From: F. Jason Park Date: Wed, 24 Nov 2021 13:35:35 +0000 (-0800) Subject: Put display properties to better use in erc-stamp X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=9f6a9cef97b118d3a6685dfd804332541f9838a3;p=emacs.git Put display properties to better use in erc-stamp * lisp/erc/erc-log.el (erc-log-filter-function): Add new value `erc-stamp-prefix-log-filter'. * lisp/erc/erc-stamp.el (erc-timestamp-use-align-to): Enhance meaning of option to accept numeric value for dynamically aligned right-hand stamps. Use `graphic-display-p' to determine default value even though, as stated in the manual, terminal Emacs also supports the "space" display spec. (erc-stamp-right-margin-width): New option to determine width of right margin when `erc-stamp--display-margin-mode' is active or `erc-timestamp-use-align-to' is set to `margin'. (erc-stamp--display-margin-force): Add new helper function for `erc-stamp--display-margin-mode'. (erc-stamp--adjust-right-margin): New function to adjust width of right margin. (erc-stamp-prefix-log-filter): New value for `erc-log-filter-function' compatible with modules that activate `erc-stamp--display-margin-mode'. (erc-stamp--display-margin-mode): Add internal minor mode to help other modules quickly ensure left-right, display-prop-oriented stamps are showing correctly. Does not support left-hand-only stamps. (erc-insert-aligned): Deprecate function and remove from primary client code path. (erc-stamp--inherited-props): Add internal constant to hold properties that should be inherited from any stamp-bearing message being inserted. (erc-insert-timestamp-right): Account for new display-related values of `erc-timestamp-use-align-to'. * test/lisp/erc/erc-stamp-tests.el (erc-timestamp-use-align-to--nil, erc-timestamp-use-align-to--t): Adjust spacing for new default right-hand stamp, `erc-format-timestamp', which lacks a leading space. (erc-timestamp-use-align-to--integer, erc-timestamp-use-align-to--margin): New tests. (Bug#60936.) --- diff --git a/lisp/erc/erc-log.el b/lisp/erc/erc-log.el index a44437ddcf7..2b58a7c56ed 100644 --- a/lisp/erc/erc-log.el +++ b/lisp/erc/erc-log.el @@ -198,6 +198,7 @@ This should ideally, be a \"catch-all\" coding system, like The function should take one argument, which is the text to filter." :type '(choice (function "Function") + (function-item erc-stamp-prefix-log-filter) (const :tag "No filtering" nil))) diff --git a/lisp/erc/erc-stamp.el b/lisp/erc/erc-stamp.el index 18371320300..8bca9bdb56b 100644 --- a/lisp/erc/erc-stamp.el +++ b/lisp/erc/erc-stamp.el @@ -253,14 +253,110 @@ the correct column." (integer :tag "Column number") (const :tag "Unspecified" nil))) -(defcustom erc-timestamp-use-align-to (eq window-system 'x) +(defcustom erc-timestamp-use-align-to (and (display-graphic-p) t) "If non-nil, use the :align-to display property to align the stamp. This gives better results when variable-width characters (like Asian language characters and math symbols) precede a timestamp. -A side effect of enabling this is that there will only be one -space before a right timestamp in any saved logs." - :type 'boolean) +This option only matters when `erc-insert-timestamp-function' is +set to `erc-insert-timestamp-right' or that option's default, +`erc-insert-timestamp-left-and-right'. If the value is a +positive integer, alignment occurs that many columns from the +right edge. If the value is `margin', the stamp appears in the +right margin when visible. + +Enabling this option produces a side effect in that stamps aren't +indented in saved logs. When its value is an integer, this +option adds a space after the end of a message if the stamp +doesn't already start with one. And when its value is t, it adds +a single space, unconditionally. And while this option never +adds a space when its value is `margin', ERC does offer a +workaround in `erc-stamp-prefix-log-filter', which strips +trailing stamps from messages and puts them before every line." + :type '(choice boolean integer (const margin)) + :package-version '(ERC . "5.6")) ; FIXME sync on release + +(defcustom erc-stamp-right-margin-width nil + "Width in columns of the right margin. +When this option is nil, pretend its value is one column greater +than the `string-width' of the formatted `erc-timestamp-format'. +This option only matters when `erc-timestamp-use-align-to' is set +to `margin'." + :package-version '(ERC . "5.6") ; FIXME sync on release + :type '(choice (const nil) integer)) + +(defun erc-stamp--display-margin-force (orig &rest r) + (let ((erc-timestamp-use-align-to 'margin)) + (apply orig r))) + +(defun erc-stamp--adjust-right-margin (cols) + "Adjust right margin by COLS. +When COLS is zero, reset width to `erc-stamp-right-margin-width' +or one col more than the `string-width' of +`erc-timestamp-format'." + (let ((width + (if (zerop cols) + (or erc-stamp-right-margin-width + (1+ (string-width (or erc-timestamp-last-inserted-right + (erc-format-timestamp + (current-time) + erc-timestamp-format))))) + (+ right-margin-width cols)))) + (setq right-margin-width width + right-fringe-width 0) + (set-window-margins nil left-margin-width width) + (set-window-fringes nil left-fringe-width 0))) + +;;;###autoload +(defun erc-stamp-prefix-log-filter (text) + "Prefix every message in the buffer with a stamp. +Remove trailing stamps as well. For now, hard code the format to +\"ZNC\"-log style, which is [HH:MM:SS]. Expect to be used as a +`erc-log-filter-function' when `erc-timestamp-use-align-to' is +non-nil." + (insert text) + (goto-char (point-min)) + (while + (progn + (when-let* (((< (point) (pos-eol))) + (end (1- (pos-eol))) + ((eq 'erc-timestamp (field-at-pos end))) + (beg (field-beginning end)) + ;; Skip a line that's just a timestamp. + ((> beg (point)))) + (delete-region beg (1+ end))) + (when-let (time (get-text-property (point) 'erc-timestamp)) + (insert (format-time-string "[%H:%M:%S] " time))) + (zerop (forward-line)))) + "") + +(declare-function erc--remove-text-properties "erc" (string)) + +;; If people want to use this directly, we can convert it into +;; a local module. +(define-minor-mode erc-stamp--display-margin-mode + "Internal minor mode for built-in modules integrating with `stamp'. +It binds `erc-timestamp-use-align-to' to `margin' around calls to +`erc-insert-timestamp-function' in the current buffer, and sets +the right window margin to `erc-stamp-right-margin-width'. It +also arranges to remove most text properties when a user kills +message text so that stamps will be visible when yanked." + :interactive nil + (if erc-stamp--display-margin-mode + (progn + (erc-stamp--adjust-right-margin 0) + (add-function :filter-return (local 'filter-buffer-substring-function) + #'erc--remove-text-properties) + (add-function :around (local 'erc-insert-timestamp-function) + #'erc-stamp--display-margin-force)) + (remove-function (local 'filter-buffer-substring-function) + #'erc--remove-text-properties) + (remove-function (local 'erc-insert-timestamp-function) + #'erc-stamp--display-margin-force) + (kill-local-variable 'right-margin-width) + (kill-local-variable 'right-fringe-width) + (set-window-margins nil left-margin-width nil) + (set-window-fringes nil left-fringe-width nil))) (defun erc-insert-timestamp-left (string) "Insert timestamps at the beginning of the line." @@ -279,6 +375,7 @@ space before a right timestamp in any saved logs." If `erc-timestamp-use-align-to' is t, use the :align-to display property to get to the POSth column." + (declare (obsolete "inlined and removed from client code path" "30.1")) (if (not erc-timestamp-use-align-to) (indent-to pos) (insert " ") @@ -289,6 +386,8 @@ property to get to the POSth column." ;; Silence byte-compiler (defvar erc-fill-column) +(defvar erc-stamp--inherited-props '(line-prefix wrap-prefix)) + (defun erc-insert-timestamp-right (string) "Insert timestamp on the right side of the screen. STRING is the timestamp to insert. This function is a possible @@ -340,12 +439,29 @@ printed just after each line's text (no alignment)." ;; some margin of error if what is displayed on the line differs ;; from the number of characters on the line. (setq col (+ col (ceiling (/ (- col (- (point) (line-beginning-position))) 1.6)))) - (if (< col pos) - (erc-insert-aligned string pos) - (newline) - (indent-to pos) - (setq from (point)) - (insert string)) + ;; For compatibility reasons, the `erc-timestamp' field includes + ;; intervening white space unless a hard break is warranted. + (pcase erc-timestamp-use-align-to + ((and 't (guard (< col pos))) + (insert " ") + (put-text-property from (point) 'display `(space :align-to ,pos))) + ((pred integerp) ; (cl-type (integer 0 *)) + (insert " ") + (when (eq ?\s (aref string 0)) + (setq string (substring string 1))) + (let ((s (+ erc-timestamp-use-align-to (string-width string)))) + (put-text-property from (point) 'display + `(space :align-to (- right ,s))))) + ('margin + (put-text-property 0 (length string) + 'display `((margin right-margin) ,string) + string)) + ((guard (>= col pos)) (newline) (indent-to pos) (setq from (point))) + (_ (indent-to pos))) + (insert string) + (dolist (p erc-stamp--inherited-props) + (when-let ((v (get-text-property (1- from) p))) + (put-text-property from (point) p v))) (erc-put-text-property from (point) 'field 'erc-timestamp) (erc-put-text-property from (point) 'rear-nonsticky t) (when erc-timestamp-intangible diff --git a/test/lisp/erc/erc-stamp-tests.el b/test/lisp/erc/erc-stamp-tests.el index 935b9e650b3..01e71e348e0 100644 --- a/test/lisp/erc/erc-stamp-tests.el +++ b/test/lisp/erc/erc-stamp-tests.el @@ -68,7 +68,7 @@ (erc-display-message nil 'notice (current-buffer) "begin")) (goto-char (point-min)) (should (search-forward-regexp - (rx "begin" (+ "\t") (* " ") " [") nil t)) + (rx "begin" (+ "\t") (* " ") "[") nil t)) ;; Field includes intervening spaces (should (eql ?n (char-before (field-beginning (point))))) ;; Timestamp extends to the end of the line @@ -85,9 +85,9 @@ (erc-timestamp-right-column 20)) (erc-display-message nil 'notice (current-buffer) "twenty characters")) - (should (search-forward-regexp (rx bol (+ "\t") (* " ") " [") nil t)) + (should (search-forward-regexp (rx bol (+ "\t") (* " ") "[") nil t)) ;; Field excludes leading whitespace (arguably undesirable). - (should (eql ?\s (char-after (field-beginning (point))))) + (should (eql ?\[ (char-after (field-beginning (point))))) ;; Timestamp extends to the end of the line. (should (eql ?\n (char-after (field-end (point))))))))) @@ -101,7 +101,7 @@ (erc-display-message nil nil (current-buffer) msg))) (goto-char (point-min)) ;; Exactly two spaces, one from format, one added by erc-stamp. - (should (search-forward "msg one [" nil t)) + (should (search-forward "msg one [" nil t)) ;; Field covers space between. (should (eql ?e (char-before (field-beginning (point))))) (should (eql ?\n (char-after (field-end (point)))))) @@ -112,9 +112,67 @@ (let ((msg (erc-format-privmessage "bob" "tttt wwww oooo" nil t))) (erc-display-message nil nil (current-buffer) msg))) ;; Indented to pos (this is arguably a bug). - (should (search-forward-regexp (rx bol (+ "\t") (* " ") " [") nil t)) + (should (search-forward-regexp (rx bol (+ "\t") (* " ") "[") nil t)) ;; Field starts *after* leading space (arguably bad). - (should (eql ?\[ (char-after (1+ (field-beginning (point)))))) + (should (eql ?\[ (char-after (field-beginning (point))))) + (should (eql ?\n (char-after (field-end (point))))))))) + +(ert-deftest erc-timestamp-use-align-to--integer () + (erc-stamp-tests--insert-right + (lambda () + + (ert-info ("integer, normal") + (let ((erc-timestamp-use-align-to 1)) + (let ((msg (erc-format-privmessage "bob" "msg one" nil t))) + (erc-display-message nil nil (current-buffer) msg))) + (goto-char (point-min)) + ;; Space not added because included in format string. + (should (search-forward "msg one [" nil t)) + ;; Field covers space between. + (should (eql ?e (char-before (field-beginning (point))))) + (should (eql ?\n (char-after (field-end (point)))))) + + (ert-info ("integer, overlong (hard wrap)") + (let ((erc-timestamp-use-align-to 1) + (erc-timestamp-right-column 20)) + (let ((msg (erc-format-privmessage "bob" "tttt wwww oooo" nil t))) + (erc-display-message nil nil (current-buffer) msg))) + ;; No hard wrap + (should (search-forward "oooo [" nil t)) + ;; Field starts at leading space. + (should (eql ?\s (char-after (field-beginning (point))))) + (should (eql ?\n (char-after (field-end (point))))))))) + +(ert-deftest erc-timestamp-use-align-to--margin () + (erc-stamp-tests--insert-right + (lambda () + (erc-stamp--display-margin-mode +1) + + (ert-info ("margin, normal") + (let ((erc-timestamp-use-align-to 'margin)) + (let ((msg (erc-format-privmessage "bob" "msg one" nil t))) + (put-text-property 0 (length msg) 'wrap-prefix 10 msg) + (erc-display-message nil nil (current-buffer) msg))) + (goto-char (point-min)) + ;; Space not added (treated as opaque string). + (should (search-forward "msg one[" nil t)) + ;; Field covers stamp alone + (should (eql ?e (char-before (field-beginning (point))))) + ;; Vanity props extended + (should (get-text-property (field-beginning (point)) 'wrap-prefix)) + (should (get-text-property (1+ (field-beginning (point))) 'wrap-prefix)) + (should (get-text-property (1- (field-end (point))) 'wrap-prefix)) + (should (eql ?\n (char-after (field-end (point)))))) + + (ert-info ("margin, overlong (hard wrap)") + (let ((erc-timestamp-use-align-to 'margin) + (erc-timestamp-right-column 20)) + (let ((msg (erc-format-privmessage "bob" "tttt wwww oooo" nil t))) + (erc-display-message nil nil (current-buffer) msg))) + ;; No hard wrap + (should (search-forward "oooo[" nil t)) + ;; Field starts at format string (right bracket) + (should (eql ?\[ (char-after (field-beginning (point))))) (should (eql ?\n (char-after (field-end (point))))))))) ;; This concerns a proposed partial reversal of the changes resulting