cargo-espflash 0.1.3

Cargo subcommand for flashing the ESP8266 and ESP32 over serial
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use serde::Deserialize;
use std::fs;
use std::path::{Path, PathBuf};

#[derive(Debug, Deserialize)]
struct CargoConfig {
    #[serde(default)]
    unstable: Unstable,
}

#[derive(Debug, Default, Deserialize)]
#[serde(rename_all = "kebab-case")]
struct Unstable {
    #[serde(default)]
    build_std: Vec<String>,
}

/// Check if the build-std option seems to be set correctly
pub fn has_build_std<P: AsRef<Path>>(project_path: P) -> bool {
    let config_path = match config_path(project_path.as_ref()) {
        Some(path) => path,
        None => {
            return false;
        }
    };
    let content = match fs::read(&config_path) {
        Ok(content) => content,
        Err(_) => return false,
    };
    let toml: CargoConfig = match toml::from_slice(&content) {
        Ok(toml) => toml,
        Err(_) => return false,
    };
    toml.unstable
        .build_std
        .iter()
        .any(|option| option == "core")
}

fn config_path(project_path: &Path) -> Option<PathBuf> {
    let bare = project_path.join(".cargo/config");
    if bare.exists() {
        return Some(bare);
    }
    let toml = project_path.join(".cargo/config.toml");
    if toml.exists() {
        Some(toml)
    } else {
        None
    }
}