cargo-expand 1.0.121

Wrapper around rustc -Zunpretty=expanded. Shows the result of macro expansion and #[derive] expansion.
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use serde::Deserialize;
use std::env;
use std::io::{self, Write};
use std::path::PathBuf;

#[derive(Deserialize)]
struct Sections {
    #[serde(default)]
    expand: Config,
}

#[derive(Deserialize, Default)]
pub struct Config {
    pub theme: Option<String>,
    pub color: Option<String>,
    #[serde(default)]
    pub pager: bool,
    /// Format using rustfmt instead of prettyplease. This is significantly
    /// slower, and less reliable on macro-generated code, but produces more
    /// aesthetic formatting when it works.
    #[serde(default)]
    pub rustfmt: bool,
}

pub fn deserialize() -> Config {
    try_deserialize().unwrap_or_default()
}

fn try_deserialize() -> Option<Config> {
    let cargo_home = env::var_os("CARGO_HOME").map(PathBuf::from)?;
    let config_names = ["config", "config.toml"];
    let config_path = config_names
        .iter()
        .map(|name| cargo_home.join(name))
        .find(|path| path.exists())?;

    let content = fs_err::read_to_string(&config_path).ok()?;

    let full_config: Sections = match toml::from_str(&content) {
        Ok(config) => config,
        Err(err) => {
            let _ = writeln!(io::stderr(), "Warning: {}: {}", config_path.display(), err);
            return None;
        }
    };

    Some(full_config.expand)
}