プレゼンで使う数式画像を作成する[vim + vim-quickrun + latexmk + dvipng] ref: http://qiita.com/ssh0/items/2113db858ba5c9fd05df

.latexmkrc_dvipng

#!/usr/bin/perl
$latex = 'platex -interaction=nonstopmode -kanji=utf-8 %O %S';
$pdf_mode = 0;

.vimrc

augroup texmath
  autocmd!
  autocmd FileType texmath setlocal syntax=tex
augroup END

fig_test.tex

\documentclass[43pt]{jsarticle}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{ascmac}
\pagestyle{empty}

% "\vector{a}" でベクトル
\def\vector#1{\mbox{\boldmath \(#1\)}}

\begin{document}
\begin{align*}
    f(x) &= \int^{\infty}_{-\infty}\mathrm{d}x \frac{\sin x}{x} \\
         &= \pi
\end{align*}
\newpage
$\vector{x} = (x_{1}, x_{2})$
\newpage
$\mathcal{C}$
\end{document}

file0.txt

platex fig_test.tex
dvipng -T tight -bd 1000 fig_test.dvi

file5.txt

texmath fig_test.tex

template.texmath

\documentclass[43pt]{jsarticle}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{ascmac}
\pagestyle{empty}

% "\vector{a}" でベクトル
\def\vector#1{\mbox{\boldmath \(#1\)}}

\begin{document}

\end{document}

tex_quickrun.vim

" LaTeX Quickrun (texmath)
let g:quickrun_config['texmath'] = {
\ 'runner' : 'vimproc',
\ 'command' : 'texmath',
\ 'outputter' : 'error',
\ 'outputter/error/success' : 'null',
\ 'outputter/error/error' : 'quickfix',
\ 'srcfile' : expand("%s"),
\ 'exec': '%c %s',
\}

augroup latex_autocompile
  autocmd!
  if g:quickrun_user_tex_autorun != 0
    autocmd BufWritePost,FileWritePost *.tex :QuickRun
    autocmd BufWritePost,FileWritePost fig*.tex :QuickRun -type texmath
  endif
augroup END

texmath

#!/bin/bash -e
# written by Shotaro Fujimoto (https://github.com/ssh0)
# first edited: 2015-11-03

# using latexmk rc file
latexmkrc="$HOME/.latexmkrc_dvipng"

usage() {
  cat <<EOF

NAME
      texmath - compile latex to png with dvipng (and create texmath file)

USAGE
      texmath [-e FILE | FILE] [-h]

ARGUMENTS
      -e FILE: Open and edit FILE.
               Or create it when FILE doesn't exist, 

      FILE:    If you provide only file name, this script compiles the file with
               latexmk and then creates png file by dvipng.

      --help:  Display this help and exit

EOF
  exit 1
}

texmathtemplate="$(cat <<EOF
% vim: ft=texmath
\documentclass[43pt]{jsarticle}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{ascmac}
\pagestyle{empty}

% '\vector{a}' でベクトル
\def\vector#1{\mbox{\boldmath \(#1\)}}

\begin{document}
\begin{eqnarray*}

\end{eqnarray*}
\newpage
\end{document}
EOF
)"

if [ "$1" = "-h" ]; then
  usage
elif [ "$1" = "-e" ]; then
  if [ -f "$2" ]; then
    texfile="$2"
  elif [ ! "$2" = "" ]; then
    texfile="$2"
    echo "$texmathtemplate" > "$texfile"
  else
    echo "Option '-e' needs a file name to edit."
    echo "Aborted."
    exit 1
  fi
  vim "$texfile"
elif [ ! -f "$1" ]; then
  echo "'$1' doesn't exist."
  echo "Aborted."
  exit 1
elif [ -f "$1" ]; then
  texfile="$1"
  latexmk -r "$latexmkrc" "${texfile}" \
  && latexmk -c "${texfile}" \
  && dvipng -T tight -bd 1000 "${texfile%.tex}.dvi" \
  && rm *.fls
else
  usage
fi

texmath_quickrun.vim

" LaTeX Quickrun (texmath)
let g:quickrun_config['texmath'] = {
\ 'runner' : 'vimproc',
\ 'command' : 'texmath',
\ 'outputter' : 'error',
\ 'outputter/error/success' : 'null',
\ 'outputter/error/error' : 'quickfix',
\ 'srcfile' : expand("%s"),
\ 'exec': '%c %s',
\}

augroup texmath_autocompile
  autocmd!
  autocmd BufWritePost,FileWritePost *.tex :QuickRun
augroup END