feat: add embassy-release tool

* Print dependencies of a crate
* Bump version in dependent crates
* Release using cargo release
* Config file to control features and target

3 files changed, 316 insertions, 0 deletions

diff --git a/embassy-release/Cargo.toml b/embassy-release/Cargo.toml
new file mode 100644
index 000000000..de548e650
--- /dev/null
+++ b/embassy-release/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "embassy-release"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.1", features = ["derive"] }
+walkdir = "2.5.0"
+toml = "0.8.8"
+toml_edit = { version = "0.23.1", features = ["serde"] }
+serde = { version = "1.0.198", features = ["derive"] }
+regex = "1.10.4"
diff --git a/embassy-release/src/main.rs b/embassy-release/src/main.rs
new file mode 100644
index 000000000..321d3872c
--- /dev/null
+++ b/embassy-release/src/main.rs
@@ -0,0 +1,303 @@
+use std::collections::{HashMap, HashSet};
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::Command as ProcessCommand;
+
+use clap::{Parser, Subcommand, ValueEnum};
+use regex::Regex;
+use serde::Deserialize;
+use toml_edit::{DocumentMut, Item, Value};
+use walkdir::WalkDir;
+
+/// Tool to traverse and operate on intra-repo Rust crate dependencies
+#[derive(Parser, Debug)]
+#[command(author, version, about)]
+struct Args {
+    /// Path to the root crate
+    #[arg(value_name = "CRATE_PATH")]
+    crate_path: PathBuf,
+
+    /// Command to perform on each crate
+    #[command(subcommand)]
+    command: Command,
+
+    /// Traversal order
+    #[arg(short, long, default_value = "post")]
+    order: TraversalOrder,
+}
+
+#[derive(Debug, Clone, ValueEnum, PartialEq)]
+enum TraversalOrder {
+    Pre,
+    Post,
+}
+
+#[derive(Debug, Subcommand)]
+enum Command {
+    /// Print all dependencies
+    Dependencies,
+
+    /// Release crate
+    Release {
+        #[command(subcommand)]
+        kind: ReleaseKind,
+    },
+}
+
+#[derive(Debug, Subcommand, Clone, Copy, PartialEq)]
+enum ReleaseKind {
+    Patch,
+    Minor,
+}
+
+#[derive(Debug, Deserialize)]
+struct CargoToml {
+    package: Option<Package>,
+    dependencies: Option<Deps>,
+}
+
+#[derive(Debug, Deserialize)]
+struct Package {
+    name: String,
+    version: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(untagged)]
+enum Dep {
+    Version(String),
+    DetailedTable(HashMap<String, toml::Value>),
+}
+
+type Deps = std::collections::HashMap<String, Dep>;
+
+#[derive(Debug, Deserialize)]
+struct CrateConfig {
+    features: Option<Vec<String>>,
+    target: Option<String>,
+}
+
+type ReleaseConfig = HashMap<String, CrateConfig>;
+
+fn find_path_deps(cargo_path: &Path) -> Vec<PathBuf> {
+    let content = fs::read_to_string(cargo_path).unwrap_or_else(|_| {
+        panic!("Failed to read {:?}", cargo_path);
+    });
+    let parsed: CargoToml = toml::from_str(&content).unwrap_or_else(|e| {
+        panic!("Failed to parse {:?}: {}", cargo_path, e);
+    });
+
+    let mut paths = vec![];
+    if let Some(deps) = parsed.dependencies {
+        for (_name, dep) in deps {
+            match dep {
+                Dep::Version(_) => {
+                    // External dependency — skip
+                }
+                Dep::DetailedTable(table) => {
+                    if let Some(toml::Value::String(path)) = table.get("path") {
+                        let dep_path = cargo_path.parent().unwrap().join(path).canonicalize().unwrap();
+                        paths.push(dep_path);
+                    }
+                }
+            }
+        }
+    }
+
+    paths
+}
+
+fn visit_recursive(
+    root_crate: &Path,
+    visited: &mut HashSet<PathBuf>,
+    output: &mut Vec<PathBuf>,
+    order: &TraversalOrder,
+) {
+    if !visited.insert(root_crate.to_path_buf()) {
+        return;
+    }
+
+    let cargo_toml = root_crate.join("Cargo.toml");
+    let deps = find_path_deps(&cargo_toml);
+
+    if *order == TraversalOrder::Pre {
+        output.push(root_crate.to_path_buf());
+    }
+
+    let mut deps_sorted = deps;
+    deps_sorted.sort();
+    for dep in deps_sorted {
+        visit_recursive(&dep, visited, output, order);
+    }
+
+    if *order == TraversalOrder::Post {
+        output.push(root_crate.to_path_buf());
+    }
+}
+
+fn get_crate_metadata(crate_path: &Path) -> Option<(String, String)> {
+    let cargo_toml = crate_path.join("Cargo.toml");
+    let content = fs::read_to_string(&cargo_toml).ok()?;
+    let parsed: CargoToml = toml::from_str(&content).ok()?;
+    let pkg = parsed.package?;
+    let name = pkg.name;
+    let version = pkg.version?;
+    Some((name, version))
+}
+
+fn load_release_config() -> ReleaseConfig {
+    let config_path = PathBuf::from("release/config.toml");
+    if !config_path.exists() {
+        return HashMap::new();
+    }
+    let content = fs::read_to_string(&config_path).expect("Failed to read release/config.toml");
+    toml::from_str(&content).expect("Invalid TOML format in release/config.toml")
+}
+
+fn bump_dependency_versions(crate_name: &str, new_version: &str) -> Result<(), String> {
+    let mut cargo_files: Vec<PathBuf> = WalkDir::new(".")
+        .into_iter()
+        .filter_map(Result::ok)
+        .filter(|e| e.file_name() == "Cargo.toml")
+        .map(|e| e.into_path())
+        .collect();
+
+    cargo_files.sort();
+
+    for path in cargo_files {
+        let content = fs::read_to_string(&path).map_err(|e| format!("Failed to read {}: {}", path.display(), e))?;
+
+        let mut doc: DocumentMut = content
+            .parse()
+            .map_err(|e| format!("Failed to parse TOML in {}: {}", path.display(), e))?;
+
+        let mut changed = false;
+
+        for section in ["dependencies", "dev-dependencies", "build-dependencies"] {
+            if let Some(Item::Table(dep_table)) = doc.get_mut(section) {
+                if let Some(item) = dep_table.get_mut(crate_name) {
+                    match item {
+                        // e.g., foo = "0.1.0"
+                        Item::Value(Value::String(_)) => {
+                            *item = Item::Value(Value::from(new_version));
+                            changed = true;
+                        }
+                        // e.g., foo = { version = "...", ... }
+                        Item::Value(Value::InlineTable(inline)) => {
+                            if inline.contains_key("version") {
+                                inline["version"] = Value::from(new_version);
+                                changed = true;
+                            }
+                        }
+                        _ => {} // Leave unusual formats untouched
+                    }
+                }
+            }
+        }
+
+        if changed {
+            fs::write(&path, doc.to_string()).map_err(|e| format!("Failed to write {}: {}", path.display(), e))?;
+            println!("🔧 Updated {} to {} in {}", crate_name, new_version, path.display());
+        }
+    }
+
+    Ok(())
+}
+
+fn run_release_command(
+    crate_path: &Path,
+    crate_name: &str,
+    version: &str,
+    kind: &ReleaseKind,
+    config: Option<&CrateConfig>,
+) -> Result<(), String> {
+    let kind_str = match kind {
+        ReleaseKind::Patch => "patch",
+        ReleaseKind::Minor => "minor",
+    };
+
+    if *kind == ReleaseKind::Minor {
+        bump_dependency_versions(crate_name, version)?;
+    }
+
+    let mut args: Vec<String> = vec!["release".into(), kind_str.into()];
+
+    if let Some(cfg) = config {
+        if let Some(features) = &cfg.features {
+            args.push("--features".into());
+            args.push(features.join(","));
+        }
+        if let Some(target) = &cfg.target {
+            args.push("--target".into());
+            args.push(target.clone());
+        }
+    }
+
+    let status = ProcessCommand::new("cargo")
+        .args(&args)
+        .current_dir(crate_path)
+        .status()
+        .map_err(|e| format!("Failed to run cargo release: {}", e))?;
+
+    if !status.success() {
+        return Err(format!("`cargo release {}` failed in crate {}", kind_str, crate_name));
+    }
+
+    //args.push("--execute".into());
+    //let status = ProcessCommand::new("cargo")
+    //    .args(&args)
+    //    .current_dir(crate_path)
+    //    .status()
+    //    .map_err(|e| format!("Failed to run cargo release --execute: {}", e))?;
+
+    //if !status.success() {
+    //    return Err(format!(
+    //        "`cargo release {kind_str} --execute` failed in crate {crate_name}"
+    //    ));
+    //}
+
+    Ok(())
+}
+
+fn main() {
+    let args = Args::parse();
+    let root = args.crate_path.canonicalize().expect("Invalid root crate path");
+
+    match args.command {
+        Command::Dependencies => {
+            let mut visited = HashSet::new();
+            let mut ordered = vec![];
+            visit_recursive(&root, &mut visited, &mut ordered, &args.order);
+            for path in ordered {
+                if let Some((name, _)) = get_crate_metadata(&path) {
+                    println!("{name}");
+                } else {
+                    eprintln!("Warning: could not read crate name from {:?}", path);
+                }
+            }
+        }
+        Command::Release { kind } => {
+            let config = load_release_config();
+            let path = root;
+            match get_crate_metadata(&path) {
+                Some((name, version)) => {
+                    println!("🚀 Releasing {name}...");
+                    let crate_cfg = config.get(&name);
+                    match run_release_command(&path, &name, &version, &kind, crate_cfg) {
+                        Ok(_) => {
+                            println!("✅ Released {name}");
+                        }
+                        Err(e) => {
+                            eprintln!("❌ Error releasing {name}:\n{e}");
+                            eprintln!("\nYou may retry with: `cargo run -- {path:?} release {kind:?}`");
+                            std::process::exit(1);
+                        }
+                    }
+                }
+                None => {
+                    eprintln!("Warning: Could not parse crate metadata in {:?}", path);
+                }
+            }
+        }
+    }
+}
diff --git a/release/config.toml b/release/config.toml
new file mode 100644
index 000000000..2292f4077
--- /dev/null
+++ b/release/config.toml
@@ -0,0 +1 @@
+embassy-rp = { features = ["defmt", "unstable-pac", "time-driver", "rp2040"], target = "thumbv6m-none-eabi" }