emacs: Add minibuffer readers.
* emacs/guix-read.el: New file. * emacs.am (ELFILES): Add it.
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Alex Kost
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26476d5852
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emacs.am
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emacs.am
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@ -29,6 +29,7 @@ ELFILES = \
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emacs/guix-messages.el \
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emacs/guix-pcomplete.el \
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emacs/guix-prettify.el \
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emacs/guix-read.el \
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emacs/guix-utils.el \
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emacs/guix.el
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@ -0,0 +1,176 @@
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;;; guix-read.el --- Minibuffer readers
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;; Copyright © 2015 Alex Kost <alezost@gmail.com>
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;; This file is part of GNU Guix.
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;; GNU Guix is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Guix is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file provides functions to prompt a user for packages, system
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;; types, hash formats and other guix related stuff.
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;;; Code:
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(require 'guix-help-vars)
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(require 'guix-utils)
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(require 'guix-base)
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(defun guix-read-file-name (prompt &optional dir default-filename
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mustmatch initial predicate)
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"Read file name.
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This function is similar to `read-file-name' except it also
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expands the file name."
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(expand-file-name (read-file-name prompt dir default-filename
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mustmatch initial predicate)))
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(defmacro guix-define-reader (name read-fun completions prompt)
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"Define NAME function to read from minibuffer.
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READ-FUN may be `completing-read', `completing-read-multiple' or
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another function with the same arguments."
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`(defun ,name (&optional prompt initial-contents)
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(,read-fun ,(if prompt
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`(or prompt ,prompt)
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'prompt)
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,completions nil nil initial-contents)))
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(defmacro guix-define-readers (&rest args)
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"Define reader functions.
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ARGS should have a form [KEYWORD VALUE] ... The following
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keywords are available:
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- `completions-var' - variable used to get completions.
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- `completions-getter' - function used to get completions.
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- `single-reader', `single-prompt' - name of a function to read
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a single value, and a prompt for it.
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- `multiple-reader', `multiple-prompt' - name of a function to
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read multiple values, and a prompt for it.
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- `multiple-separator' - if specified, another
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`<multiple-reader-name>-string' function returning a string
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of multiple values separated the specified separator will be
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defined."
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(let (completions-var
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completions-getter
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single-reader
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single-prompt
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multiple-reader
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multiple-prompt
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multiple-separator)
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;; Process the keyword args.
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(while (keywordp (car args))
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(pcase (pop args)
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(`:completions-var (setq completions-var (pop args)))
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(`:completions-getter (setq completions-getter (pop args)))
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(`:single-reader (setq single-reader (pop args)))
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(`:single-prompt (setq single-prompt (pop args)))
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(`:multiple-reader (setq multiple-reader (pop args)))
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(`:multiple-prompt (setq multiple-prompt (pop args)))
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(`:multiple-separator (setq multiple-separator (pop args)))
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(_ (pop args))))
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(let ((completions
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(cond ((and completions-var completions-getter)
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`(or ,completions-var
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(setq ,completions-var
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(funcall ',completions-getter))))
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(completions-var
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completions-var)
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(completions-getter
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`(funcall ',completions-getter)))))
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`(progn
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,(when (and completions-var
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(not (boundp completions-var)))
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`(defvar ,completions-var nil))
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,(when single-reader
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`(guix-define-reader ,single-reader completing-read
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,completions ,single-prompt))
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,(when multiple-reader
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`(guix-define-reader ,multiple-reader completing-read-multiple
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,completions ,multiple-prompt))
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,(when (and multiple-reader multiple-separator)
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(let ((name (intern (concat (symbol-name multiple-reader)
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"-string"))))
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`(defun ,name (&optional prompt initial-contents)
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(guix-concat-strings
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(,multiple-reader prompt initial-contents)
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,multiple-separator))))))))
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(guix-define-readers
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:completions-var guix-help-system-types
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:single-reader guix-read-system-type
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:single-prompt "System type: ")
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(guix-define-readers
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:completions-var guix-help-source-types
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:single-reader guix-read-source-type
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:single-prompt "Source type: ")
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(guix-define-readers
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:completions-var guix-help-hash-formats
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:single-reader guix-read-hash-format
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:single-prompt "Hash format: ")
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(guix-define-readers
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:completions-var guix-help-refresh-subsets
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:single-reader guix-read-refresh-subset
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:single-prompt "Refresh subset: ")
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(guix-define-readers
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:completions-var guix-help-key-policies
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:single-reader guix-read-key-policy
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:single-prompt "Key policy: ")
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(guix-define-readers
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:completions-var guix-help-elpa-archives
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:single-reader guix-read-elpa-archive
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:single-prompt "ELPA archive: ")
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(guix-define-readers
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:completions-var guix-help-verify-options
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:multiple-reader guix-read-verify-options
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:multiple-prompt "Verify option,s: "
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:multiple-separator ",")
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(guix-define-readers
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:completions-getter guix-graph-type-names
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:single-reader guix-read-graph-type
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:single-prompt "Graph node type: ")
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(guix-define-readers
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:completions-getter guix-lint-checker-names
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:multiple-reader guix-read-lint-checker-names
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:multiple-prompt "Linter,s: "
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:multiple-separator ",")
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(guix-define-readers
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:completions-getter guix-package-names
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:single-reader guix-read-package-name
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:single-prompt "Package: "
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:multiple-reader guix-read-package-names
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:multiple-prompt "Package,s: "
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:multiple-separator " ")
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(provide 'guix-read)
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;;; guix-read.el ends here
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