585 lines
20 KiB
EmacsLisp
585 lines
20 KiB
EmacsLisp
;;; guix-list.el --- 'List' buffer interface for displaying data -*- lexical-binding: t -*-
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;; Copyright © 2014, 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 'list' buffer interface for displaying an arbitrary
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;; data.
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;;; Code:
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(require 'cl-lib)
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(require 'tabulated-list)
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(require 'guix-buffer)
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(require 'guix-info)
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(require 'guix-entry)
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(require 'guix-utils)
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(guix-define-buffer-type list)
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(defface guix-list-file-name
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'((t :inherit guix-info-file-name))
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"Face used for file names."
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:group 'guix-list-faces)
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(defface guix-list-url
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'((t :inherit guix-info-url))
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"Face used for URLs."
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:group 'guix-list-faces)
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(defface guix-list-time
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'((t :inherit guix-info-time))
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"Face used for time stamps."
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:group 'guix-list-faces)
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(defun guix-list-describe (&optional mark-names)
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"Describe entries marked with a general mark.
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'Describe' means display entries in 'info' buffer.
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If no entries are marked, describe the current entry.
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With prefix argument, describe entries marked with any mark."
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(interactive (list (unless current-prefix-arg '(general))))
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(let* ((ids (or (apply #'guix-list-get-marked-id-list mark-names)
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(list (guix-list-current-id))))
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(count (length ids))
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(entry-type (guix-buffer-current-entry-type)))
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(when (or (<= count (guix-list-describe-warning-count entry-type))
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(y-or-n-p (format "Do you really want to describe %d entries? "
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count)))
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(guix-list-describe-entries entry-type ids))))
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;;; Wrappers for 'list' variables
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(defvar guix-list-data nil
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"Alist with 'list' data.
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This alist is filled by `guix-list-define-interface' macro.")
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(defun guix-list-value (entry-type symbol)
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"Return SYMBOL's value for ENTRY-TYPE from `guix-list-data'."
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(symbol-value (guix-assq-value guix-list-data entry-type symbol)))
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(defun guix-list-param-title (entry-type param)
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"Return column title of an ENTRY-TYPE parameter PARAM."
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(guix-buffer-param-title 'list entry-type param))
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(defun guix-list-format (entry-type)
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"Return column format for ENTRY-TYPE."
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(guix-list-value entry-type 'format))
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(defun guix-list-displayed-params (entry-type)
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"Return a list of ENTRY-TYPE parameters that should be displayed."
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(mapcar #'car (guix-list-format entry-type)))
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(defun guix-list-sort-key (entry-type)
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"Return sort key for ENTRY-TYPE."
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(guix-list-value entry-type 'sort-key))
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(defun guix-list-additional-marks (entry-type)
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"Return alist of additional marks for ENTRY-TYPE."
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(guix-list-value entry-type 'marks))
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(defun guix-list-single-entry? (entry-type)
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"Return non-nil, if a single entry of ENTRY-TYPE should be listed."
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(guix-list-value entry-type 'list-single))
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(defun guix-list-describe-warning-count (entry-type)
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"Return the maximum number of ENTRY-TYPE entries to describe."
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(guix-list-value entry-type 'describe-count))
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(defun guix-list-describe-entries (entry-type ids)
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"Describe ENTRY-TYPE entries with IDS in 'info' buffer"
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(funcall (guix-list-value entry-type 'describe)
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ids))
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;;; Tabulated list internals
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(defun guix-list-sort-numerically (column a b)
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"Compare COLUMN of tabulated entries A and B numerically.
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This function is used for sort predicates for `tabulated-list-format'.
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Return non-nil, if B is bigger than A."
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(cl-flet ((num (entry)
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(string-to-number (aref (cadr entry) column))))
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(> (num b) (num a))))
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(defmacro guix-list-define-numerical-sorter (column)
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"Define numerical sort predicate for COLUMN.
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See `guix-list-sort-numerically' for details."
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(let ((name (intern (format "guix-list-sort-numerically-%d" column)))
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(doc (format "\
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Predicate to sort tabulated list by column %d numerically.
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See `guix-list-sort-numerically' for details."
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column)))
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`(defun ,name (a b)
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,doc
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(guix-list-sort-numerically ,column a b))))
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(defmacro guix-list-define-numerical-sorters (n)
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"Define numerical sort predicates for columns from 0 to N.
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See `guix-list-define-numerical-sorter' for details."
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`(progn
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,@(mapcar (lambda (i)
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`(guix-list-define-numerical-sorter ,i))
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(number-sequence 0 n))))
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(guix-list-define-numerical-sorters 9)
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(defun guix-list-tabulated-sort-key (entry-type)
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"Return ENTRY-TYPE sort key for `tabulated-list-sort-key'."
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(let ((sort-key (guix-list-sort-key entry-type)))
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(and sort-key
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(cons (guix-list-param-title entry-type (car sort-key))
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(cdr sort-key)))))
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(defun guix-list-tabulated-vector (entry-type fun)
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"Call FUN on each column specification for ENTRY-TYPE.
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FUN is applied to column specification as arguments (see
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`guix-list-format').
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Return a vector made of values of FUN calls."
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(apply #'vector
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(mapcar (lambda (col-spec)
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(apply fun col-spec))
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(guix-list-format entry-type))))
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(defun guix-list-tabulated-format (entry-type)
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"Return ENTRY-TYPE list specification for `tabulated-list-format'."
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(guix-list-tabulated-vector
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entry-type
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(lambda (param _ &rest rest-spec)
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(cons (guix-list-param-title entry-type param)
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rest-spec))))
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(defun guix-list-tabulated-entries (entries entry-type)
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"Return a list of ENTRY-TYPE values for `tabulated-list-entries'."
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(mapcar (lambda (entry)
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(list (guix-entry-id entry)
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(guix-list-tabulated-entry entry entry-type)))
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entries))
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(defun guix-list-tabulated-entry (entry entry-type)
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"Return array of values for `tabulated-list-entries'.
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Parameters are taken from ENTRY-TYPE ENTRY."
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(guix-list-tabulated-vector
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entry-type
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(lambda (param fun &rest _)
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(let ((val (guix-entry-value entry param)))
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(if fun
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(funcall fun val entry)
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(guix-get-string val))))))
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;;; Displaying entries
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(defun guix-list-get-display-entries (entry-type &rest args)
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"Search for entries and show them in a 'list' buffer preferably."
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(let ((entries (guix-buffer-get-entries 'list entry-type args)))
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(if (or (null entries) ; = 0
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(cdr entries) ; > 1
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(guix-list-single-entry? entry-type)
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(null (guix-buffer-value 'info entry-type 'show-entries)))
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(guix-buffer-display-entries entries 'list entry-type args 'add)
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(if (equal (guix-buffer-value 'info entry-type 'get-entries)
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(guix-buffer-value 'list entry-type 'get-entries))
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(guix-buffer-display-entries entries 'info entry-type args 'add)
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(guix-buffer-get-display-entries 'info entry-type args 'add)))))
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(defun guix-list-insert-entries (entries entry-type)
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"Print ENTRY-TYPE ENTRIES in the current buffer."
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(setq tabulated-list-entries
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(guix-list-tabulated-entries entries entry-type))
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(tabulated-list-print))
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(defun guix-list-get-one-line (val &optional _)
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"Return one-line string from a multi-line string VAL.
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VAL may be nil."
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(if val
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(guix-get-one-line val)
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(guix-get-string nil)))
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(defun guix-list-get-time (seconds &optional _)
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"Return formatted time string from SECONDS."
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(guix-get-string (guix-get-time-string seconds)
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'guix-list-time))
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(defun guix-list-get-file-name (file-name &optional _)
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"Return FILE-NAME button specification for `tabulated-list-entries'."
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(list file-name
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'face 'guix-list-file-name
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'action (lambda (btn) (find-file (button-label btn)))
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'follow-link t
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'help-echo "Find file"))
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(defun guix-list-get-url (url &optional _)
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"Return URL button specification for `tabulated-list-entries'."
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(list url
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'face 'guix-list-url
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'action (lambda (btn) (browse-url (button-label btn)))
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'follow-link t
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'help-echo "Browse URL"))
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;;; 'List' lines
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(defun guix-list-current-id ()
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"Return ID of the entry at point."
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(or (tabulated-list-get-id)
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(user-error "No entry here")))
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(defun guix-list-current-entry ()
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"Return entry at point."
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(guix-entry-by-id (guix-list-current-id)
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(guix-buffer-current-entries)))
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(defun guix-list-for-each-line (fun &rest args)
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"Call FUN with ARGS for each entry line."
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(or (derived-mode-p 'guix-list-mode)
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(error "The current buffer is not in Guix List mode"))
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(save-excursion
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(goto-char (point-min))
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(while (not (eobp))
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(apply fun args)
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(forward-line))))
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(defun guix-list-fold-lines (fun init)
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"Fold over entry lines in the current list buffer.
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Call FUN with RESULT as argument for each line, using INIT as
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the initial value of RESULT. Return the final result."
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(let ((res init))
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(guix-list-for-each-line
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(lambda () (setq res (funcall fun res))))
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res))
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;;; Marking and sorting
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(defvar-local guix-list-marked nil
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"List of the marked entries.
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Each element of the list has a form:
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(ID MARK-NAME . ARGS)
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ID is an entry ID.
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MARK-NAME is a symbol from `guix-list-marks'.
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ARGS is a list of additional values.")
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(defvar-local guix-list-marks nil
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"Alist of available mark names and mark characters.")
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(defvar guix-list-default-marks
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'((empty . ?\s)
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(general . ?*))
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"Alist of default mark names and mark characters.")
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(defun guix-list-marks (entry-type)
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"Return alist of available marks for ENTRY-TYPE."
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(append guix-list-default-marks
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(guix-list-additional-marks entry-type)))
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(defun guix-list-get-mark (name)
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"Return mark character by its NAME."
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(or (guix-assq-value guix-list-marks name)
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(error "Mark '%S' not found" name)))
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(defun guix-list-get-mark-string (name)
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"Return mark string by its NAME."
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(string (guix-list-get-mark name)))
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(defun guix-list-current-mark ()
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"Return mark character of the current line."
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(char-after (line-beginning-position)))
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(defun guix-list-get-marked (&rest mark-names)
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"Return list of specs of entries marked with any mark from MARK-NAMES.
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Entry specs are elements from `guix-list-marked' list.
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If MARK-NAMES are not specified, use all marks from
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`guix-list-marks' except the `empty' one."
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(or mark-names
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(setq mark-names
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(delq 'empty
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(mapcar #'car guix-list-marks))))
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(cl-remove-if-not (lambda (assoc)
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(memq (cadr assoc) mark-names))
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guix-list-marked))
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(defun guix-list-get-marked-args (mark-name)
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"Return list of (ID . ARGS) elements from lines marked with MARK-NAME.
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See `guix-list-marked' for the meaning of ARGS."
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(mapcar (lambda (spec)
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(let ((id (car spec))
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(args (cddr spec)))
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(cons id args)))
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(guix-list-get-marked mark-name)))
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(defun guix-list-get-marked-id-list (&rest mark-names)
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"Return list of IDs of entries marked with any mark from MARK-NAMES.
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See `guix-list-get-marked' for details."
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(mapcar #'car (apply #'guix-list-get-marked mark-names)))
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(defun guix-list--mark (mark-name &optional advance &rest args)
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"Put a mark on the current line.
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Also add the current entry to `guix-list-marked' using its ID and ARGS.
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MARK-NAME is a symbol from `guix-list-marks'.
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If ADVANCE is non-nil, move forward by one line after marking."
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(let ((id (guix-list-current-id)))
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(if (eq mark-name 'empty)
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(setq guix-list-marked (assq-delete-all id guix-list-marked))
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(let ((assoc (assq id guix-list-marked))
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(val (cons mark-name args)))
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(if assoc
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(setcdr assoc val)
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(push (cons id val) guix-list-marked)))))
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(tabulated-list-put-tag (guix-list-get-mark-string mark-name)
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advance))
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(defun guix-list-mark (&optional arg)
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"Mark the current line and move to the next line.
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With ARG, mark all lines."
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(interactive "P")
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(if arg
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(guix-list-mark-all)
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(guix-list--mark 'general t)))
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(defun guix-list-mark-all (&optional mark-name)
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"Mark all lines with MARK-NAME mark.
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MARK-NAME is a symbol from `guix-list-marks'.
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Interactively, put a general mark on all lines."
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(interactive)
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(or mark-name (setq mark-name 'general))
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(guix-list-for-each-line #'guix-list--mark mark-name))
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(defun guix-list-unmark (&optional arg)
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"Unmark the current line and move to the next line.
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With ARG, unmark all lines."
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(interactive "P")
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(if arg
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(guix-list-unmark-all)
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(guix-list--mark 'empty t)))
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(defun guix-list-unmark-backward ()
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"Move up one line and unmark it."
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(interactive)
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(forward-line -1)
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(guix-list--mark 'empty))
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(defun guix-list-unmark-all ()
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"Unmark all lines."
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(interactive)
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(guix-list-mark-all 'empty))
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(defun guix-list-restore-marks ()
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"Put marks according to `guix-list-marked'."
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(guix-list-for-each-line
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(lambda ()
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(let ((mark-name (car (guix-assq-value guix-list-marked
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(guix-list-current-id)))))
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(tabulated-list-put-tag
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(guix-list-get-mark-string (or mark-name 'empty)))))))
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(defun guix-list-sort (&optional n)
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"Sort guix list entries by the column at point.
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With a numeric prefix argument N, sort the Nth column.
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Same as `tabulated-list-sort', but also restore marks after sorting."
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(interactive "P")
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(tabulated-list-sort n)
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(guix-list-restore-marks))
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;;; Major mode and interface definer
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(defvar guix-list-mode-map
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(let ((map (make-sparse-keymap)))
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(set-keymap-parent
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map (make-composed-keymap guix-buffer-map
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tabulated-list-mode-map))
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(define-key map (kbd "RET") 'guix-list-describe)
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(define-key map (kbd "i") 'guix-list-describe)
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(define-key map (kbd "m") 'guix-list-mark)
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(define-key map (kbd "*") 'guix-list-mark)
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(define-key map (kbd "u") 'guix-list-unmark)
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(define-key map (kbd "DEL") 'guix-list-unmark-backward)
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(define-key map [remap tabulated-list-sort] 'guix-list-sort)
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map)
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"Keymap for `guix-list-mode' buffers.")
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(define-derived-mode guix-list-mode tabulated-list-mode "Guix-List"
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"Parent mode for displaying data in 'list' form.")
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(defun guix-list-mode-initialize (entry-type)
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"Set up the current 'list' buffer for displaying ENTRY-TYPE entries."
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(setq tabulated-list-padding 2
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tabulated-list-format (guix-list-tabulated-format entry-type)
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tabulated-list-sort-key (guix-list-tabulated-sort-key entry-type))
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(setq-local guix-list-marks (guix-list-marks entry-type))
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(tabulated-list-init-header))
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(defmacro guix-list-define-interface (entry-type &rest args)
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"Define 'list' interface for displaying ENTRY-TYPE entries.
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Remaining arguments (ARGS) should have a form [KEYWORD VALUE] ...
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Required keywords:
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- `:format' - default value of the generated
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`guix-ENTRY-TYPE-list-format' variable.
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Optional keywords:
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- `:sort-key' - default value of the generated
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`guix-ENTRY-TYPE-list-sort-key' variable.
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- `:describe-function' - default value of the generated
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`guix-ENTRY-TYPE-describe-function' variable.
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- `:list-single?' - default value of the generated
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`guix-ENTRY-TYPE-list-single' variable.
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- `:marks' - default value of the generated
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`guix-ENTRY-TYPE-list-marks' variable.
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The rest keyword arguments are passed to
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`guix-buffer-define-interface' macro."
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(declare (indent 1))
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(let* ((entry-type-str (symbol-name entry-type))
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(prefix (concat "guix-" entry-type-str "-list"))
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(group (intern prefix))
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(describe-var (intern (concat prefix "-describe-function")))
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(describe-count-var (intern (concat prefix
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"-describe-warning-count")))
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(format-var (intern (concat prefix "-format")))
|
||
(sort-key-var (intern (concat prefix "-sort-key")))
|
||
(list-single-var (intern (concat prefix "-single")))
|
||
(marks-var (intern (concat prefix "-marks"))))
|
||
(guix-keyword-args-let args
|
||
((show-entries-val :show-entries-function)
|
||
(describe-val :describe-function)
|
||
(describe-count-val :describe-count 10)
|
||
(format-val :format)
|
||
(sort-key-val :sort-key)
|
||
(list-single-val :list-single?)
|
||
(marks-val :marks))
|
||
`(progn
|
||
(defcustom ,format-var ,format-val
|
||
,(format "\
|
||
List of format values of the displayed columns.
|
||
Each element of the list has a form:
|
||
|
||
(PARAM VALUE-FUN WIDTH SORT . PROPS)
|
||
|
||
PARAM is a name of '%s' entry parameter.
|
||
|
||
VALUE-FUN may be either nil or a function returning a value that
|
||
will be inserted. The function is called with 2 arguments: the
|
||
first one is the value of the parameter; the second one is an
|
||
entry (alist of parameter names and values).
|
||
|
||
For the meaning of WIDTH, SORT and PROPS, see
|
||
`tabulated-list-format'."
|
||
entry-type-str)
|
||
:type 'sexp
|
||
:group ',group)
|
||
|
||
(defcustom ,sort-key-var ,sort-key-val
|
||
,(format "\
|
||
Default sort key for 'list' buffer with '%s' entries.
|
||
Should be nil (no sort) or have a form:
|
||
|
||
(PARAM . FLIP)
|
||
|
||
PARAM is the name of '%s' entry parameter. For the meaning of
|
||
FLIP, see `tabulated-list-sort-key'."
|
||
entry-type-str entry-type-str)
|
||
:type '(choice (const :tag "No sort" nil)
|
||
(cons symbol boolean))
|
||
:group ',group)
|
||
|
||
(defvar ,marks-var ,marks-val
|
||
,(format "\
|
||
Alist of additional marks for 'list' buffer with '%s' entries.
|
||
Marks from this list are used along with `guix-list-default-marks'."
|
||
entry-type-str))
|
||
|
||
(defcustom ,list-single-var ,list-single-val
|
||
,(format "\
|
||
If non-nil, list '%s' entry even if it is the only matching result.
|
||
If nil, show a single '%s' entry in the 'info' buffer."
|
||
entry-type-str entry-type-str)
|
||
:type 'boolean
|
||
:group ',group)
|
||
|
||
(defcustom ,describe-count-var ,describe-count-val
|
||
,(format "\
|
||
The maximum number of '%s' entries to describe without a warning.
|
||
If a user wants to describe more than this number of marked
|
||
entries, he will be prompted for confirmation.
|
||
See also `guix-list-describe'."
|
||
entry-type-str)
|
||
:type 'integer
|
||
:group ',group)
|
||
|
||
(defvar ,describe-var ,describe-val
|
||
,(format "Function used to describe '%s' entries."
|
||
entry-type-str))
|
||
|
||
(guix-alist-put!
|
||
'((describe . ,describe-var)
|
||
(describe-count . ,describe-count-var)
|
||
(format . ,format-var)
|
||
(sort-key . ,sort-key-var)
|
||
(list-single . ,list-single-var)
|
||
(marks . ,marks-var))
|
||
'guix-list-data ',entry-type)
|
||
|
||
,(if show-entries-val
|
||
`(guix-buffer-define-interface list ,entry-type
|
||
:show-entries-function ,show-entries-val
|
||
,@%foreign-args)
|
||
|
||
(let ((insert-fun (intern (concat prefix "-insert-entries")))
|
||
(mode-init-fun (intern (concat prefix "-mode-initialize"))))
|
||
`(progn
|
||
(defun ,insert-fun (entries)
|
||
,(format "\
|
||
Print '%s' ENTRIES in the current 'list' buffer."
|
||
entry-type-str)
|
||
(guix-list-insert-entries entries ',entry-type))
|
||
|
||
(defun ,mode-init-fun ()
|
||
,(format "\
|
||
Set up the current 'list' buffer for displaying '%s' entries."
|
||
entry-type-str)
|
||
(guix-list-mode-initialize ',entry-type))
|
||
|
||
(guix-buffer-define-interface list ,entry-type
|
||
:insert-entries-function ',insert-fun
|
||
:mode-init-function ',mode-init-fun
|
||
,@%foreign-args))))))))
|
||
|
||
|
||
(defvar guix-list-font-lock-keywords
|
||
(eval-when-compile
|
||
`((,(rx "(" (group "guix-list-define-interface")
|
||
symbol-end)
|
||
. 1))))
|
||
|
||
(font-lock-add-keywords 'emacs-lisp-mode guix-list-font-lock-keywords)
|
||
|
||
(provide 'guix-list)
|
||
|
||
;;; guix-list.el ends here
|