feat: use jj-starship

flake.nix

@@ -62,6 +62,8 @@
                 inputs.helix.overlays.default
                 opencode.overlays.default
                 (final: prev: {
+                  jj-starship = prev.callPackage ./pkgs/jj-starship.nix { };
+
                   # opencode's dev branch asks for Bun 1.3.14, but this revision builds and runs with nixpkgs' Bun 1.3.13.
                   opencode = prev.opencode.overrideAttrs (old: {
                     postPatch = (old.postPatch or "") + ''

home-modules/packages.nix

@@ -149,6 +149,7 @@ in
     mkp224o
     nixfmt
     difftastic
+    jj-starship
     ripgrep
     tea
     trash-cli

home-modules/shell.nix

@@ -1,4 +1,4 @@
-{ ... }:
+{ pkgs, ... }:
 
 {
   programs.helix = {
@@ -23,14 +23,19 @@
     enable = true;
     enableBashIntegration = true;
     settings = {
-      format = "$directory$git_status$nix_shell$cmd_duration$line_break$character";
+      format = "$directory\${custom.jj}$nix_shell$cmd_duration$line_break$character";
       directory.truncation_length = 3;
-      git_status.style = "red";
       git_branch.disabled = true;
+      git_status.disabled = true;
       nix_shell.format = "[$symbol]($style) ";
       cmd_duration.min_time = 500;
       character.success_symbol = "[❯](bold green)";
       character.error_symbol = "[❯](bold red)";
+      custom.jj = {
+        when = "jj-starship detect";
+        shell = [ "${pkgs.jj-starship}/bin/jj-starship" ];
+        format = "$output ";
+      };
     };
   };
 

pkgs/jj-starship.nix

@@ -0,0 +1,40 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitHub,
+  pkg-config,
+  libgit2,
+  zlib,
+  versionCheckHook,
+  withGit ? true,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "jj-starship";
+  version = "0.7.1";
+
+  src = fetchFromGitHub {
+    owner = "dmmulroy";
+    repo = "jj-starship";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-NLds7i1ZmscicaNLmkZCWmc7A+367BXxGioRd4yYof8=";
+  };
+
+  cargoHash = "sha256-i7x/y+BkKH+Xj1bU4RRe9fcteabB+4uAgJuW3x5/jv4=";
+  buildNoDefaultFeatures = !withGit;
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ zlib ] ++ lib.optionals withGit [ libgit2 ];
+
+  doInstallCheck = true;
+  nativeInstallCheckInputs = [ versionCheckHook ];
+
+  meta = {
+    description = "Unified Starship prompt module for Git and Jujutsu repositories that is optimized for latency";
+    homepage = "https://github.com/dmmulroy/jj-starship";
+    changelog = "https://github.com/dmmulroy/jj-starship/releases/tag/v${finalAttrs.version}";
+    license = lib.licenses.mit;
+    mainProgram = "jj-starship";
+  };
+})