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emacs: Add shell completions for "guix" command.

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Suggested by Ludovic Courtès <ludo@gnu.org>.

* emacs/guix-pcomplete.el: New file.
* emacs.am (ELFILES): Add it.
* doc/emacs.texi (Emacs Completions): New node.
This commit is contained in:
Alex Kost 2015-06-06 22:19:51 +03:00
parent 132e74fec9
commit 00a8dae2a6
3 changed files with 425 additions and 0 deletions
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32
doc/emacs.texi
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@ -19,6 +19,7 @@ guix package}). Specifically, ``guix.el'' makes it easy to:
* Usage: Emacs Usage. Using the interface.
* Configuration: Emacs Configuration. Configuring the interface.
* Prettify Mode: Emacs Prettify. Abbreviating @file{/gnu/store/@dots{}} file names.
* Completions: Emacs Completions. Completing @command{guix} shell command.
@end menu
@node Emacs Initial Setup
@ -489,3 +490,34 @@ mode hooks (@pxref{Hooks,,, emacs, The GNU Emacs Manual}), for example:
(add-hook 'shell-mode-hook 'guix-prettify-mode)
(add-hook 'dired-mode-hook 'guix-prettify-mode)
@end example
@node Emacs Completions
@subsection Shell Completions
Another feature that becomes available after configuring Emacs interface
(@pxref{Emacs Initial Setup}) is completing of @command{guix}
subcommands, options, packages and other things in @code{shell}
(@pxref{Interactive Shell,,, emacs, The GNU Emacs Manual}) and
@code{eshell} (@pxref{Top,,, eshell, Eshell: The Emacs Shell}).
It works the same way as other completions do. Just press @key{TAB}
when your intuition tells you.
And here are some examples, where pressing @key{TAB} may complete
something:
@itemize @w{}
@item @code{guix pa}@key{TAB}
@item @code{guix package -}@key{TAB}
@item @code{guix package --}@key{TAB}
@item @code{guix package -i gei}@key{TAB}
@item @code{guix build -L/tm}@key{TAB}
@item @code{guix build --sy}@key{TAB}
@item @code{guix build --system=i}@key{TAB}
@item @code{guix system rec}@key{TAB}
@item @code{guix lint --checkers=sy}@key{TAB}
@item @code{guix lint --checkers=synopsis,des}@key{TAB}
@end itemize

1
emacs.am
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@ -26,6 +26,7 @@ ELFILES = \
emacs/guix-info.el \
emacs/guix-list.el \
emacs/guix-messages.el \
emacs/guix-pcomplete.el \
emacs/guix-prettify.el \
emacs/guix-utils.el \
emacs/guix.el

392
emacs/guix-pcomplete.el Normal file
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@ -0,0 +1,392 @@
;;; guix-pcomplete.el --- Functions for completing guix commands -*- 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 completions for "guix" command that may be used in
;; `shell', `eshell' and wherever `pcomplete' works.
;;; Code:
(require 'pcomplete)
(require 'pcmpl-unix)
(require 'cl-lib)
(require 'guix-utils)
;;; Regexps for parsing various "guix ..." outputs
(defvar guix-pcomplete-parse-package-regexp
(rx bol (group (one-or-more (not blank))))
"Regexp used to find names of the packages.")
(defvar guix-pcomplete-parse-command-regexp
(rx bol " "
(group wordchar (one-or-more (or wordchar "-"))))
"Regexp used to find guix commands.
'Command' means any option not prefixed with '-'. For example,
guix subcommand, system action, importer, etc.")
(defvar guix-pcomplete-parse-long-option-regexp
(rx (or " " ", ")
(group "--" (one-or-more (or wordchar "-"))
(zero-or-one "=")))
"Regexp used to find long options.")
(defvar guix-pcomplete-parse-short-option-regexp
(rx bol (one-or-more blank)
"-" (group (not (any "- "))))
"Regexp used to find short options.")
(defvar guix-pcomplete-parse-linter-regexp
(rx bol "- " (group (one-or-more (or wordchar "-"))))
"Regexp used to find 'lint' checkers.")
(defvar guix-pcomplete-parse-regexp-group 1
"Parenthesized expression of regexps used to find commands and
options.")
;;; Non-receivable completions
(defvar guix-pcomplete-systems
'("x86_64-linux" "i686-linux" "armhf-linux" "mips64el-linux")
"List of supported systems.")
(defvar guix-pcomplete-hash-formats
'("nix-base32" "base32" "base16" "hex" "hexadecimal")
"List of supported hash formats.")
(defvar guix-pcomplete-refresh-subsets
'("core" "non-core")
"List of supported 'refresh' subsets.")
(defvar guix-pcomplete-key-policies
'("interactive" "always" "never")
"List of supported key download policies.")
;;; Interacting with guix
(defcustom guix-pcomplete-guix-program (executable-find "guix")
"Name of the 'guix' program.
It is used to find guix commands, options, packages, etc."
:type 'file
:group 'pcomplete
:group 'guix)
(defun guix-pcomplete-run-guix (&rest args)
"Run `guix-pcomplete-guix-program' with ARGS.
Insert the output to the current buffer."
(apply #'call-process
guix-pcomplete-guix-program nil t nil args))
(defun guix-pcomplete-run-guix-and-search (regexp &optional group
&rest args)
"Run `guix-pcomplete-guix-program' with ARGS and search for matches.
Return a list of strings matching REGEXP.
GROUP specifies a parenthesized expression used in REGEXP."
(with-temp-buffer
(apply #'guix-pcomplete-run-guix args)
(goto-char (point-min))
(let (result)
(while (re-search-forward regexp nil t)
(push (match-string-no-properties group) result))
(nreverse result))))
(defmacro guix-pcomplete-define-options-finder (name docstring regexp
&optional filter)
"Define function NAME to receive guix options and commands.
The defined function takes an optional COMMAND argument. This
function will run 'guix COMMAND --help' (or 'guix --help' if
COMMAND is nil) using `guix-pcomplete-run-guix-and-search' and
return its result.
If FILTER is specified, it should be a function. The result is
passed to this FILTER as argument and the result value of this
function call is returned."
(declare (doc-string 2) (indent 1))
`(guix-memoized-defun ,name (&optional command)
,docstring
(let* ((args '("--help"))
(args (if command (cons command args) args))
(res (apply #'guix-pcomplete-run-guix-and-search
,regexp guix-pcomplete-parse-regexp-group args)))
,(if filter
`(funcall ,filter res)
'res))))
(guix-pcomplete-define-options-finder guix-pcomplete-commands
"If COMMAND is nil, return a list of available guix commands.
If COMMAND is non-nil (it should be a string), return available
subcommands, actions, etc. for this guix COMMAND."
guix-pcomplete-parse-command-regexp)
(guix-pcomplete-define-options-finder guix-pcomplete-long-options
"Return a list of available long options for guix COMMAND."
guix-pcomplete-parse-long-option-regexp)
(guix-pcomplete-define-options-finder guix-pcomplete-short-options
"Return a string with available short options for guix COMMAND."
guix-pcomplete-parse-short-option-regexp
(lambda (list)
(mapconcat #'identity list "")))
(guix-memoized-defun guix-pcomplete-all-packages ()
"Return a list of all available Guix packages."
(guix-pcomplete-run-guix-and-search
guix-pcomplete-parse-package-regexp
guix-pcomplete-parse-regexp-group
"package" "--list-available"))
(guix-memoized-defun guix-pcomplete-installed-packages (&optional profile)
"Return a list of Guix packages installed in PROFILE."
(let* ((args (and profile
(list (concat "--profile=" profile))))
(args (append '("package" "--list-installed") args)))
(apply #'guix-pcomplete-run-guix-and-search
guix-pcomplete-parse-package-regexp
guix-pcomplete-parse-regexp-group
args)))
(guix-memoized-defun guix-pcomplete-lint-checkers ()
"Return a list of all available lint checkers."
(guix-pcomplete-run-guix-and-search
guix-pcomplete-parse-linter-regexp
guix-pcomplete-parse-regexp-group
"lint" "--list-checkers"))
;;; Completing
(defvar guix-pcomplete-option-regexp (rx string-start "-")
"Regexp to match an option.")
(defvar guix-pcomplete-long-option-regexp (rx string-start "--")
"Regexp to match a long option.")
(defvar guix-pcomplete-long-option-with-arg-regexp
(rx string-start
(group "--" (one-or-more any)) "="
(group (zero-or-more any)))
"Regexp to match a long option with its argument.
The first parenthesized group defines the option and the second
group - the argument.")
(defvar guix-pcomplete-short-option-with-arg-regexp
(rx string-start
(group "-" (not (any "-")))
(group (zero-or-more any)))
"Regexp to match a short option with its argument.
The first parenthesized group defines the option and the second
group - the argument.")
(defun guix-pcomplete-match-option ()
"Return non-nil, if the current argument is an option."
(pcomplete-match guix-pcomplete-option-regexp 0))
(defun guix-pcomplete-match-long-option ()
"Return non-nil, if the current argument is a long option."
(pcomplete-match guix-pcomplete-long-option-regexp 0))
(defun guix-pcomplete-match-long-option-with-arg ()
"Return non-nil, if the current argument is a long option with value."
(pcomplete-match guix-pcomplete-long-option-with-arg-regexp 0))
(defun guix-pcomplete-match-short-option-with-arg ()
"Return non-nil, if the current argument is a short option with value."
(pcomplete-match guix-pcomplete-short-option-with-arg-regexp 0))
(defun guix-pcomplete-long-option-arg (option args)
"Return a long OPTION's argument from a list of arguments ARGS."
(let* ((re (concat "\\`" option "=\\(.*\\)"))
(args (cl-member-if (lambda (arg)
(string-match re arg))
args))
(cur (car args)))
(when cur
(match-string-no-properties 1 cur))))
(defun guix-pcomplete-short-option-arg (option args)
"Return a short OPTION's argument from a list of arguments ARGS."
(let* ((re (concat "\\`" option "\\(.*\\)"))
(args (cl-member-if (lambda (arg)
(string-match re arg))
args))
(cur (car args)))
(when cur
(let ((arg (match-string-no-properties 1 cur)))
(if (string= "" arg)
(cadr args) ; take the next arg
arg)))))
(defun guix-pcomplete-complete-comma-args (entries)
"Complete comma separated arguments using ENTRIES."
(let ((index pcomplete-index))
(while (= index pcomplete-index)
(let* ((args (if (or (guix-pcomplete-match-long-option-with-arg)
(guix-pcomplete-match-short-option-with-arg))
(pcomplete-match-string 2 0)
(pcomplete-arg 0)))
(input (if (string-match ".*,\\(.*\\)" args)
(match-string-no-properties 1 args)
args)))
(pcomplete-here* entries input)))))
(defun guix-pcomplete-complete-command-arg (command)
"Complete argument for guix COMMAND."
(cond
((member command
'("archive" "build" "environment" "lint" "refresh"))
(while t
(pcomplete-here (guix-pcomplete-all-packages))))
(t (pcomplete-here* (pcomplete-entries)))))
(defun guix-pcomplete-complete-option-arg (command option &optional input)
"Complete argument for COMMAND's OPTION.
INPUT is the current partially completed string."
(cl-flet ((option? (short long)
(or (string= option short)
(string= option long)))
(command? (&rest commands)
(member command commands))
(complete (entries)
(pcomplete-here entries input nil t))
(complete* (entries)
(pcomplete-here* entries input t)))
(cond
((option? "-L" "--load-path")
(complete* (pcomplete-dirs)))
((string= "--key-download" option)
(complete* guix-pcomplete-key-policies))
((command? "package")
(cond
;; For '--install[=]' and '--remove[=]', try to complete a package
;; name (INPUT) after the "=" sign, and then the rest packages
;; separated with spaces.
((option? "-i" "--install")
(complete (guix-pcomplete-all-packages))
(while (not (guix-pcomplete-match-option))
(pcomplete-here (guix-pcomplete-all-packages))))
((option? "-r" "--remove")
(let* ((profile (or (guix-pcomplete-short-option-arg
"-p" pcomplete-args)
(guix-pcomplete-long-option-arg
"--profile" pcomplete-args)))
(profile (and profile (expand-file-name profile))))
(complete (guix-pcomplete-installed-packages profile))
(while (not (guix-pcomplete-match-option))
(pcomplete-here (guix-pcomplete-installed-packages profile)))))
((string= "--show" option)
(complete (guix-pcomplete-all-packages)))
((option? "-p" "--profile")
(complete* (pcomplete-dirs)))
((option? "-m" "--manifest")
(complete* (pcomplete-entries)))))
((and (command? "archive" "build")
(option? "-s" "--system"))
(complete* guix-pcomplete-systems))
((and (command? "build")
(option? "-r" "--root"))
(complete* (pcomplete-entries)))
((and (command? "environment")
(option? "-l" "--load"))
(complete* (pcomplete-entries)))
((and (command? "hash" "download")
(option? "-f" "--format"))
(complete* guix-pcomplete-hash-formats))
((and (command? "lint")
(option? "-c" "--checkers"))
(guix-pcomplete-complete-comma-args
(guix-pcomplete-lint-checkers)))
((and (command? "publish")
(option? "-u" "--user"))
(complete* (pcmpl-unix-user-names)))
((and (command? "refresh")
(option? "-s" "--select"))
(complete* guix-pcomplete-refresh-subsets)))))
(defun guix-pcomplete-complete-options (command)
"Complete options (with their arguments) for guix COMMAND."
(while (guix-pcomplete-match-option)
(let ((index pcomplete-index))
(if (guix-pcomplete-match-long-option)
;; Long options.
(if (guix-pcomplete-match-long-option-with-arg)
(let ((option (pcomplete-match-string 1 0))
(arg (pcomplete-match-string 2 0)))
(guix-pcomplete-complete-option-arg
command option arg))
(pcomplete-here* (guix-pcomplete-long-options command))
;; We support '--opt arg' style (along with '--opt=arg'),
;; because 'guix package --install/--remove' may be used this
;; way. So try to complete an argument after the option has
;; been completed.
(unless (guix-pcomplete-match-option)
(guix-pcomplete-complete-option-arg
command (pcomplete-arg 0 -1))))
;; Short options.
(let ((arg (pcomplete-arg 0)))
(if (> (length arg) 2)
;; Support specifying an argument after a short option without
;; spaces (for example, '-L/tmp/foo').
(guix-pcomplete-complete-option-arg
command
(substring-no-properties arg 0 2)
(substring-no-properties arg 2))
(pcomplete-opt (guix-pcomplete-short-options command))
(guix-pcomplete-complete-option-arg
command (pcomplete-arg 0 -1)))))
;; If there were no completions, move to the next argument and get
;; out if the last argument is achieved.
(when (= index pcomplete-index)
(if (= pcomplete-index pcomplete-last)
(throw 'pcompleted nil)
(pcomplete-next-arg))))))
;;;###autoload
(defun pcomplete/guix ()
"Completion for `guix'."
(let ((commands (guix-pcomplete-commands)))
(pcomplete-here* (cons "--help" commands))
(let ((command (pcomplete-arg 'first 1)))
(when (member command commands)
(guix-pcomplete-complete-options command)
(let ((subcommands (guix-pcomplete-commands command)))
(when subcommands
(pcomplete-here* subcommands)))
(guix-pcomplete-complete-options command)
(guix-pcomplete-complete-command-arg command)))))
(provide 'guix-pcomplete)
;;; guix-pcomplete.el ends here