branch: elpa/gnosis
commit 3d16afb596dc3c39d8217922a877492f84bdffb0
Author: Thanos Apollo <[email protected]>
Commit: Thanos Apollo <[email protected]>
[New Module] gnosis-tl: improve single entry operations for tabulated-list.
---
gnosis-tl.el | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 135 insertions(+)
diff --git a/gnosis-tl.el b/gnosis-tl.el
new file mode 100644
index 0000000000..30825e9380
--- /dev/null
+++ b/gnosis-tl.el
@@ -0,0 +1,135 @@
+;;; gnosis-tl.el --- Fast single-entry tabulated-list operations -*-
lexical-binding: t; -*-
+
+;; Copyright (C) 2023-2026 Free Software Foundation, Inc.
+
+;; Author: Thanos Apollo <[email protected]>
+;; Keywords: extensions
+;; URL: https://thanosapollo.org/projects/gnosis
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Single-entry replace and delete operations for tabulated-list buffers.
+;; Avoids calling `tabulated-list-print' (which re-renders ALL entries)
+;; when only one line needs to change. Full renders still use the
+;; standard `tabulated-list-print'.
+
+;;; Code:
+
+(require 'tabulated-list)
+(require 'cl-lib)
+
+(defvar gnosis-tl-ellipsis "..."
+ "String appended to truncated column text.")
+
+;;; Column spec handling (pure)
+
+(defun gnosis-tl--column-specs (format)
+ "Extract column specs from tabulated-list FORMAT vector.
+Returns list of plists: (:name :width :pad-right :right-align).
+The last column gets pad-right 0 (no trailing space)."
+ (let ((len (length format)))
+ (cl-loop for i below len
+ for col = (aref format i)
+ for props = (nthcdr 3 col)
+ collect (list :name (nth 0 col)
+ :width (nth 1 col)
+ :pad-right (if (= i (1- len)) 0
+ (or (plist-get props :pad-right) 1))
+ :right-align (plist-get props :right-align)))))
+
+;;; Line formatting (pure -- string in, string out)
+
+(defun gnosis-tl--pad-column (text width pad-right right-align)
+ "Pad or truncate TEXT to WIDTH with PAD-RIGHT extra spaces.
+When RIGHT-ALIGN is non-nil, right-align text within WIDTH.
+Truncated text is suffixed with `gnosis-tl-ellipsis'."
+ (let* ((truncated (if (> (string-width text) width)
+ (truncate-string-to-width text width nil nil
+ gnosis-tl-ellipsis)
+ text))
+ (padding (max 0 (- width (string-width truncated)))))
+ (if right-align
+ (concat (make-string padding ?\s) truncated (make-string pad-right
?\s))
+ (concat truncated (make-string (+ padding pad-right) ?\s)))))
+
+(defun gnosis-tl--format-line (id cols specs)
+ "Build a propertized line string for entry ID with COLS and SPECS.
+COLS is the entry's column vector. SPECS is from `gnosis-tl--column-specs'.
+Returns a single string with tabulated-list text properties attached."
+ (let ((parts (list (make-string (or tabulated-list-padding 0) ?\s)))
+ (last-idx (1- (length specs))))
+ (cl-loop for spec in specs
+ for i from 0
+ for raw = (or (aref cols i) "")
+ for text = (if (stringp raw) raw (format "%s" raw))
+ for width = (plist-get spec :width)
+ for segment = (if (= i last-idx)
+ (if (> (string-width text) width)
+ (truncate-string-to-width text width nil nil
+
gnosis-tl-ellipsis)
+ text)
+ (gnosis-tl--pad-column
+ text width
+ (plist-get spec :pad-right)
+ (plist-get spec :right-align)))
+ do (push (propertize segment
+ 'tabulated-list-column-name
+ (plist-get spec :name))
+ parts))
+ (let ((line (concat (apply #'concat (nreverse parts)) "\n")))
+ (add-text-properties 0 (length line)
+ `(tabulated-list-id ,id
+ tabulated-list-entry ,cols)
+ line)
+ line)))
+
+;;; Single-entry buffer operations
+
+(defun gnosis-tl-replace-entry (id new-cols)
+ "Replace the displayed line for entry ID with NEW-COLS in place.
+NEW-COLS is the column vector for the entry.
+Point is preserved via `save-excursion'."
+ (let ((inhibit-read-only t)
+ (specs (gnosis-tl--column-specs tabulated-list-format)))
+ (save-excursion
+ (goto-char (point-min))
+ (while (and (not (eobp))
+ (not (equal (get-text-property (point) 'tabulated-list-id)
id)))
+ (forward-line 1))
+ (when (and (not (eobp))
+ (equal (get-text-property (point) 'tabulated-list-id) id))
+ (let ((beg (line-beginning-position))
+ (end (progn (forward-line 1) (point))))
+ (delete-region beg end)
+ (goto-char beg)
+ (insert (gnosis-tl--format-line id new-cols specs)))))))
+
+(defun gnosis-tl-delete-entry (id)
+ "Delete the displayed line for entry ID from the buffer.
+Point is preserved via `save-excursion'."
+ (let ((inhibit-read-only t))
+ (save-excursion
+ (goto-char (point-min))
+ (while (and (not (eobp))
+ (not (equal (get-text-property (point) 'tabulated-list-id)
id)))
+ (forward-line 1))
+ (when (and (not (eobp))
+ (equal (get-text-property (point) 'tabulated-list-id) id))
+ (delete-region (line-beginning-position)
+ (progn (forward-line 1) (point)))))))
+
+(provide 'gnosis-tl)
+;;; gnosis-tl.el ends here
