add completion and spell, syntax and version checking, deft and treemacs and bibliography settings

settings/syntax-checking-settings.el

@@ -0,0 +1,44 @@
+;;; syntax-checking-settings --- Settings file for syntax checking features
+
+;;; Commentary:
+;; Syntax checking configurations
+
+;; Requirements:
+;; - flycheck  https://melpa.org/#/flycheck  https://github.com/flycheck/flycheck
+
+;; flycheck is used, because flymake supports less languages than flycheck
+
+;; there are in place temporary files for Python, LaTeX and Emacs Lisp, see https://github.com/flycheck/flycheck/issues/92
+;; if working with some kind of cloud sync systems, one may filter "flycheck_*" files
+
+;; no activated yet:
+;; https://melpa.org/#/flycheck-pos-tip require pos-tip
+
+;;; Code:
+;; do not load directly with e.g. (global-flycheck-mode) or via
+;; after-init-hook while loading the init because flycheck will freeze
+;; for a short while. Therefore better defer loading.
+;;(require 'flycheck (concat user-emacs-directory "lisp/flycheck/flycheck.el"))
+(use-package flycheck
+  :load-path (lambda() (concat user-emacs-directory "lisp/flycheck"))
+  :defer 2
+  :init
+  (setq flycheck-mode-line-prefix "𝓕")  ;; Ⓕ 𝓕 ✈ f  ;; other flycheck settings see syntax-checking-settings.el
+  (setq flycheck-mode-line '(:eval (concat (flycheck-mode-line-status-text) " ")))
+  :config
+  (setq-default flycheck-disabled-checkers '(python-flake8))  ;; disable the python-flake8 checker. This will make the next checker which is python-pylint to be used.
+  (setq flycheck-check-syntax-automatically '(save mode-enabled))  ;; flycheck only while saving, default is (save idle-change new-line mode-enabled)
+   ;; flycheck-mode-line-prefix see general-settings-post.el
+  (setq flycheck-emacs-lisp-load-path 'inherit)
+  ;;(add-hook 'after-init-hook #'global-flycheck-mode)  ;; deactivated bc of defer
+  (global-flycheck-mode)
+  )
+
+;; flycheck also has tooltips
+;; flycheck-pos-tip shows errors under point in pos-tip popups.
+;;(require 'flycheck-pos-tip)
+;;(with-eval-after-load 'flycheck
+;;  (flycheck-pos-tip-mode))
+
+(provide 'syntax-checking-settings)
+;;; syntax-checking-settings.el ends here