feat(network): Add mac address token (#2569)

* Add mac address option

* Add error handling

* Address changes

* Move outside of for loop

* Update changelog

CHANGELOG.md

@@ -73,6 +73,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `DEBUG_SHADED` cmake variable and its associated functionality.
 
 ### Added
+- `internal/network`: New token `%mac%`
+   ([2569](https://github.com/polybar/polybar/pull/2569))
 - Polybar can now read config files from stdin: `polybar -c /dev/stdin`.
 - `custom/script`: Implement `env-*` config option.
    ([2090](https://github.com/polybar/polybar/issues/2090))

include/adapters/net.hpp

@@ -68,6 +68,7 @@ namespace net {
   struct link_status {
     string ip;
     string ip6;
+    string mac;
     link_activity previous{};
     link_activity current{};
   };
@@ -86,6 +87,7 @@ namespace net {
 
     string ip() const;
     string ip6() const;
+    string mac() const;
     string downspeed(int minwidth = 3, const string& unit = "B/s") const;
     string upspeed(int minwidth = 3, const string& unit = "B/s") const;
     void set_unknown_up(bool unknown = true);

src/adapters/net.cpp

@@ -31,6 +31,7 @@ namespace net {
   };
 
   static const string NO_IP = string("N/A");
+  static const string NO_MAC = string("N/A");
   static const string NET_PATH = "/sys/class/net/";
   static const string VIRTUAL_PATH = "/sys/devices/virtual/";
 
@@ -150,6 +151,11 @@ namespace net {
       return false;
     }
 
+    m_status.mac = string_util::trim(file_util::contents(NET_PATH + m_interface + "/address"), isspace);
+    if (m_status.mac == "") {
+      m_status.mac = NO_MAC;
+    }
+
     for (auto ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) {
       if (ifa->ifa_addr == nullptr) {
         continue;
@@ -228,6 +234,12 @@ namespace net {
   string network::ip() const {
     return m_status.ip;
   }
+  /**
+   * Get interface mac address
+   */
+  string network::mac() const {
+    return m_status.mac;
+  }
 
   /**
    * Get interface ipv6 address

src/modules/network.cpp

@@ -154,6 +154,7 @@ namespace modules {
       label->reset_tokens();
       label->replace_token("%ifname%", m_interface);
       label->replace_token("%local_ip%", network->ip());
+      label->replace_token("%mac%", network->mac());
       label->replace_token("%local_ip6%", network->ip6());
       label->replace_token("%upspeed%", upspeed);
       label->replace_token("%downspeed%", downspeed);