Add Emacs user interface.

* configure.ac (emacsuidir): New variable.
  (AC_CONFIG_FILES): Add 'emacs/guix-init.el', 'emacs/guix-helper.scm'.
* Makefile.am: Include 'emacs.am'.
* emacs.am: New file.
* doc/emacs.texi: New file.
* doc/guix.texi: Include 'emacs.texi'.
* emacs/guix-backend.el: New file.
* emacs/guix-base.el: New file.
* emacs/guix-helper.scm.in: New file.
* emacs/guix-history.el: New file.
* emacs/guix-info.el: New file.
* emacs/guix-init.el.in: New file.
* emacs/guix-list.el: New file.
* emacs/guix-main.scm: New file.
* emacs/guix-utils.el: New file.
* emacs/guix.el: New file.

1 files changed, 607 insertions, 0 deletions

diff --git a/emacs/guix-base.el b/emacs/guix-base.el
new file mode 100644
index 0000000000..563df496cd
--- /dev/null
+++ b/emacs/guix-base.el
@@ -0,0 +1,607 @@
+;;; guix-base.el --- Common definitions
+
+;; Copyright © 2014 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 some base and common definitions for guix.el
+;; package.
+
+;; List and info buffers have many common patterns that are defined
+;; using `guix-define-buffer-type' macro from this file.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'guix-backend)
+(require 'guix-utils)
+
+
+;;; Profiles
+
+(defvar guix-user-profile
+  (expand-file-name "~/.guix-profile")
+  "User profile.")
+
+(defvar guix-default-profile
+  (concat (or (getenv "NIX_STATE_DIR") "/var/guix")
+          "/profiles/per-user/"
+          (getenv "USER")
+          "/guix-profile")
+  "Default Guix profile.")
+
+(defvar guix-current-profile guix-default-profile
+  "Current profile.")
+
+(defun guix-set-current-profile (path)
+  "Set `guix-current-profile' to PATH.
+Interactively, prompt for PATH.  With prefix, use
+`guix-default-profile'."
+  (interactive
+   (list (if current-prefix-arg
+             guix-default-profile
+           (read-file-name "Set profile: "
+                           (file-name-directory guix-current-profile)))))
+  (let ((path (directory-file-name (expand-file-name path))))
+    (setq guix-current-profile
+          (if (string= path guix-user-profile)
+              guix-default-profile
+            path))
+    (message "Current profile has been set to '%s'."
+             guix-current-profile)))
+
+
+;;; Parameters of the entries
+
+(defvar guix-param-titles
+  '((package
+     (id                . "ID")
+     (name              . "Name")
+     (version           . "Version")
+     (license           . "License")
+     (synopsis          . "Synopsis")
+     (description       . "Description")
+     (home-url          . "Home page")
+     (outputs           . "Outputs")
+     (inputs            . "Inputs")
+     (native-inputs     . "Native inputs")
+     (propagated-inputs . "Propagated inputs")
+     (location          . "Location")
+     (installed         . "Installed"))
+    (installed
+     (path              . "Installed path")
+     (dependencies      . "Dependencies")
+     (output            . "Output"))
+    (generation
+     (id                . "ID")
+     (number            . "Number")
+     (prev-number       . "Previous number")
+     (path              . "Path")
+     (time              . "Time")))
+  "List for defining titles of entry parameters.
+Titles are used for displaying information about entries.
+Each element of the list has a form:
+
+  (ENTRY-TYPE . ((PARAM . TITLE) ...))")
+
+(defun guix-get-param-title (entry-type param)
+  "Return title of an ENTRY-TYPE entry parameter PARAM."
+  (or (guix-get-key-val guix-param-titles
+                        entry-type param)
+      (prog1 (symbol-name param)
+        (message "Couldn't find title for '%S %S'."
+                 entry-type param))))
+
+(defun guix-get-name-spec (name version &optional output)
+  "Return Guix package specification by its NAME, VERSION and OUTPUT."
+  (concat name "-" version
+          (when output (concat ":" output))))
+
+(defun guix-get-full-name (entry &optional output)
+  "Return name specification of the package ENTRY and OUTPUT."
+  (guix-get-name-spec (guix-get-key-val entry 'name)
+                      (guix-get-key-val entry 'version)
+                      output))
+
+(defun guix-get-installed-outputs (entry)
+  "Return list of installed outputs for the package ENTRY."
+  (mapcar (lambda (installed-entry)
+            (guix-get-key-val installed-entry 'output))
+          (guix-get-key-val entry 'installed)))
+
+(defun guix-get-entry-by-id (id entries)
+  "Return entry from ENTRIES by entry ID."
+  (cl-find-if (lambda (entry)
+                (equal id (guix-get-key-val entry 'id)))
+              entries))
+
+
+;;; Location of the packages
+
+(defvar guix-directory nil
+  "Default Guix directory.
+If it is not set by a user, it is set after starting Guile REPL.
+This directory is used to define location of the packages.")
+
+(defun guix-set-directory ()
+  "Set `guix-directory' if needed."
+  (or guix-directory
+      (setq guix-directory
+            (guix-eval-read "%guix-dir"))))
+
+(add-hook 'guix-after-start-repl-hook 'guix-set-directory)
+
+(defun guix-find-location (location)
+  "Go to LOCATION of a package.
+LOCATION is a string of the form:
+
+  \"PATH:LINE:COLUMN\"
+
+If PATH is relative, it is considered to be relative to
+`guix-directory'."
+  (cl-multiple-value-bind (path line col)
+      (split-string location ":")
+    (let ((file (expand-file-name path guix-directory))
+          (line (string-to-number line))
+          (col  (string-to-number col)))
+      (find-file file)
+      (goto-char (point-min))
+      (forward-line (- line 1))
+      (move-to-column col)
+      (recenter 1))))
+
+
+;;; Common definitions for buffer types
+
+(defvar-local guix-entries nil
+  "List of the currently displayed entries.
+Each element of the list is alist with entry info of the
+following form:
+
+  ((PARAM . VAL) ...)
+
+PARAM is a name of the entry parameter.
+VAL is a value of this parameter.")
+(put 'guix-entries 'permanent-local t)
+
+(defvar-local guix-search-type nil
+  "Type of the current search.")
+(put 'guix-search-type 'permanent-local t)
+
+(defvar-local guix-search-vals nil
+  "Values of the current search.")
+(put 'guix-search-vals 'permanent-local t)
+
+(defsubst guix-set-vars (entries search-type search-vals)
+  (setq guix-entries entries
+        guix-search-type search-type
+        guix-search-vals search-vals))
+
+(defmacro guix-define-buffer-type (buf-type entry-type &rest args)
+  "Define common stuff for BUF-TYPE buffers for displaying entries.
+
+ENTRY-TYPE is a type of displayed entries (see
+`guix-get-entries').
+
+In the text below TYPE means ENTRY-TYPE-BUF-TYPE.
+
+This macro defines `guix-TYPE-mode', a custom group, several user
+variables and the following functions:
+
+  - `guix-TYPE-get-params-for-receiving'
+  - `guix-TYPE-revert'
+  - `guix-TYPE-redisplay'
+  - `guix-TYPE-make-history-item'
+  - `guix-TYPE-set'
+  - `guix-TYPE-show'
+  - `guix-TYPE-get-show'
+
+The following stuff should be defined outside this macro:
+
+  - `guix-BUF-TYPE-mode' - parent mode for the defined mode.
+
+  - `guix-BUF-TYPE-insert-entries' - function for inserting
+  entries in the current buffer; it is called with 2 arguments:
+  entries of the form of `guix-entries' and ENTRY-TYPE.
+
+  - `guix-BUF-TYPE-get-displayed-params' - function returning a
+  list of parameters displayed in the current buffer; it is
+  called with ENTRY-TYPE as argument.
+
+  - `guix-TYPE-mode-initialize' (optional) - function for
+  additional mode settings; it is called without arguments.
+
+Remaining argument (ARGS) should have a form [KEYWORD VALUE] ...  The
+following keywords are available:
+
+  - `:required' - default value for the defined
+    `guix-TYPE-required-params' variable.
+
+  - `:history-size' - default value for the defined
+    `guix-TYPE-history-size' variable.
+
+  - `:revert' - default value for the defined
+    `guix-TYPE-revert-no-confirm' variable."
+  (let* ((entry-type-str (symbol-name entry-type))
+         (buf-type-str   (symbol-name buf-type))
+         (Entry-type-str (capitalize entry-type-str))
+         (Buf-type-str   (capitalize buf-type-str))
+         (entry-str      (concat entry-type-str " entries"))
+         (buf-str        (concat buf-type-str " buffer"))
+         (prefix         (concat "guix-" entry-type-str "-" buf-type-str))
+         (group          (intern prefix))
+         (mode-map-str   (concat prefix "-mode-map"))
+         (mode-map       (intern mode-map-str))
+         (parent-mode    (intern (concat "guix-" buf-type-str "-mode")))
+         (mode           (intern (concat prefix "-mode")))
+         (mode-init-fun  (intern (concat prefix "-mode-initialize")))
+         (buf-name-var   (intern (concat prefix "-buffer-name")))
+         (revert-var     (intern (concat prefix "-revert-no-confirm")))
+         (revert-fun     (intern (concat prefix "-revert")))
+         (redisplay-fun  (intern (concat prefix "-redisplay")))
+         (history-var    (intern (concat prefix "-history-size")))
+         (history-fun    (intern (concat prefix "-make-history-item")))
+         (params-var     (intern (concat prefix "-required-params")))
+         (params-fun     (intern (concat prefix "-get-params-for-receiving")))
+         (set-fun        (intern (concat prefix "-set")))
+         (show-fun       (intern (concat prefix "-show")))
+         (get-show-fun   (intern (concat prefix "-get-show")))
+         (revert-val     nil)
+         (history-val    20)
+         (params-val     '(id)))
+
+    ;; Process the keyword args.
+    (while (keywordp (car args))
+      (pcase (pop args)
+	(`:required     (setq params-val (pop args)))
+	(`:history-size (setq history-val (pop args)))
+	(`:revert       (setq revert-val (pop args)))
+	(_ (pop args))))
+
+    `(progn
+       (defgroup ,group nil
+         ,(concat Buf-type-str " buffer with " entry-str ".")
+         :prefix ,(concat prefix "-")
+         :group ',(intern (concat "guix-" buf-type-str)))
+
+       (defcustom ,buf-name-var ,(format "*Guix %s %s*"
+                                         Entry-type-str Buf-type-str)
+         ,(concat "Default name of the " buf-str " for displaying " entry-str ".")
+         :type 'string
+         :group ',group)
+
+       (defcustom ,history-var ,history-val
+         ,(concat "Maximum number of items saved in the history of the " buf-str ".\n"
+                  "If 0, the history is disabled.")
+         :type 'integer
+         :group ',group)
+
+       (defcustom ,revert-var ,revert-val
+         ,(concat "If non-nil, do not ask to confirm for reverting the " buf-str ".")
+         :type 'boolean
+         :group ',group)
+
+       (defvar ,params-var ',params-val
+         ,(concat "List of required " entry-type-str " parameters.\n\n"
+                  "Displayed parameters and parameters from this list are received\n"
+                  "for each " entry-type-str ".\n\n"
+                  "May be a special value `all', in which case all supported\n"
+                  "parameters are received (this may be very slow for a big number\n"
+                  "of entries).\n\n"
+                  "Do not remove `id' from this list as it is required for\n"
+                  "identifying an entry."))
+
+       (define-derived-mode ,mode ,parent-mode ,(concat "Guix-" Buf-type-str)
+         ,(concat "Major mode for displaying information about " entry-str ".\n\n"
+                  "\\{" mode-map-str "}")
+         (setq-local revert-buffer-function ',revert-fun)
+         (setq-local guix-history-size ,history-var)
+         (and (fboundp ',mode-init-fun) (,mode-init-fun)))
+
+       (let ((map ,mode-map))
+         (define-key map (kbd "l") 'guix-history-back)
+         (define-key map (kbd "r") 'guix-history-forward)
+         (define-key map (kbd "g") 'revert-buffer)
+         (define-key map (kbd "R") ',redisplay-fun)
+         (define-key map (kbd "C-c C-z") 'guix-switch-to-repl))
+
+       (defun ,params-fun ()
+         ,(concat "Return " entry-type-str " parameters that should be received.")
+         (unless (equal ,params-var 'all)
+           (cl-union ,params-var
+                     (,(intern (concat "guix-" buf-type-str "-get-displayed-params"))
+                      ',entry-type))))
+
+       (defun ,revert-fun (_ignore-auto noconfirm)
+         "Update information in the current buffer.
+The function is suitable for `revert-buffer-function'.
+See `revert-buffer' for the meaning of NOCONFIRM."
+         (when (or ,revert-var
+                   noconfirm
+                   (y-or-n-p "Update current information? "))
+           (let ((entries (guix-get-entries ',entry-type guix-search-type
+                                            guix-search-vals (,params-fun))))
+             (,set-fun entries guix-search-type guix-search-vals t))))
+
+       (defun ,redisplay-fun ()
+         "Redisplay current information.
+This function will not update the information, use
+\"\\[revert-buffer]\" if you want the full update."
+         (interactive)
+         (,show-fun guix-entries)
+         (guix-result-message guix-entries ',entry-type
+                              guix-search-type guix-search-vals))
+
+       (defun ,history-fun ()
+         "Make and return a history item for the current buffer."
+         (list (lambda (entries search-type search-vals)
+                 (,show-fun entries)
+                 (guix-set-vars entries search-type search-vals)
+                 (guix-result-message entries ',entry-type
+                                      search-type search-vals))
+               guix-entries guix-search-type guix-search-vals))
+
+       (defun ,set-fun (entries search-type search-vals &optional history-replace)
+         ,(concat "Set up the " buf-str " for displaying " entry-str ".\n\n"
+                  "Display ENTRIES, set variables and make history item.\n\n"
+                  "ENTRIES should have a form of `guix-entries'.\n\n"
+                  "See `guix-get-entries' for the meaning of SEARCH-TYPE and\n"
+                  "SEARCH-VALS.\n\n"
+                  "If HISTORY-REPLACE is non-nil, replace current history item,\n"
+                  "otherwise add the new one.")
+         (when entries
+           (let ((buf (if (eq major-mode ',mode)
+                          (current-buffer)
+                        (get-buffer-create ,buf-name-var))))
+             (with-current-buffer buf
+               (,show-fun entries)
+               (guix-set-vars entries search-type search-vals)
+               (funcall (if history-replace
+                            #'guix-history-replace
+                          #'guix-history-add)
+                        (,history-fun)))
+             (pop-to-buffer buf
+                            '((display-buffer-reuse-window
+                               display-buffer-same-window)))))
+         (guix-result-message entries ',entry-type
+                              search-type search-vals))
+
+       (defun ,show-fun (entries)
+         ,(concat "Display " entry-type-str " ENTRIES in the current " buf-str ".")
+         (let ((inhibit-read-only t))
+           (erase-buffer)
+           (,mode)
+           (,(intern (concat "guix-" buf-type-str "-insert-entries"))
+            entries ',entry-type)
+           (goto-char (point-min))))
+
+       (defun ,get-show-fun (search-type &rest search-vals)
+         ,(concat "Search for " entry-str " and show results in the " buf-str ".\n"
+                  "See `guix-get-entries' for the meaning of SEARCH-TYPE and\n"
+                  "SEARCH-VALS.")
+         (let ((entries (guix-get-entries ',entry-type search-type
+                                          search-vals (,params-fun))))
+           (,set-fun entries search-type search-vals))))))
+
+(put 'guix-define-buffer-type 'lisp-indent-function 'defun)
+
+
+;;; Messages
+
+(defvar guix-messages
+  '((package
+     (id
+      (0 "Packages not found.")
+      (1 "")
+      (many "%d packages." count))
+     (name
+      (0 "The package '%s' not found." val)
+      (1 "A single package with name '%s'." val)
+      (many "%d packages with '%s' name." count val))
+     (regexp
+      (0 "No packages matching '%s'." val)
+      (1 "A single package matching '%s'." val)
+      (many "%d packages matching '%s'." count val))
+     (all-available
+      (0 "No packages are available for some reason.")
+      (1 "A single available package (that's strange).")
+      (many "%d available packages." count))
+     (newest-available
+      (0 "No packages are available for some reason.")
+      (1 "A single newest available package (that's strange).")
+      (many "%d newest available packages." count))
+     (installed
+      (0 "No installed packages.")
+      (1 "A single installed package.")
+      (many "%d installed packages." count))
+     (obsolete
+      (0 "No obsolete packages.")
+      (1 "A single obsolete package.")
+      (many "%d obsolete packages." count))
+     (generation
+      (0 "No packages installed in generation %d." val)
+      (1 "A single package installed in generation %d." val)
+      (many "%d packages installed in generation %d." count val)))
+    (generation
+     (id
+      (0 "Generations not found.")
+      (1 "")
+      (many "%d generations." count))
+     (last
+      (0 "No available generations.")
+      (1 "The last generation.")
+      (many "%d last generations." count))
+     (all
+      (0 "No available generations.")
+      (1 "A single available generation.")
+      (many "%d available generations." count)))))
+
+(defun guix-result-message (entries entry-type search-type search-vals)
+  "Display an appropriate message after displaying ENTRIES."
+  (let* ((val (car search-vals))
+         (count (length entries))
+         (count-key (if (> count 1) 'many count))
+         (msg-spec (guix-get-key-val guix-messages
+                                     entry-type search-type count-key))
+         (format (car msg-spec))
+         (args (cdr msg-spec)))
+    (mapc (lambda (subst)
+            (setq args (cl-substitute (car subst) (cdr subst) args)))
+          (list (cons count 'count)
+                (cons val 'val)))
+    (apply #'message format args)))
+
+
+;;; Getting info about packages and generations
+
+(defun guix-get-entries (entry-type search-type search-vals &optional params)
+  "Search for entries of ENTRY-TYPE.
+
+Call an appropriate scheme function and return a list of the
+form of `guix-entries'.
+
+ENTRY-TYPE should be one of the following symbols: `package' or
+`generation'.
+
+SEARCH-TYPE may be one of the following symbols:
+
+- If ENTRY-TYPE is `package': `id', `name', `regexp',
+  `all-available', `newest-available', `installed', `obsolete',
+  `generation'.
+
+- If ENTRY-TYPE is `generation': `id', `last', `all'.
+
+PARAMS is a list of parameters for receiving.  If nil, get
+information with all available parameters."
+  (guix-eval-read (guix-make-guile-expression
+                   'get-entries
+                   guix-current-profile params
+                   entry-type search-type search-vals)))
+
+
+;;; Actions on packages and generations
+
+(defcustom guix-operation-confirm t
+  "If nil, do not prompt to confirm an operation."
+  :type 'boolean
+  :group 'guix)
+
+(defcustom guix-use-substitutes t
+  "If non-nil, use substitutes for the Guix packages."
+  :type 'boolean
+  :group 'guix)
+
+(defvar guix-dry-run nil
+  "If non-nil, do not perform the real actions, just simulate.")
+
+(defvar guix-temp-buffer-name " *Guix temp*"
+  "Name of a buffer used for displaying info before executing operation.")
+
+(defun guix-process-package-actions (&rest actions)
+  "Process package ACTIONS.
+Each action is a list of the form:
+
+  (ACTION-TYPE PACKAGE-SPEC ...)
+
+ACTION-TYPE is one of the following symbols: `install',
+`upgrade', `remove'/`delete'.
+PACKAGE-SPEC should have the following form: (ID [OUTPUT] ...)."
+  (let (install upgrade remove)
+    (mapc (lambda (action)
+            (let ((action-type (car action))
+                  (specs (cdr action)))
+              (cl-case action-type
+                (install (setq install (append install specs)))
+                (upgrade (setq upgrade (append upgrade specs)))
+                ((remove delete) (setq remove (append remove specs))))))
+          actions)
+    (when (guix-continue-package-operation-p
+           :install install :upgrade upgrade :remove remove)
+      (guix-eval-in-repl
+       (guix-make-guile-expression
+        'process-package-actions guix-current-profile
+        :install install :upgrade upgrade :remove remove
+        :use-substitutes? (or guix-use-substitutes 'f)
+        :dry-run? (or guix-dry-run 'f))))))
+
+(cl-defun guix-continue-package-operation-p (&key install upgrade remove)
+  "Return non-nil if a package operation should be continued.
+Ask a user if needed (see `guix-operation-confirm').
+INSTALL, UPGRADE, REMOVE are 'package action specifications'.
+See `guix-process-package-actions' for details."
+  (or (null guix-operation-confirm)
+      (let* ((entries (guix-get-entries
+                       'package 'id
+                       (list (append (mapcar #'car install)
+                                     (mapcar #'car upgrade)
+                                     (mapcar #'car remove)))
+                       '(id name version location)))
+             (install-strings (guix-get-package-strings install entries))
+             (upgrade-strings (guix-get-package-strings upgrade entries))
+             (remove-strings  (guix-get-package-strings remove entries)))
+        (if (or install-strings upgrade-strings remove-strings)
+            (let ((buf (get-buffer-create guix-temp-buffer-name)))
+              (with-current-buffer buf
+                (setq-local cursor-type nil)
+                (setq buffer-read-only nil)
+                (erase-buffer)
+                (guix-insert-package-strings install-strings "install")
+                (guix-insert-package-strings upgrade-strings "upgrade")
+                (guix-insert-package-strings remove-strings "remove")
+                (let ((win (temp-buffer-window-show
+                            buf
+                            '((display-buffer-reuse-window
+                               display-buffer-at-bottom)
+                              (window-height . fit-window-to-buffer)))))
+                  (prog1 (y-or-n-p "Continue operation? ")
+                    (quit-window nil win)))))
+          (message "Nothing to be done.  If the REPL was restarted, information is not up-to-date.")
+          nil))))
+
+(defun guix-get-package-strings (specs entries)
+  "Return short package descriptions for performing package actions.
+See `guix-process-package-actions' for the meaning of SPECS.
+ENTRIES is a list of package entries to get info about packages."
+  (delq nil
+        (mapcar
+         (lambda (spec)
+           (let* ((id (car spec))
+                  (outputs (cdr spec))
+                  (entry (guix-get-entry-by-id id entries)))
+             (when entry
+               (let ((location (guix-get-key-val entry 'location)))
+                 (concat (guix-get-full-name entry)
+                         (when outputs
+                           (concat ":"
+                                   (mapconcat #'identity outputs ",")))
+                         (when location
+                           (concat "\t(" location ")")))))))
+         specs)))
+
+(defun guix-insert-package-strings (strings action)
+  "Insert information STRINGS at point for performing package ACTION."
+  (when strings
+    (insert "Package(s) to " (guix-get-string action 'bold) ":\n")
+    (mapc (lambda (str)
+            (insert "  " str "\n"))
+          strings)
+    (insert "\n")))
+
+(provide 'guix-base)
+
+;;; guix-base.el ends here