This code snippet processes email messages, extracts their subjects and senders, and generates an HTML list of these details for display.

Run example

npm run import -- "list the subjects from simple-imap messages"

list the subjects from simple-imap messages

htmlPrint = '';
messages.forEach(message => {
    var header = message.parts.filter(function (part) {
        return part.which.indexOf('HEADER') > -1;
    });
    var subject = header[0].body.subject[0];
    var from = header[0].body.from[0];
    htmlPrint += '<li>subject: ' + subject + ', from: ' + from + '</li>\n';
});
$.mime({'text/markdown': 'Usage:\n\n```html\n' + htmlPrint + '\n```\nOuput:\n'});

/**
 * Generate HTML list from email messages and print using Markdown syntax.
 *
 * @param {Object[]} messages - Array of email messages.
 * @return {string} HTML list in Markdown format.
 */
function generateHtmlList(messages) {
    let htmlPrint = '';

    // Use Array.prototype.forEach() for better performance and readability
    messages.forEach((message) => {
        // Filter headers containing 'HEADER' using Array.prototype.reduce()
        const headers = message.parts.reduce((acc, part) => {
            if (part.which.indexOf('HEADER') > -1) {
                acc.push(part);
            }
            return acc;
        }, []);

        // Check if headers exist to avoid index out of bounds error
        if (headers.length > 0) {
            const subject = headers[0].body.subject[0];
            const from = headers[0].body.from[0];
            htmlPrint += `<li>subject: ${subject}, from: ${from}</li>\n`;
        }
    });

    // Return HTML list in Markdown format
    return `Usage:\n\n```html\n${htmlPrint}\n```\nOuput:\n`;
}

// Example usage:
$.mime({
    'text/markdown': generateHtmlList(messages)
});

This code snippet processes an array of email messages (messages) and generates an HTML-formatted list of email subjects and senders.

Here's a breakdown:

1. Initialization:

   • htmlPrint = '';: Initializes an empty string to store the HTML output.

2. Message Processing:

   • messages.forEach(message => { ... });: Iterates through each email message in the messages array.
   • var header = message.parts.filter(function (part) { ... });: Extracts the header part of the email message.
   • var subject = header[0].body.subject[0];: Extracts the subject from the header.
   • var from = header[0].body.from[0];: Extracts the sender from the header.
   • htmlPrint += '<li>subject: ' + subject + ', from: ' + from + '</li>\n';: Appends a list item (<li>) containing the subject and sender to the htmlPrint string.

3. Output Generation:

   • $.mime({'text/markdown': 'Usage:\n\n```html\n' + htmlPrint + '\n```\nOuput:\n'});: Sends the generated HTML code as a MIME response, likely within a larger application framework.

In essence, this code snippet takes an array of email messages, extracts subject and sender information, and formats it as an HTML list for display or further processing.