WIP: xterm.js

I'm about to add a similar helper for `terminal-overrides`, hence making
`mkTerminalFlags` the helper and `mkTerminalFeatures` the new function.

hosts/homes/ambroisie@bazin/default.nix

@@ -29,6 +29,8 @@
       terminalFeatures = {
         # HTerm uses `xterm-256color` as its `$TERM`, so use that here
         xterm-256color = { };
+        # Terminal app uses `xterm.js`, not HTerm
+        "xterm.js" = { };
       };
     };
 

hosts/homes/ambroisie@mousqueton/default.nix

@@ -35,6 +35,8 @@
       terminalFeatures = {
         # HTerm uses `xterm-256color` as its `$TERM`, so use that here
         xterm-256color = { };
+        # Terminal app uses `xterm.js`, not HTerm
+        "xterm.js" = { };
       };
     };
   };

modules/home/tmux/default.nix

@@ -6,13 +6,16 @@ let
     (config.my.home.wm.windowManager != null)
   ];
 
-  mkTerminalFeature = opt: flag:
+  mkTerminalFlag = tmuxVar: opt: flag:
     let
-      mkFlag = term: ''set -as terminal-features ",${term}:${flag}"'';
+      mkFlag = term: ''set -as ${tmuxVar} ",${term}:${flag}"'';
       enabledTerminals = lib.filterAttrs (_: v: v.${opt}) cfg.terminalFeatures;
       terminals = lib.attrNames enabledTerminals;
     in
     lib.concatMapStringsSep "\n" mkFlag terminals;
+
+  mkTerminalFeature = mkTerminalFlag "terminal-features";
+  mkTerminalOverride = mkTerminalFlag "terminal-overrides";
 in
 {
   options.my.home.tmux = with lib; {
@@ -28,6 +31,8 @@ in
           hyperlinks = my.mkDisableOption "hyperlinks through OSC8";
 
           trueColor = my.mkDisableOption "24-bit (RGB) color support";
+
+          underscoreStyle = my.mkDisableOption "underscore style/color support";
         };
       });
 
@@ -54,6 +59,20 @@ in
     terminal = "tmux-256color"; # I want accurate termcap info
     aggressiveResize = true; # Automatic resize when switching client size
 
+    # FIXME
+    # * Sixel support
+    # * OSC 133 prompt integration
+    # FIXME: when sensible-on-top is disabled: check if any of those are unset
+    # * tmux bind-key $prefix_without_ctrl last-window
+    # *
+    # * tmux bind-key C-b send-prefix: included
+    # * aggressive resize? done
+    # * tmux bind-key C-p previous-window: done
+    # * tmux bind-key C-n next-window: done
+    # * C-r to refresh my config: done
+    # * tmux set-option -g focus-events on: done
+
+    # FIXME: make PRs for `bind-key` description
     plugins = with pkgs.tmuxPlugins; builtins.filter (attr: attr != { }) [
       # Open high-lighted files in copy mode
       open
@@ -126,6 +145,11 @@ in
       ${mkTerminalFeature "hyperlinks" "hyperlinks"}
       # Force 24-bit color for each relevant $TERM
       ${mkTerminalFeature "trueColor" "RGB"}
+      # Force underscore style/color for each relevant $TERM
+      ${mkTerminalFeature "underscoreStyle" "usstyle"}
+      # FIXME: see https://github.com/folke/tokyonight.nvim#fix-undercurls-in-tmux for additional overrides
+      # ${mkTerminalOverride "underscoreStyle" "Smulx=\\E[4::%p1%dm"}
+      # ${mkTerminalOverride "underscoreStyle" "Setulc=\\E[58::2::::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m"}
     '';
   };
 }

modules/home/xdg/default.nix

@@ -56,4 +56,7 @@ in
     XCOMPOSECACHE = "${dataHome}/X11/xcompose";
     _JAVA_OPTIONS = "-Djava.util.prefs.userRoot=${configHome}/java";
   };
+
+  # Some modules *optionally* use `XDG_*_HOME` when told to
+  config.home.preferXdgDirectories = lib.mkIf cfg.enable true;
 }