feat(emacs): org mode basic qol improvements

* CJK zero-width space
* Fonts for CJK characters
* Paste images from clipboard (org-download)
* Line-feed by default
* Visual relative line mode number (instead of physical relative)
* Treemacs: Sidebar file tree in Emacs

tools/emacs.d/.gitignore

@@ -21,3 +21,4 @@ custom.el
 
 .org-id-locations
 bookmarks
+.cache

tools/emacs.d/lisp/init-appearance.el

@@ -1,8 +1,13 @@
 ;;; init-appearance.el
 
+;; Set Font - JetBrains Mono Nerd Font
 (when (display-graphic-p)
   (add-to-list 'default-frame-alist '(font . "JetBrainsMono NF")))
 
+;; Set CJK Display Font - LXGW Wenkai Mono
+(dolist (charset '(kana han cjk-misc bopomofo)) 
+  (set-fontset-font t charset (font-spec :family "霞鹜文楷等宽"))) 
+
 ;; Icon Support
 ;; Once installed, Manually install the fonts required:
 ;; M-x all-the-icons-install-fonts

tools/emacs.d/lisp/init-basic.el

@@ -6,7 +6,14 @@
 ;; Use line number by default
 (global-display-line-numbers-mode 1)
 ;; Vim-like relativenumber
-(setq display-line-numbers-type 'relative)
+;; fix: work for folded region (visual relative line instead of physical)
+(use-package display-line-numbers
+  :config
+  (setq display-line-numbers-type 'visual)
+  (setq display-line-numbers-current-absolute t)
+  :hook
+  (prog-mode . display-line-numbers-mode))
+
 
 ;; Auto input pairred brackets
 (electric-pair-mode 1)

tools/emacs.d/lisp/init-edit.el

@@ -1,5 +1,8 @@
 ;;; init-edit.el
 
+;; Use UTF-8 & LF
+(setq-default buffer-file-coding-system 'utf-8-unix)
+
 ;; Company - Complete Anything
 (use-package company
   :ensure t

tools/emacs.d/lisp/init-file.el

@@ -1,4 +1,4 @@
-;;; init-file.el -- File Management configuration 
+;;; init-file.el -- File Management configuration
 ;;; First edit at 2025/01/29
 
 ;; Dired
@@ -20,5 +20,38 @@
 ;; https://stackoverflow.com/q/1839313
 (setq dired-kill-when-opening-new-dired-buffer t)
 
+;; Treemacs - Sidebar File Tree
+(use-package treemacs
+    :ensure t
+    :defer t
+    :init
+    (with-eval-after-load 'winum
+        (define-key winum-keymap (kbd "M-0") #'treemacs-select-window))
+    :bind
+    (:map global-map
+            ("M-0"       . treemacs-select-window)
+            ("C-x t 1"   . treemacs-delete-other-windows)
+            ("C-x t t"   . treemacs)
+            ("C-x t d"   . treemacs-select-directory)
+            ("C-x t B"   . treemacs-bookmark)
+            ("C-x t C-t" . treemacs-find-file)
+            ("C-x t M-t" . treemacs-find-tag)
+            )
+    )
+
+(use-package treemacs-evil
+  :after (treemacs evil)
+  :ensure t
+  :config
+  ;; Evil treemacs state bindings
+  (define-key evil-treemacs-state-map (kbd "n") #'treemacs-next-line)
+  (define-key evil-treemacs-state-map (kbd "e") #'treemacs-previous-line)
+  (define-key evil-treemacs-state-map (kbd "N") #'treemacs-next-neighbour)
+  (define-key evil-treemacs-state-map (kbd "E") #'treemacs-previous-neighbour)
+  (define-key evil-treemacs-state-map (kbd "H") #'treemacs-toggle-show-dotfiles)
+  (define-key evil-treemacs-state-map (kbd "I") #'treemacs-hide-gitignored-files-mode)
+  ;; Treemacs mode specific binding
+  (evil-define-key 'treemacs treemacs-mode-map (kbd "i") #'treemacs-RET-action))
+
 
 (provide 'init-file)

tools/emacs.d/lisp/init-org.el

@@ -1,12 +1,17 @@
 ;;; init-org.el
 
+;; Use =M-x org-mode-restart= to take effects
+;; After =M-x eval-buffer=
+
 (use-package org
   :ensure nil ;; Use Emacs built-in Org Mode
   :config
   (setq org-log-done 'time)
-  (setq org-startup-indented nil)
+  (setq org-startup-indented t)
   ;; Use inline image
   (setq org-startup-with-inline-images t)
+  (setq org-display-remote-inline-images 'cache) ; 预览网络图片
+
   ;; Use LaTeX rendering
   (setq org-startup-with-latex-preview t)
   (setq org-image-actual-width 600)
@@ -24,6 +29,16 @@
     (evil-define-key 'normal org-mode-map (kbd "SPC a") 'org-agenda-list) ; TODO: Here Simulates the leader
   )
 
+
+;; Set Org Styles
+(setq org-emphasis-alist
+  '(("*" (bold :foreground "cyan" ))
+    ("/" (italic :foreground "green"))
+    ("_" underline)
+    ("=" (org-verbatim verbatim :background "maroon" :foreground "white"))
+    ("~" (org-code verbatim :background "deep sky blue" :foreground "MidnightBlue"))
+    ("+" (:strike-through t))))
+
 (use-package org-bullets
   :after org
   :hook (org-mode . org-bullets-mode))
@@ -44,8 +59,9 @@
 
 (org-babel-do-load-languages
  'org-babel-load-languages
- '( 
+ '(
    (python . t) ; No need to declare C/C++/emacs-lisp since is integrated
+   (shell . t)
    ))
 ;; Use clang as default C/C++ Compiler (Easier to install and configure in Windows)
 (setq org-babel-C-compiler "clang")
@@ -53,5 +69,40 @@
 ;; Don't ask me again when running source block
 (setq org-confirm-babel-evaluate nil)
 
+;; Pasting Images
+;; Use =M-x org-download-clipboard= to paste image
+;; Additional program required: magick
+;; Windows: scoop install imagemagick
+;; org-download config
+(use-package org-download
+  :ensure t
+  :after org
+  :config
+  ;; Hardcoding the image dir
+  (setq-default org-download-image-dir "~/OrgFiles/Attachments")
+
+  (setq org-download-heading-lvl nil ; don't use heading when creating files
+        org-download-timestamp "%Y%m%d-%H%M%S"
+        org-download-screenshot-method "screencapture -i %s"  ; for macOS only
+        org-download-backend 'curl) ; use curl to `download` image
+
+  (org-download-enable)
+
+  :bind (:map org-mode-map
+         ("C-c d c" . org-download-clipboard)    ; 粘贴剪贴板内容
+         ("C-c d s" . org-download-screenshot))) ; 截图
+
+
+;; For CJK users
+;; Insert zero width space around the emphasis symbols, this might be useful for
+;; languages that does not rely on space
+(defun my/insert-emphasis-with-zws (char)
+  (interactive "c")
+  (insert ?\u200B char)
+  (save-excursion (insert char ?\u200B)))
+
+(global-set-key (kbd "C-c b") (lambda () (interactive) (my/insert-emphasis-with-zws ?*)))
+(global-set-key (kbd "C-c i") (lambda () (interactive) (my/insert-emphasis-with-zws ?/)))
+
 
 (provide 'init-org)

tools/emacs.d/lisp/init-package.el

@@ -24,6 +24,13 @@
   (require 'use-package))
 (setq use-package-always-ensure t)
 
+;; use-package offers many syntax sugar.
+;; :bind -> bindkeys
+;; :config -> `(progn do sth)
+;; :init -> (progn do sth)
+;; :after -> (when (featurep 'package)do sth)
+;; :hook -> (add-hook 'some-hook #'some-mode)
+
 ;; This part initialse the GPG Keyring
 ; Disable signature first
 (setq package-check-signature nil)
@@ -44,13 +51,21 @@
 
 ;; Dashboard
 (use-package dashboard
-  ; Open with :dashboard-open<CR>
+  ;; Open with :dashboard-open<CR>
   :after evil
+  :bind (:map dashboard-mode-map
+         ;; Navigation
+         ("n" . dashboard-next-line)
+         ("e" . dashboard-previous-line)
+         ;; Buffer switching
+         ("H" . previous-buffer)
+         ("I" . next-buffer))
   :config
   (dashboard-setup-startup-hook)
-  ; Use Emacs mode to use number to navigate dashboard
-  (evil-set-initial-state 'dashboard-mode 'emacs)
+  (setq dashboard-center-content t)
+  ;; Use Emacs mode to use number to navigate dashboard
   )
+
 ;(use-package dashboard
 ;  :ensure t
 ;  :init
@@ -58,7 +73,6 @@
 ;  :config
 ;  (setq dashboard-banner-logo-title "EMACS")
 ;  (setq dashboard-startup-banner 'official)
-;  (setq dashboard-center-content t)
 ;  (setq dashboard-items '((recents . 5)
 ;			  (bookmark . 5))))
 ;