Add package installed check to anything that activates automatically

init.el

@@ -125,6 +125,7 @@
 
 ;; Make `describe-*' screens more helpful
 (use-package helpful
+  :if (package-installed-p 'helpful)
   :defines helpful-mode-map
   :bind (("<remap> <describe-command>" . helpful-command)
          ("<remap> <describe-function>" . helpful-callable)
@@ -148,16 +149,10 @@
   :hook ((text-mode . flyspell-mode)
          (prog-mode . flyspell-prog-mode))
   :init
-  (require 'ispell)
+  (require 'ispell))
-  (require 'org)                        ; Fails without org-mode-map for some reason...
-  :custom
-  (flyspell-mode-line-string nil)
-  (flyspell-use-meta-tab nil)
-  :config
-  (require 'flyspell-correct)
-  (require 'consult-flyspell))
 
 (use-package flyspell-correct
+  :if (package-installed-p 'flyspell-correct)
   :after flyspell
   :bind ( :map flyspell-mode-map
           ("C-;" . flyspell-correct-wrapper)))
@@ -173,21 +168,24 @@
   :defines ibuffer-filter-groups
   :bind (("C-c b" . ibuffer)))
 
+(use-package avy
+  :if (package-installed-p 'avy)
+  :bind (("<remap> <goto-char>" . avy-goto-char)))
+
 (use-package ace-window
+  :if (package-installed-p 'ace-window)
   :bind (("<remap> <other-window>" . ace-window))
   :custom
   (aw-scope 'frame)
   (aw-keys '(?a ?s ?d ?f ?g ?h ?j ?k ?l)))
 
 (use-package link-hint
+  :if (package-installed-p 'link-hint)
   :bind (("C-c l o" . link-hint-open-link)
          ("C-c l c" . link-hint-copy-link)
          ("C-c l C-o" . link-hint-open-all-link)
          ("C-c l C-c" . link-hint-copy-all-link)))
 
-(use-package avy
-  :bind (("<remap> <goto-char>" . avy-goto-char)))
-
 (use-package comint
   :bind ( :map comint-mode-map
           ("<remap> <comint-history-isearch-backward-regexp>" . consult-history)))
@@ -240,6 +238,7 @@
 (add-hook 'prog-mode-hook #'(lambda () (display-line-numbers-mode +1)))
 
 (use-package which-key
+  :if (package-installed-p 'which-key)
   :functions which-key-mode
   :config (which-key-mode +1))
 
@@ -258,6 +257,7 @@
   (pulse-momentary-highlight-one-line (point)))
 
 (use-package base16-theme
+  :if (package-installed-p 'base16-theme)
   :demand
   :defines (base16-one-light-theme-colors
             my/load-theme-and-configure)
@@ -287,6 +287,7 @@
   (if (display-graphic-p) (my/load-theme-and-configure)))
 
 (use-package nerd-icons
+  :if (package-installed-p 'nerd-icons)
   :functions (nerd-icons-octicon))
 
 (use-package nerd-icons-dired
@@ -303,12 +304,14 @@
   :hook (after-init . (lambda () (nerd-icons-completion-mode +1))))
 
 (use-package minions
+  :if (package-installed-p 'minions)
   :functions minions-mode
   :hook (after-init . (lambda () (minions-mode +1)))
   :custom
   (minions-prominent-modes '(envrc-mode flymake-mode)))
 
 (use-package ligature
+  :if (package-installed-p 'ligature)
   :functions (ligature-set-ligatures
               global-ligature-mode)
   :config
@@ -352,6 +355,7 @@
   (display-time-24hr-format t))
 
 (use-package diff-hl
+  :if (package-installed-p 'diff-hl)
   :functions (diff-hl-magit-pre-refresh
               diff-hl-magit-post-refresh
               global-diff-hl-mode)
@@ -523,6 +527,7 @@
               "%i" :immediate-finish t))))
 
 (use-package org-roam
+  :if (package-installed-p 'org-roam)
   :after org
   :defines org-roam-directory
   :functions org-roam-db-autosync-mode
@@ -555,6 +560,7 @@
   (org-roam-db-autosync-mode +1))
 
 (use-package org-roam-dailies
+  :requires org-roam
   :custom
   (org-roam-dailies-directory "./")
   (org-roam-dailies-capture-templates
@@ -696,6 +702,7 @@
 (setq org-preview-latex-default-process 'dvisvgm)
 
 (use-package vertico
+  :if (package-installed-p 'vertico)
   :functions vertico-mode
   :hook (after-init . (lambda () (vertico-mode +1)))
   :custom
@@ -704,6 +711,7 @@
   (require 'vertico-directory))
 
 (use-package marginalia
+  :if (package-installed-p 'marginalia)
   :functions marginalia-mode
   :hook (after-init . (lambda () (marginalia-mode +1)))
   :custom
@@ -713,6 +721,7 @@
   :config (marginalia-mode +1))
 
 (use-package orderless
+  :if (package-installed-p 'orderless)
   :custom
   (completion-styles '(orderless basic))
   (completion-category-defaults nil)
@@ -725,6 +734,7 @@
   :requires nerd-icons)
 
 (use-package corfu
+  :if (package-installed-p 'corfu)
   :defines (corfu-map
             corfu-mode-map
             corfu-margin-formatters)
@@ -777,6 +787,7 @@
   :functions corfu-terminal-mode)
 
 (use-package cape
+  :if (package-installed-p 'cape)
   :after corfu
   :functions (cape-emoji
               cape-file
@@ -790,6 +801,7 @@
   (cape-dabbrev-min-length (+ corfu-auto-prefix 1)))
 
 (use-package consult
+  :if (package-installed-p 'consult)
   :functions (consult-org-heading
               consult-history)
   :bind (("<remap> <imenu>" . consult-imenu)
@@ -809,6 +821,7 @@
   :bind (("C-c s s" . consult-eglot-symbols)))
 
 (use-package embark
+  :if (package-installed-p 'embark)
   :functions embark-prefix-help-command
   :bind (("<remap> <describe-bindings>" . embark-bindings)
          ("C-." . embark-act))
@@ -820,6 +833,7 @@
   :hook (embark-collect-mode . consult-preview-at-point-mode))
 
 (use-package tempel
+  :if (package-installed-p 'tempel)
   :defines tempel-path
   :functions (tempel-expand
               tempel-abbrev-mode)
@@ -850,9 +864,11 @@
          )))
 
 (use-package rainbow-delimiters
+  :if (package-installed-p 'rainbow-delimiters)
   :hook (prog-mode))
 
 (use-package envrc
+  :if (package-installed-p 'envrc)
   :hook (after-init . envrc-global-mode)
   :custom
   (envrc-show-summary-in-minibuffer t))
@@ -868,6 +884,7 @@
   (treesit-font-lock-level 3))
 
 (use-package treesit-auto
+  :if (package-installed-p 'treesit-auto)
   :requires treesit
   :functions (treesit-auto-add-to-auto-mode-alist
               global-treesit-auto-mode)
@@ -882,12 +899,10 @@
   (eldoc-echo-area-use-multiline-p 3))
 
 (use-package eglot
-  :demand
   :bind ( :map prog-mode-map
           ("C-c c a" . eglot-code-actions)
           ("C-c c r" . eglot-rename))
-  :hook (((nix-mode lua-mode js-base-mode typescript-ts-base-mode) . eglot-ensure)
+  :hook ((eglot-managed-mode . (lambda () (add-hook 'flymake-diagnostic-functions 'eglot-flymake-backend nil t))))
-         (eglot-managed-mode . (lambda () (add-hook 'flymake-diagnostic-functions 'eglot-flymake-backend nil t))))
   :custom
   (eglot-menu-string "lsp")
   (eglot-send-changes-idle-time 1)
@@ -941,6 +956,7 @@
   )
 
 (use-package apheleia
+  :if (package-installed-p 'apheleia)
   :defines (apheleia-formatters
             apheleia-mode-alist)
   :bind (("C-c c f" . apheleia-format-buffer))
@@ -963,23 +979,27 @@
   (flymake-show-diagnostics-at-end-of-line nil))
 
 (use-package flymake-popon
+  :if (package-installed-p 'flymake-popon)
   :functions flymake-popon-mode
   :requires flymake
   :hook ((flymake-mode . (lambda () (flymake-popon-mode +1)))))
 
 (use-package flymake-shellcheck
-  :if (executable-find "shellcheck")
+  :if (and (executable-find "shellcheck")
+           (package-installed-p 'flymake-shellcheck))
   :requires flymake
   :hook (sh-mode . flymake-shellcheck-load))
 
 (use-package flymake-yamllint
-  :if (executable-find "yamllint")
+  :if (and (executable-find "yamllint")
+           (package-installed-p 'flymake-yamllint))
   :functions flymake-yamllint-setup
   :requires flymake
   :hook (yaml-ts-mode . flymake-yamllint-setup))
 
 (use-package flymake-eslint
-  :if (executable-find "eslint")
+  :if (and (executable-find "eslint")
+           (package-installed-p 'flymake-eslint))
   :functions flymake-eslint-enable
   :requires flymake
   :hook ((js-base-mode typescript-ts-base-mode) . flymake-eslint-enable))
@@ -1033,12 +1053,14 @@ Calls `project-remember-projects-under' for ~/Projects/"
                             ("\\`\\(?:gitea:\\|gt:\\)\\([^:]+\\)\\'" "git.xenia.me.uk" "gitea.user"))))
 
 (use-package aggressive-indent
+  :if (package-installed-p 'aggressive-indent)
   :hook (elisp-mode
          lisp-mode
          lisp-data-mode
          rust-mode))
 
 (use-package nix-mode
+  :if (package-installed-p 'nix-mode)
   :mode "\\.nix\\'"
   :functions nix-prettify-global-mode
   :config
@@ -1067,6 +1089,7 @@ Calls `project-remember-projects-under' for ~/Projects/"
   (setq python-ts-mode-hook python-mode-hook))
 
 (use-package python-docstring
+  :if (package-installed-p 'python-docstring)
   :hook python-base-mode)
 
 (use-package files
@@ -1104,6 +1127,7 @@ Calls `project-remember-projects-under' for ~/Projects/"
   (doc-view-image-width 850))
 
 (use-package markdown-mode
+  :if (package-installed-p 'markdown-mode)
   :hook
   ((markdown-mode . turn-on-auto-fill))
   :custom
@@ -1117,6 +1141,7 @@ Calls `project-remember-projects-under' for ~/Projects/"
   (set-face-attribute 'markdown-comment-face nil :inherit 'variable-pitch))
 
 (use-package pandoc-mode
+  :if (package-installed-p 'pandoc-mode)
   :after (markdown-mode)
   :hook (markdown-mode . conditionally-turn-on-pandoc))
 
@@ -1138,7 +1163,8 @@ Calls `project-remember-projects-under' for ~/Projects/"
   :custom
   (bbdb-file (locate-user-emacs-file "bbdb.gpg")))
 
-(load-file (locate-user-emacs-file "modules/my-mu4e.el"))
+(if (package-installed-p 'mu4e)
+    (load-file (locate-user-emacs-file "modules/my-mu4e.el")))
 
 (use-package erc
   :commands erc-compute-nick