branch: externals/mode-line-maker
commit a3c0ca84a1ba00b2e1148acbc9c2c2ab50dacb27
Author: Nicolas P. Rougier <nicolas.roug...@inria.fr>
Commit: Nicolas P. Rougier <nicolas.roug...@inria.fr>
Initial commit
---
LICENSE.txt | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++
README.md | 16 ++
mode-line-maker.el | 379 ++++++++++++++++++++++++++++++
3 files changed, 1069 insertions(+)
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000000..f288702d2f
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
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+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000..bed4ed4fe5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+
+## Mode-line maker
+
+mode-line-maker is a package to ease the creation of mode-line,
+header-line or tab-line. It allows to define the precise alignment
+of the mode-line (on left and right) and splits the mode-line into
+left and right parts, with automatic truncation (when there is too
+much information to display).
+
+## Usage
+
+```emacs-lisp
+(require 'mode-line-maker)
+(setq mode-line-format (mode-line-maker '("%b")
+ '("%3c:%3l")))
+```
diff --git a/mode-line-maker.el b/mode-line-maker.el
new file mode 100644
index 0000000000..e2179c6547
--- /dev/null
+++ b/mode-line-maker.el
@@ -0,0 +1,379 @@
+;;; mode-line-maker.el --- Mode-line helper tools -*- lexical-binding: t -*-
+
+;; Copyright (C) 2025 Nicolas Rougier
+
+;; Maintainer: Nicolas P. Rougier <nicolas.roug...@inria.fr>
+;; URL: https://github.com/rougier/nano-modeline
+;; Version: 0.1
+;; Package-Requires: ((emacs "29.1"))
+;; Keywords: convenience, mode-line, header-line
+
+;; This file is not part of GNU Emacs.
+
+;; This file 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, or (at your option)
+;; any later version.
+
+;; This file 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.
+
+;; For a full copy of the GNU General Public License
+;; see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; mode-line-maker is a package to ease the creation of mode-line,
+;; header-line or tab-line. It allows to define the precise alignment
+;; of the mode-line (on left and right sides) and splits the mode-line
+;; into left and right parts, with automatic truncation (when there is
+;; too much information to display).
+;;
+;; These features come with a price in rendering speed because
+;; everything is computed dynamically. From early benchmarks, you can
+;; expect a significant slowdown (between x2 and x3). Things can get
+;; worse if you use pixel-wise alignment because of the
+;; string-pixel-width call.
+;;
+;; If you only need alignment on left and right, you can directly use
+;; the 'nano-line-make--padding function to get the relevant
+;; prefix/suffix to be prepended/appended to your mode-line.
+
+;; Usage:
+;;
+;; (setq mode-line-format (mode-line-maker '("%b") '("%3c:%3l")))
+
+;;; NEWS:
+;;
+;; Version 0.1
+;; - First version
+
+;;; Code:
+
+(defface mode-line-maker-padding-face
+ `((t (:foreground ,(face-foreground 'default nil 'default)
+ :background ,(face-background 'default nil 'default)
+ :box nil
+ :overline nil
+ :underline nil
+ :inverse-video nil
+ :strike-through nil)))
+ "Face for mode-line padding.")
+
+(defcustom mode-line-maker-alignment '(window . window)
+ "Left and right alignment of the mode-line. Depending on the position of
+the fringe (outside or inside margins), the semantic of the alignment
+changes (see below).
+
+fringes-outside-margins t
+ ┌───┬────────┬───────────────────────────────────────┬────────┬───┬───┐
+ │ 'window alignment │
+ └───┴────────┴───────────────────────────────────────┴────────┴───┴───┘
+ ┌───┬────────┬───────────────────────────────────────┬────────┬───┐
+ │ 'fringe alignment │
+ └───┴────────┴───────────────────────────────────────┴────────┴───┘
+ ┌────────┬───────────────────────────────────────┬────────┐
+ │ 'margin alignment │
+ └────────┴───────────────────────────────────────┴────────┘
+ ┌───────────────────────────────────────┐
+ │ 'text alignment │
+ └───────────────────────────────────────┘
+ ┌───┬────────┬───────────────────────────────────────┬────────┬───┬───┐
+ │ │ │ │ │ │ │
+ │ • │ • │ Text area │ • │ • │ • │
+ │ │ │ │ │ │ │ │ │ │ │ │
+ └─┼─┴────┼───┴───────────────────────────────────────┴───┼────┴─┼─┴─┼─┘
+ │ Left margin Right margin │ │
+ Left fringe Right fringe │
+ Scroll bar
+
+fringes-outside-margins nil
+ ┌───┬────────┬───────────────────────────────────────┬────────┬───┬───┐
+ │ 'window alignment │
+ └───┴────────┴───────────────────────────────────────┴────────┴───┴───┘
+ ┌────────┬───┬───────────────────────────────────────┬───┬────────┐
+ │ 'margin alignment │
+ └────────┴───┴───────────────────────────────────────┴───┴────────┘
+ ┌───┬───────────────────────────────────────┬───┐
+ │ 'fringe alignment │
+ └───┴───────────────────────────────────────┴───┘
+ ┌───────────────────────────────────────┐
+ │ 'text alignment │
+ └───────────────────────────────────────┘
+ ┌────────┬───┬───────────────────────────────────────┬───┬────────┬───┐
+ │ │ │ │ │ │ │
+ │ • │ • │ Text area │ • │ • │ • │
+ │ │ │ │ │ │ │ │ │ │ │ │
+ └───┼────┴─┼─┴───────────────────────────────────────┴─┼─┴────┼───┴─┼─┘
+ │ Left fringe Right fringe │ │
+ Left margin Right margin │
+ Scroll bar
+"
+ :type '(cons (choice :tag "Left"
+ (const window)
+ (const margin)
+ (const fringe)
+ (const text))
+ (choice :tag "Right"
+ (const window)
+ (const margin)
+ (const fringe)
+ (const text))))
+
+(defcustom mode-line-maker-truncation-rule 'left
+ "When the concatenation of the left and right parts does not fit the
+mode-line, they needs to be truncated. Depending on the truncation rule,
+ left part, right part or both can be truncated. Right part is truncated
+ on the left and left part is truncated on the right."
+ :type '(choice (const left)
+ (const right)
+ (const both)))
+
+(defun mode-line-maker--truncate-string (string size &optional ellipsis
direction)
+ "Truncate a STRING to SIZE characters, appending or prepending an ELLISPIS
+depending on the DIRECTION ('left or 'right)."
+
+ (let* ((ellipsis (or ellipsis (truncate-string-ellipsis)))
+ (direction (or direction 'right)))
+
+ (cond ;; string is small enough
+ ((<= (length string) size)
+ string)
+
+ ;; ellipsis is already too big
+ ((> (length ellipsis) size)
+ (substring ellipsis 0 size))
+
+ ;; Truncate on right
+ ((eq direction 'right)
+ (concat (substring string 0 (- size (length ellipsis)))
+ ellipsis))
+
+ ;; Truncate on left
+ ((eq direction 'left)
+ (concat ellipsis
+ (substring string (- (length ellipsis) size))))
+
+ ;; Unknown case
+ (t string))))
+
+(defun mode-line-maker--align-to (direction what &optional char-size
pixel-size)
+ "This methods return a display space specification to align some text on
+the DIRECTION ('left or 'right) of WHAT ('window, 'margin, 'fringe or
+'text) with an additional (optional) CHAR-SIZE and PIXEL-SIZE.
+ PIXEL-SIZE alignment is taken into account only for graphics display."
+
+ (let* ((char-size (or char-size 0))
+ (pixel-size (if (display-graphic-p)
+ (or pixel-size 0)
+ 0)))
+ (cond ((eq 'left direction)
+ (cond ((eq what 'window) (if fringes-outside-margins
+ `(space :align-to (+ left-fringe
+ (,pixel-size)
+ ,char-size))
+ `(space :align-to (+ left-margin
+ (,pixel-size)
+ ,char-size))))
+ ((eq what 'fringe) `(space :align-to (+ left-fringe
+ (,pixel-size)
+ ,char-size)))
+ ((eq what 'margin) `(space :align-to (+ left-margin
+ (,pixel-size)
+ ,char-size)))
+ (t `(space :align-to (+ left
+ (,pixel-size)
+ ,char-size)))))
+ ((eq 'right direction)
+ (cond ((eq what 'window) `(space :align-to (+ scroll-bar
+ (1.0 . scroll-bar)
+ (,pixel-size)
+ ,char-size)))
+ ((eq what 'fringe) `(space :align-to (+ right-fringe
+ (1.0 . right-fringe)
+ (,pixel-size)
+ ,char-size)))
+ ((eq what 'margin) `(space :align-to (+ right-margin
+ (1.0 . right-margin)
+ (,pixel-size)
+ ,char-size)))
+ (t `(space :align-to (+ right
+ (,pixel-size)
+ ,char-size))))))))
+
+(defun mode-line-maker--padding-to (&optional left right face)
+ "This function returns the left and right padding to precisely align the
+mode-line (or header-line) to window, margin, fringe or text extents,
+depending on LEFT and RIGHT. LEFT and RIGHT can be constant ('window,
+'fringe, 'margin or 'text) or a cons specifying (what . (char-size
+. pixel-size)). It returns two strings that must be respectively
+prepended and appended to the mode-line (or header-line). An optional
+FACE can be given to be used for the prefix and the suffix."
+
+ (let* ((left (or left (car mode-line-maker-alignment)))
+ (left (if (not (consp left))
+ (cons left '(0 . 0))
+ left))
+ (right (or right (cdr mode-line-maker-alignment)))
+ (right (if (not (consp right))
+ (cons right '(0 . 0))
+ right))
+ (face (or face 'mode-line-maker-padding-face)))
+ (cons
+ (concat
+ (propertize " "
+ 'display (mode-line-maker--align-to 'left 'window))
+ (propertize " "
+ 'display (mode-line-maker--align-to 'left
+ (car left)
+ (cadr left)
+ (cddr left))
+ 'face face))
+ (concat
+ (propertize " "
+ 'display (mode-line-maker--align-to 'right
+ (car right)
+ (cadr right)
+ (cddr right)))
+ (propertize " "
+ 'display (mode-line-maker--align-to 'right 'window)
+ 'face face)))))
+
+(defun mode-line-maker--make (left &optional right alignment pixelwise)
+ "This function builds a mode-line with LEFT on the left and RIGHT on
+the right. It takes care of truncating the left part, the right part
+or both depending on the 'mode-line-maker-truncation-rule"
+
+ (let* ((right (format-mode-line right))
+ (right-width (string-width right))
+
+ (left (format-mode-line left))
+ (left-width (string-width left))
+
+ (rule mode-line-maker-truncation-rule)
+
+ (alignment (or alignment mode-line-maker-alignment))
+ (alignment-left (car alignment))
+ (alignment-right (cdr alignment))
+
+ (margins (window-margins))
+ (margin-left (* (or (car margins) 0) (frame-char-width)))
+ (margin-right (* (or (cdr margins) 0) (frame-char-width)))
+
+ (fringes (window-fringes))
+ (fringe-left (nth 0 fringes))
+ (fringe-right (nth 1 fringes))
+ (fringes-outside (nth 2 fringes))
+
+ (scroll-bar-width (or scroll-bar-width (frame-scroll-bar-width)))
+
+ ;; This does not take margins nor fringes into account
+ (width (window-width))
+
+ ;; Adjust width with margins, fringes and scroll-bar depending on
alignment
+ (extra (+ (if fringes-outside
+ (+ (cond ((or (eq alignment-left 'window)
+ (eq alignment-left 'fringe))
+ (+ margin-left fringe-left))
+ ((eq alignment-left 'margin)
+ (+ margin-left))
+ (t 0))
+ (cond ((eq alignment-right 'window)
+ (+ margin-right fringe-right
scroll-bar-width))
+ ((eq alignment-right 'fringe)
+ (+ margin-right fringe-right))
+ ((eq alignment-right 'fringe)
+ (+ margin-right))
+ (t 0)))
+ (+ (cond ((or (eq alignment-left 'window)
+ (eq alignment-left 'margin))
+ (+ margin-left fringe-left))
+ ((eq alignment-left 'fringe)
+ (+ fringe-left))
+ (t 0))
+ (cond ((eq alignment-right 'window)
+ (+ margin-right fringe-right
scroll-bar-width))
+ ((eq alignment-right 'margin)
+ (+ margin-right fringe-right))
+ ((eq alignment-right 'fringe)
+ (+ fringe-right))
+ (t 0))))))
+
+ ;; Add extra pixel space (converted to char) to the available width
+ (width (+ width (floor (/ extra (frame-char-width)))))
+
+ ;; Space needed vs space available
+ (delta (- width (+ right-width 1 left-width))))
+
+ (when (< delta 0) ;; Truncation is needed
+ (cond
+
+ ;; Truncate left part
+ ((eq rule 'left)
+ ;; mode-line is big enough
+ ;; -> 2 is minimum truncated size for left part
+ ;; -> 1 is for a space between left and right parts
+ (if (<= (+ (length right) 2 1) width)
+ (let ((w (- width right-width 1)))
+ (setq left (mode-line-maker--truncate-string left w nil
'right)))
+ ;; mode-line is not big enough, right part needs to be truncated
+ (let ((w (- width 2 1)))
+ (setq left (mode-line-maker--truncate-string left 2 nil 'right)
+ right (mode-line-maker--truncate-string right w nil
'left)))))
+
+ ;; Truncate right part
+ ((eq rule 'right)
+ ;; mode-line is big enough
+ ;; -> 2 is minimum truncated size for right part
+ ;; -> 1 is for a space between left and right parts
+ (if (<= (+ (length left) 2 1) width)
+ (let ((w (- width left-width 1)))
+ (setq right (mode-line-maker--truncate-string right w nil
'left)))
+ ;; mode-line is not big enough, left part needs to be truncated
+ (let ((w (- width 2 1)))
+ (setq left (mode-line-maker--truncate-string left w nil 'right)
+ right (mode-line-maker--truncate-string right 2 nil
'left)))))
+
+ ;; Truncate both parts (where necessary)
+ ;; 2 x (first letter + ellipsis) and one space between = 5 chars
minimum
+ ((and (eq rule 'both) (>= width 5))
+ (if (< left-width right-width)
+ (let* ((lw (min (/ (1- width) 2) left-width))
+ (rw (- (1- width) lw)))
+ (setq left (mode-line-maker--truncate-string left lw nil
'right)
+ right (mode-line-maker--truncate-string right rw nil
'left)))
+ (let* ((rw (min (/ (1- width) 2) right-width))
+ (lw (- (1- width) rw)))
+ (setq left (mode-line-maker--truncate-string left lw nil 'right)
+ right (mode-line-maker--truncate-string right rw nil
'left)))))
+
+ ;; We cannot build the mode-line (too constrained)
+ ;; -> return a string made of "!"
+ (t (make-string width ?!))))
+
+ (let* ((padding (mode-line-maker--padding-to (car alignment) (cdr
alignment)))
+ (pixel-size (if (and pixelwise (display-graphic-p))
+ (- (string-pixel-width right))
+ 0))
+ (char-size (if (and pixelwise (display-graphic-p))
+ 0
+ (- (string-width right))))
+ (space (mode-line-maker--align-to 'right (cdr alignment) char-size
pixel-size)))
+ (list (car padding)
+ left
+ (propertize " " 'display space)
+ right
+ (cdr padding)))))
+
+
+(defun mode-line-maker (left &optional right alignment pixelwise)
+ "Build a mode-line using LEFT and RIGHT parts with an optional ALIGNMENT
+and PIXELWISE precision. LEFT and RIGHT are list of any valid mode-line
+constructs without."
+
+ `(:eval (mode-line-maker--make ',left ',right ',alignment ,pixelwise)))
+
+(provide 'mode-line-maker)
+;;; mode-line-maker.el ends here
