calculate max cpu temp no matter how many temp zones

cpu-temp.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+profile="$HOME/.nix-profile/bin/"
+system="/run/current-system/sw/bin/"
+
+sensors="$profile/sensors"
+
+max_temp=`$sensors | $system/egrep -o '[0-9][0-9]\.[0-9]' | $system/sort | $system/uniq | $system/tail -n 1`
+
+echo "${max_temp}°C"

nixos/home.nix

@@ -14,7 +14,7 @@ in
       };
     };
     home.packages = with pkgs; [
-      cabal-install stack hsetroot
+      cabal-install stack hsetroot lm_sensors
       wirelesstools ranger xpdf apvlv unstable.xidlehook blueman
       fontconfig nodejs rustup gcc gdb
       binutils xclip pkgconfig veracrypt gitAndTools.diff-so-fancy

nixos/polybar.nix

@@ -56,10 +56,9 @@
       };
 
       "module/temperature" = {
-        type = "internal/temperature";
-        thermal-zone = 3;
+        type = "custom/script";
         interval = 5;
-        format = "TEMP: <label>";
+        exec = "~/dev/dotfiles/cpu-temp.sh";
       };
 
       "module/memory" = {