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//! This example demonstrates a chain of Germ's capabilities by fetching a
//! Gemini capsule, parsing the response content into an abstract syntax tree,
//! and converting the abstract syntax tree back to Gemtext, identical to the
//! Gemini response content.
use std::env;
fn main() {
// Try to obtain a URL from the command line arguments or use the default one
let url_string =
env::args().nth(1).unwrap_or_else(|| "gemini://fuwn.me/".to_string());
// Form a valid URL to a Gemini capsule
let url = match url::Url::parse(&url_string) {
Ok(url) => url,
Err(error) => {
eprintln!("Error parsing URL '{}': {}", url_string, error);
std::process::exit(1);
}
};
// Perform a blocking request to the Gemini capsule
let request = germ::request::blocking::request(&url);
match request {
// If the request was successful:
Ok(response) => {
// Obtain the content of the Gemini response
let response_content =
&*response.content().clone().unwrap_or_else(|| "".to_string());
// Parse the Gemini response content into an abstract syntax tree
let ast = germ::ast::Ast::from_string(response_content);
// Convert the abstract syntax tree back to Gemtext, identical to the
// Gemini response content, constructed from the parsed abstract syntax
// tree
let gemtext = ast.to_gemtext();
// Print the Gemtext
println!("{}", gemtext);
// Check if the response content and reconstruction are identical
if response_content == gemtext {
println!(
"\nValidation: Response content and reconstruction are identical"
);
} else {
println!("\nValidation: Response content and reconstruction differ");
print_diff(response_content, &gemtext);
}
}
// If the request was unsuccessful, print an error message and exit
Err(error) => {
eprintln!("Error fetching '{}': {}", url_string, error);
std::process::exit(1);
}
}
}
fn print_diff(original: &str, reconstructed: &str) {
use std::io::{self, Write};
let mut stdout = io::stdout();
let original_lines = original.lines().collect::<Vec<&str>>();
let reconstructed_lines = reconstructed.lines().collect::<Vec<&str>>();
let max_lines = original_lines.len().max(reconstructed_lines.len());
let mut has_printed_diff = false;
for i in 0..max_lines {
let original_line = original_lines.get(i).unwrap_or(&"");
let reconstructed_line = reconstructed_lines.get(i).unwrap_or(&"");
if original_line != reconstructed_line {
if has_printed_diff {
let _ = writeln!(stdout);
}
let _ = writeln!(stdout, "Line {}:", i + 1);
let _ = writeln!(stdout, " Original: '{}'", original_line);
let _ = writeln!(stdout, " Reconstructed: '{}'", reconstructed_line);
has_printed_diff = true;
}
}
if original_lines.len() != reconstructed_lines.len() {
if has_printed_diff {
let _ = writeln!(stdout);
}
let _ = writeln!(stdout, "Length difference:");
let _ = writeln!(stdout, " Original: {} lines", original_lines.len());
let _ =
writeln!(stdout, " Reconstructed: {} lines", reconstructed_lines.len());
}
}
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