fzf_previewer

#!/bin/bash

# use tree for dir
# else use bat
# used for fzf preview

# Function to find the index of the last space within a substring
find_last_space() {
    local str="$1"
    local substring_length="$2"
    local last_space_index=-1

    for (( i=$substring_length; i>=0; i-- )); do
        if [ "${str:i:1}" = " " ]; then
            last_space_index=$i
            break
        fi
    done

    echo "$last_space_index"
}

# Function to format input string into multiple lines with up to $max_length characters each
wrapped_echo() {
    local input="$1"
    local length=${#input}
    local start=0
    local end=0
    local terminal_width=$(tput cols)
    local max_length=$((terminal_width - 5))  # Adjust as needed
    while [ $((end + max_length)) -lt $length ]; do
        end=$((start + max_length))
        # Find the last space within the substring
        last_space_index=$(find_last_space "${input:$start:$max_length}" $((max_length - 1)))
        if [ $last_space_index -eq -1 ]; then
            last_space_index=$max_length
        fi
        echo "${input:$start:$last_space_index}"
        start=$((start + last_space_index + 1))
    done
    echo "${input:$start}"
}

if [ -z "$1" ]; then
    echo [empty]
elif [ ! -e "$1" ]; then
    wrapped_echo "$@"
elif [ -d "$1" ]; then
    echo "Directory: $1" | bat --style=grid --color=always
    tree -C "$1" | head -200
elif file -b "$1" | grep -q "ELF"; then
    readelf -WCa "$1"
elif file -b "$1" | grep -q "text"; then
    bat --color=always "$1"
else
    file -b "$1"
fi