From 14b4c8084c14ba7a6e34cafb6c9a22a330f57644 Mon Sep 17 00:00:00 2001
From: Federico Angelilli <code@fedang.net>
Date: Sat, 25 Nov 2023 12:36:10 +0100
Subject: Add cpu percentage button

---
 src/comet.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 56 insertions(+), 6 deletions(-)

(limited to 'src/comet.c')

diff --git a/src/comet.c b/src/comet.c
index a94bd54..fd393bc 100644
--- a/src/comet.c
+++ b/src/comet.c
@@ -54,6 +54,47 @@ static gboolean disk_update(gpointer data)
     return G_SOURCE_CONTINUE;
 }
 
+// Taken from slstatus
+char *cpu_percentage(void)
+{
+    static long double a[7];
+    long double b[7], sum;
+    memcpy(b, a, sizeof(b));
+
+    FILE *stat = fopen("/proc/stat", "rb");
+    /* cpu user nice system idle iowait irq softirq */
+    g_assert(7 == fscanf(stat, "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
+               &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]));
+
+    fclose(stat);
+    if (b[0] == 0) return NULL;
+
+    sum = (b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
+          (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]);
+
+    if (sum == 0) return NULL;
+
+    return g_strdup_printf("  %d%%", (int)(100 *
+                           ((b[0] + b[1] + b[2] + b[5] + b[6]) -
+                            (a[0] + a[1] + a[2] + a[5] + a[6])) / sum));
+}
+
+static gboolean cpu_update(gpointer data)
+{
+    Button *btn = data;
+
+    char *perc = cpu_percentage();
+    // Don't update on error
+    if (perc != NULL) {
+        g_free(btn->text);
+        btn->text = perc;
+        state_redraw(btn->action_data);
+    }
+
+    log_debug("Updated cpu percentage");
+    return G_SOURCE_CONTINUE;
+}
+
 static gboolean ram_update(gpointer data)
 {
     Button *btn = data;
@@ -69,6 +110,7 @@ static gboolean ram_update(gpointer data)
 		                 "Cached: %ju kB\n",
 		                 &total, &unused, &buffers, &buffers, &cached));
 
+    fclose(meminfo);
     g_free(btn->text);
     btn->text = g_strdup_printf("  %d%%", (int)(100 * (total - unused - buffers - cached) / total));
 
@@ -154,13 +196,13 @@ int main(int argc, char **argv)
         state_add_button(state, btn);
     }
 
-    Button *disk_btn = button_create("disk", PANGO_ALIGN_RIGHT);
-    button_set_colors(disk_btn, background, foreground, stroke);
-    button_set_action(disk_btn, show_action, state);
-    state_add_button(state, disk_btn);
+    Button *cpu_btn = button_create("cpu", PANGO_ALIGN_RIGHT);
+    button_set_colors(cpu_btn, background, foreground, stroke);
+    button_set_action(cpu_btn, show_action, state);
+    state_add_button(state, cpu_btn);
 
-    disk_update(disk_btn);
-    g_timeout_add(60 * 1000, disk_update, disk_btn);
+    cpu_update(cpu_btn);
+    g_timeout_add(1000, cpu_update, cpu_btn);
 
     Button *ram_btn = button_create("ram", PANGO_ALIGN_RIGHT);
     button_set_colors(ram_btn, background, foreground, stroke);
@@ -170,6 +212,14 @@ int main(int argc, char **argv)
     ram_update(ram_btn);
     g_timeout_add(60 * 1000, ram_update, ram_btn);
 
+    Button *disk_btn = button_create("disk", PANGO_ALIGN_RIGHT);
+    button_set_colors(disk_btn, background, foreground, stroke);
+    button_set_action(disk_btn, show_action, state);
+    state_add_button(state, disk_btn);
+
+    disk_update(disk_btn);
+    g_timeout_add(60 * 1000, disk_update, disk_btn);
+
     struct {
         State *state;
         timer_t timer;
-- 
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