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emacs: Add minibuffer readers.

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* emacs/guix-read.el: New file.
* emacs.am (ELFILES): Add it.
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Alex Kost 2015-08-12 21:01:41 +03:00
parent 26476d5852
commit d007d8a10c
2 changed files with 177 additions and 0 deletions
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emacs.am
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@ -29,6 +29,7 @@ ELFILES = \
emacs/guix-messages.el \
emacs/guix-pcomplete.el \
emacs/guix-prettify.el \
emacs/guix-read.el \
emacs/guix-utils.el \
emacs/guix.el

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emacs/guix-read.el Normal file
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@ -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