From: mohkale@kisara.moe
To: Eli Zaretskii <eliz@gnu.org>, 62994@debbugs.gnu.org
Cc: Mohsin Kaleem <mohkale@kisara.moe>
Subject: bug#62994: [PATCH v3 1/1] Add support for colored and styled underlines on tty frames
Date: Sat, 22 Apr 2023 11:21:46 +0100 [thread overview]
Message-ID: <20230422102146.93003-2-mohkale@kisara.moe> (raw)
In-Reply-To: <20230422102146.93003-1-mohkale@kisara.moe>
From: Mohsin Kaleem <mohkale@kisara.moe>
* src/dispextern.h (face, face_underline_type, syms_of_xfacse,
internal-set-lisp-face-attribute, gui_supports_face_attributes_p):
Add definitions for new underline styles of Double, Dotted and Dashed.
Delete tty_underline_p from the face struct and use just underline going
forward. Add a flag to check whether styled underlines are available.
* lisp/cus-face.el (custom-face-attributes): Add entries for Double,
Dotted and Dashed so they can be set through `customize'.
* src/termchar.c (tty_display_info): Add an entry for the escape
sequence to set the underline style and color on terminal frames.
* src/term.c (init_tty, tty_capable_p, turn_on_face): Read and save the
underline style escape sequence from the Smulx termcap (alternatively if
the Su flag is set use a default sequence). Allow checking for support
of styled underlines in the current terminal frame. Output the necessary
escape sequences to activate a styled underline on turn_on_face; this is
currently only used for the new special underline styles, a default
straight underline will still use the "us" termcap. Output escape
sequence to set underline color when set in the face and supported by
the tty. Save a default value for this sequence on init_tty when styled
underlines are supported.
* src/xfaces.c (tty_supports_face_attributes_p, realize_tty_face):
Assert whether styled underlines are supported by the current terminal
on display-supports-face-attributes-p checks. Populate the correct
underline style and color in the face spec when realizing a face.
---
etc/NEWS | 13 +++++
lisp/cus-face.el | 5 +-
src/dispextern.h | 10 ++--
src/term.c | 54 +++++++++++++++++++--
src/termchar.h | 7 +++
src/xfaces.c | 121 ++++++++++++++++++++++++++++++++++++++++++-----
6 files changed, 190 insertions(+), 20 deletions(-)
diff --git a/etc/NEWS b/etc/NEWS
index 62d2fdcd3a4..b552bb2d75e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1916,6 +1916,19 @@ This command switches to the "*scratch*" buffer. If "*scratch*" doesn't
exist, the command creates it first. You can use this command if you
inadvertently delete the "*scratch*" buffer.
+---
+** Support for 'styled' and 'colored' underline face attributes on TTY frames
+If your terminals termcap or terminfo database entry has the 'Su' or
+'Smulx' capability defined, Emacs will now emit the prescribed escape
+sequence necessary to render faces with styled underlines on TTY
+frames.
+
+Styled underlines are any underlines containing a non-default
+underline style or a color other than the foreground-color.
+The available underline styles for TTY frames are 'double', 'wave',
+'dotted', and 'dashed'. These are currently supported by Kitty,
+libvte, and st (through the undercurl patch) among other terminals.
+
** Debugging
---
diff --git a/lisp/cus-face.el b/lisp/cus-face.el
index ec89b4f7ff6..2d6e6c7b73e 100644
--- a/lisp/cus-face.el
+++ b/lisp/cus-face.el
@@ -141,7 +141,10 @@ custom-face-attributes
(const :format "" :value :style)
(choice :tag "Style"
(const :tag "Line" line)
- (const :tag "Wave" wave))
+ (const :tag "Double" double)
+ (const :tag "Wave" wave)
+ (const :tag "Dotted" dotted)
+ (const :tag "Dashed" dashed))
(const :format "" :value :position)
(choice :tag "Position"
(const :tag "At Default Position" nil)
diff --git a/src/dispextern.h b/src/dispextern.h
index 4dcab113ea2..753bee446f1 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1653,9 +1653,13 @@ #define FONT_TOO_HIGH(ft) \
enum face_underline_type
{
+ /* Note: Order matches the order of the Smulx terminfo extension. */
FACE_NO_UNDERLINE = 0,
FACE_UNDER_LINE,
- FACE_UNDER_WAVE
+ FACE_DOUBLE_UNDER_LINE,
+ FACE_UNDER_WAVE,
+ FACE_DOTTED_UNDER_LINE,
+ FACE_DASHED_UNDER_LINE,
};
/* Structure describing a realized face.
@@ -1737,7 +1741,7 @@ #define FONT_TOO_HIGH(ft) \
ENUM_BF (face_box_type) box : 2;
/* Style of underlining. */
- ENUM_BF (face_underline_type) underline : 2;
+ ENUM_BF (face_underline_type) underline : 3;
/* If `box' above specifies a 3D type, true means use box_color for
drawing shadows. */
@@ -1769,7 +1773,6 @@ #define FONT_TOO_HIGH(ft) \
string meaning the default color of the TTY. */
bool_bf tty_bold_p : 1;
bool_bf tty_italic_p : 1;
- bool_bf tty_underline_p : 1;
bool_bf tty_reverse_p : 1;
bool_bf tty_strike_through_p : 1;
@@ -3361,6 +3364,7 @@ #define TTY_CAP_BOLD 0x04
#define TTY_CAP_DIM 0x08
#define TTY_CAP_ITALIC 0x10
#define TTY_CAP_STRIKE_THROUGH 0x20
+#define TTY_CAP_UNDERLINE_STYLED 0x32 & TTY_CAP_UNDERLINE
\f
/***********************************************************************
diff --git a/src/term.c b/src/term.c
index 53ba2a231e4..b4fb607ee1f 100644
--- a/src/term.c
+++ b/src/term.c
@@ -1948,8 +1948,19 @@ turn_on_face (struct frame *f, int face_id)
OUTPUT1 (tty, tty->TS_enter_dim_mode);
}
- if (face->tty_underline_p && MAY_USE_WITH_COLORS_P (tty, NC_UNDERLINE))
- OUTPUT1_IF (tty, tty->TS_enter_underline_mode);
+ if (face->underline && MAY_USE_WITH_COLORS_P (tty, NC_UNDERLINE))
+ {
+ if (face->underline == FACE_UNDER_LINE
+ || !tty->TF_set_underline_style)
+ OUTPUT1_IF (tty, tty->TS_enter_underline_mode);
+ else if (tty->TF_set_underline_style)
+ {
+ char *p;
+ p = tparam(tty->TF_set_underline_style, NULL, 0, face->underline, 0, 0, 0);
+ OUTPUT (tty, p);
+ xfree (p);
+ }
+ }
if (face->tty_strike_through_p
&& MAY_USE_WITH_COLORS_P (tty, NC_STRIKE_THROUGH))
@@ -1975,6 +1986,14 @@ turn_on_face (struct frame *f, int face_id)
OUTPUT (tty, p);
xfree (p);
}
+
+ ts = tty->TF_set_underline_color;
+ if (ts && face->underline_color)
+ {
+ p = tparam (ts, NULL, 0, face->underline_color, 0, 0, 0);
+ OUTPUT (tty, p);
+ xfree (p);
+ }
}
}
@@ -1995,7 +2014,7 @@ turn_off_face (struct frame *f, int face_id)
if (face->tty_bold_p
|| face->tty_italic_p
|| face->tty_reverse_p
- || face->tty_underline_p
+ || face->underline
|| face->tty_strike_through_p)
{
OUTPUT1_IF (tty, tty->TS_exit_attribute_mode);
@@ -2007,7 +2026,7 @@ turn_off_face (struct frame *f, int face_id)
{
/* If we don't have "me" we can only have those appearances
that have exit sequences defined. */
- if (face->tty_underline_p)
+ if (face->underline)
OUTPUT_IF (tty, tty->TS_exit_underline_mode);
}
@@ -2036,6 +2055,9 @@ #define TTY_CAPABLE_P_TRY(tty, cap, TS, NC_bit) \
TTY_CAPABLE_P_TRY (tty,
TTY_CAP_UNDERLINE, tty->TS_enter_underline_mode,
NC_UNDERLINE);
+ TTY_CAPABLE_P_TRY (tty,
+ TTY_CAP_UNDERLINE_STYLED, tty->TF_set_underline_style,
+ NC_UNDERLINE);
TTY_CAPABLE_P_TRY (tty,
TTY_CAP_BOLD, tty->TS_enter_bold_mode, NC_BOLD);
TTY_CAPABLE_P_TRY (tty,
@@ -4250,6 +4272,30 @@ init_tty (const char *name, const char *terminal_type, bool must_succeed)
tty->TF_underscore = tgetflag ("ul");
tty->TF_teleray = tgetflag ("xt");
+ /* Styled underlines. Support for this is provided either by the
+ escape sequence in Smulx or the Su flag. The latter results in a
+ common default escape sequence and is not recommended. */
+#ifdef TERMINFO
+ tty->TF_set_underline_style = tigetstr("Smulx");
+ if (tty->TF_set_underline_style == (char *) (intptr_t) -1)
+ tty->TF_set_underline_style = NULL;
+#else
+ tty->TF_set_underline_style = tgetstr("Smulx", address);
+#endif
+ if (!tty->TF_set_underline_style && tgetflag("Su"))
+ /* Default to the kitty escape sequence. See
+ https://sw.kovidgoyal.net/kitty/underlines/ */
+ tty->TF_set_underline_style = "\x1b[4:%p1%dm";
+
+ if (tty->TF_set_underline_style)
+ /* This escape sequence for setting the underline color is
+ consistent with the one described in kitty (see above) and
+ adapted from the one used by neovim. This sequence has
+ been altered from the neovim sequence at
+ https://github.com/neovim/neovim/blob/42f492ac99058bd1cd56c3c7871e7e464b2a5e24/src/nvim/tui/tui.c#L1932
+ to require only a single parameter, the color index. */
+ tty->TF_set_underline_color = "\x1b[58:2::%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%&%dm";
+
#else /* DOS_NT */
#ifdef WINDOWSNT
{
diff --git a/src/termchar.h b/src/termchar.h
index 5c47679a994..a9c28fff5cf 100644
--- a/src/termchar.h
+++ b/src/termchar.h
@@ -171,6 +171,13 @@ #define EMACS_TERMCHAR_H
non-blank position. Must clear before writing _. */
int TF_teleray; /* termcap xt flag: many weird consequences.
For t1061. */
+ const char *TF_set_underline_style; /* termcap Smulx entry: Switches the underline
+ style based on the parameter. Param should
+ be one of: 0 (none), 1 (straight), 2 (double),
+ 3 (wave), 4 (dotted), or 5 (dashed). */
+ const char *TF_set_underline_color; /* Enabled when TF_set_underline_style is set:
+ Sets the color of the underline. Accepts a
+ single parameter, the color index. */
int RPov; /* # chars to start a TS_repeat */
diff --git a/src/xfaces.c b/src/xfaces.c
index 37b703984be..f07bb6c8eca 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -3255,7 +3255,11 @@ DEFUN ("internal-set-lisp-face-attribute", Finternal_set_lisp_face_attribute,
}
else if (EQ (key, QCstyle)
- && !(EQ (val, Qline) || EQ (val, Qwave)))
+ && !(EQ (val, Qline)
+ || EQ (val, Qdouble)
+ || EQ (val, Qwave)
+ || EQ (val, Qdotted)
+ || EQ (val, Qdashed)))
{
valid_p = false;
break;
@@ -5204,6 +5208,7 @@ gui_supports_face_attributes_p (struct frame *f,
Lisp_Object attrs[LFACE_VECTOR_SIZE],
struct face *def_face)
{
+ Lisp_Object val;
Lisp_Object *def_attrs = def_face->lface;
Lisp_Object lattrs[LFACE_VECTOR_SIZE];
@@ -5298,6 +5303,20 @@ gui_supports_face_attributes_p (struct frame *f,
return false;
}
+ /* Check supported underline styles. */
+ val = attrs[LFACE_UNDERLINE_INDEX];
+ if (!UNSPECIFIEDP (val))
+ {
+ if (EQ (CAR_SAFE (val), QCstyle))
+ {
+ if (!(EQ (CAR_SAFE (CDR_SAFE (val)), Qline)
+ || EQ (CAR_SAFE (CDR_SAFE (val)), Qwave)))
+ {
+ return false; /* Unsupported underline style */
+ }
+ }
+ }
+
/* Everything checks out, this face is supported. */
return true;
}
@@ -5390,15 +5409,26 @@ tty_supports_face_attributes_p (struct frame *f,
val = attrs[LFACE_UNDERLINE_INDEX];
if (!UNSPECIFIEDP (val))
{
- if (STRINGP (val))
- return false; /* ttys can't use colored underlines */
- else if (EQ (CAR_SAFE (val), QCstyle) && EQ (CAR_SAFE (CDR_SAFE (val)), Qwave))
- return false; /* ttys can't use wave underlines */
- else if (face_attr_equal_p (val, def_attrs[LFACE_UNDERLINE_INDEX]))
- return false; /* same as default */
- else
- test_caps |= TTY_CAP_UNDERLINE;
- }
+ if (STRINGP (val))
+ test_caps |= TTY_CAP_UNDERLINE_STYLED;
+ else if (EQ (CAR_SAFE (val), QCstyle))
+ {
+ if (!(EQ (CAR_SAFE (CDR_SAFE (val)), Qline)
+ || EQ (CAR_SAFE (CDR_SAFE (val)), Qdouble)
+ || EQ (CAR_SAFE (CDR_SAFE (val)), Qwave)
+ || EQ (CAR_SAFE (CDR_SAFE (val)), Qdotted)
+ || EQ (CAR_SAFE (CDR_SAFE (val)), Qdashed)))
+ {
+ return false; /* Face uses an unsupported underline style. */
+ }
+
+ test_caps |= TTY_CAP_UNDERLINE_STYLED;
+ }
+ else if (face_attr_equal_p (val, def_attrs[LFACE_UNDERLINE_INDEX]))
+ return false; /* same as default */
+ else
+ test_caps |= TTY_CAP_UNDERLINE;
+ }
/* inverse video */
val = attrs[LFACE_INVERSE_INDEX];
@@ -6319,6 +6349,8 @@ realize_gui_face (struct face_cache *cache, Lisp_Object attrs[LFACE_VECTOR_SIZE]
face->underline = FACE_UNDER_LINE;
else if (EQ (value, Qwave))
face->underline = FACE_UNDER_WAVE;
+ else
+ face->underline = FACE_UNDER_LINE;
}
else if (EQ (keyword, QCposition))
{
@@ -6453,6 +6485,7 @@ realize_tty_face (struct face_cache *cache,
{
struct face *face;
int weight, slant;
+ Lisp_Object underline;
bool face_colors_defaulted = false;
struct frame *f = cache->f;
@@ -6472,13 +6505,74 @@ realize_tty_face (struct face_cache *cache,
face->tty_bold_p = true;
if (slant != 100)
face->tty_italic_p = true;
- if (!NILP (attrs[LFACE_UNDERLINE_INDEX]))
- face->tty_underline_p = true;
if (!NILP (attrs[LFACE_INVERSE_INDEX]))
face->tty_reverse_p = true;
if (!NILP (attrs[LFACE_STRIKE_THROUGH_INDEX]))
face->tty_strike_through_p = true;
+ /* Text underline. */
+ underline = attrs[LFACE_UNDERLINE_INDEX];
+ if (NILP (underline))
+ {
+ face->underline = FACE_NO_UNDERLINE;
+ face->underline_color = 0;
+ }
+ else if (EQ (underline, Qt))
+ {
+ face->underline = FACE_UNDER_LINE;
+ face->underline_color = 0;
+ }
+ else if (STRINGP (underline))
+ {
+ face->underline = FACE_UNDER_LINE;
+ face->underline_color = load_color (f, face, underline, LFACE_UNDERLINE_INDEX);
+ }
+ else if (CONSP (underline))
+ {
+ /* `(:color COLOR :style STYLE)'.
+ STYLE being one of `line', `double', `wave', `dotted' or `dashed'. */
+ face->underline = FACE_UNDER_LINE;
+ face->underline_color = 0;
+
+ while (CONSP (underline))
+ {
+ Lisp_Object keyword, value;
+
+ keyword = XCAR (underline);
+ underline = XCDR (underline);
+
+ if (!CONSP (underline))
+ break;
+ value = XCAR (underline);
+ underline = XCDR (underline);
+
+ if (EQ (keyword, QCcolor))
+ {
+ if (EQ (value, Qforeground_color))
+ face->underline_color = 0;
+ else if (STRINGP (value))
+ face->underline_color
+ = load_color (f, face, value,
+ LFACE_UNDERLINE_INDEX);
+ }
+ else if (EQ (keyword, QCstyle))
+ {
+ if (EQ (value, Qline))
+ face->underline = FACE_UNDER_LINE;
+ else if (EQ (value, Qdouble))
+ face->underline = FACE_DOUBLE_UNDER_LINE;
+ else if (EQ (value, Qwave))
+ face->underline = FACE_UNDER_WAVE;
+ else if (EQ (value, Qdotted))
+ face->underline = FACE_DOTTED_UNDER_LINE;
+ else if (EQ (value, Qdashed))
+ face->underline = FACE_DASHED_UNDER_LINE;
+ else
+ face->underline = FACE_UNDER_LINE;
+ }
+ }
+ }
+
/* Map color names to color indices. */
map_tty_color (f, face, LFACE_FOREGROUND_INDEX, &face_colors_defaulted);
map_tty_color (f, face, LFACE_BACKGROUND_INDEX, &face_colors_defaulted);
@@ -7165,6 +7259,9 @@ syms_of_xfaces (void)
DEFSYM (QCposition, ":position");
DEFSYM (Qline, "line");
DEFSYM (Qwave, "wave");
+ DEFSYM (Qdouble, "double");
+ DEFSYM (Qdotted, "dotted");
+ DEFSYM (Qdashed, "dashed");
DEFSYM (Qreleased_button, "released-button");
DEFSYM (Qpressed_button, "pressed-button");
DEFSYM (Qflat_button, "flat-button");
--
2.40.0
next prev parent reply other threads:[~2023-04-22 10:21 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-21 14:29 bug#62994: Support styled underlines on TTY frames Mohsin Kaleem
[not found] ` <handler.62994.B.168208734930664.ack@debbugs.gnu.org>
2023-04-21 14:34 ` bug#62994: [PATCH 0/3] Support styled underlines on tty Emacs frames mohkale
2023-04-21 14:34 ` bug#62994: [PATCH 1/3] Add face definitions for more underline styles mohkale
2023-04-21 15:58 ` Eli Zaretskii
2023-04-21 16:08 ` Mohsin Kaleem
2023-04-21 14:34 ` bug#62994: [PATCH 2/3] Add support for styled underlines on tty frames mohkale
2023-04-21 16:07 ` Eli Zaretskii
[not found] ` <878rel5fqr.fsf@kisara.moe>
2023-04-21 17:49 ` Eli Zaretskii
2023-04-21 18:04 ` Mohsin Kaleem
2023-04-21 18:43 ` Mohsin Kaleem
2023-04-22 7:00 ` Eli Zaretskii
2023-04-22 9:32 ` Mohsin Kaleem
2023-04-22 6:47 ` Eli Zaretskii
2023-04-22 9:57 ` Mohsin Kaleem
2023-04-21 14:34 ` bug#62994: [PATCH 3/3] Add support for colored " mohkale
2023-04-21 16:12 ` Eli Zaretskii
[not found] ` <875y9p5fg0.fsf@kisara.moe>
2023-04-21 17:56 ` Eli Zaretskii
2023-04-21 15:52 ` bug#62994: [PATCH 0/3] Support styled underlines on tty Emacs frames Eli Zaretskii
2023-04-21 16:10 ` Mohsin Kaleem
2023-04-21 19:24 ` bug#62994: [PATCH v2 0/1] " mohkale
2023-04-21 19:24 ` bug#62994: [PATCH v2 1/1] Add support for colored and styled underlines on tty frames mohkale
2023-04-24 9:21 ` Robert Pluim
2023-04-22 10:21 ` bug#62994: [PATCH v3 0/1] Support styled underlines on tty Emacs frames mohkale
2023-04-22 10:21 ` mohkale [this message]
2024-02-12 1:28 ` bug#62994: [PATCH v3 1/1] Add support for colored and styled underlines on tty frames Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-01-28 11:30 ` bug#62994: [PATCH v3 0/1] Support styled underlines on tty Emacs frames Mohsin Kaleem
2024-01-28 12:05 ` Eli Zaretskii
[not found] ` <86fryg62kh.fsf@kisara.moe>
2024-01-29 12:37 ` Eli Zaretskii
2024-02-11 17:40 ` bug#62994: [PATCH v4] Add support for colored and styled underlines on tty frames mohkale
2024-02-11 18:05 ` bug#62994: [PATCH v5] " mohkale
2024-02-11 18:07 ` Mohsin Kaleem
2024-02-12 1:43 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-02-12 13:50 ` Eli Zaretskii
2024-02-12 14:49 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-10 17:20 ` Mohsin Kaleem
2024-03-10 17:15 ` Mohsin Kaleem
2024-03-10 17:45 ` Eli Zaretskii
2024-03-10 18:22 ` Mohsin Kaleem
2024-03-10 18:51 ` Jim Porter
2024-03-10 19:28 ` Eli Zaretskii
2024-03-10 19:47 ` Jim Porter
2024-03-11 2:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-03-10 19:27 ` Eli Zaretskii
2024-02-12 12:48 ` Eli Zaretskii
2024-03-10 18:08 ` Mohsin Kaleem
2024-03-14 10:20 ` Eli Zaretskii
2024-02-14 19:40 ` Jim Porter
2024-03-10 18:10 ` Mohsin Kaleem
2024-04-14 13:56 ` bug#62994: [PATCH v6] " mohkale
2024-04-14 14:13 ` Mohsin Kaleem
2024-04-20 8:16 ` Eli Zaretskii
2024-04-21 14:51 ` Mohsin Kaleem
2024-04-21 15:57 ` Eli Zaretskii
2024-04-21 16:09 ` Mohsin Kaleem
2024-04-21 16:11 ` bug#62994: [PATCH v7] " Mohsin Kaleem
2024-04-22 0:44 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-04-22 6:01 ` Eli Zaretskii
2024-04-22 17:35 ` Jim Porter
2024-04-23 0:53 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-04-23 6:02 ` Eli Zaretskii
2024-04-23 7:32 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-04-22 17:52 ` Mohsin Kaleem
2024-04-22 17:53 ` bug#62994: [PATCH v8] " Mohsin Kaleem
2024-04-27 9:11 ` Eli Zaretskii
2024-04-29 1:04 ` Jim Porter
2024-04-29 4:52 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-04-29 7:25 ` Eli Zaretskii
2024-04-29 11:36 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-04-29 7:10 ` Eli Zaretskii
2024-04-30 17:53 ` Mohsin Kaleem
2024-04-30 18:20 ` Eli Zaretskii
2024-02-11 17:15 ` bug#62994: [PATCH v4 0/3] Support styled underlines on tty Emacs frames mohkale
2024-02-11 17:15 ` bug#62994: [PATCH v4 1/3] Add face definitions for more underline styles mohkale
2024-02-11 17:15 ` bug#62994: [PATCH v4 2/3] Add support for styled underlines on tty frames mohkale
2024-02-11 17:15 ` bug#62994: [PATCH v4 3/3] Add support for colored " mohkale
2024-02-11 17:23 ` bug#62994: [PATCH v4 0/3] Support styled underlines on tty Emacs frames Mohsin Kaleem
2024-02-11 17:46 ` Eli Zaretskii
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all data and code used by this external index.