feat(emacs): add indent-bars

Author: gekoke

modules/nixos/programs/emacs/default.nix

@@ -18,6 +18,7 @@ in
         extraEmacsPackages = epkgs: [
           epkgs.treesit-grammars.with-all-grammars
           pkgs.elementary.kanagawa-theme
+          pkgs.elementary.indent-bars
         ];
       };
       earlyInitText = readFiles [

modules/nixos/programs/emacs/init.el

@@ -93,6 +93,21 @@
                       space-before-tab
                       tab-mark)))
 
+(use-package indent-bars
+  :hook
+  (prog-mode . indent-bars-mode)
+  (conf-mode . indent-bars-mode)
+  (json-ts-mode . indent-bars-mode)
+  :init
+  (advice-add 'indent-bars--current-indentation-depth :filter-return
+              (lambda (d) (max 0 (1- d))))
+  :custom
+  (indent-bars-color '(highlight :face-bg t :blend 0.1))
+  (indent-bars-pattern ".")
+  (indent-bars-width-frac 0.1)
+  (indent-bars-pad-frac 0.1)
+  (indent-bars-highlight-current-depth '(:blend 1)))
+
 ;; TODO: serialize to file
 (defun gg/set-background-opacity (opacity)
   "Interactively change the current frame's OPACITY."
@@ -658,6 +673,8 @@
 (use-package nix-mode
   :hook (nix-mode . lsp-deferred))
 
+(use-package nix-ts-mode)
+
 (use-package lsp-pyright
   :hook (python-ts-mode . (lambda ()
                             (require 'lsp-pyright)

packages/indent-bars/default.nix

@@ -0,0 +1,26 @@
+{ lib
+, emacsPackages
+, fetchFromGitHub
+, ...
+}:
+emacsPackages.trivialBuild rec {
+  pname = "indent-bars";
+  version = "13cebfa";
+
+  src = fetchFromGitHub {
+    owner = "jdtsmith";
+    repo = "indent-bars";
+    rev = version;
+    hash = "sha256-CY51OLcdR99CFbFlXYoJAX8qvnucORjhzQeT5Kd+v8E=";
+  };
+
+  packageRequires = [
+    emacsPackages.compat
+  ];
+
+  meta = {
+    homepage = "https://github.com/jdtsmith/indent-bars";
+    description = "Fast, configurable indentation guide-bars for Emacs";
+    license = lib.licenses.gpl3;
+  };
+}