A bash script to create a Jekyll post.

create_post.sh

#!/bin/bash

DATE=$(date '+%Y-%m-%d')
DATETIME=$(date '+%Y-%m-%d %H:%M')
POSTS_DIR="./_posts/"
DRAFTS_DIR="./_drafts/"
IMAGES_BASE_DIR="./images/"

for arg in "$@"; do
    case $arg in
        -c|--category)
            # Add a category (optional)
            CATEGORY="$2"
            shift
        ;;

        -d|--draft)
            # The post is a draft
            POSTS_DIR=$DRAFTS_DIR
            shift
        ;;

        -i|--images-dir)
            # Create a new directory for images
            CREATE_IMAGES_DIR="YES"
            shift
        ;;

        -l|--layout)
            # Change the default layout
            LAYOUT=$2
            shift
        ;;

        -t|--title)
            # Post title
            TITLE="$2"
            shift
        ;;

        *)
            # Unrecognized parameter (skip)
            shift
        ;;
    esac
done

if [ "$TITLE" ]; then
    # Create the directory if not exsts
    if [ ! -d "$POSTS_DIR" ]; then
        mkdir "$POSTS_DIR"
    fi

    # Prepare the slug
    SLUG=$TITLE
    SLUG="$(echo -n "$SLUG" | sed -e 's/[^[:alnum:]]/-/g')"
    SLUG="$(echo -n "$SLUG" | tr -s '-')"
    SLUG="$(echo -n "$SLUG" | tr A-Z a-z)"
    SLUG="$(echo -n "$SLUG" | sed 'y/ąćęłńóśźż/acelnoszz/')"
    SLUG="$(echo -n "$SLUG" | sed -e 's/^[\-]*//' -e 's/[\-]*$//')"

    # Prepare the file name
    FILE="${POSTS_DIR}${DATE}-${SLUG}.md"

    # Create a new directory for post images
    if [ "$CREATE_IMAGES_DIR" ] && [ -d "$IMAGES_BASE_DIR" ]; then
        mkdir "${IMAGES_BASE_DIR}${SLUG}"
    fi

    # Check if file exists
    if [ ! -f "$FILE" ]; then
        echo "File: $FILE"
        echo "---" >> $FILE
        [ "$LAYOUT" ] && echo "layout: $LAYOUT" >> $FILE
        [ "$CATEGORY" ] && echo "category: $CATEGORY" >> $FILE
        echo "title: \"$TITLE\"" >> $FILE
        echo "date: $DATETIME" >> $FILE
        echo "---" >> $FILE
    else
        echo "File \"$FILE\" alredy exists!"
        echo "Try a different title."
    fi
else
    echo "The title is required!"
    echo "Usage:"
    echo "    $0 -t title"
    echo "Optional parameters:"
    echo "    -c <category name>        Category"
    echo "    -d                        Draft"
    echo "    -i                        Images directory"
    echo "    -l <layout name>          Layout"
fi