Zettelkasten, but in a /bin/bash script

With the help of our wonderful overlords, "I" have composed a small bash script to take notes, tag em and move on.
Using #ranger https://github.com/ranger/ranger to explore and #helix https://github.com/helix-editor/helix life's a breeze!! Ok, I still have a little bit of work to do for a fully enjoyable helix experience, but ranger helps ^>

#!/bin/bash

# Function to create a tag file
create_tag_file() {
    touch "notes/$1.md"
    echo "Created tag file: $1.md"
}


# Function to prepend content to tag file
prepend_content_to_tag_file() {
    # Check if the tag file exists
    if [ -f "notes/$1.md" ]; then
        # Temporarily store the existing content
        existing_content=$(cat "notes/$1.md")
        # Write new content to the tag file
        echo "---" > "notes/$1.md"
        echo "title:$2" >> "notes/$1.md"
        echo "tags: [$3]" >> "notes/$1.md"
        echo "file: $5" >> "notes/$1.md"
        echo "---" >> "notes/$1.md"
        # Append the new content to the existing content
        echo "$4" >> "notes/$1.md"
        echo >> "notes/$1.md"
        echo "$existing_content" >> "notes/$1.md"
    else
        # If the tag file doesn't exist, create it and write the new content
        touch "notes/$1.md"
        echo "---" > "notes/$1.md"
        echo "title:$2" >> "notes/$1.md"
        echo "tags: [$3]" >> "notes/$1.md"
        echo "file: $5" >> "notes/$1.md"
        echo "---" >> "notes/$1.md"
        echo "$4" >> "notes/$1.md"
        echo >> "notes/$1.md"
    fi
}

# Function to format tags
format_tags() {
    # Remove non-alphanumeric characters and convert to lowercase
    tags=$(echo "$1" | tr -cd '[:alnum:] ' | tr '[:upper:]' '[:lower:]')
    # Convert space-separated tags to comma-separated string enclosed in square brackets
    formatted_tags=$(echo "[$tags]" | sed 's/ /,/g')
    echo "$formatted_tags"
}

# Create notes directory if it doesn't exist
mkdir -p notes/zetts

# Prompt user for title
read -p "Enter title: " title

# Prompt user for content
read -p "Enter content: " content

# Prompt user for tags
read -p "Enter tags (separated by spaces): " tags_input

# Format tags
formatted_tags=$(format_tags "$tags_input")

# Generate filename with milliseconds since epoch time
filename=$(date +%s%3N).md

# Limit content to 72 characters per line
formatted_content=$(echo "$content" | fold -s -w 72)

# Create YAML headline and write to file
echo -e "---\ntitle:$title\ntags: $formatted_tags\n---\n$formatted_content\n" > "notes/zetts/$filename"

echo "Zett created: notes/zetts/$filename"

# Insert content into all relevant tag files
IFS=',' read -ra tag_array <<< "${formatted_tags:1:-1}"
for tag in "${tag_array[@]}"; do
    tag=$(echo "$tag" | tr -d '[]')
    if [[ ! -z "$tag" ]]; then
        create_tag_file "$tag"
        prepend_content_to_tag_file "$tag" "$title" "$formatted_tags" "$formatted_content" "$filename"
    fi
done

echo "Content inserted into tag files."