rustyroad 1.7.3

Rusty Road is a framework written in Rust that is based on Ruby on Rails. It is designed to provide the familiar conventions and ease of use of Ruby on Rails, while also taking advantage of the performance and efficiency of Rust.
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//! Migration folder naming.

use chrono::Local;
use std::path::Path;

/// Timestamp prefix format shared by every migration folder.
const TIMESTAMP: &str = "%Y%m%d%H%M%S";

/// Returns a migration folder path that does not already exist.
///
/// The prefix has second resolution, so generating two migrations with the same
/// name inside one second would otherwise collide. That happens in practice when a
/// tool retries, so a numeric suffix is appended until the path is free rather than
/// failing the generate.
pub fn folder_for(migrations_dir: &str, name: &str) -> String {
    let timestamp = Local::now().format(TIMESTAMP).to_string();
    let base = format!("{migrations_dir}/{timestamp}-{name}");

    if !Path::new(&base).exists() {
        return base;
    }

    // Keep the `<timestamp>-<name>` shape so directory parsing is unaffected.
    for attempt in 2..1000 {
        let candidate = format!("{migrations_dir}/{timestamp}-{name}_{attempt}");
        if !Path::new(&candidate).exists() {
            return candidate;
        }
    }

    base
}