求助：使用Haxe语言实现文件每行添加递增编号功能

Hey there! Let's tackle this problem—adding line numbers to each line of a text file is a common task, and there are straightforward ways to do it in several popular languages. Here are a few solutions you can pick from based on what you're comfortable with:

Python is perfect for this kind of text manipulation, thanks to its built-in tools. The enumerate() function makes numbering lines a breeze:

# Open the input file and read all lines
with open('input.txt', 'r') as infile:
    lines = infile.readlines()

# Write the numbered lines to a new output file
with open('output.txt', 'w') as outfile:
    for line_num, line_content in enumerate(lines, start=1):
        # Strip trailing newlines to avoid double line breaks, then format and write
        outfile.write(f"{line_num}: {line_content.rstrip()}\n")

How it works: enumerate(lines, start=1) pairs each line with a counter that starts at 1 (instead of the default 0). We use rstrip() to clean up the original line's newline character so we can add our own after formatting.

If you're working in a Unix-like environment (Linux, macOS, WSL), you don't even need to write a full script—use the nl command, which was made for this exact job:

nl -s ": " input.txt > output.txt

Quick breakdown: The -s ": " flag sets the separator between the line number and text to ": " (replacing the default tab). If you want to number empty lines too, add the -ba flag:

nl -ba -s ": " input.txt > output.txt

If you prefer using Node.js for your scripting needs, here's a simple implementation:

const fs = require('fs');

// Read the input file content
fs.readFile('input.txt', 'utf8', (readErr, fileContent) => {
    if (readErr) {
        console.error('Oops, failed to read the file:', readErr);
        return;
    }

    // Split content into lines, number them, then join back into a single string
    const numberedLines = fileContent.split('\n').map((line, index) => {
        // Optional: Skip numbering empty lines (remove the condition to number all lines)
        return line.trim() ? `${index + 1}: ${line}` : '';
    }).join('\n');

    // Write the result to the output file
    fs.writeFile('output.txt', numberedLines, (writeErr) => {
        if (writeErr) {
            console.error('Failed to write the numbered file:', writeErr);
            return;
        }
        console.log('Numbered file created successfully!');
    });
});

内容的提问来源于stack exchange，提问作者had