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	tadd timer(1) - stopwatch - simple timer for console or x root window
	git clone git://src.adamsgaard.dk/stopwatch
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	---
	commit 056f2e50e7795c50e3fd616034a39731ebc49d30
	parent 4f6e38d9d743040a27ac5fdc0f49dbe5d53ec2af
	Author: Anders Damsgaard <[email protected]>
	Date: Thu, 5 Nov 2020 09:03:59 +0100

	add timer(1)

	Diffstat:
	M Makefile \| 7 +++----
	M stopwatch.1 \| 1 +
	A timer.1 \| 48 +++++++++++++++++++++++++++++…
	A timer.c \| 101 +++++++++++++++++++++++++++++…

	4 files changed, 153 insertions(+), 4 deletions(-)
	---
	diff --git a/Makefile b/Makefile
	t@@ -10,10 +10,9 @@ DOCPREFIX = ${PREFIX}/share/doc/${NAME}

	RANLIB = ranlib

	-BIN = ${NAME}
	-#BIN = \
	-# stopwatch\
	-# timer
	+BIN = \
	+ stopwatch\
	+ timer
	SRC = ${BIN:=.c}
	HDR = timeutil.h

	diff --git a/stopwatch.1 b/stopwatch.1
	t@@ -40,6 +40,7 @@ exits with 0 on success, and >0 if a a runtime error occurs.
	.Sh SEE ALSO
	.Xr dwm 1
	.Xr spoon 1
	+.Xr timer 1
	.Xr xsetroot 1
	.Sh AUTHORS
	.An Anders Damsgaard Aq Mt [email protected]
	diff --git a/timer.1 b/timer.1
	t@@ -0,0 +1,48 @@
	+.Dd $Mdocdate$
	+.Dt TIMER 1
	+.Os
	+.Sh NAME
	+.Nm timer
	+.Nd reports elapsed time after launch.
	+.Sh SYNOPSIS
	+.Nm
	+.Op Fl p Ar prefix
	+.Op Fl P Ar postfix
	+.Op Fl i Ar interval
	+.Op Fl x
	+.Ar HH:MM:SS
	+.Sh DESCRIPTION
	+The
	+.Nm
	+counts down from for the specified duration in HH:MM:SS format, and
	+prints the remaining time to standard output by default. The time
	+is written in the format "%S s" for remaining time of less than one
	+minute long, "%M:%SS" for durations less than one hour, and
	+"%H:%MM:%SS" for all longer durations.
	+.Pp
	+The options are as follows:
	+.Bl -tag -width Ds
	+.It Fl p Ar prefix
	+Print the
	+.Ar prefix
	+string before the time stamp.
	+.It Fl P Ar postfix
	+Print the
	+.Ar postfix
	+string after the time stamp.
	+.It Fl i Ar interval
	+update the elapsed time with this interval in seconds.
	+.It Fl x
	+write the output to the X root window parameter, which
	+.Xr dwm 1
	+uses as status line.
	+.Sh EXIT STATUS
	+.Nm
	+exits with 0 on success, and >0 if a a runtime error occurs.
	+.Sh SEE ALSO
	+.Xr dwm 1
	+.Xr spoon 1
	+.Xr stopwatch 1
	+.Xr xsetroot 1
	+.Sh AUTHORS
	+.An Anders Damsgaard Aq Mt [email protected]
	diff --git a/timer.c b/timer.c
	t@@ -0,0 +1,101 @@
	+#include <stdio.h>
	+#include <stdlib.h>
	+#include <limits.h>
	+#include <unistd.h>
	+#include <time.h>
	+#include <string.h>
	+#include <err.h>
	+#include <X11/Xlib.h>
	+
	+#include "timeutil.h"
	+
	+char *argv0;
	+
	+void
	+usage(void)
	+{
	+ errx(1, "usage: %s [-p prefix] [-P postfix] [-i interval] [-x] HH:MM:S…
	+}
	+
	+void
	+print_loop(unsigned int interval, char prefix, char postfix, time_t duration)
	+{
	+ char buf[LINE_MAX];
	+ time_t t_start = time(NULL);
	+ time_t t_elapsed = 0;
	+
	+ while ((t_elapsed = time(NULL) - t_start) < duration) {
	+ format_time(buf, sizeof(buf), duration - t_elapsed, prefix, po…
	+ printf("\r%s ", buf);
	+ fflush(stdout);
	+ sleep(interval);
	+ }
	+}
	+
	+void
	+xroot_loop(unsigned int interval, char prefix, char postfix, time_t duration)
	+{
	+ Display *dpy;
	+ char buf[LINE_MAX];
	+ time_t t_start = time(NULL);
	+ time_t t_elapsed = 0;
	+
	+ dpy = XOpenDisplay(NULL);
	+ if (dpy == NULL)
	+ errx(1, "cannot open display");
	+ while ((t_elapsed = time(NULL) - t_start) < duration) {
	+ format_time(buf, sizeof(buf), duration - t_elapsed, prefix, po…
	+ XStoreName(dpy, DefaultRootWindow(dpy), buf);
	+ XSync(dpy, False);
	+ sleep(interval);
	+ }
	+}
	+
	+int
	+main(int argc, char *argv[])
	+{
	+ int h, m, s;
	+ time_t duration;
	+ int ch, xflag = 0;
	+ unsigned int interval = 1;
	+ char prefix[LINE_MAX] = "", postfix[LINE_MAX] = "";
	+ const char *errstr;
	+
	+ argv0 = *argv;
	+
	+ while ((ch = getopt(argc, argv, "p:P:i:x")) != -1) {
	+ switch (ch) {
	+ case 'p':
	+ strlcpy(prefix, optarg, sizeof(prefix));
	+ break;
	+ case 'P':
	+ strlcpy(postfix, optarg, sizeof(postfix));
	+ break;
	+ case 'i':
	+ interval = strtonum(optarg, 1, UINT_MAX, &errstr);
	+ if (errstr != NULL)
	+ errx(1, "interval is %s: %s", errstr, optarg);
	+ break;
	+ case 'x':
	+ xflag = 1;
	+ break;
	+ default:
	+ usage();
	+ }
	+ }
	+ argc -= optind;
	+ argv += optind;
	+ if (argc != 1)
	+ usage();
	+
	+ if (sscanf(argv[0], "%d:%d:%d", &h, &m, &s) != 3)
	+ errx(2, "could not parse time in HH:MM:SS format");
	+ duration = h * 3600 + m * 60 + s;
	+
	+ if (xflag)
	+ xroot_loop(interval, prefix, postfix, duration);
	+ else
	+ print_loop(interval, prefix, postfix, duration);
	+
	+ return 0;
	+}