Configure host identity in Nix

dotfiles/lib/functions/multiplexer_host_label

@@ -0,0 +1,30 @@
+#!/usr/bin/env sh
+
+multiplexer_host_label() {
+    tmux_format=0
+    if [ "$1" = "--tmux" ]; then
+        tmux_format=1
+        shift
+    fi
+
+    host=$(hostname -s 2>/dev/null || hostname 2>/dev/null || printf unknown)
+    host=${host%%.*}
+
+    identity_file=${MULTIPLEXER_HOST_IDENTITY_FILE:-/etc/multiplexer-host-identity}
+    if [ -r "$identity_file" ]; then
+        # shellcheck disable=SC1090
+        . "$identity_file"
+    fi
+
+    icon=${MULTIPLEXER_HOST_ICON:-🖥️}
+    tmux_bg=${MULTIPLEXER_HOST_TMUX_BG:-#222222}
+    tmux_fg=${MULTIPLEXER_HOST_TMUX_FG:-#ffffff}
+
+    if [ "$tmux_format" -eq 1 ]; then
+        printf '#[fg=%s,bg=%s,bold]%s %s#[default]' "$tmux_fg" "$tmux_bg" "$icon" "$host"
+    else
+        printf '%s %s' "$icon" "$host"
+    fi
+}
+
+multiplexer_host_label "$@"

dotfiles/tmux.conf

@@ -2,7 +2,9 @@
 # Prefix + C starts a new session without prompting for a name.
 bind-key C new-session -c '#{pane_current_path}' 'codex --dangerously-bypass-approvals-and-sandbox'
 
-set -g status-right '#($HOME/dotfiles/dotfiles/lib/functions/multiplexer_host_label 2>/dev/null || multiplexer_host_label 2>/dev/null || hostname -s) #{?window_bigger,[#{window_offset_x}#,#{window_offset_y}] ,}"#{=21:pane_title}" %H:%M %d-%b-%y'
+source-file -q /etc/tmux-host-style.conf
+
+set -g status-right '#($HOME/dotfiles/dotfiles/lib/functions/multiplexer_host_label --tmux 2>/dev/null || multiplexer_host_label --tmux 2>/dev/null || hostname -s) #{?window_bigger,[#{window_offset_x}#,#{window_offset_y}] ,}"#{=21:pane_title}" %H:%M %d-%b-%y'
 set -g status-right-length 150
 set -g set-titles on
 set -g set-titles-string '#{?#{==:#{session_name},#{window_name}},#{session_name},#{session_name}:#{window_name}}#{?pane_title, - #{pane_title},}'

dotfiles/tmux.powerline

@@ -1,11 +1,12 @@
 if-shell 'test -z "$POWERLINE_COMMAND"' 'if-shell "which powerline-client" "set-environment -g POWERLINE_COMMAND powerline-client" "set-environment -g POWERLINE_COMMAND powerline"'
+source-file -q /etc/tmux-host-style.conf
 set -g status on
 set -g status-utf8 on
 set -g status-interval 2
 set -g status-justify left
 set -g status-left-length 150
 set -g status-right-length 150
-set -g status-right '#(eval $POWERLINE_COMMAND tmux right -R pane_id=`tmux display -p "#D"`)'
+set -g status-right '#($HOME/dotfiles/dotfiles/lib/functions/multiplexer_host_label --tmux 2>/dev/null || multiplexer_host_label --tmux 2>/dev/null || hostname -s) #(eval $POWERLINE_COMMAND tmux right -R pane_id=`tmux display -p "#D"`)'
 set -g window-status-format "#[fg=white] #[fg=white,bg=black]#I #[fg=white] #[default]#W "
 set -g window-status-current-format "#[fg=black,bg=blue]#[fg=white,bg=blue] #I  #[fg=white,bold]#W #[fg=blue,bg=black,nobold]"
 set-window-option -g window-status-fg white

nixos/machines/adell.nix

@@ -71,6 +71,10 @@
   swapDevices = [];
 
   networking.hostName = "adell";
+  myModules.hostIdentity = {
+    emoticon = "💻";
+    tmux.background = "#7c3aed";
+  };
 
   powerManagement.cpuFreqGovernor = lib.mkDefault "performance";
 

nixos/machines/bencbox.nix

@@ -19,6 +19,10 @@
   myModules.wsl.enable = true;
 
   networking.hostName = "bencbox";
+  myModules.hostIdentity = {
+    emoticon = "📦";
+    tmux.background = "#b45309";
+  };
 
   wsl.defaultUser = "ben";
   system.stateVersion = "22.05";

nixos/machines/biskcomp.nix

@@ -162,6 +162,10 @@ in {
   ];
 
   networking.hostName = "biskcomp";
+  myModules.hostIdentity = {
+    emoticon = "🧮";
+    tmux.background = "#0f766e";
+  };
   system.stateVersion = "23.11";
 
   home-manager.sharedModules = [

nixos/machines/david-blade.nix

@@ -55,6 +55,10 @@
   ];
 
   networking.hostName = "david-blade";
+  myModules.hostIdentity = {
+    emoticon = "🗡️";
+    tmux.background = "#be123c";
+  };
 
   home-manager.sharedModules = [
     {

nixos/machines/dean-zephyrus.nix

@@ -16,6 +16,10 @@
   myModules.wsl.enable = true;
 
   networking.hostName = "dean-zephyrus";
+  myModules.hostIdentity = {
+    emoticon = "🌬️";
+    tmux.background = "#0284c7";
+  };
 
   wsl.defaultUser = "dean";
   system.stateVersion = "22.05";

nixos/machines/jay-lenovo-wsl.nix

@@ -13,6 +13,10 @@
   myModules.wsl.enable = true;
 
   networking.hostName = "jay-lenovo-wsl";
+  myModules.hostIdentity = {
+    emoticon = "💼";
+    tmux.background = "#15803d";
+  };
 
   wsl.defaultUser = "kat";
   system.stateVersion = "22.05";

nixos/machines/jay-lenovo.nix

@@ -58,6 +58,10 @@
   };
 
   networking.hostName = "jay-lenovo";
+  myModules.hostIdentity = {
+    emoticon = "💼";
+    tmux.background = "#16a34a";
+  };
 
   services.power-profiles-daemon.enable = false;
   services.tlp.enable = true;

nixos/machines/jimi-hendnix.nix

@@ -120,6 +120,11 @@
   ];
 
   networking.hostName = "jimi-hendnix";
+  myModules.hostIdentity = {
+    emoticon = "🎸";
+    tmux.background = "#ca8a04";
+    tmux.foreground = "#111111";
+  };
 
   system.stateVersion = "23.05";
 }

nixos/machines/justin-bieber-creek.nix

@@ -198,6 +198,10 @@
   swapDevices = [];
 
   networking.hostName = "justin-bieber-creek";
+  myModules.hostIdentity = {
+    emoticon = "🎤";
+    tmux.background = "#c026d3";
+  };
 
   networking.useDHCP = false;
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";

nixos/machines/nixquick.nix

@@ -32,6 +32,10 @@
   services.k3s.enable = lib.mkForce false;
 
   networking.hostName = "nixquick";
+  myModules.hostIdentity = {
+    emoticon = "🐩";
+    tmux.background = "#db2777";
+  };
 
   hardware.enableRedistributableFirmware = true;
   boot.initrd.availableKernelModules = ["xhci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod"];

nixos/machines/railbird-sf.nix

@@ -13,6 +13,10 @@
   ];
 
   networking.hostName = "railbird-sf";
+  myModules.hostIdentity = {
+    emoticon = "🐦";
+    tmux.background = "#0891b2";
+  };
 
   # Allow nginx to serve content synced into /var/lib/syncthing/* (owned by syncthing:syncthing, 2770 perms).
   users.users.nginx.extraGroups = ["syncthing"];

nixos/machines/ryzen-shine-original.nix

@@ -26,6 +26,10 @@
   boot.loader.systemd-boot.configurationLimit = 5;
 
   networking.hostName = "ryzen-shine";
+  myModules.hostIdentity = {
+    emoticon = "☀️";
+    tmux.background = "#ea580c";
+  };
 
   environment.systemPackages = with pkgs; [
     perf

nixos/machines/ryzen-shine-wsl.nix

@@ -19,6 +19,10 @@
   myModules.wsl.enable = true;
 
   networking.hostName = "ryzen-shine-wsl";
+  myModules.hostIdentity = {
+    emoticon = "☀️";
+    tmux.background = "#f97316";
+  };
 
   wsl.defaultUser = "imalison";
   system.stateVersion = "22.05";

nixos/machines/ryzen-shine.nix

@@ -47,6 +47,10 @@
   };
 
   networking.hostName = "ryzen-shine";
+  myModules.hostIdentity = {
+    emoticon = "☀️";
+    tmux.background = "#ea580c";
+  };
 
   environment.systemPackages = with pkgs; [
     perf

nixos/machines/strixi-minaj-wsl.nix

@@ -12,6 +12,10 @@
   myModules.wsl.enable = true;
 
   networking.hostName = "strixi-minaj-wsl";
+  myModules.hostIdentity = {
+    emoticon = "👩🏿";
+    tmux.background = "#4338ca";
+  };
 
   wsl.defaultUser = "imalison";
   system.stateVersion = "23.11"; # Did you read the comment?

nixos/machines/strixi-minaj.nix

@@ -103,6 +103,10 @@
   ];
 
   networking.hostName = "strixi-minaj";
+  myModules.hostIdentity = {
+    emoticon = "👩🏿";
+    tmux.background = "#4f46e5";
+  };
 
   powerManagement.cpuFreqGovernor = lib.mkDefault "performance";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault true;

nixos/options.nix

@@ -1,8 +1,50 @@
-{lib, ...}: {
+{
+  config,
+  lib,
+  ...
+}: let
+  hostIdentity = config.myModules.hostIdentity;
+in {
   options = {
+    myModules.hostIdentity = {
+      emoticon = lib.mkOption {
+        type = lib.types.str;
+        default = "🖥️";
+        description = "Short visual marker used when displaying this host in multiplexer status bars.";
+      };
+
+      tmux = {
+        background = lib.mkOption {
+          type = lib.types.str;
+          default = "#222222";
+          description = "tmux status bar background color for this host.";
+        };
+
+        foreground = lib.mkOption {
+          type = lib.types.str;
+          default = "#ffffff";
+          description = "tmux status bar foreground color for this host.";
+        };
+      };
+    };
+
     myModules.xmonad.picom.vSync.enable = lib.mkOption {
       default = true;
       type = lib.types.bool;
     };
   };
+
+  config = {
+    environment.etc."multiplexer-host-identity".text = ''
+      MULTIPLEXER_HOST_ICON=${lib.escapeShellArg hostIdentity.emoticon}
+      MULTIPLEXER_HOST_TMUX_BG=${lib.escapeShellArg hostIdentity.tmux.background}
+      MULTIPLEXER_HOST_TMUX_FG=${lib.escapeShellArg hostIdentity.tmux.foreground}
+    '';
+
+    environment.etc."tmux-host-style.conf".text = ''
+      set -g status-style "fg=${hostIdentity.tmux.foreground},bg=${hostIdentity.tmux.background}"
+      set -g status-left-style "fg=${hostIdentity.tmux.foreground},bg=${hostIdentity.tmux.background}"
+      set -g status-right-style "fg=${hostIdentity.tmux.foreground},bg=${hostIdentity.tmux.background}"
+    '';
+  };
 }