martin 1.15.0

Blazing fast and lightweight tile server with PostGIS, MBTiles, and PMTiles support
Documentation 
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//! Failures from parsing and reconciling command-line arguments.
//!
//! Produced only by [`config::args`](crate::config::args), consumed only by `main`.

use std::fmt::Write as _;

/// A convenience [`Result`] for command-line argument handling.
pub type ArgsResult<T> = Result<T, ArgsError>;

/// Why the given command-line arguments could not be turned into a config.
#[derive(thiserror::Error, Debug)]
pub enum ArgsError {
    #[error("The --config and the connection parameters cannot be used together. Please remove unsupported parameters '{}'", elide_vec(.0, 3, 15))]
    ConfigAndConnections(Vec<String>),

    #[error("Unrecognizable connection strings: {0:?}")]
    UnrecognizableConnections(Vec<String>),
}

fn elide_vec(vec: &[String], max_items: usize, max_len: usize) -> String {
    let mut s = String::new();
    for (i, v) in vec.iter().enumerate() {
        if i > max_items {
            let _ = write!(s, " and {} more", vec.len() - i);
            break;
        }
        if i > 0 {
            s.push(' ');
        }
        if v.len() > max_len {
            let mut bytes = 0usize;
            s.extend(v.chars().take_while(|c| {
                bytes += c.len_utf8();
                bytes <= max_len
            }));
            s.push('…');
        } else {
            s.push_str(v);
        }
    }
    s
}