Generate a file with current day as file name based on template. Will create a folder based on current month and save the file inside.

new-post.sh

#!/usr/bin/env bash

check() {
    test "$@" && echo true || echo false
}

show_help() {
    echo -e "Generate a file with current day as file name based on template. Will create a folder based on current month and save the file inside.\n"
    echo -e "Usage: new-post.sh template_path output_parent_directory.\n"
    echo -e "Example: ./new-post.sh ./template.md ./posts
    Output:
        📁 Creating directory ./posts/2021-05.
        📝 Created new post ./posts/2021-05/2021-05-02.md."
}

create_folder_if_no_exists() {
    directory_path=$1
    directory_exists="$(check -d ${directory_path})"

    if  [[ $directory_exists == "false" ]] ; then
        echo -e "📁 Creating directory ${directory_path}."
        mkdir -p ${directory_path}
    fi
}

create_post() {
    template=$1
    new_post=$2
    file_exists="$(check -e ${new_post})"

    if [[ $file_exists == "true" ]] ; then
        echo -e "⚠️  Post ${new_post} already exists."
    else 
        {
            cp ${template} ${new_post} &&
            echo -e "📝 Created new post ${new_post}."
        } || {
            echo -e "⚠️  Error creating new post."
        }
    fi
}

main() {
    DEBUG=false

    if [[ $1 == "--help" || $1 == "-h" ]] ; then
        show_help
    else
        today=$(date '+%Y-%m-%d')
        current_month=${today:0:7}
        template="$(echo $1)"
        template_extension=${template##*.}
        output_directory="$(echo $2)/${current_month}"
        new_post=${output_directory}/${today}.${template_extension}

        create_folder_if_no_exists  ${output_directory}
        create_post ${template} ${new_post}

        if $DEBUG ; then
            echo "today = ${today}"
            echo "current_month = ${current_month}"
            echo "template = ${template}"
            echo "template_extension = ${template_extension}"
            echo "output_directory = ${output_directory}"
            echo "new_post = ${new_post}"
        fi
    fi
}

main "$@"