Reconsider which modules I want enabled

Make some conditional on the system state.

config.org

@@ -511,6 +511,7 @@ I reckon enabling half the modules Doom provides should do it.
 doom                         ; what makes DOOM look the way it does
 doom-dashboard               ; a nifty splash screen for Emacs
 doom-quit                    ; DOOM quit-message prompts when you quit Emacs
+(emoji +unicode)             ; 🙂
 ;;fill-column                ; a `fill-column' indicator
 hl-todo                      ; highlight TODO/FIXME/NOTE/DEPRECATED/HACK/REVIEW
 ;;hydra                      ; quick documentation for related commands
@@ -571,16 +572,16 @@ vterm                        ; the best terminal emulation in Emacs
 #+name: doom-checkers
 #+begin_src emacs-lisp
 syntax                       ; tasing you for every semicolon you forget
-spell                        ; tasing you for misspelling mispelling
+(:if (executable-find "aspell") spell) ; tasing you for misspelling mispelling
 grammar                      ; tasing grammar mistake every you make
 #+end_src
 
 #+name: doom-tools
 #+begin_src emacs-lisp
 ansible                      ; a crucible for infrastructure as code
-debugger                     ; FIXME stepping through code, to help you add bugs
+;;debugger                   ; FIXME stepping through code, to help you add bugs
 ;;direnv                     ; be direct about your environment
-;;docker                     ; port everything to containers
+docker                       ; port everything to containers
 ;;editorconfig               ; let someone else argue about tabs vs spaces
 ;;ein                        ; tame Jupyter notebooks with emacs
 (eval +overlay)              ; run code, run (also, repls)
@@ -633,10 +634,10 @@ ess                          ; emacs speaks statistics
 ;;fsharp                     ; ML stands for Microsoft's Language
 ;;fstar                      ; (dependent) types and (monadic) effects and Z3
 ;;(go +lsp)                  ; the hipster dialect
-(haskell +dante)             ; a language that's lazier than I am
+;; (haskell +lsp)            ; a language that's lazier than I am
 ;;hy                         ; readability of scheme w/ speed of python
 ;;idris                      ;
-;;json                       ; At least it ain't XML
+json                         ; At least it ain't XML
 ;;(java +meghanada)          ; the poster child for carpal tunnel syndrome
 (javascript +lsp)            ; all(hope(abandon(ye(who(enter(here))))))
 ;;julia                      ; a better, faster MATLAB
@@ -691,7 +692,7 @@ I couldn't resist the Email and Feed modules.
 
 #+name: doom-email
 #+begin_src emacs-lisp
-(mu4e +org +gmail)
+(:if (executable-find "mu") (mu4e +org +gmail))
 ;;notmuch
 ;;(wanderlust +gmail)
 #+end_src