(setq org-preview-latex-default-process 'dvisvgm) ; generate SVG for better image.
(setq org-latex-image-default-width "2.0\\linewidth")
(setq org-format-latex-options
      (plist-put org-format-latex-options :scale 2.0)) ; adjust LaTeX preview image size.
(setq org-format-latex-options
      (plist-put org-format-latex-options :html-scale 2.5)) ; adjust HTML exporting LaTeX image size.

;;; Org export to LaTeX default headers.
;; set LaTeX default font
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setmainfont{DejaVu Sans}"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setsansfont{DejaVu Serif}"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setmonofont{DejaVu Sans Mono}"))

;;; export to PDF with src blocks syntax highlighting.
(setq org-latex-listings 'minted)
(add-to-list 'org-latex-packages-alist '("" "minted"))
(setq org-latex-minted-options
      '(("frame" "lines")
        ("linenos" "true") ; enable number lines
        ;; ("frame" "single") ; box frame
        ("escapeinside" "$$") ; escape to LaTeX between the two characters specified in $$.
        ("mathescape" "true") ; escape and interrupt math in src block
        ("texcomments" "true") ; enable LaTeX code inside comments
        ("numbersep" "5pt") ; gap between numbers and start of line
        ("framesep" "2mm") ; distance between frame and content
        ;; ("fontsize" "??") ; font size in code block
        ("breaklines" "true")
        ))
;; (add-to-list 'org-latex-minted-langs '(clojure "Clojure"))
;; (add-to-list 'org-latex-pdf-process
;;                "latexmk -shell-escape -bibtex -xelatex -g -f %f")
;;; Org-mode export to -> Chinese TeX (ctex) -> PDF
;;; set default LaTeX engine to xetex
(setq-default TeX-engine 'xetex)
(add-to-list 'org-latex-packages-alist '("" "ctex"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\usepackage[utf8]{ctex}"))
;; (setq org-format-latex-header
;;       (concat org-format-latex-header "\n" "\\usepackage{xeCJK}"))
;;; set latex to xelatex engine.
(setq org-latex-pdf-process
      '("xelatex -8bit --shell-escape  -interaction=nonstopmode -output-directory %o %f"
        "xelatex -8bit --shell-escape  -interaction=nonstopmode -output-directory %o %f"
        "xelatex -8bit --shell-escape  -interaction=nonstopmode -output-directory %o %f"))
;; specify src block syntax highlighting color scheme
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\usemintedstyle{manni}"))
;; set src block
(setq org-format-latex-header
      (concat org-format-latex-header "\n"
              "\\lstset{frame=shadowbox,
numbers=left,
numberstyle= \\tiny,
keywordstyle= \\color{ blue!70},commentstyle=\\color{red!50!green!50!blue!50},
rulesepcolor= \\color{ red!20!green!20!blue!20}"))

;;; support for export Chinese LaTeX to PDF
(setf org-latex-default-packages-alist
      (remove '("AUTO" "inputenc" t ("pdflatex")) org-latex-default-packages-alist))
;;; set font for Chinese
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\usepackage{fontspec}"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setCJKmainfont[scale=0.6]{WenQuanYi Micro Hei}"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setCJKsansfont{WenQuanYi Micro Hei}"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\setCJKmonofont{WenQuanYi Micro Hei Mono}"))
;; set PDF file default font size. (Chinese)
(setq org-format-latex-header
      (replace-regexp-in-string
       "documentclass{article}"
       "documentclass[fontsize=5pt]{article}"
       org-format-latex-header))
;; Chinese linebreak
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\XeTeXlinebreaklocale \"zh\""))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\XeTeXlinebreakskip = 0pt plus 1pt minus 0.1pt"))
;; CJKulem
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\usepackage{CJKulem}"))
;; page style
(add-to-list 'org-latex-packages-alist '("" "fancyhdr"))
(setq org-format-latex-header
      (concat org-format-latex-header "\n" "\\pagestyle{fancy}"))