modules/i3: Allow to set a network timeout.

For the primary network interface that is going to be displayed in the
status bar, it's a good idea to have a timeout value. I'm sitting in the
train right now and it's annoying to *not* have a working status bar.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

2 files changed, 19 insertions, 2 deletions

diff --git a/modules/i3/conky.nix b/modules/i3/conky.nix
index 90116cbf..77a63ea5 100644
--- a/modules/i3/conky.nix
+++ b/modules/i3/conky.nix
@@ -1,4 +1,4 @@
-{ pkgs ? import <nixpkgs> {} }:
+{ pkgs ? import <nixpkgs> {}, timeout ? 300 }:
 
 with pkgs.lib;
 
@@ -20,7 +20,8 @@ let
     TEXT
   '';
 
-  cexpr = name: args: "\\\${${name} ${concatStringsSep " " args}}";
+  optexpr = name: expr: "\${${name}_disabled:-\\\${${name} ${expr}\\}}";
+  cexpr = name: args: "${optexpr name (concatStringsSep " " args)}";
 
   mkNetInfo = iface: let
     upspeed = cexpr "upspeed" [ iface ];
@@ -71,10 +72,17 @@ let
       echo $(cputemp_collect)
     }
 
+    tries=0
     while ! raw_netinfo="$(${
       "${pkgs.iproute}/sbin/ip route get 8.8.8.8 2> /dev/null"
     })"; do
+      if [ $tries -ge ${toString timeout} ]; then
+        upspeed_disabled=N/A
+        downspeed_disabled=N/A
+        break
+      fi
       echo "Waiting for primary network interface to become available..."
+      tries=$(($tries + 1))
       sleep 1
     done
 
diff --git a/modules/i3/default.nix b/modules/i3/default.nix
index 7e2795d9..bca88cca 100644
--- a/modules/i3/default.nix
+++ b/modules/i3/default.nix
@@ -37,6 +37,7 @@ let
 
   conky = import ./conky.nix {
     inherit pkgs;
+    timeout = config.vuizvui.i3.networkTimeout;
   };
 
   mkBar = output: statusCmd: singleton ''
@@ -90,6 +91,14 @@ in
         the left head.
       '';
     };
+
+    networkTimeout = mkOption {
+      type = types.int;
+      default = 300;
+      description = ''
+        Maximum number of seconds to wait for network device detection.
+      '';
+    };
   };
 
   config.vuizvui.i3.workspaces = defaultWorkspaces;