symlink support

src/config.rs

@@ -8,6 +8,8 @@ use thiserror::Error;
 
 #[derive(Debug, Deserialize)]
 pub struct GaltonConfig {
+    #[serde(default)]
+    pub watch: WatchConfig,
     #[serde(default)]
     pub rule: Vec<Rule>,
 }
@@ -26,15 +28,26 @@ impl GaltonConfig {
     }
 }
 
-fn normalize_path(path: String) -> String {
-    if let Some(suffix) = path.strip_prefix("~/") {
+#[derive(Debug, Deserialize, Default)]
+pub struct WatchConfig {
+    symlink: Option<String>,
+}
+
+impl WatchConfig {
+    pub fn symlink(&self) -> Option<String> {
+        self.symlink.as_deref().map(normalize_path)
+    }
+}
+
+fn normalize_path<P: Into<String> + AsRef<str>>(path: P) -> String {
+    if let Some(suffix) = path.as_ref().strip_prefix("~/") {
         let home = home_dir().unwrap_or_default();
         home.join(suffix)
             .into_os_string()
             .into_string()
             .expect("non utf8 home directory")
     } else {
-        path
+        path.into()
     }
 }
 

src/main.rs

@@ -10,6 +10,7 @@ use notify_debouncer_full::notify::{EventKind, RecursiveMode};
 use notify_debouncer_full::{new_debouncer, DebounceEventResult};
 use std::fs::{copy, create_dir_all, remove_file, rename};
 use std::io::ErrorKind;
+use std::os::unix::fs::symlink;
 use std::path::{Path, PathBuf};
 use std::sync::mpsc::channel;
 use std::thread::sleep;
@@ -66,6 +67,7 @@ fn main() -> MainResult {
         }
         Commands::Watch { path, recursive } => {
             let rules = config.rule;
+            let symlink = config.watch.symlink();
             let (tx, rx) = channel();
             let mut watcher = new_debouncer(Duration::from_secs(1), None, tx)?;
             watcher.watch(
@@ -84,7 +86,7 @@ fn main() -> MainResult {
                 }
             })?;
             for res in rx {
-                handle_watch_events(res, &rules);
+                handle_watch_event(res, &rules, symlink.as_deref());
             }
         }
     }
@@ -92,7 +94,7 @@ fn main() -> MainResult {
     Ok(())
 }
 
-fn handle_watch_events(result: DebounceEventResult, rules: &[Rule]) {
+fn handle_watch_event(result: DebounceEventResult, rules: &[Rule], link_target: Option<&str>) {
     match result {
         Ok(events) => {
             for event in events {
@@ -103,7 +105,22 @@ fn handle_watch_events(result: DebounceEventResult, rules: &[Rule]) {
                         sleep(Duration::from_millis(200));
                         match FileInfo::load(path) {
                             Ok(file) => {
-                                handle_file(&file, rules);
+                                if let Some(target) = handle_file(&file, rules) {
+                                    if let Some(link_target) = link_target {
+                                        match symlink(&target, link_target) {
+                                            Ok(()) => {
+                                                info!(
+                                                    to = target,
+                                                    from = link_target,
+                                                    "created symlink"
+                                                );
+                                            }
+                                            Err(error) => {
+                                                error!(%error, "failed to link target");
+                                            }
+                                        }
+                                    }
+                                }
                             }
                             Err(error) => {
                                 error!(%error, "failed to load file info");
@@ -132,10 +149,10 @@ fn match_file(file: &FileInfo, rules: &[Rule]) -> Option<RuleMatch> {
 }
 
 #[instrument(skip_all, fields(file = file.path))]
-fn handle_file(file: &FileInfo, rules: &[Rule]) {
+fn handle_file(file: &FileInfo, rules: &[Rule]) -> Option<String> {
     let Some(result) = match_file(file, rules) else {
         info!("no matches");
-        return;
+        return None;
     };
 
     let parent = result.target.as_deref().unwrap_or_else(|| file.parent());
@@ -143,7 +160,7 @@ fn handle_file(file: &FileInfo, rules: &[Rule]) {
 
     if let Err(error) = create_dir_all(parent) {
         error!(%error, "failed to create target directory");
-        return;
+        return None;
     }
 
     let target = format!("{parent}/{name}");
@@ -151,9 +168,11 @@ fn handle_file(file: &FileInfo, rules: &[Rule]) {
     match cross_storage_move(&file.path, &target) {
         Ok(()) => {
             info!(target, "moved file");
+            Some(target)
         }
         Err(error) => {
             info!(target, ?error, "failed to moved file");
+            None
         }
     }
 }