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//! Configuration loading for ix.
//!
//! The daemon discovers `.ixd.toml` files to scope its watch and index
//! behaviour. Each config file specifies which subdirectories to watch
//! and which patterns to exclude.
use crate::Builder;
use serde::{Deserialize, Serialize};
use std::path::{Path, PathBuf};
/// ix runtime configuration, loaded from `.ixd.toml`.
#[derive(Debug, PartialEq, Serialize, Deserialize)]
pub struct Config {
/// Root directories to watch for indexing.
#[serde(default)]
pub watch_roots: Vec<PathBuf>,
/// Glob patterns for paths to exclude from indexing.
#[serde(default)]
pub exclude_patterns: Vec<String>,
/// Debounce interval in milliseconds for file-watch events.
///
/// Minimum 50 ms, maximum 10000 ms (clamped by [`crate::watcher::Watcher::with_debounce`]).
/// `None` uses the default (500 ms).
///
/// # Merged-config precedence
///
/// When [`discover_under`](Self::discover_under) merges multiple `.ixd.toml`
/// files, the **root-level** `debounce_ms` takes precedence over subdirectory
/// configs. Subdirectory `debounce_ms` values are ignored to avoid conflicting
/// timer strategies within a single daemon instance. If you need different
/// debounce intervals per watched subtree, run separate `ixd` instances.
#[serde(default)]
pub debounce_ms: Option<u64>,
}
impl Default for Config {
fn default() -> Self {
Self {
watch_roots: Vec::new(),
// Default exclude patterns for the `.ixd.toml` daemon config.
// The daemon (daemon.rs) reads these and bridges them to both
// Builder (via with_exclude_patterns) and Watcher (via Watcher::new).
// See also: src/lib/builder.rs:226, src/lib/watcher.rs:40
exclude_patterns: vec![
".git".to_string(),
"node_modules".to_string(),
"target".to_string(),
],
debounce_ms: None,
}
}
}
impl Config {
/// Load configuration from a `.ixd.toml` file at the given path.
///
/// # Errors
///
/// Returns an error if the file cannot be read or parsed.
pub fn load(path: &Path) -> crate::error::Result<Self> {
let content = std::fs::read_to_string(path).map_err(|e| {
crate::error::Error::Config(format!("cannot read config file {}: {e}", path.display()))
})?;
toml::from_str(&content).map_err(|e| {
crate::error::Error::Config(format!("cannot parse config file {}: {e}", path.display()))
})
}
/// Discover `.ixd.toml` files under the given root directory by
/// walking up to two levels deep.
///
/// Returns the **merged** configuration: `exclude_patterns` from
/// the root-level config are applied globally; `watch_roots` from
/// each discovered file scope the daemon to those subdirectories.
///
/// # Errors
///
/// Returns an error only if a discovered file cannot be parsed.
/// Missing or absent config files are silently skipped.
pub fn discover_under(root: &Path) -> crate::error::Result<Self> {
let root_config_path = root.join(".ixd.toml");
let mut merged = if root_config_path.exists() {
// Resolve root-level `watch_roots` against `root`. The Builder and
// Watcher compare absolute file paths with `Path::starts_with`, so a
// relative entry (e.g. `watch_roots = ["src"]`) would never match and
// every file would be filtered out, yielding an empty index (audit D1).
let mut cfg = Self::load(&root_config_path)?;
cfg.watch_roots = cfg
.watch_roots
.into_iter()
.map(|wr| if wr.is_absolute() { wr } else { root.join(wr) })
.collect();
cfg
} else {
Self::default()
};
// Walk one level of subdirectories looking for `.ixd.toml`
if let Ok(entries) = std::fs::read_dir(root) {
for entry in entries.flatten() {
let sub_path = entry.path();
if sub_path.is_dir() {
let config_path = sub_path.join(".ixd.toml");
if config_path.exists()
&& let Ok(mut sub_config) = Self::load(&config_path)
{
if !sub_config.watch_roots.is_empty() {
// Resolve subdir `watch_roots` against the subdir (not
// the root) so they survive the absolute-path match
// in Builder/Watcher (audit D1).
sub_config.watch_roots = sub_config
.watch_roots
.into_iter()
.map(|wr| {
if wr.is_absolute() {
wr
} else {
sub_path.join(wr)
}
})
.collect();
merged.watch_roots.extend(sub_config.watch_roots);
}
merged
.exclude_patterns
.extend(sub_config.exclude_patterns.clone());
}
}
}
}
// Deduplicate
merged.watch_roots.sort();
merged.watch_roots.dedup();
merged.exclude_patterns.sort();
merged.exclude_patterns.dedup();
Ok(merged)
}
/// Apply this configuration's `exclude_patterns` and `watch_roots`
/// to a [`Builder`], returning the configured builder.
///
/// This is the single source of truth for wiring config → builder,
/// used by both the CLI (`ix --build`) and the daemon (`ixd`).
/// Ensures `--build` and the daemon scope identically (audit F2).
#[must_use]
pub fn apply_to_builder(&self, mut builder: Builder) -> Builder {
if !self.exclude_patterns.is_empty() {
builder = builder.with_exclude_patterns(self.exclude_patterns.clone());
}
if !self.watch_roots.is_empty() {
builder = builder.with_watch_roots(self.watch_roots.clone());
}
builder
}
}
#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
use super::*;
#[test]
fn test_config_default() {
let config = Config::default();
assert_eq!(
config,
Config {
watch_roots: Vec::new(),
exclude_patterns: vec![
".git".to_string(),
"node_modules".to_string(),
"target".to_string(),
],
debounce_ms: None,
}
);
}
#[test]
fn test_discover_under_resolves_relative_watch_roots() {
// Regression for audit D1: `watch_roots = ["src", "test"]` are written
// relative to the search root. `discover_under` must resolve them to
// absolute paths, otherwise `Builder`/`Watcher` (which compare absolute
// paths with `Path::starts_with`) never match and the index ends up
// empty.
let base = std::env::temp_dir().join(format!("ix_cfg_test_{}", std::process::id()));
let _ = std::fs::create_dir_all(&base);
std::fs::write(
base.join(".ixd.toml"),
"watch_roots = [\"src\", \"test\"]\nexclude_patterns = [\".git\"]\n",
)
.unwrap();
let cfg = Config::discover_under(&base).unwrap();
assert_eq!(cfg.watch_roots.len(), 2);
for wr in &cfg.watch_roots {
assert!(wr.is_absolute(), "watch_root {wr:?} must be absolute");
assert!(
wr.starts_with(&base),
"watch_root {wr:?} must be under the search root"
);
}
assert!(cfg.watch_roots.contains(&base.join("src")));
assert!(cfg.watch_roots.contains(&base.join("test")));
let _ = std::fs::remove_dir_all(&base);
}
}