feat(build): use meson so I don't end up ripping my hair out

src/main.c

@@ -0,0 +1,159 @@
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <sys/poll.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+#include "log.h"
+#include "led.h"
+#include "acpi.h"
+#include "utils.h"
+
+#include "config.h"
+
+#define MAX_BUFLEN 1024
+
+char
+*battery_percent(void)
+{
+  char *r, c, *d;
+  int i;
+  FILE *f;
+
+  /* open up the battery capacity for reading */
+  d = concat(battery_dir, "/capacity");
+  f = fopen(d, "r");
+  free(d);
+
+  /* create enough space for the battery percentage */
+  r = calloc(4, sizeof(char));
+
+  /* read in the battery percentage */
+  i = 0;
+  while ((c = getc(f)) && i < 4) {
+    /* make sure to replace the newline with a string terminator */
+    if (c == '\n') {
+      r[i] = '\0';
+      break;
+    }
+    r[i] = c;
+    i++;
+  }
+
+  fclose(f);
+  return r;
+}
+
+bool
+plugged_in(char *fn)
+{
+  FILE *f;
+  char buf[1];
+
+  f = fopen(fn, "r");
+  if (read(fileno(f), buf, 1) < 0) {
+    return -1;
+  }
+  fclose(f);
+
+  return buf[0] - '0';
+}
+
+void
+on_battery_event(char *percent, bool plugged)
+{
+  char *ep;
+  int res;
+  double rate;
+
+  if (!plugged) {
+    /* convert battery percentage to an int */
+    res = strtol(percent, &ep, 10);
+
+    if (res <= blink_start) {
+      rate = blink_formula(res);
+      if (rate >= 1) {
+        led_set_rate(rate);
+      }
+    } else {
+      led_set_rate(0);
+    }
+  } else {
+    led_set_rate(0);
+  }
+
+  free(percent);
+}
+
+int
+main(int argc, char *argv[])
+{
+  bool plugged = plugged_in((char *)linefile);
+  char buffer[MAX_BUFLEN], *out[4];
+  int sock_fd;
+
+  /* set the logging level */
+  log_set_level(LOG_DEBUG);
+
+  /* open up socket address */
+  sock_fd = acpi_create_socket((char *)acpid_sock);
+
+  /* create the led thread */
+  led_create_thread((char *)ledfile);
+
+  /* run events that need to be run on start to ensure that the current state
+   * inside the program reflects that that is outside the program
+   */
+  on_battery_event(battery_percent(), plugged);
+
+  /* zero buffer */
+  memset(out, 0, sizeof(out));
+
+  for (;;) {
+    /* read input */
+    memset(buffer, 0, MAX_BUFLEN);
+    if (read(sock_fd, buffer, MAX_BUFLEN) < 0) {
+      log_fatal("read: %s", strerror(errno));
+      return 1;
+    }
+
+    /* parse */
+    if (acpi_parse(buffer, out) != 0) {
+      continue;
+    }
+
+    /* rules */
+    if (strcmp(out[0], "ac_adapter") == 0) {
+      char *s = get_substring(out[1], 0, 2);
+
+      if (strcmp(s, "AC") == 0) {
+        plugged = plugged_in("/sys/class/power_supply/ACAD/online");
+      }
+
+      free(s);
+    } else if (strcmp(out[0], "battery") == 0) {
+      char *s = get_substring(out[1], 0, 3);
+
+      if (strcmp(s, "PNP") == 0) {
+        if (strcmp(out[2], "00000080") == 0) {
+          if (strcmp(out[3], "00000001") == 0) {
+            on_battery_event(battery_percent(), plugged);
+          }
+        }
+      }
+      free(s);
+    }
+
+    acpi_clean_parse(out);
+  }
+
+  acpi_close_socket(sock_fd);
+}