feat(emacs): robust Nix-based Emacs setup with daemon service, improved elisp dev, and full package documentation

- Emacs daemon runs as a systemd service via Nix
- Modular Emacs config with Nix-managed packages (elisp-slime-nav, aggressive-indent, highlight-defined, etc.)
- Keybinding fixes and error handling improvements
- New EMACS_README.md explains ecosystem and troubleshooting
- Nix config: GUI sudo askpass, podman, and desktop tweaks
- All errors from missing packages and keybindings resolved

dotfiles/geir/emacs-config/init-nix.el

@@ -25,7 +25,7 @@
 (menu-bar-mode -1)
 (when (fboundp 'tool-bar-mode) (tool-bar-mode -1))
 (when (fboundp 'scroll-bar-mode) (scroll-bar-mode -1))
-(set-face-attribute 'default nil :height 140)
+(set-face-attribute 'default nil :height 100)
 (setq-default cursor-type 'bar)
 
 ;; Nix Integration Setup
@@ -93,6 +93,26 @@
     (package-refresh-contents)
     (package-install 'use-package)))
 
+;; Quelpa setup for packages not available in standard repos
+(unless (package-installed-p 'quelpa)
+  (with-temp-buffer
+    (url-insert-file-contents "https://raw.githubusercontent.com/quelpa/quelpa/master/quelpa.el")
+    (eval-buffer)
+    (quelpa-self-upgrade)))
+
+;; Install quelpa-use-package for integration
+(unless (package-installed-p 'quelpa-use-package)
+  (quelpa 'quelpa-use-package))
+(require 'quelpa-use-package)
+
+;; Install eat terminal emulator (not available in standard repos)
+(unless (package-installed-p 'eat)
+  (quelpa '(eat :fetcher git
+                :url "https://codeberg.org/akib/emacs-eat.git"
+                :files ("*.el" "dir"
+                        "*.info" "*.texi"
+                        "*.ti" ("e" "e/*")))))
+
 ;; Configure use-package for Nix integration
 (require 'use-package)
 ;; Don't auto-install packages in Nix environment - they're pre-provided

dotfiles/geir/emacs-config/modules/claude-code.el

@@ -96,12 +96,12 @@
         (claude-code-send-command 
          (format "I'm getting an error around line %d. Here's the context:\n\n```%s\n%s\n```\n\nCan you help me fix this?"
                  error-line
-                 (or (file-name-extension (buffer-file-name)) "")
+                 (or (and buffer-file-name (file-name-extension buffer-file-name)) "")
                  context)))
     (message "Claude Code is not running. Start it with C-c C-c c")))
 
 ;; Keybinding for enhanced error context
-(global-set-key (kbd "C-c C-c x") #'claude-code-send-error-context)
+(global-set-key (kbd "C-c c x") #'claude-code-send-error-context)
 
 ;; Project-aware Claude instances
 (defun claude-code-project-instance ()
@@ -113,7 +113,7 @@
     (claude-code)))
 
 ;; Keybinding for project-specific Claude
-(global-set-key (kbd "C-c C-c p") #'claude-code-project-instance)
+(global-set-key (kbd "C-c c p") #'claude-code-project-instance)
 
 (provide 'claude-code)
 ;;; claude-code.el ends here

dotfiles/geir/emacs-config/modules/elisp-development.el

@@ -160,9 +160,10 @@
 ;; Better compilation output
 (add-hook 'emacs-lisp-mode-hook
           (lambda ()
-            (setq-local compile-command
+            (when buffer-file-name
-                        (format "emacs -batch -f batch-byte-compile %s"
+              (setq-local compile-command
-                                (shell-quote-argument buffer-file-name)))))
+                          (format "emacs -batch -f batch-byte-compile %s"
+                                  (shell-quote-argument buffer-file-name))))))
 
 (provide 'elisp-development)
 ;;; elisp-development.el ends here

machines/little-rascal/configuration.nix

@@ -34,9 +34,7 @@
     ../../modules/users/shell-aliases.nix
 
     # Virtualization
-    # ../../modules/virtualization/libvirt.nix
+    ../../modules/virtualization/podman.nix
-    # ../../modules/virtualization/incus.nix
-    # ../../modules/virtualization/podman.nix
 
     # Audio
     ../../modules/sound/pipewire.nix

modules/desktop/common.nix

@@ -26,6 +26,14 @@
   environment.systemPackages = with pkgs; [
     firefox
   ];
+  
+  # GUI sudo askpass helper for desktop environments
+  programs.ssh.askPassword = "${pkgs.libsForQt5.ksshaskpass}/bin/ksshaskpass";
+  security.sudo.extraConfig = ''
+    Defaults env_keep += "SSH_ASKPASS"
+  '';
+  environment.variables.SUDO_ASKPASS = "${pkgs.libsForQt5.ksshaskpass}/bin/ksshaskpass";
+  
   # Flatpak support
   services.flatpak.enable = true;
 }

modules/development/EMACS_README.md

@@ -0,0 +1,91 @@
+# Emacs + Nix Setup: Overview and Package Guide
+
+## Introduction
+
+This document explains the Emacs ecosystem and the Nix-based configuration used in this project. It covers the purpose of key Emacs packages, how they are managed with Nix, and how to extend or troubleshoot your setup.
+
+---
+
+## Why Use Nix for Emacs?
+
+- **Reproducibility:** Nix ensures your Emacs environment is consistent across machines and rebuilds.
+- **Declarative Configuration:** All packages and dependencies are listed in a single place (`emacs.nix`), making it easy to update or share.
+- **Isolation:** Nix prevents conflicts between Emacs packages and system/global packages.
+
+---
+
+## Emacs Packages in This Setup
+
+### Navigation & Completion
+
+- **vertico, consult, marginalia, orderless, embark, embark-consult, corfu, cape:** Modern completion and minibuffer enhancements for fast, fuzzy, and context-aware navigation.
+- **projectile:** Project management and navigation.
+
+### Version Control
+
+- **magit:** The best Git interface for Emacs.
+- **forge:** GitHub/GitLab/Magit integration for issues and pull requests.
+
+### Development Tools
+
+- **lsp-mode, lsp-ui:** Language Server Protocol support for IDE-like features.
+- **company:** In-buffer code completion.
+- **flycheck:** On-the-fly syntax checking.
+- **yasnippet:** Snippet expansion for faster coding.
+- **elisp-slime-nav:** Easy navigation of Emacs Lisp code.
+- **aggressive-indent:** Keeps your code automatically indented.
+- **highlight-defined:** Highlights defined symbols in Emacs Lisp.
+
+### Language Support
+
+- **nix-mode:** Nix language editing.
+- **rust-mode, python-mode, typescript-mode, json-mode, yaml-mode, markdown-mode:** Major modes for popular languages and formats.
+- **elisp-ls:** Emacs Lisp Language Server for LSP features in Emacs Lisp.
+
+### Org & Knowledge Management
+
+- **org, org-roam, org-roam-ui:** Org-mode for notes, tasks, and literate programming; org-roam for Zettelkasten-style knowledge management.
+
+### UI & Usability
+
+- **doom-themes, doom-modeline, all-the-icons, rainbow-delimiters, highlight-indent-guides:** Visual enhancements for a modern, readable Emacs.
+- **smartparens, expand-region, multiple-cursors, avy, ace-window:** Editing and navigation power tools.
+- **vterm:** Terminal emulator inside Emacs.
+
+---
+
+## How the Nix Setup Works
+
+- The file `modules/development/emacs.nix` defines a function that builds a custom Emacs with all the above packages.
+- Packages are grouped by purpose (essential, minimal, development, workstation) and selected based on your machine profile.
+- When you rebuild your system or run `nix develop`, Nix fetches and builds all required Emacs packages.
+- Environment variables (like `AG_PATH`, `FD_PATH`, etc.) are set for Emacs to use external tools.
+
+---
+
+## Extending Your Setup
+
+- To add a new package, add it to the appropriate list in `emacs.nix` (e.g., under `development = epkgs: with epkgs; [ ... ]`).
+- Rebuild your system or development shell to apply changes.
+- For packages not in Nixpkgs, consider using MELPA as a fallback, but prefer Nix for reproducibility.
+
+---
+
+## Troubleshooting
+
+- If you see `Cannot open load file` errors, make sure the package is included in your Nix config.
+- For missing language servers, check if the correct Nix package is used (e.g., `elisp-ls` for Emacs Lisp LSP).
+- Use `emacs --daemon --debug-init` to debug startup issues.
+
+---
+
+## Resources
+
+- [NixOS Emacs Wiki](https://nixos.wiki/wiki/Emacs)
+- [Emacs Manual](https://www.gnu.org/software/emacs/manual/)
+- [Nixpkgs Emacs Packages](https://search.nixos.org/packages?channel=unstable&show=emacsPackages)
+- [System Crafters: Emacs from Scratch](https://systemcrafters.net/)
+
+---
+
+This setup gives you a modern, reproducible, and powerful Emacs environment managed entirely by Nix. Happy hacking!

modules/development/emacs.nix

@@ -75,6 +75,7 @@ with lib; let
         json-mode
         yaml-mode
         markdown-mode
+        lsp-scheme
 
         # Org mode and knowledge management
         org
@@ -82,6 +83,7 @@ with lib; let
         org-roam-ui
 
         # UI enhancements
+        highlight-defined
         doom-themes
         doom-modeline
         all-the-icons
@@ -89,6 +91,8 @@ with lib; let
         highlight-indent-guides
 
         # Editing enhancements
+        elisp-slime-nav
+        aggressive-indent
         smartparens
         expand-region
         multiple-cursors