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;Corrected display-fill-column-indicator mode.

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Small corrections in the documentation and code format to merge into master.
This commit is contained in:
Jimmy Aguilar Mena 2019-05-03 19:27:59 +02:00
parent 5b842bd782
commit a336300ccf
6 changed files with 69 additions and 87 deletions
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7
doc/emacs/display.texi
View file

@ -1181,10 +1181,11 @@ When the mode is enabled through the functions
@code{display-fill-column-indicator-mode} or
@code{global-display-fill-column-indicator-mode}, the initialization
functions check if this variable is @code{non-nil}, otherwise the
initialization tries to set it to U+2502 or '|'.
initialization tries to set it to U+2502 or @sampl{|}.
@item fill-column-face
Specifies the face used to display the indicator it inherits its
@item fill-column-indicator
@vindex fill-column-indicator
Specifies the face used to display the indicator. It inherits its
default values from shadow and the default face.
@end table

25
etc/NEWS
View file

@ -340,7 +340,7 @@ longer.
** Multicolor fonts such as "Noto Color Emoji" can be displayed on
Emacs configured with Cairo drawing and linked with cairo >= 1.16.0.
---
+++
** Emacs now optionally displays a fill column indicator.
This is similar to what 'fill-column-indicator' package provides, but
@ -354,28 +354,7 @@ The indicator is not displayed at all in minibuffer windows and
in tooltips, as it is not useful there.
There are 2 new buffer local variables and 1 face to customize this
mode:
*** 'display-fill-column-indicator-column' is the column where the
indicator should be set. It can take positive numerical values for
the column or the special value t. Any other value disables the
indicator. The default value is t.
When the value is t it means that the variable 'fill-column' will
be used.
*** 'display-fill-column-indicator-char' is the character used for the
indicator. This character can be any valid char including unicode
ones if the user's font supports them.
When the mode is enabled throw the functions
'display-fill-column-indicator-mode' and
'global-display-fill-column-indicator-mode', they check if there
is a value non-nil for this variable, otherwise the initialization
tries to set it to U+2502 or '|'.
*** 'fill-column-face' is the face used to display the indicator it
inherits it default values from shadow and the default faces.
mode they are described in the manual "(emacs) Display".
* Editing Changes in Emacs 27.1

11
lisp/cus-start.el
View file

@ -650,11 +650,14 @@ since it could result in memory overflow and make Emacs crash."
"26.1")
(display-fill-column-indicator display-fill-column-indicator
(choice
(const :tag "Off (nil)" :value nil)
(const :tag "On (t)" :value t))
"27.1")
boolean "27.1")
(display-fill-column-indicator-column display-fill-column-indicator
(choice
(const :tag "Use fill-column variable"
:value t)
(const :tag "Fixed column number"
:value 70
:format "%v"))
integer "27.1")
(display-fill-column-indicator-character display-fill-column-indicator
character "27.1")

10
lisp/display-fill-column-indicator.el
View file

@ -1,6 +1,6 @@
;;; display-fill-column-indicator.el --- interface for display-fill-column-indicator -*- lexical-binding: t -*-
;; Copyright (C) 2017-2019 Free Software Foundation, Inc.
;; Copyright (C) 2019 Free Software Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: convenience
@ -37,18 +37,18 @@
;;; Code:
(defgroup display-fill-column-indicator nil
"Display a fill column indicator in th buffer."
"Display a fill column indicator in the buffer."
:group 'convenience
:group 'display)
;;;###autoload
(define-minor-mode display-fill-column-indicator-mode
"Toggle display fill column indicator.
"Toggle display of fill-column indicator.
This uses `display-fill-column-indicator' internally.
To change the position of the column displayed by default,
customize `display-fill-column-indicator-column' you can change the
To change the position of the column displayed by default
customize `display-fill-column-indicator-column'. You can change the
character for the indicator setting `display-fill-column-indicator-character'."
:lighter nil
(if display-fill-column-indicator-mode

10
lisp/faces.el
View file

@ -2501,15 +2501,11 @@ unwanted effects."
:group 'display-line-numbers)
;; Definition stolen from display-line-numbers.
(defface fill-column-face
(defface fill-column-indicator
'((t :inherit (shadow default)))
"Face for displaying fill column indicator line.
"Face for displaying fill column indicator.
This face is used when `display-fill-column-indicator-mode' is
non-nil.
If you customize the font of this face, make sure it is a
monospaced font, otherwise the line's characters will not line
up horizontally."
non-nil."
:version "27.1"
:group 'basic-faces
:group 'display-fill-column-indicator)

93
src/xdisp.c
View file

@ -379,11 +379,14 @@ static Lisp_Object list_of_error;
|| *BYTE_POS_ADDR (IT_BYTEPOS (*it)) == '\t')))) \
/* Test all the conditions needed to print the fill column indicator. */
#define FILL_COLUMN_INDICATOR_NEEDED(it) \
!NILP (Vdisplay_fill_column_indicator) \
&& (it->continuation_lines_width == 0) \
&& (!NILP (Vdisplay_fill_column_indicator_column)) \
&& FIXNATP (Vdisplay_fill_column_indicator_character)
#define FILL_COLUMN_INDICATOR_NEEDED(it) \
Vdisplay_fill_column_indicator \
&& (it->continuation_lines_width == 0) \
&& (!NILP (Vdisplay_fill_column_indicator_column)) \
&& FIXNATP (Vdisplay_fill_column_indicator_character) \
&& ((EQ (Vdisplay_fill_column_indicator_column, Qt) \
&& FIXNATP (BVAR (current_buffer, fill_column))) \
|| (FIXNATP (Vdisplay_fill_column_indicator_column)))
/* True means print newline to stdout before next mini-buffer message. */
@ -20168,17 +20171,16 @@ append_space_for_newline (struct it *it, bool default_face_p)
/* Corner case for when display-fill-column-indicator-mode
is active and the extra character should be added in the
same place than the line */
same place than the line. */
if ((it->w->pseudo_window_p == 0)
&& FILL_COLUMN_INDICATOR_NEEDED(it))
{
int fill_column_indicator_column = -1;
if (EQ (Vdisplay_fill_column_indicator_column, Qt)
&& FIXNATP (BVAR (current_buffer, fill_column)))
if (EQ (Vdisplay_fill_column_indicator_column, Qt))
fill_column_indicator_column =
XFIXNAT (BVAR (current_buffer, fill_column));
else if (FIXNATP (Vdisplay_fill_column_indicator_column))
else
fill_column_indicator_column =
XFIXNAT (Vdisplay_fill_column_indicator_column);
@ -20198,7 +20200,7 @@ append_space_for_newline (struct it *it, bool default_face_p)
it->c = it->char_to_display =
XFIXNAT (Vdisplay_fill_column_indicator_character);
it->face_id =
merge_faces (it->w, Qfill_column_face,
merge_faces (it->w, Qfill_column_indicator,
0, DEFAULT_FACE_ID);
face = FACE_FROM_ID(it->f, it->face_id);
goto produce_glyphs;
@ -20221,8 +20223,8 @@ append_space_for_newline (struct it *it, bool default_face_p)
set. */
if (it->glyph_row->reversed_p
/* But if the appended newline glyph goes all the way to
the end of the row, there will be no stretch glyph,
so leave the box flag set. */
the end of the row, there will be no stretch glyph,
so leave the box flag set. */
&& saved_x + FRAME_COLUMN_WIDTH (it->f) < it->last_visible_x)
it->end_of_box_run_p = false;
@ -20376,7 +20378,7 @@ extend_face_to_end_of_line (struct it *it)
&& !face->stipple
#endif
&& !it->glyph_row->reversed_p
&& NILP (Vdisplay_fill_column_indicator))
&& !Vdisplay_fill_column_indicator)
return;
/* Set the glyph row flag indicating that the face of the last glyph
@ -20431,17 +20433,16 @@ extend_face_to_end_of_line (struct it *it)
/* Display fill column indicator if not in modeline or
toolbar and display fill column indicator mode is
active */
active. */
if ((it->w->pseudo_window_p == 0)
&& FILL_COLUMN_INDICATOR_NEEDED(it))
{
int fill_column_indicator_column = -1;
if (EQ (Vdisplay_fill_column_indicator_column, Qt)
&& FIXNATP (BVAR (current_buffer, fill_column)))
if (EQ (Vdisplay_fill_column_indicator_column, Qt))
fill_column_indicator_column =
XFIXNAT (BVAR (current_buffer, fill_column));
else if (FIXNATP (Vdisplay_fill_column_indicator_column))
else
fill_column_indicator_column =
XFIXNAT (Vdisplay_fill_column_indicator_column);
@ -20466,7 +20467,7 @@ extend_face_to_end_of_line (struct it *it)
Lisp_Object save_object = it->object;
/* The stretch width needs to considet the latter
added glyph */
added glyph. */
const int stretch_width =
column_x - it->current_x - char_width;
@ -20474,34 +20475,35 @@ extend_face_to_end_of_line (struct it *it)
it->avoid_cursor_p = true;
it->object = Qnil;
/* Only generate a stretch glysph if there is distance
between current_x and and the indicator position */
/* Only generate a stretch glyph if there is distance
between current_x and and the indicator position. */
if (stretch_width > 0)
{
int stretch_ascent = (((it->ascent + it->descent)
int stretch_ascent = (((it->ascent + it->descent)
* FONT_BASE (font)) / FONT_HEIGHT (font));
append_stretch_glyph (it, Qnil, stretch_width,
it->ascent + it->descent,
stretch_ascent);
}
/* Generate the glysph indicator only if
append_space_for_newline didn't already. */
/* Generate the glyph indicator only if
append_space_for_newline didn't already. */
if (it->current_x < column_x)
{
it->char_to_display =
XFIXNAT (Vdisplay_fill_column_indicator_character);
it->face_id =
merge_faces (it->w, Qfill_column_face,
merge_faces (it->w, Qfill_column_indicator,
0, DEFAULT_FACE_ID);
PRODUCE_GLYPHS (it);
}
/* Restore the face after the indicator was generated */
/* Restore the face after the indicator was generated. */
it->face_id = saved_face_id;
/* If there is space after the indicator generate an
extra empty glysph to restore the face. */
extra empty glyph to restore the face. Issue was
observed in X systems. */
it->char_to_display = ' ';
PRODUCE_GLYPHS (it);
@ -20514,14 +20516,13 @@ extend_face_to_end_of_line (struct it *it)
}
}
#ifdef HAVE_WINDOW_SYSTEM
if (it->glyph_row->reversed_p)
{
/* Prepend a stretch glyph to the row, such that the
rightmost glyph will be drawn flushed all the way to the
right margin of the window. The stretch glyph that will
occupy the empty space, if any, to the left of the
glyphs. */
glyph. */
struct font *font = face->font ? face->font : FRAME_FONT (f);
struct glyph *row_start = it->glyph_row->glyphs[TEXT_AREA];
struct glyph *row_end = row_start + it->glyph_row->used[TEXT_AREA];
@ -20635,18 +20636,19 @@ extend_face_to_end_of_line (struct it *it)
else
it->face_id = face->id;
/* Display fill-column-line if needed. */
/* Display fill-column indicator if needed. */
if (FILL_COLUMN_INDICATOR_NEEDED(it))
{
int fill_column_indicator_column = -1;
/* Vdisplay_fill_column_indicator_column accepts the special
value t to use the default fill-column variable. */
if (EQ (Vdisplay_fill_column_indicator_column, Qt)
&& FIXNATP (BVAR (current_buffer, fill_column)))
value t to use the default fill-column variable. The
conditions are all defined in the macro
FILL_COLUMN_INDICATOR_NEEDED. */
if (EQ (Vdisplay_fill_column_indicator_column, Qt))
fill_column_indicator_column =
XFIXNAT (BVAR (current_buffer, fill_column)) + it->lnum_pixel_width;
else if (FIXNATP (Vdisplay_fill_column_indicator_column))
else
fill_column_indicator_column =
XFIXNAT (Vdisplay_fill_column_indicator_column) + it->lnum_pixel_width;
@ -20656,7 +20658,7 @@ extend_face_to_end_of_line (struct it *it)
{
const int saved_face = it->face_id;
it->face_id =
merge_faces (it->w, Qfill_column_face, 0, DEFAULT_FACE_ID);
merge_faces (it->w, Qfill_column_indicator, 0, DEFAULT_FACE_ID);
it->c = it->char_to_display =
XFIXNAT (Vdisplay_fill_column_indicator_character);
PRODUCE_GLYPHS (it);
@ -32839,8 +32841,8 @@ be let-bound around code that needs to disable messages temporarily. */);
/* Name of a text property which disables line-number display. */
DEFSYM (Qdisplay_line_numbers_disable, "display-line-numbers-disable");
/* Names of the face used to display fill column indicator character. */
DEFSYM (Qfill_column_face, "fill-column-face");
/* Name of the face used to display fill column indicator character. */
DEFSYM (Qfill_column_indicator, "fill-column-indicator");
/* Name and number of the face used to highlight escape glyphs. */
DEFSYM (Qescape_glyph, "escape-glyph");
@ -33414,25 +33416,26 @@ either `relative' or `visual'. */);
DEFSYM (Qdisplay_line_numbers_widen, "display-line-numbers-widen");
Fmake_variable_buffer_local (Qdisplay_line_numbers_widen);
DEFVAR_LISP ("display-fill-column-indicator", Vdisplay_fill_column_indicator,
DEFVAR_BOOL ("display-fill-column-indicator", Vdisplay_fill_column_indicator,
doc: /* Non-nil means display the fill column indicator. */);
Vdisplay_fill_column_indicator = Qnil;
Vdisplay_fill_column_indicator = false;
DEFSYM (Qdisplay_fill_column_indicator, "display-fill-column-indicator");
Fmake_variable_buffer_local (Qdisplay_fill_column_indicator);
DEFVAR_LISP ("display-fill-column-indicator-column", Vdisplay_fill_column_indicator_column,
doc: /* Column for indicator when `display-fill-column-indicator' is non-nil.
The default value is t which means that the indicator will use the `fill-column' variable.
If a numeric value is set, the indicator will be drawn in that column
independently of the `fill-column' value. */);
doc: /* Column for indicator when `display-fill-column-indicator'
is non-nil. The default value is t which means that the indicator
will use the `fill-column' variable. If it is set to an integer the
indicator will be drawn in that column. */);
Vdisplay_fill_column_indicator_column = Qt;
DEFSYM (Qdisplay_fill_column_indicator_column, "display-fill-column-indicator-column");
Fmake_variable_buffer_local (Qdisplay_fill_column_indicator_column);
DEFVAR_LISP ("display-fill-column-indicator-character", Vdisplay_fill_column_indicator_character,
doc: /* Character to draw the indicator when `display-fill-column-indicator' is non-nil.
The default is U+2502 but a good alternative is (ascii 124) if
the font in fill-column-face does not support Unicode characters. */);
doc: /* Character to draw the indicator when
`display-fill-column-indicator' is non-nil. The default is U+2502 but
a good alternative is (ascii 124) if the font in fill-column-indicator
face does not support Unicode characters. */);
Vdisplay_fill_column_indicator_character = Qnil;
DEFSYM (Qdisplay_fill_column_indicator_character, "display-fill-column-indicator-character");
Fmake_variable_buffer_local (Qdisplay_fill_column_indicator_character);