Simple script to migrate from my old blog to new blog

porting.sh

#!/bin/bash

function fix_metadata() {
    i="$1"
    fname="$2"
    line="$3"

    if [ "`echo "$line" | grep 'Title'`" ]; then
        sed -i -e "${i}s/Title/title/g" "$fname"
    elif [ "`echo "$line" | grep 'Tags'`" ]; then
        sed -i -e "${i}s/Tags/tags/g" "$fname"
    elif [ "`echo "$line" | grep 'Date'`" ]; then
        sed -i -e "${i}s/Date/date/g" "$fname"
        # when specified time
        if [ "`head -$i "$fname" | tail -n1 | sed -e 's/date://g' | grep ':'`" ]; then
            sed -i "${i}s/$/:00/" "$fname"
        else
            sed -i "${i}s/$/ 00:00:00/" "$fname"
        fi
    else
        sed -i "${i}d" "$fname"
        return 1
    fi

    return 0
}

function counter() {
    fname="$1"
    i=1
    while read line; do
        if [ "`echo "$line" | grep ':'`" ]; then
            i=$((++i))
            fix_metadata "$i" "$fname" "$line"
            res=$?
            if [ $res -eq 1 ]; then
                i=$((--i))
            fi
        elif [ "$line" != "---" ]; then
            break
        fi
    done < "$fname"
    echo $((++i))
}

function caldic() {
    if [ "`echo "$1" | grep 'Jan'`" ]; then
        echo 01
    elif [ "`echo "$1" | grep 'Feb'`" ]; then
        echo 02
    elif [ "`echo "$1" | grep 'Mar'`" ]; then
        echo 03
    elif [ "`echo "$1" | grep 'Apr'`" ]; then
        echo 04
    elif [ "`echo "$1" | grep 'May'`" ]; then
        echo 05
    elif [ "`echo "$1" | grep 'Jun'`" ]; then
        echo 06
    elif [ "`echo "$1" | grep 'Jul'`" ]; then
        echo 07
    elif [ "`echo "$1" | grep 'Aug'`" ]; then
        echo 08
    elif [ "`echo "$1" | grep 'Sep'`" ]; then
        echo 09
    elif [ "`echo "$1" | grep 'Oct'`" ]; then
        echo 10
    elif [ "`echo "$1" | grep 'Nov'`" ]; then
        echo 11
    elif [ "`echo "$1" | grep 'Dec'`" ]; then
        echo 12
    fi
}

function escape_katex() {
    beg="mathjaxbegin"
    end="mathjaxend"
    sed -i -e "s/\\\\\\\\(/$beg/g" "$filename" 
    sed -i -e "s/\\\\\\\\)/$end/g" "$filename" 
    sed -i -e "s/\\\(/\(/g" "$filename"
    sed -i -e "s/\\\)/\)/g" "$filename"
    sed -i -e "s/$beg/\\\\\\\\(/g" "$filename"
    sed -i -e "s/$end/\\\\\\\\)/g" "$filename"
    # https://github.com/KaTeX/KaTeX/issues/2003
    sed -i -e 's/\\label{eq:[^}]*}//g' "$filename" 
    sed -i -e 's/\\eqref{eq:[^}]*}//g' "$filename"
    sed -i -e 's/\\_/_/g' "$filename"
    sed -i -e 's/\\\\{/{/g' "$filename"
    sed -i -e 's/\\\\}/}/g' "$filename"
    sed -i -e 's/\\left{/{/g' "$filename"
    sed -i -e 's/\\right}/}/g' "$filename"
    sed -i -e 's/\\left(/(/g' "$filename"
    sed -i -e 's/\\right)/)/g' "$filename"
    sed -i -e 's/\\\[0,2\\pi\\\]/[0,2\\pi]/g' "$filename"
    sed -i -e 's/\\\[0,\\infty\\\]/[0,\\infty]/g' "$filename"

}

function porting() {
    target_year="$1"
    for dirname in $(ls -1 "$target_year"); do
        cal_num=$(caldic "$dirname")
        mv "$target_year/$dirname" "$target_year/$cal_num"
    done

    while read -d '' filename; do
        sed -i "1s/^/---\n/" "$filename"
        insert_target_line=$(counter "${filename}" < /dev/null)
        echo "$filename"
        sed -i "${insert_target_line}s/^/---\n/" "$filename"
        escape_katex "$filename"
    done < <(find "$target_year" -name "index.md" -type f -print0)
}

porting "$1"