Vast improvements to desktop experience

home/modules/default.nix

@@ -0,0 +1,7 @@
+{ ... }:
+
+{
+	imports = [
+		./xonsh.nix
+	];
+}

home/modules/xonsh.nix

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+{ config, pkgs, lib, ... }:
+
+let
+	cfg = config.programs.xonsh;
+
+in with lib; {
+	options = {
+		programs.xonsh = {
+			enable = mkEnableOption "Enable the xonsh program";
+
+			sessionVariables = mkOption {
+				type = types.attrs;
+				default = {};
+				example = { XONSH_TRACE_SUBPROC = true; };
+				description = ''
+					Environment variables that will be set for the Xonsh session.
+				'';
+			};
+
+			aliases = mkOption {
+				type = types.attrsOf types.str;
+				default = {};
+				example = literalExpression ''
+					{
+						ll = "ls -l";
+						la = "ls -a";
+					}
+				'';
+				description = ''
+					An attribute set that maps aliases (the top level attribute names in
+					this option) to command strings or directly to build outputs.
+				'';
+			};
+
+			configHeader = mkOption {
+				type = types.lines;
+				default = "";
+				example = literalExpression ''
+					import os
+					import sys
+				'';
+				description = "An arbitrary string to put at the top of the config file";
+			};
+
+			configFooter = mkOption {
+				type = types.lines;
+				default = "";
+				example = literalExpression ''
+					def _some_method(args):
+						do_command()
+						some_other_thing()
+					aliases['some_method'] = _some_method
+				'';
+				description = "An arbitrary string to put at the end of the config file";
+			};
+		};
+	};
+
+	config =
+	let
+		shortAliases = concatStringsSep "\n" (
+			mapAttrsToList (k: v: "aliases['${k}']='${v}'") cfg.aliases
+		);
+
+		listToPythonList = let
+			listInternals = args:
+			concatStringsSep "\n" (map (v: "'${v}'") args);
+		in list: "[${listInternals list}]";
+
+		sessionVars = concatStringsSep "\n" (
+			mapAttrsToList (k: v:
+				if builtins.typeOf v == "string" then
+					"\$${k} = '${v}'"
+				else if builtins.typeOf v == "list" then
+					"\$${k} = ${listToPythonList}"
+				else if builtins.typeOf v == "int" then
+					"\$${k} = ${toString v}"
+				else ""
+			) cfg.sessionVariables
+		);
+
+	in mkIf cfg.enable {
+
+		home.packages = [ pkgs.xonsh ];
+
+		home.file.".xonshrc".text = ''
+${cfg.configHeader}
+
+${sessionVars}
+
+${shortAliases}
+
+${cfg.configFooter}
+'';
+	};
+}