Avoid using hardcoded Xtensa Rust version

Cargo.toml

@@ -35,6 +35,7 @@ directories-next = "2.0.0"
 serde = { version = "1.0.146", features = ["derive"] }
 miette = "5.4.1"
 regex = "1.6.0"
+serde_json = "1.0.87"
 
 [target.aarch64-unknown-linux-gnu.dependencies]
 openssl = { version = "0.10", features = ["vendored"] }

src/config.rs

@@ -35,7 +35,7 @@ impl Config {
         let dirs = ProjectDirs::from("rs", "esp", "espup").unwrap();
         let file = dirs.config_dir().join("espup.toml");
 
-        let config = if let Ok(data) = read(&file) {
+        let config = if let Ok(data) = read(file) {
             toml::from_slice(&data).into_diagnostic()?
         } else {
             return Err(ErrReport::msg("No config file found"));

src/main.rs

@@ -21,7 +21,6 @@ use espup::{
     },
 };
 use log::{debug, info, warn};
-use regex::Regex;
 use std::{
     collections::HashSet,
     fs::{remove_dir_all, remove_file, File},
@@ -33,10 +32,6 @@ use std::{
 const DEFAULT_EXPORT_FILE: &str = "export-esp.ps1";
 #[cfg(not(windows))]
 const DEFAULT_EXPORT_FILE: &str = "export-esp.sh";
-/// Xtensa Rust Toolchain version regex.
-const RE_TOOLCHAIN_VERSION: &str = r"^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)\.(?P<subpatch>0|[1-9]\d*)?$";
-/// Latest Xtensa Rust Toolchain version.
-const LATEST_TOOLCHAIN_VERSION: &str = "1.65.0.0";
 
 #[derive(Parser)]
 #[command(
@@ -103,8 +98,8 @@ pub struct InstallOpts {
     #[arg(short = 't', long, default_value = "all")]
     pub targets: String,
     /// Xtensa Rust toolchain version.
-    #[arg(short = 'v', long, default_value = LATEST_TOOLCHAIN_VERSION, value_parser = parse_version)]
-    pub toolchain_version: String,
+    #[arg(short = 'v', long, value_parser = XtensaRust::parse_version)]
+    pub toolchain_version: Option<String>,
 }
 
 #[derive(Debug, Parser)]
@@ -116,7 +111,7 @@ pub struct UpdateOpts {
     #[arg(short = 'l', long, default_value = "info", value_parser = ["debug", "info", "warn", "error"])]
     pub log_level: String,
     /// Xtensa Rust toolchain version.
-    #[arg(short = 'v', long, default_value = LATEST_TOOLCHAIN_VERSION, value_parser = parse_version)]
+    #[arg(short = 'v', long, value_parser = XtensaRust::parse_version)]
     pub toolchain_version: Option<String>,
 }
 
@@ -127,18 +122,6 @@ pub struct UninstallOpts {
     pub log_level: String,
 }
 
-/// Parses the version of the Xtensa toolchain.
-fn parse_version(arg: &str) -> Result<String> {
-    let re = Regex::new(RE_TOOLCHAIN_VERSION).unwrap();
-    if !re.is_match(arg) {
-        bail!(
-                "{} Invalid toolchain version, must be in the form of '<major>.<minor>.<patch>.<subpatch>'",
-                emoji::ERROR
-            );
-    }
-    Ok(arg.to_string())
-}
-
 /// Installs the Rust for ESP chips environment
 fn install(args: InstallOpts) -> Result<()> {
     initialize_logger(&args.log_level);
@@ -153,7 +136,13 @@ fn install(args: InstallOpts) -> Result<()> {
         || targets.contains(&Target::ESP32S2)
         || targets.contains(&Target::ESP32S3)
     {
-        Some(XtensaRust::new(&args.toolchain_version, &host_triple))
+        let xtensa_rust: XtensaRust = if let Some(toolchain_version) = &args.toolchain_version {
+            XtensaRust::new(toolchain_version, &host_triple)
+        } else {
+            let latest_version = XtensaRust::get_latest_version()?;
+            XtensaRust::new(&latest_version, &host_triple)
+        };
+        Some(xtensa_rust)
     } else {
         None
     };
@@ -308,12 +297,12 @@ fn update(args: UpdateOpts) -> Result<()> {
     info!("{} Updating ESP Rust environment", emoji::DISC);
     let host_triple = get_host_triple(args.default_host)?;
     let mut config = Config::load().unwrap();
-    let xtensa_rust: XtensaRust;
-    if let Some(toolchain_version) = args.toolchain_version {
-        xtensa_rust = XtensaRust::new(&toolchain_version, &host_triple);
+    let xtensa_rust: XtensaRust = if let Some(toolchain_version) = args.toolchain_version {
+        XtensaRust::new(&toolchain_version, &host_triple)
     } else {
-        xtensa_rust = XtensaRust::new(LATEST_TOOLCHAIN_VERSION, &host_triple);
-    }
+        let latest_version = XtensaRust::get_latest_version()?;
+        XtensaRust::new(&latest_version, &host_triple)
+    };
 
     debug!(
         "{} Arguments:

src/toolchain/rust.rs

@@ -9,13 +9,20 @@ use crate::{
 };
 use anyhow::{bail, Result};
 use embuild::cmd;
-use log::{info, warn};
+use log::{debug, info, warn};
+use regex::Regex;
+use reqwest::header;
 use serde::{Deserialize, Serialize};
 use std::fmt::Debug;
 use std::{env, fs::remove_dir_all, path::PathBuf, process::Stdio};
 
+/// Xtensa Rust Toolchain repository
 const DEFAULT_XTENSA_RUST_REPOSITORY: &str =
     "https://github.com/esp-rs/rust-build/releases/download";
+/// Xtensa Rust Toolchain API URL
+const XTENSA_RUST_API_URL: &str = "https://api.github.com/repos/esp-rs/rust-build/releases/latest";
+/// Xtensa Rust Toolchain version regex.
+const RE_TOOLCHAIN_VERSION: &str = r"^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)\.(?P<subpatch>0|[1-9]\d*)?$";
 
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct XtensaRust {
@@ -42,6 +49,30 @@ pub struct XtensaRust {
 }
 
 impl XtensaRust {
+    /// Get the latest version of Xtensa Rust toolchain.
+    pub fn get_latest_version() -> Result<String> {
+        let mut headers = header::HeaderMap::new();
+        headers.insert("Accept", "application/vnd.github.v3+json".parse().unwrap());
+
+        let client = reqwest::blocking::Client::builder()
+            .redirect(reqwest::redirect::Policy::none())
+            .user_agent("foo")
+            .build()
+            .unwrap();
+        let res = client
+            .get(XTENSA_RUST_API_URL)
+            .headers(headers)
+            .send()?
+            .text()?;
+        let json: serde_json::Value = serde_json::from_str(&res)?;
+        let mut version = json["tag_name"].to_string();
+
+        version.retain(|c| c != 'v' && c != '"');
+        Self::parse_version(&version)?;
+        debug!("{} Latest Xtensa Rust version: {}", emoji::DEBUG, version);
+        Ok(version)
+    }
+
     /// Installs the Xtensa Rust toolchain.
     pub fn install(&self) -> Result<()> {
         #[cfg(unix)]
@@ -148,6 +179,19 @@ impl XtensaRust {
         }
     }
 
+    /// Parses the version of the Xtensa toolchain.
+    pub fn parse_version(arg: &str) -> Result<String> {
+        debug!("{} Parsing Xtensa Rust version: {}", emoji::DEBUG, arg);
+        let re = Regex::new(RE_TOOLCHAIN_VERSION).unwrap();
+        if !re.is_match(arg) {
+            bail!(
+                "{} Invalid toolchain version, must be in the form of '<major>.<minor>.<patch>.<subpatch>'",
+                emoji::ERROR
+            );
+        }
+        Ok(arg.to_string())
+    }
+
     /// Removes the Xtensa Rust toolchain.
     pub fn uninstall(&self) -> Result<()> {
         info!("{} Uninstalling Xtensa Rust toolchain", emoji::WRENCH);
@@ -264,3 +308,19 @@ fn install_rust_nightly(version: &str) -> Result<()> {
     .run()?;
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::toolchain::rust::XtensaRust;
+
+    #[test]
+    fn test_xtensa_rust_parse_version() {
+        assert_eq!(XtensaRust::parse_version("1.45.0.0").unwrap(), "1.45.0.0");
+        assert_eq!(XtensaRust::parse_version("1.45.0.1").unwrap(), "1.45.0.1");
+        assert_eq!(XtensaRust::parse_version("1.1.1.1").unwrap(), "1.1.1.1");
+        assert!(XtensaRust::parse_version("a.1.1.1").is_err());
+        assert!(XtensaRust::parse_version("1.1.1.1.1").is_err());
+        assert!(XtensaRust::parse_version("1..1.1").is_err());
+        assert!(XtensaRust::parse_version("1._.*.1").is_err());
+    }
+}