cargo-inspect 0.10.3

use std::error::Error;
use std::path::PathBuf;
use structopt::StructOpt;

fn parse_tuple<T>(s: &str) -> Result<(T, T), Box<dyn Error>>
where
    T: std::str::FromStr,
    T::Err: Error + 'static,
{
    let pos = s.find(',').ok_or_else(|| {
        format!(
            "Expected format: file1.rs,file2.rs. No `,` found in `{}`",
            s
        )
    })?;
    Ok((s[..pos].parse()?, s[pos + 1..].parse()?))
}

/// Holds all configuration options when using
/// cargo-inspect as a library.
#[derive(StructOpt, Debug)]
pub struct Config {
    /// Input file
    #[structopt(name = "INPUT_FILE", parse(from_os_str))]
    pub input: Option<PathBuf>,

    /// Diff input files
    #[structopt(long = "diff", parse(try_from_str = parse_tuple))]
    pub files: Option<(String, String)>,

    /// rustc "unpretty" parameters
    ///
    /// *Note*: For `--unpretty=flowgraph=[symbol]` you need to have `dot` on your PATH.
    #[structopt(long = "unpretty", default_value = "hir")]
    pub unpretty: String,

    /// Override for the format that gets outputted when the `unpretty` mode
    /// is set to `flowgraph`
    #[structopt(long = "format", default_value = "svg")]
    pub format: String,

    /// Print the original code as a comment above the desugared code
    #[structopt(short = "v", long = "verbose")]
    pub verbose: bool,

    /// Don't highlight output
    #[structopt(long = "plain")]
    pub plain: bool,

    /// Specify a theme override for the pretty printer
    #[structopt(name = "THEME", long = "theme")]
    pub theme: Option<String>,

    /// Should we list all pretty printer themes?
    #[structopt(long = "list-themes")]
    pub list_themes: bool,
}

/// The structopt enum, which serves as an adapter so that the config options
/// can be passed to cargo-inspect via cargo
#[derive(StructOpt, Debug)]
#[structopt(bin_name = "cargo")]
pub enum Opt {
    #[structopt(name = "inspect")]
    /// This extends Cargo to allow you to desugar your Rust code and see what
    /// happens behind the curtains.
    Config(Config),
}