;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; start emacs server (daemon) via real client so org-mode and other 'workspaces' can be setup as faux daemonized emacs
; (server-start)

;; critical built in for tuning startup
(setq kmn/is-dayjob
  (string= "PCE" (getenv "USERDOMAIN"))
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Packages related
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t) ; this goes in chemacs2 init -- DO NOT UNCOMMENT
(package-initialize) ; this goes in chemacs2 init -- DO NOT UNCOMMENT
(add-to-list 'package-selected-packages
             '(centaur-tabs scratch persistent-scratch persp-mode rainbow-mode rainbow-delimiters markdown-mode focus zoom popwin dired-single diredfl doominhibitinhibit-modeline helpful helm helm-org dired-rainbow dired-rainbow-listing dired-single dash s origami modus-themes use-package)
)
(when (not kmn/is-dayjob)
(add-to-list 'package-selected-packages
             '(devdocs devdocs-browser magit helm-ls-git xclip)
)
)
(require 'use-package)

; helper functions
(require 'subr-x)
(setq kmn/is-termux
  (string-suffix-p "Android" (string-trim (shell-command-to-string "uname -a"))))


; ensure elisp plugins are compiled
(require 'dash)
(require 'f)

(defun was-compiled-p (path)
  "Does the directory at PATH contain any .elc files?"
  (--any-p (f-ext? it "elc") (f-files path)))

(defun ensure-packages-compiled ()
  "If any packages installed with package.el aren't compiled yet, compile them."
  (--each (f-directories package-user-dir)
    (unless (was-compiled-p it)
      (byte-recompile-directory it 0))))

(ensure-packages-compiled)

(unless (was-compiled-p "~/.emacs.d.profiles/common")
      (byte-recompile-directory "~/.emacs.d.profiles/common" 0))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; fix opening urls inside termux
(when kmn/is-termux
  (setq browse-url-browser-function 'browse-url-generic 
        browse-url-generic-program "/data/data/com.termux/files/usr/bin/termux-open"))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; backups
(defconst kmn/backup-dir
  (expand-file-name "backups/" user-emacs-directory))
(unless (file-exists-p kmn/backup-dir)
  (make-directory kmn/backup-dir))
(setq backup-directory-alist `((".*" . ,kmn/backup-dir)))
(setq auto-save-list-file-prefix kmn/backup-dir)
(setq auto-save-file-name-transforms
      `(("\\(?:[^/]*/\\)*\\(.*\\)" ,(concat kmn/backup-dir "\\1") t)))
(setq backup-by-copying t) ; safest form of backup file creation
; Config backups so we have *more*, not less
(setq delete-old-versions t
    kept-new-versions 1
    kept-old-versions 3
    version-control t
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; dired adjustments
(with-eval-after-load 'dired
  (require 'dired-x)
  ;; Set dired-x global variables here.  For example:
  ;; (setq dired-x-hands-off-my-keys nil)
)
(require 'dired-single)
(setq dired-single-use-magic-buffer t)
(setq dired-single-magic-buffer-name "dired - main")

; open dirs in same dired window + open files in main window
; facilitates static file browser sidebar
(defun my/dired-open()
  (interactive)
  (setq file (dired-get-file-for-visit))
  (if (equal (file-directory-p file) t)
    (progn 
      (dired-single-buffer)
    )
    (progn
      (dired-find-file-other-window)
    )
  )
)

(defun my/dired-init ()
  "Bunch of stuff to run for dired, either immediately or when it's
   loaded."
  ;; <add other stuff here>
  (define-key dired-mode-map [remap dired-find-file]
    'my/dired-open)
  (define-key dired-mode-map [remap dired-mouse-find-file-other-window]
    'my/dired-open)
  (define-key dired-mode-map [remap dired-up-directory]
    'dired-single-up-directory))

;; if dired's already loaded, then the keymap will be bound
(if (boundp 'dired-mode-map)
    ;; we're good to go; just add our bindings
    (my/dired-init)
  ;; it's not loaded yet, so add our bindings to the load-hook
  (add-hook 'dired-load-hook 'my/dired-init))

; icons / colors / line tunes
(add-hook 'dired-mode-hook
          (lambda ()
            (interactive)
            (all-the-icons-dired-mode 1)
            (hl-line-mode 1)))
(use-package diredfl
  :commands diredfl-global-mode
  :init
  (diredfl-global-mode))

; hide dired details by default, use `(` to toggle
(add-hook 'dired-mode-hook 'dired-hide-details-mode)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; coding general (in case its ever on)
(add-hook 'prog-mode-hook #'rainbow-delimiters-mode)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; markdown config (used by kmn all over everything)
(use-package markdown-mode
  :ensure t
  :commands (markdown-mode gfm-mode)
  :mode (("README\\.md\\'" . gfm-mode)
         ("\\.md\\'" . markdown-mode)
         ("\\.markdown\\'" . markdown-mode))
  :init (setq markdown-command "multimarkdown"))

(when (not kmn/is-dayjob)
(use-package markdown-preview-mode
  :ensure t
  :if (boundp 'mdcommand)
  :init
  ;(setq markdown-preview-auto-open nil)
  :custom
  (markdown-preview-ws-port 9697)
  (markdown-preview-http-port 9696)
  (markdown-preview-host "127.0.0.1")
  (markdown-preview-http-host "127.0.0.1"))
(setq markdown-preview-stylesheets (list "https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/3.0.1/github-markdown.min.css"))
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; origami config
(use-package origami
  :demand

  :config
  (define-prefix-command 'origami-mode-map)
  (define-key ctl-x-map (kbd "z") 'origami-mode-map)
  (global-origami-mode)

  :bind
  (:map origami-mode-map
   ("o" . origami-open-node)
   ("O" . origami-open-node-recursively)
   ("c" . origami-close-node)
   ("C" . origami-close-node-recursively)
   ("a" . origami-toggle-node)
   ("t" . origami-recursively-toggle-node)
   ("R" . origami-open-all-nodes)
   ("M" . origami-close-all-nodes)
   ("v" . origami-show-only-node)
   ("k" . origami-previous-fold)
   ("j" . origami-forward-fold)
   ("x" . origami-reset)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Setup global keys
(cua-mode 1)
(windmove-default-keybindings 'meta)
(global-set-key (kbd "<escape>") 'keyboard-escape-quit)
(global-set-key (kbd "M-g") 'keyboard-quit)
(global-set-key (kbd "M-m") 'menu-bar-open)
(global-set-key (kbd "<M-f4>") 'delete-frame)
(global-set-key (kbd "C-x C-z") nil)

(global-set-key (kbd "C-g") 'goto-line)
(global-set-key (kbd "C-c u") 'toggle-truncate-lines)
(global-set-key (kbd "C-o") 'helm-find-files)
(global-set-key (kbd "C-k") 'kmn/dired-default-directory-on-left)
(global-set-key (kbd "M-a") 'mark-whole-buffer)
(global-set-key (kbd "C-a") 'kmn/smart-beginning-of-line)
(global-set-key (kbd "C-e") 'kmn/smart-end-of-line)
(global-set-key (kbd "C-c v") 'previous-buffer)
(global-set-key (kbd "C-c w")
                (lambda () 
				  (interactive)
				  (whitespace-mode)
				  (whitespace-newline-mode)
				)
)

(global-set-key (kbd "M-k") 'delete-window)
(global-set-key (kbd "M-\"") 'split-window-below)
(global-set-key (kbd "M-#") 'split-window-right)

;; Lookup the current symbol at point. C-c C-d is a common keybinding
;; for this in lisp modes.
(global-set-key (kbd "M-h") 'describe-bindings)
(global-set-key (kbd "C-c C-d") #'helpful-at-point)

(bind-key* "M-%" 'query-replace-region-or-from-top)
(global-set-key (kbd "C-h") 'query-replace-region-or-from-top)

; more vscode/gui styled find/replace
(global-set-key (kbd "C-s") 'isearch-forward)
(global-set-key (kbd "C-f") 'isearch-forward)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Set some global config
(setq inhibit-splash-screen t) ; why do you need to tell me things i know by default
(setq inhibit-startup-screen t)
(setq inhibit-startup-echo-area-message t)
(setq-default tab-width 4) ; sanity!
(electric-indent-mode 0) ; return should NOT fuck with the indentation of the previous line

;; make typing delete/overwrites selected text
(delete-selection-mode 1)

(setq frame-inhibit-implied-resize t)
(setq pixel-scroll-precision-mode t)

;; UTF-8 as default encoding
(set-default-coding-systems 'utf-8)
(set-language-environment "UTF-8")
(set-default-coding-systems 'utf-8-unix)

; auto revert when files/dired changes
(setq global-auto-revert-non-file-buffers t)
(global-auto-revert-mode 1)

; Clipboard integration
(when (not kmn/is-dayjob)
(use-package xclip :config (xclip-mode 1))
)

;; use y or n instead of yes or no
(fset 'yes-or-no-p 'y-or-n-p)

; org mode syntax highlight code blocks
(setq org-src-fontify-natively t)

; org mode - multiple agenda buffers
(setq org-agenda-sticky t)

; org show file name in refile, also allows refiling to the file as a top level headline
(setq org-refile-use-outline-path 'file)
(setq org-outline-path-complete-in-steps nil)
(setq org-refile-allow-creating-parent-nodes 'confirm)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; set font for emoji -- DOES NOT WORK ON MOBILE
(when (eq system-type 'windows-nt)
(set-fontset-font
 t
 '(#x1f300 . #x1fad0)
 (cond
  ((member "Noto Color Emoji" (font-family-list)) "Noto Color Emoji")
  ((member "Noto Emoji" (font-family-list)) "Noto Emoji")
  ((member "Segoe UI Emoji" (font-family-list)) "Segoe UI Emoji")
  ((member "Symbola" (font-family-list)) "Symbola")
  ((member "Apple Color Emoji" (font-family-list)) "Apple Color Emoji"))
 ;; Apple Color Emoji should be before Symbola, but Richard Stallman skum disabled it.
 ;; GNU Emacs Removes Color Emoji Support on the Mac
 ;; http://ergoemacs.org/misc/emacs_macos_emoji.html
 ;;
 )

(custom-theme-set-faces
    'user
    '(default ((t ( :family "MonoLisa Variable" :height 100))))
    '(variable-pitch ((t (:family "Atkinson Hyperlegible" :height 120))))
    '(fixed-pitch ((t ( :family "MonoLisa Variable" :height 120))))
)

;  (custom-theme-set-faces
;   'user
;   '(org-agenda ((t (:inherit fixed-pitch))))
;   '(org-block ((t (:inherit fixed-pitch))))
;   '(org-code ((t (:inherit (shadow fixed-pitch)))))
;   '(org-document-info ((t (:inherit fixed-pitch))))
;   '(org-document-info-keyword ((t (:inherit (shadow fixed-pitch)))))
;   '(org-indent ((t (:inherit (org-hide fixed-pitch)))))
;   '(org-link ((t (:inherit (shadow fixed-pitch)))))
;   '(org-meta-line ((t (:inherit (font-lock-comment-face fixed-pitch)))))
;   '(org-property-value ((t (:inherit fixed-pitch))) t)
;   '(org-special-keyword ((t (:inherit (font-lock-comment-face fixed-pitch)))))
;   '(org-table ((t (:inherit fixed-pitch))))
;   '(org-tag ((t (:inherit (shadow fixed-pitch) :weight bold :height 0.8))))
;   '(org-verbatim ((t (:inherit (shadow fixed-pitch)))))
;)

;(add-hook 'org-mode-hook 'variable-pitch-mode)

)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; line numbers
; find major mode : M-x eval-expression [enter] major-mode
(require 'display-line-numbers)
(defcustom display-line-numbers-exempt-modes '(org-mode org-agenda-mode)
  "Major modes on which to disable the linum mode, exempts them from global requirement"
  :group 'display-line-numbers
  :type 'list
  :version "green")
(defun display-line-numbers--turn-on ()
  "turn on line numbers but excempting certain majore modes defined in `display-line-numbers-exempt-modes'"
  (if (and
       (not (member major-mode display-line-numbers-exempt-modes))
       (not (minibufferp)))
      (display-line-numbers-mode)))
(global-display-line-numbers-mode)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; whitespace
(progn
  ;; Make whitespace-mode with very basic background coloring for whitespaces.
  ;; http://xahlee.info/emacs/emacs/whitespace-mode.html
  (setq whitespace-style (quote (face spaces tabs newline space-mark tab-mark newline-mark )))

  ;; Make whitespace-mode and whitespace-newline-mode use “¶” for end of line char and “▷” for tab.
  (setq whitespace-display-mappings
        ;; all numbers are unicode codepoint in decimal. e.g. (insert-char 182 1)
        '(
          (space-mark 32 [183] [46]) ; SPACE 32 「 」, 183 MIDDLE DOT 「·」, 46 FULL STOP 「.」
          (newline-mark 10 [8629 10]) ; LINE FEED,
          (tab-mark 9 [8594 9] [92 9]) ; tab
          )))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; modus-themes setup and enable
(require-theme 'modus-themes)
(setq modus-themes-region '(no-extend)
      modus-themes-fringes 'subtle
      modus-themes-scale-headings t
)
(load-theme 'modus-vivendi :no-confirm)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; focus on text (turn on as desired/needed ; off by default
(require 'focus)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; helm
(setq completion-styles '(flex))

(require 'helm-color)
(require 'helm-ls-git)
(require 'helm-bookmark)

(helm-autoresize-mode 1)

(setq helm-display-header-line nil
  helm-autoresize-max-height 30
  helm-autoresize-min-height 30)

(setq helm-split-window-in-side-p       t ; open helm buffer inside current window, not occupy whole other window
  helm-ff-file-name-history-use-recentf t
  helm-echo-input-in-header-line        t)

(global-set-key (kbd "C-x C-d") 'helm-browse-project)
(global-set-key (kbd "C-x b") 'list-buffers)
(global-set-key (kbd "C-x f") 'focus-mode)
(global-set-key (kbd "C-x c") 'focus-read-only-mode)
(define-key global-map [remap find-file] 'helm-find-files)
(define-key global-map [remap occur] 'helm-occur)
(define-key global-map [remap list-buffers] 'helm-buffers-list)
(define-key global-map [remap dabbrev-expand] 'helm-dabbrev)
(define-key global-map [remap execute-extended-command] 'helm-M-x)
(define-key global-map [remap apropos-command] 'helm-apropos)
(define-key global-map [remap bookmark-jump] 'helm-filtered-bookmarks)
(unless (boundp 'completion-in-region-function)
  (define-key lisp-interaction-mode-map [remap completion-at-point] 'helm-lisp-completion-at-point)
  (define-key emacs-lisp-mode-map       [remap completion-at-point] 'helm-lisp-completion-at-point))
(add-hook 'kill-emacs-hook #'(lambda () (and (file-exists-p "$CONF_FILE") (delete-file "$CONF_FILE"))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; activate helm after its fully configured
;(helm-mode 1)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; diminish config
;   https://melpa.org/#/manage-minor-mode
;   M-x: manage-minor-mode
;   
;   M-x: describe-mode
;(require 'diminish)
;(diminish 'rainbow-mode) ; Hide lighter from mode-line
;(diminish 'org-habit) ; im well aware i have org-habit enabled globally. thanks
;(diminish 'helm-mode)
;(diminish 'eldoc-mode)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; doom-modeline
(require 'doom-modeline)
(setq all-the-icons-color-icons nil)
(setq find-file-visit-truename t)
(doom-modeline-mode 1)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; flyspell
(when (not kmn/is-dayjob)
(require 'flyspell)
(setenv "LANG" "en_US")
(setq ispell-program-name "hunspell")
(setq ispell-dictionary "en_US")
(use-package flyspell :demand t
  :config
  (use-package 
    flyspell-correct-helm) 

  (defun flyspell-most-modes() 
    (add-hook 'text-mode-hook (lambda () (flyspell-mode 1) )) 
    (add-hook 'prog-mode-hook (lambda () (flyspell-mode 1) ))
    (dolist (hook '(change-log-mode-hook log-edit-mode-hook org-agenda)) 
      (add-hook hook (lambda () 
                       (flyspell-mode -1))))) 
  (flyspell-most-modes) 
)

(defun flyspell-on-for-buffer-type ()
  "Enable Flyspell appropriately for the major mode of the current buffer.  Uses `flyspell-prog-mode' for modes derived from `prog-mode', so only strings and comments get checked.  All other buffers get `flyspell-mode' to check all text.  If flyspell is already enabled, does nothing."
  (interactive)
  (if (not (symbol-value flyspell-mode)) ; if not already on
	(progn
	  (if (derived-mode-p 'prog-mode)
	    (progn
	      (message "Flyspell on (code)")
	      (flyspell-prog-mode))
	    ;; else
	    (progn
	      (message "Flyspell on (text)")
	      (flyspell-mode 1)))
	  )))
(defun flyspell-toggle ()
    "Turn Flyspell on if it is off, or off if it is on.  When turning on, it uses `flyspell-on-for-buffer-type' so code-vs-text is handled appropriately."
    (interactive)
    (if (symbol-value flyspell-mode)
	  (progn ; flyspell is on, t it off
	    (message "Flyspell off")
	    (flyspell-mode -1))
	  ; else - flyspell is off, turn it on
	  (flyspell-on-for-buffer-type)))

; flyspell keyboard shortcuts
(global-set-key (kbd "C-x y") 'flyspell-toggle)
(global-set-key (kbd "C-x w") 'flyspell-correct-wrapper)
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; zoom (replaces golden-ratio)
(require 'zoom)
(setq zoom-size '(0.618 . 0.618))
(zoom-mode t)
(global-set-key (kbd "C-x +") 'zoom)
; zoom-mode can be bound to a key for toggle purposes
(custom-set-variables
 '(zoom-ignored-major-modes '(dired-mode))
 '(temp-buffer-resize-mode t))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; popup windows
(use-package popwin
  :bind ( :map popwin:keymap
          ("h" . popwin:close-popup-window)
          ("q" . kmn/popwin-quick-ref))
  :config
  (global-set-key (kbd "C-w") popwin:keymap)
  (push "_quick_reference.org" popwin:special-display-config))

(popwin-mode 1)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; devdocs
(when (not kmn/is-dayjob)
(require 'devdocs)
(require 'devdocs-browser)
; devdocs
(setq devdocs-data-dir "~/devdocs.el")
(global-set-key (kbd "C-x m") 'devdocs-lookup)
; devdocs-browser
(setq devdocs-browser-cache-directory  "~/devdocs-browser")
(global-set-key (kbd "C-x n") 'devdocs-browser-open)
)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; tabs-bar
;(tab-bar-mode t)
;(burly-tabs-mode 1)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; tab line via centaur tabs
(require 'centaur-tabs)
(setq centaur-tabs-set-bar 'under)
(setq centaur-tabs-set-close-button nil)
(setq centaur-tabs-set-modified-marker t)
(setq centaur-tabs-set-icons t)
(setq centaur-tabs-plain-icons t)
(setq centaur-tabs-cycle-scope 'tabs)
(setq centaur-tabs-show-new-tab-button nil)
(add-hook 'dired-mode-hook 'centaur-tabs-local-mode)
(add-hook 'org-agenda-mode 'centaur-tabs-local-mode)
(global-set-key (kbd "C-c t i") 'centaur-tabs-backward)
(global-set-key (kbd "C-c t <left>") 'centaur-tabs-backward)
(global-set-key (kbd "C-c t e") 'centaur-tabs-forward)
(global-set-key (kbd "C-c t <right>") 'centaur-tabs-forward)
(global-set-key (kbd "C-c t y") 'centaur-tabs-local-mode)
(global-set-key (kbd "C-c t <down>") 'centaur-tabs-local-mode)
(global-set-key (kbd "C-c t <up>") 'centaur-tabs-local-mode)

(defun centaur-tabs-buffer-groups ()
  "`centaur-tabs-buffer-groups' control buffers' group rules.

Group centaur-tabs with mode if buffer is derived from `eshell-mode' `emacs-lisp-mode' `dired-mode' `org-mode' `magit-mode'.
All buffer name start with * will group to \"Emacs\".
Other buffer group by `centaur-tabs-get-group-name' with project name."
  (list
   (cond
    ((string-equal "*" (substring (buffer-name) 0 1))
         (memq major-mode '(magit-process-mode
                            magit-status-mode
                            magit-diff-mode
                            magit-log-mode
                            magit-file-mode
                            magit-blob-mode
                            magit-blame-mode
                            ))
     "Misc")
    ((derived-mode-p 'dired-mode)
     "Dired")
    ((memq major-mode '(helpful-mode
                        help-mode))
     "Help")
    (t
     (centaur-tabs-get-group-name (current-buffer))))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; persp-mode
(setq persp-auto-resume-time -1.0)
(with-eval-after-load "persp-mode-autoloads"
  (setq wg-morph-on nil) ;; switch off animation
  (setq persp-autokill-buffer-on-remove 'kill-weak)
  (add-hook 'window-setup-hook #'(lambda () (persp-mode 1))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; scratch buffer
; set mode options -- borrowed from : https://emacsredux.com/blog/2014/07/25/configure-the-scratch-buffers-mode/
; fundamental-mode / text-mode / org-mode
(setq initial-major-mode 'text-mode)
(setq initial-scratch-message "original scratch buffer")

; persistent-scratch (melpa)
(persistent-scratch-autosave-mode 0)
(global-set-key (kbd "C-c r S") 'persistent-scratch-save)
(global-set-key (kbd "C-c r r") 'persistent-scratch-restore)
(global-set-key (kbd "C-c r w") 'persistent-scratch-save-to-file)
(global-set-key (kbd "C-c r l") 'persistent-scratch-restore-from-file)

; scratch.el (multi-scratch / melpa)
(global-set-key (kbd "C-c r s") #'scratch) ; C-u C-c s s for mode prompt