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613 lines
24 KiB
EmacsLisp
613 lines
24 KiB
EmacsLisp
;;; select.el --- lisp portion of standard selection support -*- lexical-binding:t -*-
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;; Copyright (C) 1993-1994, 2001-2019 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: internal
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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 Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Based partially on earlier release by Lucid.
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;; The functionality here is divided in two parts:
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;; - Low-level: gui-get-selection, gui-set-selection, gui-selection-owner-p,
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;; gui-selection-exists-p are the backend-dependent functions meant to access
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;; various kinds of selections (CLIPBOARD, PRIMARY, SECONDARY).
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;; - Higher-level: gui-select-text and gui-selection-value go together to
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;; access the general notion of "GUI selection" for interoperation with other
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;; applications. This can use either the clipboard or the primary selection,
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;; or both or none according to select-enable-clipboard/primary. These are
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;; the default values of interprogram-cut/paste-function.
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;; Additionally, there's gui-get-primary-selection which is used to get the
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;; PRIMARY selection, specifically for mouse-yank-primary.
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;;; Code:
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(defcustom selection-coding-system nil
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"Coding system for communicating with other programs.
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For MS-Windows and MS-DOS:
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When sending or receiving text via selection and clipboard, the text
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is encoded or decoded by this coding system. The default value is
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the current system default encoding on 9x/Me, `utf-16le-dos'
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\(Unicode) on NT/W2K/XP, and `iso-latin-1-dos' on MS-DOS.
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For X Windows:
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When sending text via selection and clipboard, if the target
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data-type matches with the type of this coding system, it is used
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for encoding the text. Otherwise (including the case that this
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variable is nil), a proper coding system is used as below:
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data-type coding system
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--------- -------------
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UTF8_STRING utf-8
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COMPOUND_TEXT compound-text-with-extensions
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STRING iso-latin-1
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C_STRING no-conversion
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When receiving text, if this coding system is non-nil, it is used
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for decoding regardless of the data-type. If this is nil, a
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proper coding system is used according to the data-type as above.
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See also the documentation of the variable `x-select-request-type' how
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to control which data-type to request for receiving text.
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The default value is nil."
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:type 'coding-system
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:group 'mule
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;; Default was compound-text-with-extensions in 22.x (pre-unicode).
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:version "23.1"
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:set (lambda (symbol value)
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(set-selection-coding-system value)
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(set symbol value)))
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(defvar next-selection-coding-system nil
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"Coding system for the next communication with other programs.
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Usually, `selection-coding-system' is used for communicating with
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other programs (X Windows clients or MS Windows programs). But, if this
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variable is set, it is used for the next communication only.
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After the communication, this variable is set to nil.")
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;; Only declared obsolete in 23.3.
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(define-obsolete-function-alias 'x-selection 'x-get-selection "at least 19.34")
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(define-obsolete-variable-alias 'x-select-enable-clipboard
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'select-enable-clipboard "25.1")
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(defcustom select-enable-clipboard t
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"Non-nil means cutting and pasting uses the clipboard.
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This can be in addition to, but in preference to, the primary selection,
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if applicable (i.e. under X11)."
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:type 'boolean
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:group 'killing
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;; The GNU/Linux version changed in 24.1, the MS-Windows version did not.
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:version "24.1")
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(define-obsolete-variable-alias 'x-select-enable-primary
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'select-enable-primary "25.1")
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(defcustom select-enable-primary nil
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"Non-nil means cutting and pasting uses the primary selection.
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The existence of a primary selection depends on the underlying GUI you use.
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E.g. it doesn't exist under MS-Windows."
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:type 'boolean
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:group 'killing
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:version "25.1")
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;; We keep track of the last text selected here, so we can check the
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;; current selection against it, and avoid passing back our own text
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;; from gui-selection-value. We track both
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;; separately in case another X application only sets one of them
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;; we aren't fooled by the PRIMARY or CLIPBOARD selection staying the same.
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(defvar gui--last-selected-text-clipboard nil
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"The value of the CLIPBOARD selection last seen.")
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(defvar gui--last-selected-text-primary nil
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"The value of the PRIMARY selection last seen.")
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(defun gui-select-text (text)
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"Select TEXT, a string, according to the window system.
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if `select-enable-clipboard' is non-nil, copy TEXT to the system's clipboard.
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If `select-enable-primary' is non-nil, put TEXT in the primary selection.
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MS-Windows does not have a \"primary\" selection."
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(when select-enable-primary
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(gui-set-selection 'PRIMARY text)
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(setq gui--last-selected-text-primary text))
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(when select-enable-clipboard
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;; When cutting, the selection is cleared and PRIMARY
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;; set to the empty string. Prevent that, PRIMARY
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;; should not be reset by cut (Bug#16382).
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(setq saved-region-selection text)
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(gui-set-selection 'CLIPBOARD text)
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(setq gui--last-selected-text-clipboard text)))
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(define-obsolete-function-alias 'x-select-text 'gui-select-text "25.1")
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(defcustom x-select-request-type nil
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"Data type request for X selection.
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The value is one of the following data types, a list of them, or nil:
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`COMPOUND_TEXT', `UTF8_STRING', `STRING', `TEXT'
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If the value is one of the above symbols, try only the specified type.
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If the value is a list of them, try each of them in the specified
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order until succeed.
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The value nil is the same as the list (UTF8_STRING COMPOUND_TEXT STRING)."
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:type '(choice (const :tag "Default" nil)
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(const COMPOUND_TEXT)
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(const UTF8_STRING)
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(const STRING)
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(const TEXT)
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(set :tag "List of values"
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(const COMPOUND_TEXT)
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(const UTF8_STRING)
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(const STRING)
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(const TEXT)))
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:group 'killing)
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;; Get a selection value of type TYPE by calling gui-get-selection with
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;; an appropriate DATA-TYPE argument decided by `x-select-request-type'.
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;; The return value is already decoded. If gui-get-selection causes an
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;; error, this function return nil.
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(defun gui--selection-value-internal (type)
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(let ((request-type (if (eq window-system 'x)
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(or x-select-request-type
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'(UTF8_STRING COMPOUND_TEXT STRING))
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'STRING))
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text)
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(with-demoted-errors "gui-get-selection: %S"
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(if (consp request-type)
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(while (and request-type (not text))
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(setq text (gui-get-selection type (car request-type)))
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(setq request-type (cdr request-type)))
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(setq text (gui-get-selection type request-type))))
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(if text
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(remove-text-properties 0 (length text) '(foreign-selection nil) text))
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text))
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(defun gui-selection-value ()
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(let ((clip-text
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(when select-enable-clipboard
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(let ((text (gui--selection-value-internal 'CLIPBOARD)))
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(if (string= text "") (setq text nil))
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;; Check the CLIPBOARD selection for 'newness', is it different
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;; from what we remembered them to be last time we did a
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;; cut/paste operation.
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(prog1
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(unless (equal text gui--last-selected-text-clipboard)
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text)
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(setq gui--last-selected-text-clipboard text)))))
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(primary-text
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(when select-enable-primary
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(let ((text (gui--selection-value-internal 'PRIMARY)))
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(if (string= text "") (setq text nil))
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;; Check the PRIMARY selection for 'newness', is it different
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;; from what we remembered them to be last time we did a
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;; cut/paste operation.
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(prog1
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(unless (equal text gui--last-selected-text-primary)
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text)
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(setq gui--last-selected-text-primary text))))))
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;; As we have done one selection, clear this now.
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(setq next-selection-coding-system nil)
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;; At this point we have recorded the current values for the
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;; selection from clipboard (if we are supposed to) and primary.
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;; So return the first one that has changed
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;; (which is the first non-null one).
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;;
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;; NOTE: There will be cases where more than one of these has
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;; changed and the new values differ. This indicates that
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;; something like the following has happened since the last time
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;; we looked at the selections: Application X set all the
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;; selections, then Application Y set only one of them.
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;; In this case since we don't have
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;; timestamps there is no way to know what the 'correct' value to
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;; return is. The nice thing to do would be to tell the user we
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;; saw multiple possible selections and ask the user which was the
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;; one they wanted.
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(or clip-text primary-text)
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))
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(define-obsolete-function-alias 'x-selection-value 'gui-selection-value "25.1")
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(defun x-get-clipboard ()
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"Return text pasted to the clipboard."
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(declare (obsolete gui-get-selection "25.1"))
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(gui-backend-get-selection 'CLIPBOARD 'STRING))
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(defun gui-get-primary-selection ()
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"Return the PRIMARY selection, or the best emulation thereof."
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(or (gui--selection-value-internal 'PRIMARY)
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(and (fboundp 'w32-get-selection-value)
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(eq (framep (selected-frame)) 'w32)
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;; MS-Windows emulates PRIMARY in x-get-selection, but only
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;; within the Emacs session, so consult the clipboard if
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;; primary is not found.
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(w32-get-selection-value))
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(error "No selection is available")))
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(define-obsolete-function-alias 'x-get-selection-value
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'gui-get-primary-selection "25.1")
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;;; Lower-level, backend dependent selection handling.
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(cl-defgeneric gui-backend-get-selection (_selection-symbol _target-type)
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"Return selected text.
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SELECTION-SYMBOL is typically `PRIMARY', `SECONDARY', or `CLIPBOARD'.
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\(Those are literal upper-case symbol names, since that's what X expects.)
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TARGET-TYPE is the type of data desired, typically `STRING'."
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nil)
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(cl-defgeneric gui-backend-set-selection (_selection _value)
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"Method to assert a selection of type SELECTION and value VALUE.
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SELECTION is a symbol, typically `PRIMARY', `SECONDARY', or `CLIPBOARD'.
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If VALUE is nil and we own the selection SELECTION, disown it instead.
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Disowning it means there is no such selection.
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\(Those are literal upper-case symbol names, since that's what X expects.)
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VALUE is typically a string, or a cons of two markers, but may be
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anything that the functions on `selection-converter-alist' know about."
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nil)
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(cl-defgeneric gui-backend-selection-owner-p (_selection)
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"Whether the current Emacs process owns the given X Selection.
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The arg should be the name of the selection in question, typically one of
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the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
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\(Those are literal upper-case symbol names, since that's what X expects.)"
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nil)
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(cl-defgeneric gui-backend-selection-exists-p (_selection)
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"Whether there is an owner for the given X Selection.
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The arg should be the name of the selection in question, typically one of
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the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
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\(Those are literal upper-case symbol names, since that's what X expects.)"
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nil)
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(defun gui-get-selection (&optional type data-type)
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"Return the value of an X Windows selection.
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The argument TYPE (default `PRIMARY') says which selection,
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and the argument DATA-TYPE (default `STRING') says
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how to convert the data.
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TYPE may be any symbol \(but nil stands for `PRIMARY'). However,
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only a few symbols are commonly used. They conventionally have
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all upper-case names. The most often used ones, in addition to
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`PRIMARY', are `SECONDARY' and `CLIPBOARD'.
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DATA-TYPE is usually `STRING', but can also be one of the symbols
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in `selection-converter-alist', which see. Window systems other
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than X usually support only a small subset of these symbols, in
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addition to `STRING'; MS-Windows supports `TARGETS', which reports
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the formats available in the clipboard if TYPE is `CLIPBOARD'."
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(let ((data (gui-backend-get-selection (or type 'PRIMARY)
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(or data-type 'STRING))))
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(when (and (stringp data)
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(setq data-type (get-text-property 0 'foreign-selection data)))
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(let ((coding (or next-selection-coding-system
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selection-coding-system
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(pcase data-type
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('UTF8_STRING 'utf-8)
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('COMPOUND_TEXT 'compound-text-with-extensions)
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('C_STRING nil)
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('STRING 'iso-8859-1)
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(_ (error "Unknown selection data type: %S"
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type))))))
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(setq data (if coding (decode-coding-string data coding)
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(string-to-multibyte data))))
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(setq next-selection-coding-system nil)
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(put-text-property 0 (length data) 'foreign-selection data-type data))
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data))
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(define-obsolete-function-alias 'x-get-selection 'gui-get-selection "25.1")
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(defun gui-set-selection (type data)
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"Make an X selection of type TYPE and value DATA.
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The argument TYPE (nil means `PRIMARY') says which selection, and
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DATA specifies the contents. TYPE must be a symbol. \(It can also
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be a string, which stands for the symbol with that name, but this
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is considered obsolete.) DATA may be a string, a symbol, an
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integer (or a cons of two integers or list of two integers).
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The selection may also be a cons of two markers pointing to the same buffer,
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or an overlay. In these cases, the selection is considered to be the text
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between the markers *at whatever time the selection is examined*.
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Thus, editing done in the buffer after you specify the selection
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can alter the effective value of the selection.
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The data may also be a vector of valid non-vector selection values.
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The return value is DATA.
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Interactively, this command sets the primary selection. Without
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prefix argument, it reads the selection in the minibuffer. With
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prefix argument, it uses the text of the region as the selection value.
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Note that on MS-Windows, primary and secondary selections set by Emacs
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are not available to other programs."
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(interactive (if (not current-prefix-arg)
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(list 'PRIMARY (read-string "Set text for pasting: "))
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(list 'PRIMARY (buffer-substring (region-beginning) (region-end)))))
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(if (stringp type) (setq type (intern type)))
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(or (gui--valid-simple-selection-p data)
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(and (vectorp data)
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(let ((valid t))
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(dotimes (i (length data))
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(or (gui--valid-simple-selection-p (aref data i))
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(setq valid nil)))
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valid))
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(signal 'error (list "invalid selection" data)))
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(or type (setq type 'PRIMARY))
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(gui-backend-set-selection type data)
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data)
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(define-obsolete-function-alias 'x-set-selection 'gui-set-selection "25.1")
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(defun gui--valid-simple-selection-p (data)
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(or (bufferp data)
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(and (consp data)
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(markerp (car data))
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(markerp (cdr data))
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(marker-buffer (car data))
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(buffer-live-p (marker-buffer (car data)))
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(eq (marker-buffer (car data))
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(marker-buffer (cdr data))))
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(stringp data)
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(and (overlayp data)
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(overlay-buffer data)
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(buffer-live-p (overlay-buffer data)))
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(symbolp data)
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(integerp data)))
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;; Functions to convert the selection into various other selection types.
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;; Every selection type that Emacs handles is implemented this way, except
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;; for TIMESTAMP, which is a special case.
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(defun xselect--selection-bounds (value)
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"Return bounds of X selection value VALUE.
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The return value is a list (BEG END BUF) if VALUE is a cons of
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two markers or an overlay. Otherwise, it is nil."
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(cond ((bufferp value)
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(with-current-buffer value
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(when (mark t)
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(list (mark t) (point) value))))
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((and (consp value)
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(markerp (car value))
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(markerp (cdr value)))
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(when (and (marker-buffer (car value))
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(buffer-name (marker-buffer (car value)))
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(eq (marker-buffer (car value))
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(marker-buffer (cdr value))))
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(list (marker-position (car value))
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(marker-position (cdr value))
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(marker-buffer (car value)))))
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((overlayp value)
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(when (overlay-buffer value)
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(list (overlay-start value)
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(overlay-end value)
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(overlay-buffer value))))))
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(defun xselect--int-to-cons (n)
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(cons (ash n -16) (logand n 65535)))
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(defun xselect--encode-string (type str &optional can-modify)
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(when str
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;; If TYPE is nil, this is a local request; return STR as-is.
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(if (null type)
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str
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;; Otherwise, encode STR.
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(let ((coding (or next-selection-coding-system
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selection-coding-system)))
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(if coding
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(setq coding (coding-system-base coding)))
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(let ((inhibit-read-only t))
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;; Suppress producing escape sequences for compositions.
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;; But avoid modifying the string if it's a buffer name etc.
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(unless can-modify (setq str (substring str 0)))
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(remove-text-properties 0 (length str) '(composition nil) str)
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;; For X selections, TEXT is a polymorphic target; choose
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;; the actual type from `UTF8_STRING', `COMPOUND_TEXT',
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;; `STRING', and `C_STRING'. On Nextstep, always use UTF-8
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;; (see ns_string_to_pasteboard_internal in nsselect.m).
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(when (eq type 'TEXT)
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(cond
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((featurep 'ns)
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(setq type 'UTF8_STRING))
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((not (multibyte-string-p str))
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(setq type 'C_STRING))
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(t
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(let (non-latin-1 non-unicode eight-bit)
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(mapc #'(lambda (x)
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(if (>= x #x100)
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(if (< x #x110000)
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(setq non-latin-1 t)
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(if (< x #x3FFF80)
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(setq non-unicode t)
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(setq eight-bit t)))))
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str)
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(setq type (if (or non-unicode
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(and
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non-latin-1
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;; If a coding is specified for
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;; selection, and that is
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;; compatible with COMPOUND_TEXT,
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;; use it.
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coding
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(eq (coding-system-get coding :mime-charset)
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'x-ctext)))
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||
'COMPOUND_TEXT
|
||
(if non-latin-1 'UTF8_STRING
|
||
(if eight-bit 'C_STRING
|
||
'STRING))))))))
|
||
(cond
|
||
((eq type 'UTF8_STRING)
|
||
(if (or (not coding)
|
||
(not (eq (coding-system-type coding) 'utf-8)))
|
||
(setq coding 'utf-8))
|
||
(setq str (encode-coding-string str coding)))
|
||
|
||
((eq type 'STRING)
|
||
(if (or (not coding)
|
||
(not (eq (coding-system-type coding) 'charset)))
|
||
(setq coding 'iso-8859-1))
|
||
(setq str (encode-coding-string str coding)))
|
||
|
||
((eq type 'COMPOUND_TEXT)
|
||
(if (or (not coding)
|
||
(not (eq (coding-system-type coding) 'iso-2022)))
|
||
(setq coding 'compound-text-with-extensions))
|
||
(setq str (encode-coding-string str coding)))
|
||
|
||
((eq type 'C_STRING)
|
||
(setq str (string-make-unibyte str)))
|
||
|
||
(t
|
||
(error "Unknown selection type: %S" type)))))
|
||
|
||
;; Most programs are unable to handle NUL bytes in strings.
|
||
(setq str (replace-regexp-in-string "\0" "\\0" str t t))
|
||
|
||
(setq next-selection-coding-system nil)
|
||
(cons type str))))
|
||
|
||
(defun xselect-convert-to-string (_selection type value)
|
||
(let ((str (cond ((stringp value) value)
|
||
((setq value (xselect--selection-bounds value))
|
||
(with-current-buffer (nth 2 value)
|
||
(buffer-substring (nth 0 value)
|
||
(nth 1 value)))))))
|
||
(xselect--encode-string type str t)))
|
||
|
||
(defun xselect-convert-to-length (_selection _type value)
|
||
(let ((len (cond ((stringp value)
|
||
(length value))
|
||
((setq value (xselect--selection-bounds value))
|
||
(abs (- (nth 0 value) (nth 1 value)))))))
|
||
(if len
|
||
(xselect--int-to-cons len))))
|
||
|
||
(defun xselect-convert-to-targets (_selection _type _value)
|
||
;; return a vector of atoms, but remove duplicates first.
|
||
(let* ((all (cons 'TIMESTAMP
|
||
(cons 'MULTIPLE
|
||
(mapcar 'car selection-converter-alist))))
|
||
(rest all))
|
||
(while rest
|
||
(cond ((memq (car rest) (cdr rest))
|
||
(setcdr rest (delq (car rest) (cdr rest))))
|
||
((eq (car (cdr rest)) '_EMACS_INTERNAL) ; shh, it's a secret
|
||
(setcdr rest (cdr (cdr rest))))
|
||
(t
|
||
(setq rest (cdr rest)))))
|
||
(apply 'vector all)))
|
||
|
||
(defun xselect-convert-to-delete (selection _type _value)
|
||
(gui-backend-set-selection selection nil)
|
||
;; A return value of nil means that we do not know how to do this conversion,
|
||
;; and replies with an "error". A return value of NULL means that we have
|
||
;; done the conversion (and any side-effects) but have no value to return.
|
||
'NULL)
|
||
|
||
(defun xselect-convert-to-filename (_selection _type value)
|
||
(when (setq value (xselect--selection-bounds value))
|
||
(xselect--encode-string 'TEXT (buffer-file-name (nth 2 value)))))
|
||
|
||
(defun xselect-convert-to-charpos (_selection _type value)
|
||
(when (setq value (xselect--selection-bounds value))
|
||
(let ((beg (1- (nth 0 value))) ; zero-based
|
||
(end (1- (nth 1 value))))
|
||
(cons 'SPAN (vector (xselect--int-to-cons (min beg end))
|
||
(xselect--int-to-cons (max beg end)))))))
|
||
|
||
(defun xselect-convert-to-lineno (_selection _type value)
|
||
(when (setq value (xselect--selection-bounds value))
|
||
(with-current-buffer (nth 2 value)
|
||
(let ((beg (line-number-at-pos (nth 0 value)))
|
||
(end (line-number-at-pos (nth 1 value))))
|
||
(cons 'SPAN (vector (xselect--int-to-cons (min beg end))
|
||
(xselect--int-to-cons (max beg end))))))))
|
||
|
||
(defun xselect-convert-to-colno (_selection _type value)
|
||
(when (setq value (xselect--selection-bounds value))
|
||
(with-current-buffer (nth 2 value)
|
||
(let ((beg (progn (goto-char (nth 0 value)) (current-column)))
|
||
(end (progn (goto-char (nth 1 value)) (current-column))))
|
||
(cons 'SPAN (vector (xselect--int-to-cons (min beg end))
|
||
(xselect--int-to-cons (max beg end))))))))
|
||
|
||
(defun xselect-convert-to-os (_selection _type _size)
|
||
(xselect--encode-string 'TEXT (symbol-name system-type)))
|
||
|
||
(defun xselect-convert-to-host (_selection _type _size)
|
||
(xselect--encode-string 'TEXT (system-name)))
|
||
|
||
(defun xselect-convert-to-user (_selection _type _size)
|
||
(xselect--encode-string 'TEXT (user-full-name)))
|
||
|
||
(defun xselect-convert-to-class (_selection _type _size)
|
||
"Convert selection to class.
|
||
This function returns the string \"Emacs\"."
|
||
"Emacs")
|
||
|
||
;; We do not try to determine the name Emacs was invoked with,
|
||
;; because it is not clean for a program's behavior to depend on that.
|
||
(defun xselect-convert-to-name (_selection _type _size)
|
||
"Convert selection to name.
|
||
This function returns the string \"emacs\"."
|
||
"emacs")
|
||
|
||
(defun xselect-convert-to-integer (_selection _type value)
|
||
(and (integerp value)
|
||
(xselect--int-to-cons value)))
|
||
|
||
(defun xselect-convert-to-atom (_selection _type value)
|
||
(and (symbolp value) value))
|
||
|
||
(defun xselect-convert-to-identity (_selection _type value) ; used internally
|
||
(vector value))
|
||
|
||
;; Null target that tells clipboard managers we support SAVE_TARGETS
|
||
;; (see freedesktop.org Clipboard Manager spec).
|
||
(defun xselect-convert-to-save-targets (selection _type _value)
|
||
(when (eq selection 'CLIPBOARD)
|
||
'NULL))
|
||
|
||
(setq selection-converter-alist
|
||
'((TEXT . xselect-convert-to-string)
|
||
(COMPOUND_TEXT . xselect-convert-to-string)
|
||
(STRING . xselect-convert-to-string)
|
||
(UTF8_STRING . xselect-convert-to-string)
|
||
(TARGETS . xselect-convert-to-targets)
|
||
(LENGTH . xselect-convert-to-length)
|
||
(DELETE . xselect-convert-to-delete)
|
||
(FILE_NAME . xselect-convert-to-filename)
|
||
(CHARACTER_POSITION . xselect-convert-to-charpos)
|
||
(LINE_NUMBER . xselect-convert-to-lineno)
|
||
(COLUMN_NUMBER . xselect-convert-to-colno)
|
||
(OWNER_OS . xselect-convert-to-os)
|
||
(HOST_NAME . xselect-convert-to-host)
|
||
(USER . xselect-convert-to-user)
|
||
(CLASS . xselect-convert-to-class)
|
||
(NAME . xselect-convert-to-name)
|
||
(ATOM . xselect-convert-to-atom)
|
||
(INTEGER . xselect-convert-to-integer)
|
||
(SAVE_TARGETS . xselect-convert-to-save-targets)
|
||
(_EMACS_INTERNAL . xselect-convert-to-identity)))
|
||
|
||
(provide 'select)
|
||
|
||
;;; select.el ends here
|