dwm: Add bar script

specializations/dwm.nix

@@ -10,6 +10,8 @@ let
     ;
 
   osu-backgrounds = pkgs.callPackage ../packages/osu-backgrounds.nix { };
+
+  barScript = "dwm/bar.fish";
 in
 {
   home-manager.sharedModules = singleton {
@@ -37,14 +39,8 @@ in
             xrdb -merge ~/.Xresources
             xset r rate 300 50
             feh --bg-fill "$(fish -c 'random choice (fd . ${osu-backgrounds}/2024-07-15-Aerial-Antics-Art-Contest-All-Entries --follow -e jpg -e png)')" &
-
+            ~/.config/${barScript} &
-            while true; do
-              xsetroot -name "$(date +"%F %R")"
-              sleep 1m
-            done &
-
             picom --daemon
-
             fcitx5 &
 
             while true; do
@@ -54,6 +50,46 @@ in
       };
     };
 
+    xdg.configFile = {
+      ${barScript} = {
+        executable = true;
+        text = # fish
+        ''
+          #!/usr/bin/env fish
+
+          function get_icon
+            if test "$argv" -gt 90
+              echo " "
+            else if test "$argv" -gt 60
+              echo " "
+            else if test "$argv" -gt 30
+              echo " "
+            else if test "$argv" -gt 10
+              echo " "
+            else
+              echo " "
+            end
+          end
+
+          function update_bar
+            set VOLUME "音量：$(math "$(wpctl get-volume @DEFAULT_AUDIO_SINK@ | choose 1) * 100")%"
+            set TIME "$(date '+%x（%a）%R')"
+            set capacity "$(cat /sys/class/power_supply/BAT0/capacity)"
+
+            set BATTERY "$(get_icon $capacity)$capacity%"
+
+            xsetroot -name "$VOLUME・$BATTERY・$TIME"
+          end
+
+          while true
+            update_bar
+
+            sleep 10s
+          end
+        '';
+      };
+    };
+
     services = {
       picom = rec {
         enable = true;