Function display_text

gopher/src/main.rs:62–202

Display gophermap or text Returns a Command, which may be a Link containing a reference to part of the input data.

(
    data: &'a str,   // The text to display in pages
    title: &str,     // A short document title
    gophermap: bool  // True if data should consist of links
)

/// Returns a Command, which may be a Link containing a reference
/// to part of the input data.
fn display_text<'a>(
    data: &'a str,   // The text to display in pages
    title: &str,     // A short document title
    gophermap: bool  // True if data should consist of links
) -> Command<'a> {
    let lines_per_page = 24; // Last line for status
    let lines_paginate = 20; // How many lines to move each page
    
    // Split data into lines
    let lines = data.lines().collect::<Vec<&str>>();
    let mut start_line = 0; // First line to display
    loop {
        let end_line = if start_line + lines_per_page > lines.len() {lines.len()} else {
            start_line + lines_per_page
        };

        // Links shown on the page
        let mut links: Vec<&str> = Vec::new();

        // Draw the page
        if gophermap {
            // Indent lines, add numbers, type to links
            for line in
                (&lines[start_line..end_line])
                .iter() {
                    // First character determines type
                    match line.chars().nth(0) {
                        Some('i') => {
                            // Print text up to the first tab
                            println!("      {}", line[1..].split('\t').next().unwrap_or(""));
                        }
                        Some('0') => {
                            // Text file
                            print!("{}-TXT ", links.len());
                            links.push(line);
                            println!("{}", line[1..].split('\t').next().unwrap_or(""));
                        }
                        Some('1') => {
                            // Gopher menu
                            print!("{}-DIR ", links.len());
                            links.push(line);
                            println!("{}", line[1..].split('\t').next().unwrap_or(""));
                        }
                        Some(_) => {
                            println!("{:?}", line);
                        }
                        None => {
                        }
                    }
                }
        } else {
            // A text file, no links. Just print lines and line number at the end
            for line in (&lines[start_line..end_line]).iter() {
                println!("{}", line);
            }
            println!("Line {}-{}/{} ---- {} ----", start_line, end_line, lines.len(), title);
        }