From e30dc02e04ba3209b5e7eeab1d49671176fdc064 Mon Sep 17 00:00:00 2001
From: Ethan Reece <contact@ethanreece.com>
Date: Wed, 23 Jul 2025 03:30:59 -0500
Subject: [PATCH] Use different Helix configurations for different Typst
 endpoints

---
 README.md                   | 20 +++++++++++-
 flake.nix                   |  7 ----
 languages/en-us/default.nix |  8 +++++
 languages/typst/default.nix | 64 ++++++++++++++++++++++++-------------
 4 files changed, 68 insertions(+), 31 deletions(-)

diff --git a/README.md b/README.md
index bd237f8..abf3900 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,24 @@ individual languages and editors as needed.
   programming and natural languages.
 - 🏛 **REUSE**: Simplifies software licensing and checks for errors.
 
-## Usage
+## 💡 How it works
+
+`editors/helix` exposes a set of configuration options for `languages.toml`,
+defining the language servers used and the formatters. Although Helix does not
+accept `languages.toml` as an argument, it can read from `.helix/languages.toml`
+in the project directory, so a wrapper automatically creates this file when
+Helix launches.
+
+Because some configuration options do not allow per-file configurations, a
+wrapper script can generate Helix variations with different configurations. For
+example, `typst-default` launches a Helix instance where `tinymist` points to
+`scratch/typst.typ`, whereas `typst-alt` launches a Helix instance pointing to
+`scratch/typst-alt.typ`.
+
+`flake-parts` allows different components to build onto the configuration
+defined in `editors/helix`, so each language in `languages` adds its own
+`language` and `language-server` definitions, but only when enabled.
+
+## 🔧 Usage
 
 Use this [template](https://git.sudoer777.dev/me/nix-flake-template).
diff --git a/flake.nix b/flake.nix
index 2ef5408..c326c0e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,17 +39,10 @@
               en-us = {
                 enable = true;
                 dictionary = [
-                  "Asahi"
-                  "Catppuccin"
-                  "GmbH"
                   "Haug"
                   "Laurenz"
-                  "LLMs"
                   "Mädje"
-                  "Nushell"
                   "Reece"
-                  "SOPS"
-                  "Stylix"
                 ];
                 vale."{**/*.md,**/scratch/vale.txt}".packages = {
                   RedHat.enable = true;
diff --git a/languages/en-us/default.nix b/languages/en-us/default.nix
index 71c4600..47034bb 100644
--- a/languages/en-us/default.nix
+++ b/languages/en-us/default.nix
@@ -216,24 +216,32 @@
         {
           languages.en-us.dictionary = [
             "aarch64"
+            "Asahi"
+            "Catppuccin"
             "Devshell"
             "Dolstra"
             "Eelco"
             "FileCopyrightText"
             "Flake"
+            "formatters"
             "https"
+            "GmbH"
             "Jujutsu"
             "LanguageTool"
+            "LLMs"
             "LTeX"
             "Nix"
             "NixOS"
             "Nixpkgs"
+            "Nushell"
             "qutebrowser"
             "REUSE"
             "SnippetBegin"
             "SnippetCopyrightText"
             "SnippetEnd"
+            "SOPS"
             "SPDX"
+            "Stylix"
             "TODO"
           ];
           editors.helix.languages.language-server = {
diff --git a/languages/typst/default.nix b/languages/typst/default.nix
index 3e6514a..51bf9d6 100644
--- a/languages/typst/default.nix
+++ b/languages/typst/default.nix
@@ -35,11 +35,30 @@
       };
       config = lib.mkIf config.languages.typst.enable (
         let
-          tinymistURL = "127.0.0.1:23635";
           fonts = pkgs.buildEnv {
             name = "fonts";
             paths = config.languages.typst.fonts;
           };
+          tinymist = {
+            url = "127.0.0.1:23635";
+            config = {
+              command = "${pkgs.tinymist}/bin/tinymist";
+              config = {
+                preview.background = {
+                  enabled = true;
+                  args = [
+                    "--data-plane-host=${tinymist.url}"
+                    "--invert-colors=never"
+                  ];
+                };
+                typstExtraArgs = [
+                  "--ignore-system-fonts"
+                  "--font-path"
+                  "${fonts}/share/fonts"
+                ];
+              };
+            };
+          };
         in
         {
           languages.en-us.dictionary = [
@@ -69,32 +88,32 @@
             ];
             language-server.tinymist = {
               command = "${pkgs.tinymist}/bin/tinymist";
-              config = {
-                preview.background = {
-                  enabled = true;
-                  args = [
-                    "--data-plane-host=${tinymistURL}"
-                    "--invert-colors=never"
-                  ];
-                };
-                typstExtraArgs = [
-                  "--ignore-system-fonts"
-                  "--font-path"
-                  "${fonts}/share/fonts"
-                  # "${config.languages.typst.entrypoint}"
-                ];
-              };
+              config = tinymist.config;
             };
           };
           treefmt.programs.typstyle.enable = true;
           devshells.default.commands = lib.mkIf config.editors.helix.enable (
             lib.mapAttrsToList (
               name: value:
-              # (
               let
-                # helix = {
-                #   config =
-                # };
+                tinymist' = tinymist // {
+                  config = tinymist.config // {
+                    config = tinymist.config.config // {
+                      typstExtraArgs = tinymist.config.config.typstExtraArgs ++ [ value ];
+                    };
+                  };
+                };
+                helix' = {
+                  base = config.editors.helix;
+                  config = helix'.base // {
+                    languages = helix'.base.languages // {
+                      language-server = helix'.base.languages.language-server // {
+                        tinymist = tinymist'.config;
+                      };
+                    };
+                  };
+                  package = mkHelixPackage helix'.config;
+                };
               in
               {
                 help = "󰌧 launch Typst editing environment for ${name}";
@@ -105,14 +124,13 @@
                   let git_root = (git rev-parse --show-toplevel | str trim)
                   let file_path = $"($git_root)/${value}"
                   let bg_process = (job spawn { 
-                      ${nixGLPkgs.nixgl.nixGLMesa}/bin/nixGLMesa ${pkgs.qutebrowser}/bin/qutebrowser ${tinymistURL} 
+                      ${nixGLPkgs.nixgl.nixGLMesa}/bin/nixGLMesa ${pkgs.qutebrowser}/bin/qutebrowser ${tinymist.url} 
                   })
-                  ${pkgs.helix}/bin/hx $file_path
+                  ${helix'.package}/bin/hx $file_path
                   job kill $bg_process
                 '';
               }
             ) config.languages.typst.entrypoints
-            # )
           );
         }
       );