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diff --git a/emacs/guix-pcomplete.el b/emacs/guix-pcomplete.el new file mode 100644 index 0000000000..fa71dd5e21 --- /dev/null +++ b/emacs/guix-pcomplete.el @@ -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 |