Emacs package for previewing LaTeX fragments such as in doxygen comments. Other use-cases are MathJax snippets in html pages and LaTeX equations in stackexchange questions.

Install texfrag via Melpa by <M-x>package-install<RET>texfrag<RET>.

Switch the customization option texfrag-global-mode on to activate texfrag-mode in all buffers with supported major modes.

If you want to activate texfrag only in a specific major mode add texfrag-mode to its mode hook. This works out of the box if the major mode is derived from one of the modes registered in texfrag-setup-alist.

A buffer with activated texfrag has an additional sub-menu "TeX". There you find menu-items for generating AUCTeX previews at point for region and for the full document. The usual key-sequences from AUCTeX such as C-c C-p C-p for Toggle preview at point are also available.

At the time of writing the list of supported major modes is:

• html-mode
  • MathJax LaTeX fragments $$...$$, \[...\], $...$, \(...\), \begin{...}...\end{...} are recognized in the body of the document
  • &, >, and < are translated to &, >, and < in the LaTeX code
• eww-mode
  • same features as html-mode
  • sets LaTeX file name on the base of the url (which may be a file name file://...)
• sx-question-mode
  • recognizes the same LaTeX fragments as html-mode
• prog-mode (formulas in doxygen comments)
  • LaTeX fragments \f$...\f$, \f[...\f], \f{...}...\f}, and \f{...}{...\f} are recognized within comments of the source code (example for the last case: \f{align*}{E=mc^2\f})
• trac-wiki-mode
  • recognized LaTeX fragments: ^{{{\n#!latex\n...^}}} (thereby ^ stands for beginning of line, and \n for a linebreak), $...$, \(...\), \[...\], and \begin{...}...\end{...}
• org-mode
  • recognized LaTeX fragments: $...$, \(...\), \[...\], and \begin{...}...\end{...}
  • restriction: org-html-with-latex is set internally to 'dvipng because only that variant works with texfrag
  • separate function texfrag-org-header for texfrag-header-function that ensures that org LaTeX header options are recognized
• adoc-mode
  • recognized LaTeX fragments:
    • latexmath:[...]
    • stem-blocks of type [latexmath]
    • blocks of type image:...[]
  • global attributes like :imagesdir: are resolved recursively, as required for adoc
  • global attribute settings can be overridden by :local-attr: for texfrag; The first occurence of an attribute wins. E.g., with the following global attributes texfrag would use /temp as image directory and asciidoctor would use the subdirectory images.

      :local-attr: :imagesdir: /temp
      :imagesdir: images
  

All major modes derived from the listed modes are automatically also supported.

Please, inspect the help of the variable texfrag-setup-alist for a complete list of supported modes.

• DONE texfrag-global-mode does not switch on texfrag-mode for eww #13 opened 2 minutes ago by TobiasZawada
• DONE sx: equation end with $$ is misinterpreted as new equation beginning #12 opened 7 hours ago by TobiasZawada
• DONE LaTeX does not accept the UTF8 Byte Order Mark. #11 opened 8 hours ago by TobiasZawada
• DONE Query whether LaTeX should be killed at opening text with texfrag-global-mode and texfrag-preview-buffer-at-start turned on. #10 opened a day ago by TobiasZawada
• DONE TeXfrag leaves LaTeX buffers and output buffers open. #9 opened 14 days ago by TobiasZawada