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use anyhow::Result;
use serde_json::Value as JsonValue;
use std::{
collections::{HashMap, HashSet},
env, fs,
process::Command,
};
use toml::value::{Table, Value as TomlValue};
use semver::Version;
fn main() -> Result<()> {
// Build a TOML table as cache
let mut out_tbl: Table = Table::new();
// Try to read Cargo.toml package and dependencies
if let Ok(s) = fs::read_to_string("Cargo.toml") {
if let Ok(v) = toml::from_str::<toml::Value>(&s) {
if let Some(pkg) = v.get("package") {
if let Some(t) = pkg.as_table() {
let mut pj = Table::new();
if let Some(n) = t.get("name").and_then(|x| x.as_str()) {
pj.insert("name".to_string(), TomlValue::String(n.to_string()));
}
if let Some(vv) = t.get("version").and_then(|x| x.as_str()) {
pj.insert("version".to_string(), TomlValue::String(vv.to_string()));
}
if let Some(repo) = t.get("repository").and_then(|x| x.as_str()) {
pj.insert(
"repository".to_string(),
TomlValue::String(repo.to_string()),
);
}
if let Some(lic) = t.get("license").and_then(|x| x.as_str()) {
pj.insert("license".to_string(), TomlValue::String(lic.to_string()));
}
if let Some(auth) = t.get("authors").and_then(|x| x.as_array()) {
let arr = auth
.iter()
.filter_map(|a| a.as_str().map(|s| TomlValue::String(s.to_string())))
.collect::<Vec<_>>();
pj.insert("authors".to_string(), TomlValue::Array(arr));
}
out_tbl.insert("package".to_string(), TomlValue::Table(pj));
}
}
if let Some(deps) = v.get("dependencies") {
if let Some(table) = deps.as_table() {
let mut darr = Vec::new();
// collect first-level dependency package names (handle rename via `package` key)
let mut direct_dep_names: Vec<String> = Vec::new();
for (k, val) in table.iter().take(500) {
// Skip local / path dependencies (they are workspace crates and not relevant for external license summary)
if val.is_table() && val.get("path").is_some() {
// skip this dependency entirely
continue;
}
let ver = if val.is_str() {
val.as_str().unwrap_or("").to_string()
} else if val.is_table() {
val.get("version")
.and_then(|x| x.as_str())
.unwrap_or("")
.to_string()
} else {
"".to_string()
};
// determine the actual package name used in registry (if renamed, `package` field holds real name)
let actual_name = if val.is_table() {
val.get("package")
.and_then(|x| x.as_str())
.map(|s| s.to_string())
.unwrap_or(k.to_string())
} else {
k.to_string()
};
direct_dep_names.push(actual_name.clone());
let mut dep_t = Table::new();
dep_t.insert("name".to_string(), TomlValue::String(actual_name.clone()));
if actual_name != k.as_str() {
dep_t.insert("alias".to_string(), TomlValue::String(k.to_string()));
}
dep_t.insert("version".to_string(), TomlValue::String(ver));
darr.push(TomlValue::Table(dep_t));
}
out_tbl.insert("dependencies".to_string(), TomlValue::Array(darr));
// store the direct dependency set in the table so later cargo-metadata handling can use it
let deps_name_arr = direct_dep_names
.into_iter()
.map(TomlValue::String)
.collect::<Vec<_>>();
out_tbl.insert(
"direct_dependency_names".to_string(),
TomlValue::Array(deps_name_arr),
);
}
}
}
}
hydrate_package_metadata_from_env(&mut out_tbl);
// Try cargo metadata for license map (metadata is JSON)
if let Ok(o) = Command::new("cargo")
.args(["metadata", "--format-version", "1"])
.output()
{
if o.status.success() {
if let Ok(jv) = serde_json::from_slice::<JsonValue>(&o.stdout) {
if let Some(pkgs) = jv.get("packages").and_then(|p| p.as_array()) {
// build a set of direct dependency names from the earlier parsed Cargo.toml
let mut direct_set: HashSet<String> = HashSet::new();
if let Some(TomlValue::Array(arr)) = out_tbl.get("direct_dependency_names") {
for v in arr.iter() {
if let TomlValue::String(s) = v {
direct_set.insert(s.clone());
}
}
// remove the helper entry from out_tbl so it won't be part of final file
out_tbl.remove("direct_dependency_names");
}
// for each package name, keep only the entry with the highest semver version
let mut best_map: HashMap<String, (Version, String)> = HashMap::new();
for p in pkgs.iter() {
if let Some(n) = p.get("name").and_then(|x| x.as_str()) {
// only include first-level direct dependencies
if !direct_set.contains(n) {
continue;
}
let lic = p
.get("license")
.and_then(|x| x.as_str())
.unwrap_or("")
.to_string();
let ver_str = p.get("version").and_then(|x| x.as_str()).unwrap_or("");
if let Ok(ver) = Version::parse(ver_str) {
match best_map.get(n) {
Some((existing_ver, _)) => {
if &ver > existing_ver {
best_map.insert(n.to_string(), (ver, lic));
}
}
None => {
best_map.insert(n.to_string(), (ver, lic));
}
}
} else {
// if version cannot be parsed, prefer to insert if missing
best_map
.entry(n.to_string())
.or_insert((Version::new(0, 0, 0), lic));
}
}
}
if let Some(deps_arr) = out_tbl
.get_mut("dependencies")
.and_then(|v| v.as_array_mut())
{
for dep in deps_arr.iter_mut() {
if let TomlValue::Table(dep_tbl) = dep {
if let Some(dep_name) = dep_tbl.get("name").and_then(|x| x.as_str())
{
if let Some((ver, _)) = best_map.get(dep_name) {
dep_tbl.insert(
"version".to_string(),
TomlValue::String(format_version_for_about(ver)),
);
}
}
}
}
}
let mut map_tbl = Table::new();
for (name, (_ver, lic)) in best_map.into_iter() {
// only write a single key per package: `name` -> license
map_tbl.insert(name, TomlValue::String(lic));
}
out_tbl.insert("license_map".to_string(), TomlValue::Table(map_tbl));
}
}
}
}
// write to res/about_cache.toml
let toml_val = TomlValue::Table(out_tbl);
if let Ok(content) = toml::to_string_pretty(&toml_val) {
fs::create_dir_all("res")?;
fs::write("res/about_cache.toml", content)?;
}
Ok(())
}
fn hydrate_package_metadata_from_env(out_tbl: &mut Table) {
let pkg_tbl = match out_tbl.get_mut("package") {
Some(TomlValue::Table(tbl)) => tbl,
_ => {
out_tbl.insert("package".to_string(), TomlValue::Table(Table::new()));
match out_tbl.get_mut("package") {
Some(TomlValue::Table(tbl)) => tbl,
_ => return,
}
}
};
let name = env::var("CARGO_PKG_NAME").unwrap_or_default();
set_string_field_if_missing(pkg_tbl, "name", &name);
let version = env::var("CARGO_PKG_VERSION").unwrap_or_default();
set_string_field_if_missing(pkg_tbl, "version", &version);
let repository = env::var("CARGO_PKG_REPOSITORY").unwrap_or_default();
set_string_field_if_missing(pkg_tbl, "repository", &repository);
let license = env::var("CARGO_PKG_LICENSE").unwrap_or_default();
set_string_field_if_missing(pkg_tbl, "license", &license);
let authors_raw = env::var("CARGO_PKG_AUTHORS").unwrap_or_default();
let authors: Vec<String> = authors_raw
.split(':')
.map(str::trim)
.filter(|entry| !entry.is_empty())
.map(|entry| entry.to_string())
.collect();
if !authors.is_empty() {
let should_set = match pkg_tbl.get("authors") {
Some(TomlValue::Array(existing)) => existing
.iter()
.filter_map(|value| value.as_str())
.all(|value| value.trim().is_empty()),
Some(_) => true,
None => true,
};
if should_set {
let arr = authors
.into_iter()
.map(TomlValue::String)
.collect::<Vec<_>>();
pkg_tbl.insert("authors".to_string(), TomlValue::Array(arr));
}
}
}
fn set_string_field_if_missing(tbl: &mut Table, key: &str, value: &str) {
if value.is_empty() {
return;
}
let should_set = match tbl.get(key) {
Some(TomlValue::String(existing)) => existing.trim().is_empty(),
Some(_) => true,
None => true,
};
if should_set {
tbl.insert(key.to_string(), TomlValue::String(value.to_string()));
}
}
fn format_version_for_about(ver: &Version) -> String {
if ver.major > 0 {
ver.major.to_string()
} else {
format!("0.{}", ver.minor)
}
}