use MarkTex to convert obsidian markdown to latex

marktex_postprocess.pl

# 去除代码块后面的%
$enter_code = 0;
while(<>) {
  if(/\\begin\{langbox\}/) {
    $enter_code = 1;
  } elsif(/\\end\{langbox\}/) {
    $enter_code = 0;
  }
  if($enter_code) {
    s/%(\s*)$/$1/;
  }
  print;
}

marktex_prepocess.pl

use open qw( :std :encoding(UTF-8) );
if (! open fh, "<$ARGV[0]") {  
  die "cannot open ";
}

@lines = <fh>;

# 第一遍扫描, 确定heading_map
foreach(@lines) {
  if(/^(##{1,6})\s/) { # 其实注释也不难处理, 但是一般不用, 就不处理了
    $level = (tr/#//);
    $heading[$level] = 1;
  }
}

$cur_level = 1;
for ($i = 1; $i <= 6; $i++) {
  if($heading[$i]==1) {
    $heading_map[$i]=$cur_level;
    ++$cur_level;
  }
}
# 输出行
$notes_prefix="/Users/quebec/notes/vx_attachments/";
foreach(@lines) {
  if(/^(##{1,6})\s/) { # 其实注释也不难处理, 但是一般不用, 就不处理了
    $level = (tr/#//);
    $new_heading = '#' x $heading_map[$level];
    s/^(##{1,6})/$new_heading/;
  } else {
    s{!\[\[([^\]]+)\.(png|jpg|jpeg)(\|\d+)?\]\]}{"![](" . (substr($1,0,1) eq '/' ? "$1" : "$notes_prefix$1")  . ".$2)"}eig;

  }
  print;
}

md2tex.sh

#! /bin/zsh
set -e
filename=${1##*/}
basename=${filename%%.md}
mid_md_file=$MHOME/box/markdown2latex/${filename}
perl $MHOME/box/markdown2latex/marktex_prepocess.pl $1 > $mid_md_file
python /Users/quebec/box/markdown2latex/MarkTex/marktex/cli.py $mid_md_file -o $MHOME/box/markdown2latex/out/
perl -i $MHOME/box/markdown2latex/marktex_postprocess.pl $MHOME/box/markdown2latex/out/${basename}.tex
cd $MHOME/box/markdown2latex/out/
latexmk ${basename}.tex
cp $MHOME/box/markdown2latex/out/${basename}.pdf ~/Downloads/
open ~/Downloads/${basename}.pdf

preprocess does such a thing: if only level 3 and level 5 heading appears, then level 3 becomes level 1, level 5 becomes level 2.
It also convert wikilinks in obsidian to markdown image syntax.

postprocess aims to remove trailing percent signs(%).