module: network: monitor ethernet interfaces

State exposed (tag names):

* name: the interface name ("eth0" etc)
* index: the interface index, "ifindex"
* state: operational state (down, up etc)
* mac: the Ethernet hardware address
* ipv4: the *last* IPv4 address added to the interface
* ipv6: the *last* IPv6 address added to the interface

State we monitor (for changes):

* state
* ipv4 addresses
* ipv6 addresses

config.c

@@ -27,6 +27,7 @@
 #include "modules/i3.h"
 #include "modules/label.h"
 #include "modules/mpd.h"
+#include "modules/network.h"
 #include "modules/xkb.h"
 #include "modules/xwindow.h"
 
@@ -505,6 +506,19 @@ module_mpd_from_config(const struct yml_node *node,
         particle_from_config(c, parent_font));
 }
 
+static struct module *
+module_network_from_config(const struct yml_node *node,
+                           const struct font *parent_font)
+{
+    const struct yml_node *name = yml_get_value(node, "name");
+    const struct yml_node *content = yml_get_value(node, "content");
+
+    assert(yml_is_scalar(name));
+
+    return module_network(
+        yml_value_as_string(name), particle_from_config(content, parent_font));
+}
+
 struct bar *
 conf_to_bar(const struct yml_node *bar)
 {
@@ -615,6 +629,8 @@ conf_to_bar(const struct yml_node *bar)
                     mods[idx] = module_backlight_from_config(it.node, font);
                 else if (strcmp(mod_name, "mpd") == 0)
                     mods[idx] = module_mpd_from_config(it.node, font);
+                else if (strcmp(mod_name, "network") == 0)
+                    mods[idx] = module_network_from_config(it.node, font);
                 else
                     assert(false);
             }