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+(define-module (tw services dev-env)
+  #:use-module (gnu)
+  #:use-module (gnu home services)
+  #:use-module (gnu home services shepherd)
+  #:use-module ((gnu packages commencement) #:select (gcc-toolchain))
+  #:use-module ((gnu packages databases) #:select (emacs-rec-mode))
+  #:use-module ((gnu packages elf) #:select (patchelf elfutils))
+  #:use-module (gnu packages emacs)
+  #:use-module (gnu packages emacs-xyz)
+  #:use-module ((gnu packages finance) #:select (emacs-ledger-mode))
+  #:use-module ((gnu packages haskell-apps) #:select (shellcheck))
+  #:use-module ((gnu packages llvm) #:select (clang))
+  #:use-module ((gnu packages python-xyz) #:select (python-lsp-server python-yamllint))
+  #:use-module ((gnu packages sqlite) #:select (sqlite))
+  #:use-module (gnu packages tree-sitter)
+  #:use-module (gnu packages vim)
+  #:use-module (gnu services configuration)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module ((tw theme) #:select (catppuccin-emacs catppuccin-vim))
+  #:export (home-emacs-configuration
+            home-emacs-service-type
+            home-vim-configuration
+            home-vim-service-type))
+
+
+
+(define (vim-environment config)
+  '(("EDITOR" . "vim")))   ; we define no ASYNC_EDITOR
+
+(define (vim-xdg-config config)
+  `((".vim/vimrc" ,(local-file "files/vimrc"))
+    (".vim/catppuccin.vim" ,catppuccin-vim)))
+
+;; In non-graphical environments, install vim as an editor.  Neovim might be
+;; better, but doesn't have an equivalent to `vim-surround' packaged.
+(define (vim-packages config)
+  (list vim vim-surround))
+
+(define (emacs-environment config)
+  '(("EDITOR" . "emacsclient -qc")
+    ;; Tell emacsclient to return immediately after opening the file.  I
+    ;; can't put this in $EDITOR as many programs expect $EDITOR to exit
+    ;; only when the user is done editing.
+    ("ASYNC_EDITOR" . "emacsclient -qcn")))
+
+(define (emacs-xdg-config config)
+  `(("emacs/include" ,(local-file "files/emacs-packages" #:recursive? #t))
+    ("emacs/init.el" ,(local-file "files/emacs-init.el"))
+    ("emacs/catppuccin-theme.el" ,catppuccin-emacs)))
+
+(define (emacs-files config)
+  `((".local/share/applications/emacsclient.desktop"
+     ,(local-file "files/emacsclient.desktop"))))
+
+(define (emacs-daemon config)
+  (list (shepherd-service
+         (documentation "Emacs server; connect using emacsclient.")
+         (provision '(emacs))
+         (requirement '(x11-display))
+         (start #~(make-forkexec-constructor
+                   (list #$(file-append emacs "/bin/emacs") "--fg-daemon")))
+         (stop #~(make-kill-destructor)))))
+
+(define (emacs-packages config)
+  (list
+   ;; Development & language servers
+   gnu-make python-lsp-server python-yamllint shellcheck gcc-toolchain binutils patchelf elfutils
+   clang           ; for clangd
+   glibc           ; for ldd
+
+   ;; Emacs general
+   emacs ; for Wayland, switch to emacs-pgtk for better fractional scaling support
+   emacs-use-package
+   emacs-gcmh
+   emacs-eglot
+   emacs-counsel
+   emacs-counsel-dash sqlite ; emacs-counsel-dash requires the sqlite3 binary
+   emacs-ivy
+   emacs-company emacs-company-quickhelp emacs-company-posframe
+   emacs-undo-tree
+   emacs-aggressive-indent
+   emacs-which-key
+   emacs-smart-mode-line
+   emacs-diminish
+   emacs-rainbow-mode
+   emacs-form-feed
+   emacs-guix
+   ;; TODO: emacs-editorconfig emacs-sly emacs-sly-macrostep
+   emacs-org                         ; emacs-org-modern theme?
+
+   ;; Emacs Evil
+   emacs-evil
+   emacs-evil-collection
+   emacs-evil-expat ; for :reverse, :remove, :rename, :colo, :g*, ... ex commands
+   emacs-evil-surround
+   ;; emacs-evil-owl  ; tests failing
+   emacs-evil-args
+   emacs-evil-numbers
+   emacs-evil-multiedit
+   emacs-evil-goggles
+   emacs-evil-traces
+   emacs-evil-commentary
+   emacs-evil-replace-with-register
+   emacs-evil-cleverparens
+   emacs-evil-org
+   emacs-evil-markdown
+   emacs-evil-tex
+   emacs-evil-text-object-python
+
+   ;; Emacs language modes
+   emacs-flymake-collection
+   emacs-geiser emacs-geiser-guile
+   emacs-sly
+   emacs-gnuplot
+   emacs-graphviz-dot-mode
+   emacs-haskell-mode
+   emacs-hcl-mode
+   emacs-ledger-mode
+   emacs-mmm-mode
+   emacs-puppet-mode
+   emacs-rec-mode
+   emacs-web-mode
+   emacs-yaml-mode
+
+   ;; Tree sitter libraries, for Emacs' built-in X-ts-modes.
+   tree-sitter-bash
+   tree-sitter-c
+   tree-sitter-cmake
+   tree-sitter-cpp
+   tree-sitter-css
+   tree-sitter-dockerfile
+   tree-sitter-javascript
+   tree-sitter-json
+   tree-sitter-python
+   tree-sitter-ruby))
+
+(define-public home-basic-dev-env-service-type
+  (service-type
+   (name 'basic-dev-env)
+   (description "Set up a basic development environment using vim.")
+   (default-value #f)
+   (extensions
+    (list (service-extension home-profile-service-type vim-packages)
+          (service-extension home-xdg-configuration-files-service-type vim-xdg-config)
+          (service-extension home-environment-variables-service-type vim-environment)))))
+
+(define-public home-full-dev-env-service-type
+  (service-type
+   (name 'full-dev-env)
+   (description "Set up a full-featured, interactive development environment using Emacs.")
+   (default-value #f)
+   (extensions
+    (list (service-extension home-profile-service-type emacs-packages)
+          (service-extension home-xdg-configuration-files-service-type emacs-xdg-config)
+          (service-extension home-files-service-type emacs-files)
+          (service-extension home-environment-variables-service-type emacs-environment)
+          (service-extension home-shepherd-service-type emacs-daemon)))))