打印光标前后的字符

我需要一个 zle 函数来打印光标前后的字符。

print-char-before-after() {
    # Get the position of the cursor
    local cursor_pos=$CURSOR

    # Get the text in the current line
    local line_text=${BUFFER}
}

# Bind the function to a key combination (for example, Ctrl+P)
zle -N print-char-before-after
bindkey '^P' print-char-before-after

假设管道是光标，如果输入是：

This is a inp|ut

输出将是pu

它需要在行首和行末以及多行缓冲区上进行工作。

如果输入是：

|This is a input

输出将是T

如果输入是：

This is a input|

输出将是t

我怎样才能做到这一点？

更新 1：

解决我的问题的代码是：

print-char-before-after() {
    # Get the characters from the left and right buffers
    local before_char=""
    local after_char=""

    # Check if the cursor is not at the beginning of the line
    if [[ -n "$LBUFFER" ]]; then
        before_char=${LBUFFER[-1]} # Last character of LBUFFER
    fi

    # Check if the cursor is not at the end of the line
    if [[ -n "$RBUFFER" ]]; then
        after_char=${RBUFFER[1]} # First character of RBUFFER
    fi

    # Print the characters before and after
    echo "${before_char}${after_char}"
}

# Bind the function to a key combination (for example, Ctrl+P)
zle -N print-char-before-after
bindkey '^P' print-char-before-after