* Print a string as an error(Red). */

* Print a string as an info(Gray). */

* Initialize the terminal and print a string that has color codes embedded in it. */

* Print a string as a warning(Yellow). */

* Get the first API key from api_keys. * @return The API key, could be an empty string. */

* Print a string with a color. */

* Read a file to a string. * @param path Path to the file. * @throw file::file_error If the file cannot be opened or read. * @return Fi

Nothing to do

* Write a string to a file. * @param content The string to write. * @param path Path to the file. * @throw file::file_error If the file

Convert 24bits and 8bits to 4bits

* Check if the json object has an error object, if so, print the error message and set the status. * @param json_to_check The json object to chec

* Calculate the display length of a string, i.e. the number of columns it occupies on the terminal. * Some characters occupy 2 columns, e.g. Chinese

Convert 24bits to 8bits

* Get multiple lines of input from the user. * Press Ctrl + N to enter a new line. * Note: Remember to do error handling by catching std::ex

* Print a string gradually changing colors. * @param colors The colors to interpolate between. * @param by_line Whether to print the color c

* Converts a vector of char into a string. */

* Set the API key, will clear all previous keys. */

* Split a text into chunks. * @param text The text to split. * @param tokens_per_chunk The maximum number of tokens per chunk, tokenizer is

* Construct long-term memory reference for general chatting. * @return The constructed initial prompt. */

* Get embeddings for a list of text. * @param texts The texts to get embeddings for. * @param api_key The API key to use. * @param key_

* @throw std::exception If an error occurred when loading the documents. */

* Calculate a gradual change of colors. * @param colors The colors to interpolate between, * the size of the vector must be greater than 1,

* Print a string with a color and a new line. */

* Convert the Document object to a json object. * @return A json object containing "text" and "embeddings" fields. */

* Call the OpenAI API with a custom lambda function as callback. */

* Call the OpenAI API. * Note: Blocking IO operation. * @throw std::exception When an error occurred. */