add_field.diff

diff --git a/statusd.cpp b/statusd.cpp
index 050c5aa..471ae8d 100644
--- a/statusd.cpp
+++ b/statusd.cpp
@@ -22,18 +22,20 @@ enum FieldIndex : u8 {
     FI_TIME = 0,
     FI_LOAD,
     FI_TEMP,
+    FI_MEM,
     N_FIELDS,
 };
 
 /* Macros */
 #define SOCK_NAME "status-sock"
-#define STATUS_FMT "[%s |%s |%s]"
+#define STATUS_FMT "[%s |%s |%s |%s]"
 #define FIELD_BUF_MAX_SIZE (31 + 1)
 #define STATUS_BUF_MAX_SIZE (FIELD_BUF_MAX_SIZE * N_FIELDS + sizeof(STATUS_FMT) + 1)
 #define SHELL "/bin/sh"
 #define TIME_CMD R"(date +%T)"
 #define LOAD_CMD R"(uptime | awk '{print $(NF-2)}' | sed 's/,//g')"
 #define TEMP_CMD R"(sensors | grep -F "Core 0" | awk '{print $3}' | sed 's/+//')"
+#define MEM_CMD R"(free -h | awk '/^Mem:/ {print $3"/"$2}')"
 #define SHCMD(cmd)                                                                            \
     {                                                                                         \
         SHELL, "-c", cmd, nullptr                                                             \
@@ -55,6 +57,7 @@ static bool read_cmd_output(const char*, char*, size_t);
 static void update_time();
 static void update_load();
 static void update_temp();
+static void update_mem();
 static void init_status();
 #ifndef NO_X11
 static bool init_x();
@@ -65,6 +68,7 @@ static constexpr void (*updates[])() = {
     &update_time, /* 0 */
     &update_load, /* 1 */
     &update_temp, /* 2 */
+    &update_mem,  /* 3 */
 };
 
 /* Function definitions  */
@@ -77,7 +81,8 @@ refresh_status()
              STATUS_FMT,
              field_buffers[0],
              field_buffers[1],
-             field_buffers[2]);
+             field_buffers[2],
+             field_buffers[3]);
 
 #ifdef NO_X11
     puts(buf);
@@ -204,6 +209,12 @@ update_temp()
     read_cmd_output(TEMP_CMD, field_buffers[FI_TEMP], FIELD_BUF_MAX_SIZE);
 }
 
+void
+update_mem()
+{
+    read_cmd_output(MEM_CMD, field_buffers[FI_MEM], FIELD_BUF_MAX_SIZE);
+}
+
 void
 init_status()
 {