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Display CPU usage as a bar graph using Unicode characters #506

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Display CPU usage as a bar graph using Unicode characters #506

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6 changes: 5 additions & 1 deletion man/i3status.man
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Original file line number Diff line number Diff line change
Expand Up @@ -453,9 +453,13 @@ when above degraded threshold can be customized with
For displaying the Nth CPU usage, you can use the %cpu<N> format string,
starting from %cpu0. This feature is currently not supported in FreeBSD.

CPU usage can also be represented graphically using %usagebar and %cpubar<N>
instead of, respectively, %usage and %cpu<N>. This feature requires the use
of a (preferrably, monospace) font implementing "Block Elements"

*Example order*: +cpu_usage+

*Example format*: +all: %usage CPU_0: %cpu0 CPU_1: %cpu1+
*Example format*: +all: %usage [%cpubar0%cpubar1]+

*Example max_threshold*: +75+

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28 changes: 24 additions & 4 deletions src/print_cpu_usage.c
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Expand Up @@ -64,6 +64,8 @@ static struct cpu_usage prev_all = {0, 0, 0, 0, 0};
static struct cpu_usage *prev_cpus = NULL;
static struct cpu_usage *curr_cpus = NULL;

static const char *bars[] = {" ", "▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"};

/*
* Reads the CPU utilization from /proc/stat and returns the usage as a
* percentage.
Expand Down Expand Up @@ -201,14 +203,27 @@ void print_cpu_usage(cpu_usage_ctx_t *ctx) {
*(outwalk++) = *walk;

} else if (BEGINS_WITH(walk + 1, "usage")) {
outwalk += sprintf(outwalk, "%02d%s", diff_usage, pct_mark);
walk += strlen("usage");
if (BEGINS_WITH(walk + 1, "usagebar")) {
if (diff_usage > 98)
diff_usage = 98;
outwalk += sprintf(outwalk, "%s", bars[diff_usage / 11]);
walk += strlen("usagebar");
} else {
outwalk += sprintf(outwalk, "%02d%s", diff_usage, pct_mark);
walk += strlen("usage");
}
}
#if defined(__linux__)
else if (BEGINS_WITH(walk + 1, "cpu")) {
bool bar = false;
if (BEGINS_WITH(walk + 1, "cpubar"))
bar = true;
int number = -1;
int length = strlen("cpu");
sscanf(walk + 1, "cpu%d%n", &number, &length);
if (bar)
sscanf(walk + 1, "cpubar%d%n", &number, &length);
else
sscanf(walk + 1, "cpu%d%n", &number, &length);
if (number == -1) {
fprintf(stderr, "i3status: provided CPU number cannot be parsed\n");
} else if (number >= cpu_count) {
Expand All @@ -217,7 +232,12 @@ void print_cpu_usage(cpu_usage_ctx_t *ctx) {
int cpu_diff_idle = curr_cpus[number].idle - prev_cpus[number].idle;
int cpu_diff_total = curr_cpus[number].total - prev_cpus[number].total;
int cpu_diff_usage = (cpu_diff_total ? (1000 * (cpu_diff_total - cpu_diff_idle) / cpu_diff_total + 5) / 10 : 0);
outwalk += sprintf(outwalk, "%02d%s", cpu_diff_usage, pct_mark);
if (bar) {
if (cpu_diff_usage > 98)
cpu_diff_usage = 98;
outwalk += sprintf(outwalk, "%s", bars[cpu_diff_usage / 11]);
} else
outwalk += sprintf(outwalk, "%02d%s", cpu_diff_usage, pct_mark);
}
walk += length;
}
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