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//! This module initializes the Mingling local repository workspace.
//!
//! It automatically generates necessary files for development.
use serde_json::Value;
use std::env::current_dir;
use std::fs;
fn main() {
gen_fake_cargo_toml_in_temp_dir();
gen_rust_analyzer_config_for_editors();
}
/// Generate a fake Cargo workspace to prevent temporary repositories under `.temp/`
/// from finding the root directory
fn gen_fake_cargo_toml_in_temp_dir() {
fs::write(
current_dir().unwrap().join(".temp/Cargo.toml"),
"[workspace]",
)
.unwrap();
}
/// Generate Rust Analyzer configuration for editors.
///
/// Copies the editor configuration at `dev/configs/rust-analyzer.json` to each
/// editor's configuration file.
///
/// Supported editors:
/// - `Zed Editor` : ".zed/settings.json"
/// - `VS Code`: ".vscode/settings.json"
fn gen_rust_analyzer_config_for_editors() {
// Re-run this build script whenever the source config changes.
println!("cargo:rerun-if-changed=dev/configs/rust-analyzer.json");
let root = current_dir().unwrap();
let source = root.join("dev/configs/rust-analyzer.json");
let Ok(source_content) = fs::read_to_string(&source) else {
eprintln!(
"warning: `{}` not found, skip editor config generation",
source.display()
);
return;
};
// VS Code uses the same flat `rust-analyzer.*` key format, so copy as-is.
let vscode_path = root.join(".vscode/settings.json");
if ra_settings::write_if_changed(&vscode_path, &source_content) {
eprintln!("generated {}", vscode_path.display());
}
// Zed nests the same settings under `lsp.rust-analyzer.initialization_options`.
let Ok(config) = serde_json::from_str::<Value>(&source_content) else {
eprintln!(
"warning: failed to parse `{}` as JSON, skip Zed config",
source.display()
);
return;
};
let zed_path = root.join(".zed/settings.json");
if ra_settings::write_if_changed(
&zed_path,
&ra_settings::to_pretty_json(&ra_settings::to_zed_settings(&config)),
) {
eprintln!("generated {}", zed_path.display());
}
}
/// Internal helpers for generating editor configuration files.
///
/// This module contains utilities for writing config files only when their
/// contents change, serializing settings in the repo's preferred JSON style,
/// and converting between the flat `rust-analyzer.*` key format used by VS Code
/// and the nested structure expected by the Zed editor.
mod ra_settings {
use std::fs;
use std::path::Path;
use serde::Serialize;
use serde_json::{Map, Value};
/// Write `content` to `path` only when it differs, so editors do not reload
/// unchanged settings files on every build. Returns whether a write happened.
pub fn write_if_changed(path: &Path, content: &str) -> bool {
if fs::read_to_string(path).is_ok_and(|existing| existing == content) {
return false;
}
if let Some(parent) = path.parent() {
fs::create_dir_all(parent).unwrap();
}
fs::write(path, content).unwrap();
true
}
/// Serialize a value as 4-space-indented JSON (matching the repo's hand-written
/// config style), with a trailing newline.
pub fn to_pretty_json(value: &Value) -> String {
let mut buf = Vec::new();
let mut ser = serde_json::Serializer::with_formatter(
&mut buf,
serde_json::ser::PrettyFormatter::with_indent(b" "),
);
value.serialize(&mut ser).unwrap();
String::from_utf8(buf).unwrap() + "\n"
}
/// Convert VSCode-style flat `rust-analyzer.*` keys into the nested
/// `lsp.rust-analyzer.initialization_options` structure that Zed expects.
pub fn to_zed_settings(vscode: &Value) -> Value {
let mut init = Map::new();
let Some(source) = vscode.as_object() else {
return Value::Object(init);
};
let unknown: Vec<&String> = source
.keys()
.filter(|k| !k.starts_with("rust-analyzer."))
.collect();
if !unknown.is_empty() {
eprintln!(
"warning: ignoring non-rust-analyzer keys when generating Zed config: {unknown:?}"
);
}
for (key, value) in source {
if let Some(rest) = key.strip_prefix("rust-analyzer.") {
insert_nested(&mut init, rest, value.clone());
}
}
let mut rust_analyzer = Map::new();
rust_analyzer.insert("initialization_options".into(), Value::Object(init));
let mut lsp = Map::new();
lsp.insert("rust-analyzer".into(), Value::Object(rust_analyzer));
let mut root = Map::new();
root.insert("lsp".into(), Value::Object(lsp));
Value::Object(root)
}
/// Insert `value` at the dotted path `a.b.c` inside `map`, creating any
/// intermediate objects on the way.
fn insert_nested(map: &mut Map<String, Value>, path: &str, value: Value) {
let Some((head, tail)) = path.split_once('.') else {
map.insert(path.to_string(), value);
return;
};
let child = map
.entry(head.to_string())
.or_insert_with(|| Value::Object(Map::new()));
match child {
Value::Object(child) => insert_nested(child, tail, value),
// A scalar already occupies this path; promote it to an object.
_ => {
let mut fresh = Map::new();
insert_nested(&mut fresh, tail, value);
*child = Value::Object(fresh);
}
}
}
}
|
