[wiki] [sites] [slock][patch] patch that allows full color messages || Guy Shefy

From: <git_AT_suckless.org>
Date: Wed, 10 Feb 2021 00:36:36 +0100

commit 6a58ac2eaa8ec0cf6eaeccd045de40f70e722e2e
Author: Guy Shefy <guyshefyb_AT_gmail.com>
Date: Wed Feb 10 01:33:27 2021 +0200

    [slock][patch] patch that allows full color messages
    
    `colormessage` is a derivative of `message`. The
    difference is that it allows 24 bit color messages
    using ANSI escape codes.

diff --git a/tools.suckless.org/slock/patches/colormessage/index.md b/tools.suckless.org/slock/patches/colormessage/index.md
new file mode 100644
index 00000000..30781c9a
--- /dev/null
+++ b/tools.suckless.org/slock/patches/colormessage/index.md
_AT_@ -0,0 +1,40 @@
+Color Message
+=============
+
+Description
+-----------
+Based on the message patch, This patch lets you add a message to your lock screen, using 24 bit color ANSI escape codes.
+
+Exactly like in the original patch, You can place a default message in `config.h`, and you can also pass a message with `-m message`
+
+For example, you can run
+
+ slock -m "$(printf "text colored \x1b[38;2;0;255;0m green\x1b[39m
")"
+
+to color a single word
+
+Or, you can go all in and run
+
+ slock -m "$(cowsay "$(fortune)" | lolcat -ft)"
+
+Notes
+-----
+This adds three items to `config.h`:
+
+* `message` - the default message
+* `text_color` - the color used when no color codes are in effect. can be a hex color or a colorname
+* `font_name` - which must be some valid X11 font name like "6x10".
+
+*A list of font names can be generated with* `slock -f`
+
+*When using lolcat you should add the -ft options*
+
+Download
+--------
+* [slock-colormessage-20200210-35633d4.diff](slock-colormessage-20200210-35633d4.diff)
+
+
+Authors
+-------
+* Guy Shefy - guyshefyb_AT_gmail.com
+* Based on patch by Blair Drummond - blair.robert.drummond_AT_gmail.com
diff --git a/tools.suckless.org/slock/patches/colormessage/slock-colormessage-20200210-35633d4.diff b/tools.suckless.org/slock/patches/colormessage/slock-colormessage-20200210-35633d4.diff
new file mode 100644
index 00000000..0ef08474
--- /dev/null
+++ b/tools.suckless.org/slock/patches/colormessage/slock-colormessage-20200210-35633d4.diff
_AT_@ -0,0 +1,284 @@
+From 53ba5a8d3608ca9c9c406b12c51c2bfdfb3e01d3 Mon Sep 17 00:00:00 2001
+From: Guy Shefy <guyshefyb_AT_gmail.com>
+Date: Wed, 10 Feb 2021 00:17:46 +0200
+Subject: [PATCH] Add a message command with 24 bit color support
+
+---
+ config.def.h | 9 +++
+ config.mk | 2 +-
+ slock.1 | 7 +++
+ slock.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++--
+ 4 files changed, 167 insertions(+), 5 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 9855e21..c2a0ab2 100644
+--- a/config.def.h
++++ b/config.def.h
+_AT_@ -10,3 +10,12 @@ static const char *colorname[NUMCOLS] = {
+
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
++
++/* default message */
++static const char * message = "Suckless: Software that sucks less.";
++
++/* text color */
++static const char * text_color = "#ffffff";
++
++/* text size (must be a valid size) */
++static const char * font_name = "6x10";
+diff --git a/config.mk b/config.mk
+index 74429ae..c4ccf66 100644
+--- a/config.mk
++++ b/config.mk
+_AT_@ -12,7 +12,7 @@ X11LIB = /usr/X11R6/lib
+
+ # includes and libs
+ INCS = -I. -I/usr/include -I${X11INC}
+-LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr
++LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext -lXrandr -lXinerama
+
+ # flags
+ CPPFLAGS = -DVERSION=\"${VERSION}\" -D_DEFAULT_SOURCE -DHAVE_SHADOW_H
+diff --git a/slock.1 b/slock.1
+index 82cdcd6..946165f 100644
+--- a/slock.1
++++ b/slock.1
+_AT_@ -6,6 +6,8 @@
+ .Sh SYNOPSIS
+ .Nm
+ .Op Fl v
++.Op Fl f
++.Op Fl m Ar message
+ .Op Ar cmd Op Ar arg ...
+ .Sh DESCRIPTION
+ .Nm
+_AT_@ -16,6 +18,11 @@ is executed after the screen has been locked.
+ .Bl -tag -width Ds
+ .It Fl v
+ Print version information to stdout and exit.
++.It Fl f
++List all valid X fonts and exit.
++.It Fl m Ar message
++Overrides default slock lock message.
++.TP
+ .El
+ .Sh SECURITY CONSIDERATIONS
+ To make sure a locked screen can not be bypassed by switching VTs
+diff --git a/slock.c b/slock.c
+index 5ae738c..b8b7fe4 100644
+--- a/slock.c
++++ b/slock.c
+_AT_@ -15,6 +15,7 @@
+ #include <unistd.h>
+ #include <sys/types.h>
+ #include <X11/extensions/Xrandr.h>
++#include <X11/extensions/Xinerama.h>
+ #include <X11/keysym.h>
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
+_AT_@ -24,6 +25,9 @@
+
+ char *argv0;
+
++/* global count to prevent repeated error messages */
++int count_error = 0;
++
+ enum {
+ INIT,
+ INPUT,
+_AT_@ -83,6 +87,132 @@ dontkillme(void)
+ }
+ #endif
+
++static int
++readescapedint(const char *str, int *i) {
++ int n = 0;
++ if (str[*i])
++ ++*i;
++ while(str[*i] && str[*i] != ';' && str[*i] != 'm') {
++ n = 10 * n + str[*i] - '0';
++ ++*i;
++ }
++ return n;
++}
++
++static void
++writemessage(Display *dpy, Window win, int screen)
++{
++ int len, line_len, width, height, s_width, s_height, i, k, tab_size, r, g, b, escaped_int, curr_line_len;
++ XGCValues gr_values;
++ XFontStruct *fontinfo;
++ XColor color, dummy;
++ XineramaScreenInfo *xsi;
++ GC gc;
++ fontinfo = XLoadQueryFont(dpy, font_name);
++
++ if (fontinfo == NULL) {
++ if (count_error == 0) {
++ fprintf(stderr, "slock: Unable to load font \"%s\"
", font_name);
++ fprintf(stderr, "slock: Try listing fonts with 'slock -f'
");
++ count_error++;
++ }
++ return;
++ }
++
++ tab_size = 8 * XTextWidth(fontinfo, " ", 1);
++
++ XAllocNamedColor(dpy, DefaultColormap(dpy, screen),
++ text_color, &color, &dummy);
++
++ gr_values.font = fontinfo->fid;
++ gr_values.foreground = color.pixel;
++ gc=XCreateGC(dpy,win,GCFont+GCForeground, &gr_values);
++
++ /* To prevent "Uninitialized" warnings. */
++ xsi = NULL;
++
++ /*
++ * Start formatting and drawing text
++ */
++
++ len = strlen(message);
++
++ /* Max max line length (cut at '
') */
++ line_len = curr_line_len = 0;
++ k = 0;
++ for (i = 0; i < len; i++) {
++ if (message[i] == '
') {
++ curr_line_len = 0;
++ k++;
++ } else if (message[i] == 0x1b) {
++ while (i < len && message[i] != 'm') {
++ i++;
++ }
++ if (i == len)
++ die("slock: unclosed escape sequence
");
++ } else {
++ curr_line_len += XTextWidth(fontinfo, message + i, 1);
++ if (curr_line_len > line_len)
++ line_len = curr_line_len;
++ }
++ }
++ /* If there is only one line */
++ if (line_len == 0)
++ line_len = len;
++
++ if (XineramaIsActive(dpy)) {
++ xsi = XineramaQueryScreens(dpy, &i);
++ s_width = xsi[0].width;
++ s_height = xsi[0].height;
++ } else {
++ s_width = DisplayWidth(dpy, screen);
++ s_height = DisplayHeight(dpy, screen);
++ }
++ height = s_height*3/7 - (k*20)/3;
++ width = (s_width - line_len)/2;
++
++ line_len = 0;
++ /* print the text while parsing 24 bit color ANSI escape codes*/
++ for (i = k = 0; i < len; i++) {
++ switch (message[i]) {
++ case '
':
++ line_len = 0;
++ while (message[i + 1] == ' ') {
++ line_len += tab_size;
++ i++;
++ }
++ k++;
++ break;
++ case 0x1b:
++ i++;
++ if (message[i] == '[') {
++ escaped_int = readescapedint(message, &i);
++ if (escaped_int == 39)
++ continue;
++ if (escaped_int != 38)
++ die("slock: unknown escape sequence%d
", escaped_int);
++ if (readescapedint(message, &i) != 2)
++ die("slock: only 24 bit color supported
");
++ r = readescapedint(message, &i) & 0xff;
++ g = readescapedint(message, &i) & 0xff;
++ b = readescapedint(message, &i) & 0xff;
++ XSetForeground(dpy, gc, r << 16 | g << 8 | b);
++ } else
++ die("slock: unknown escape sequence
");
++ break;
++ default:
++ XDrawString(dpy, win, gc, width + line_len, height + 20 * k, message + i, 1);
++ line_len += XTextWidth(fontinfo, message + i, 1);
++ }
++ }
++
++ /* xsi should not be NULL anyway if Xinerama is active, but to be safe */
++ if (XineramaIsActive(dpy) && xsi != NULL)
++ XFree(xsi);
++}
++
++
++
+ static const char *
+ gethash(void)
+ {
+_AT_@ -194,6 +324,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
+ locks[screen]->win,
+ locks[screen]->colors[color]);
+ XClearWindow(dpy, locks[screen]->win);
++ writemessage(dpy, locks[screen]->win, screen);
+ }
+ oldc = color;
+ }
+_AT_@ -300,7 +431,7 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ static void
+ usage(void)
+ {
+- die("usage: slock [-v] [cmd [arg ...]]
");
++ die("usage: slock [-v] [-f] [-m message] [cmd [arg ...]]
");
+ }
+
+ int
+_AT_@ -313,12 +444,25 @@ main(int argc, char **argv) {
+ gid_t dgid;
+ const char *hash;
+ Display *dpy;
+- int s, nlocks, nscreens;
++ int i, s, nlocks, nscreens;
++ int count_fonts;
++ char **font_names;
+
+ ARGBEGIN {
+ case 'v':
+ fprintf(stderr, "slock-"VERSION"
");
+ return 0;
++ case 'm':
++ message = EARGF(usage());
++ break;
++ case 'f':
++ if (!(dpy = XOpenDisplay(NULL)))
++ die("slock: cannot open display
");
++ font_names = XListFonts(dpy, "*", 10000 /* list 10000 fonts*/, &count_fonts);
++ for (i=0; i<count_fonts; i++) {
++ fprintf(stderr, "%s
", *(font_names+i));
++ }
++ return 0;
+ default:
+ usage();
+ } ARGEND
+_AT_@ -363,10 +507,12 @@ main(int argc, char **argv) {
+ if (!(locks = calloc(nscreens, sizeof(struct lock *))))
+ die("slock: out of memory
");
+ for (nlocks = 0, s = 0; s < nscreens; s++) {
+- if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
++ if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL) {
++ writemessage(dpy, locks[s]->win, s);
+ nlocks++;
+- else
++ } else {
+ break;
++ }
+ }
+ XSync(dpy, 0);
+
+--
+2.30.0
+
Received on Wed Feb 10 2021 - 00:36:36 CET