refactor: move hostname plugins to system module and remove basic.rs

Co-authored-by: aider (openai/andrew.openrouter.qwen.qwen3-coder) <aider@aider.chat>

src/meta_plugin/system.rs

@@ -1,4 +1,7 @@
 use anyhow::Result;
+use gethostname::gethostname;
+use local_ip_address::local_ip;
+use dns_lookup::lookup_addr;
 use std::io;
 use std::io::Write;
 use std::env;
@@ -279,3 +282,89 @@ impl MetaPlugin for KeepPidMetaPlugin {
         self.meta_name.clone()
     }
 }
+
+#[derive(Debug, Clone, Default)]
+pub struct HostnameMetaPlugin {
+    meta_name: String,
+}
+
+impl HostnameMetaPlugin {
+    pub fn new() -> HostnameMetaPlugin {
+        HostnameMetaPlugin {
+            meta_name: "hostname".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for HostnameMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        match gethostname().into_string() {
+            Ok(hostname) => Ok(hostname),
+            Err(_) => Ok("unknown".to_string()),
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed for hostname
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct FullHostnameMetaPlugin {
+    meta_name: String,
+}
+
+impl FullHostnameMetaPlugin {
+    pub fn new() -> FullHostnameMetaPlugin {
+        FullHostnameMetaPlugin {
+            meta_name: "full_hostname".to_string(),
+        }
+    }
+}
+
+impl MetaPlugin for FullHostnameMetaPlugin {
+    fn create(&self) -> Result<Box<dyn Write>> {
+        Ok(Box::new(io::sink()))
+    }
+
+    fn finalize(&mut self) -> io::Result<String> {
+        // Try to get the FQDN through reverse DNS lookup
+        match local_ip() {
+            Ok(my_local_ip) => {
+                match lookup_addr(&my_local_ip) {
+                    Ok(hostname) => Ok(hostname),
+                    Err(_) => {
+                        // Fall back to regular hostname if reverse DNS fails
+                        match gethostname().into_string() {
+                            Ok(hostname) => Ok(hostname),
+                            Err(_) => Ok("unknown".to_string()),
+                        }
+                    }
+                }
+            }
+            Err(_) => {
+                // Fall back to regular hostname if we can't get local IP
+                match gethostname().into_string() {
+                    Ok(hostname) => Ok(hostname),
+                    Err(_) => Ok("unknown".to_string()),
+                }
+            }
+        }
+    }
+
+    fn update(&mut self, _data: &[u8]) {
+        // No update needed for full hostname
+    }
+
+    fn meta_name(&mut self) -> String {
+        self.meta_name.clone()
+    }
+}