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Diffstat (limited to 'emacs/guix-read.el')
| -rw-r--r-- | emacs/guix-read.el | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/emacs/guix-read.el b/emacs/guix-read.el new file mode 100644 index 0000000000..5a7201c3aa --- /dev/null +++ b/emacs/guix-read.el @@ -0,0 +1,176 @@ +;;; guix-read.el --- Minibuffer readers + +;; 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 functions to prompt a user for packages, system +;; types, hash formats and other guix related stuff. + +;;; Code: + +(require 'guix-help-vars) +(require 'guix-utils) +(require 'guix-base) + +(defun guix-read-file-name (prompt &optional dir default-filename + mustmatch initial predicate) + "Read file name. +This function is similar to `read-file-name' except it also +expands the file name." + (expand-file-name (read-file-name prompt dir default-filename + mustmatch initial predicate))) + +(defmacro guix-define-reader (name read-fun completions prompt) + "Define NAME function to read from minibuffer. +READ-FUN may be `completing-read', `completing-read-multiple' or +another function with the same arguments." + `(defun ,name (&optional prompt initial-contents) + (,read-fun ,(if prompt + `(or prompt ,prompt) + 'prompt) + ,completions nil nil initial-contents))) + +(defmacro guix-define-readers (&rest args) + "Define reader functions. + +ARGS should have a form [KEYWORD VALUE] ... The following +keywords are available: + + - `completions-var' - variable used to get completions. + + - `completions-getter' - function used to get completions. + + - `single-reader', `single-prompt' - name of a function to read + a single value, and a prompt for it. + + - `multiple-reader', `multiple-prompt' - name of a function to + read multiple values, and a prompt for it. + + - `multiple-separator' - if specified, another + `<multiple-reader-name>-string' function returning a string + of multiple values separated the specified separator will be + defined." + (let (completions-var + completions-getter + single-reader + single-prompt + multiple-reader + multiple-prompt + multiple-separator) + + ;; Process the keyword args. + (while (keywordp (car args)) + (pcase (pop args) + (`:completions-var (setq completions-var (pop args))) + (`:completions-getter (setq completions-getter (pop args))) + (`:single-reader (setq single-reader (pop args))) + (`:single-prompt (setq single-prompt (pop args))) + (`:multiple-reader (setq multiple-reader (pop args))) + (`:multiple-prompt (setq multiple-prompt (pop args))) + (`:multiple-separator (setq multiple-separator (pop args))) + (_ (pop args)))) + + (let ((completions + (cond ((and completions-var completions-getter) + `(or ,completions-var + (setq ,completions-var + (funcall ',completions-getter)))) + (completions-var + completions-var) + (completions-getter + `(funcall ',completions-getter))))) + `(progn + ,(when (and completions-var + (not (boundp completions-var))) + `(defvar ,completions-var nil)) + + ,(when single-reader + `(guix-define-reader ,single-reader completing-read + ,completions ,single-prompt)) + + ,(when multiple-reader + `(guix-define-reader ,multiple-reader completing-read-multiple + ,completions ,multiple-prompt)) + + ,(when (and multiple-reader multiple-separator) + (let ((name (intern (concat (symbol-name multiple-reader) + "-string")))) + `(defun ,name (&optional prompt initial-contents) + (guix-concat-strings + (,multiple-reader prompt initial-contents) + ,multiple-separator)))))))) + +(guix-define-readers + :completions-var guix-help-system-types + :single-reader guix-read-system-type + :single-prompt "System type: ") + +(guix-define-readers + :completions-var guix-help-source-types + :single-reader guix-read-source-type + :single-prompt "Source type: ") + +(guix-define-readers + :completions-var guix-help-hash-formats + :single-reader guix-read-hash-format + :single-prompt "Hash format: ") + +(guix-define-readers + :completions-var guix-help-refresh-subsets + :single-reader guix-read-refresh-subset + :single-prompt "Refresh subset: ") + +(guix-define-readers + :completions-var guix-help-key-policies + :single-reader guix-read-key-policy + :single-prompt "Key policy: ") + +(guix-define-readers + :completions-var guix-help-elpa-archives + :single-reader guix-read-elpa-archive + :single-prompt "ELPA archive: ") + +(guix-define-readers + :completions-var guix-help-verify-options + :multiple-reader guix-read-verify-options + :multiple-prompt "Verify option,s: " + :multiple-separator ",") + +(guix-define-readers + :completions-getter guix-graph-type-names + :single-reader guix-read-graph-type + :single-prompt "Graph node type: ") + +(guix-define-readers + :completions-getter guix-lint-checker-names + :multiple-reader guix-read-lint-checker-names + :multiple-prompt "Linter,s: " + :multiple-separator ",") + +(guix-define-readers + :completions-getter guix-package-names + :single-reader guix-read-package-name + :single-prompt "Package: " + :multiple-reader guix-read-package-names + :multiple-prompt "Package,s: " + :multiple-separator " ") + +(provide 'guix-read) + +;;; guix-read.el ends here |