guix-package-id-and-output-by-output-id): ... this.

* emacs/guix-list.el: Generate predicates to sort tabulated list
  columns numerically.
  (guix-list-define-numerical-sorter)
  (guix-list-define-numerical-sorters): New macros
  (guix-list-column-format): Use 'guix-list-sort-numerically-0' for
  generation "Number" column.

* emacs/guix-utils.el (guix-symbol-title): New procedure.
* emacs/guix-base.el (guix-get-param-title): Use it.
  (guix-param-titles): Remove most titles as they are automatically
  defined by 'guix-symbol-title'.

* emacs/guix-info.el: Use new entry procedures.
* emacs/guix-list.el: Likewise.
* emacs/guix-base.el: Likewise.
  (guix-get-entry-by-id): Move and rename to ...
* emacs/guix-entry.el (guix-entry-by-id): ...this.  New file.
  (guix-entry-value, guix-entry-id, guix-entries-by-ids)
  (guix-replace-entry): New procedures.
* emacs.am (ELFILES): Add new file.

* emacs/guix-utils.el (guix-with-indent): New macro.
  (guix-memoized-font-lock-keywords): Rename to...
  (guix-utils-font-lock-keywords): ... this.  Add it.
* emacs/guix-info.el (guix-info-insert-entry-default): Use it.

* emacs/guix-command.el (guix-run-view-build-log): Use cl-list*.
  (guix-run-view-size-map): Likewise.
* emacs/guix-external.el (guix-dot-arguments): Likewise.

* gnu/packages/python.scm (python-markdown, python2-markdown): New
variables.

Signed-off-by: Leo Famulari <leo@famulari.name>

* gnu/packages/game-development.scm (love): Update to 0.10.0.

* gnu/packages/ssh.scm (guile-ssh): Update to 0.9.0.

* gnu/build/file-systems.scm (canonicalize-device-spec)[canonical-title]:
Use 'string->uuid' to check whether SPEC is a UUID.
When SPEC is a string and CANONICAL-TITLE is 'uuid, call 'string->uuid'.
* gnu/system.scm (operating-system-grub.cfg): Add 'root-device'
variable and use it for the "--root=" argument.

* gnu/system/file-systems.scm (%uuid-rx, string->uuid): Move to...
* gnu/build/file-systems.scm (%uuid-rx, string->uuid): ... here.  New
variables.