feat: handle CwdChanged and FileChanged hook events (closes #253)

src-tauri/src/types.rs

@@ -318,6 +318,20 @@ pub struct PostCompactEvent {
     pub conversation_id: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CwdChangedEvent {
+    pub cwd: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct FileChangedEvent {
+    pub file: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AgentStartEvent {
     pub tool_use_id: String,
@@ -741,4 +755,52 @@ mod tests {
         assert!(serialized.contains("\"session_id\":\"sess-xyz\""));
         assert!(!serialized.contains("conversation_id"));
     }
+
+    #[test]
+    fn test_cwd_changed_event_serialization() {
+        let event = CwdChangedEvent {
+            cwd: "/home/naomi/code/my-project".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/home/naomi/code/my-project\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_cwd_changed_event_omits_none_fields() {
+        let event = CwdChangedEvent {
+            cwd: "/tmp/workspace".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cwd\":\"/tmp/workspace\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
+
+    #[test]
+    fn test_file_changed_event_serialization() {
+        let event = FileChangedEvent {
+            file: "/home/naomi/code/my-project/src/main.rs".to_string(),
+            conversation_id: Some("conv-abc".to_string()),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/home/naomi/code/my-project/src/main.rs\""));
+        assert!(serialized.contains("\"conversation_id\":\"conv-abc\""));
+    }
+
+    #[test]
+    fn test_file_changed_event_omits_none_fields() {
+        let event = FileChangedEvent {
+            file: "/tmp/test.txt".to_string(),
+            conversation_id: None,
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"file\":\"/tmp/test.txt\""));
+        assert!(!serialized.contains("conversation_id"));
+    }
 }

src-tauri/src/wsl_bridge.rs

@@ -15,10 +15,10 @@ use crate::process_ext::HideWindow;
 use crate::stats::{calculate_cost, StatsUpdateEvent, UsageStats};
 use crate::types::{
     AgentEndEvent, AgentStartEvent, CharacterState, ClaudeMessage, ConnectionEvent,
-    ConnectionStatus, ContentBlock, ElicitationEvent, ElicitationResultEvent, MessageCost,
+    ConnectionStatus, ContentBlock, CwdChangedEvent, ElicitationEvent, ElicitationResultEvent,
-    OutputEvent, PermissionPromptEvent, PermissionPromptEventItem, QuestionOption, SessionEvent,
+    FileChangedEvent, MessageCost, OutputEvent, PermissionPromptEvent, PermissionPromptEventItem,
-    PostCompactEvent, StateChangeEvent, StopFailureEvent, TodoItem, TodoUpdateEvent,
+    PostCompactEvent, QuestionOption, SessionEvent, StateChangeEvent, StopFailureEvent, TodoItem,
-    UserQuestionEvent, WorkingDirectoryEvent, WorktreeEvent, WorktreeInfo,
+    TodoUpdateEvent, UserQuestionEvent, WorkingDirectoryEvent, WorktreeEvent, WorktreeInfo,
 };
 use parking_lot::RwLock;
 use std::cell::RefCell;
@@ -1078,6 +1078,8 @@ fn handle_stderr(
                 let is_elicitation_result = line.contains("[ElicitationResult Hook]");
                 let is_stop_failure = line.contains("[StopFailure Hook]");
                 let is_post_compact = line.contains("[PostCompact Hook]");
+                let is_cwd_changed = line.contains("[CwdChanged Hook]");
+                let is_file_changed = line.contains("[FileChanged Hook]");
 
                 let line_type = if is_worktree_create || is_worktree_remove {
                     "worktree"
@@ -1089,6 +1091,10 @@ fn handle_stderr(
                     "error"
                 } else if is_post_compact {
                     "compact-prompt"
+                } else if is_cwd_changed {
+                    "cwd-changed"
+                } else if is_file_changed {
+                    "file-changed"
                 } else {
                     "error"
                 };
@@ -1227,6 +1233,57 @@ fn handle_stderr(
                             parent_tool_use_id: None,
                         },
                     );
+                } else if is_cwd_changed {
+                    let data = parse_cwd_changed_hook(&line);
+                    let friendly_content =
+                        format!("Working directory changed to: {}", data.cwd);
+
+                    let _ = app.emit(
+                        "claude:cwd-changed",
+                        CwdChangedEvent {
+                            cwd: data.cwd,
+                            conversation_id: conversation_id.clone(),
+                        },
+                    );
+
+                    let _ = app.emit(
+                        "claude:output",
+                        OutputEvent {
+                            line_type: "cwd-changed".to_string(),
+                            content: friendly_content,
+                            tool_name: None,
+                            conversation_id: conversation_id.clone(),
+                            cost: None,
+                            parent_tool_use_id: None,
+                        },
+                    );
+                } else if is_file_changed {
+                    let data = parse_file_changed_hook(&line);
+                    let friendly_content = if data.file.is_empty() {
+                        "File changed".to_string()
+                    } else {
+                        format!("File changed: {}", data.file)
+                    };
+
+                    let _ = app.emit(
+                        "claude:file-changed",
+                        FileChangedEvent {
+                            file: data.file,
+                            conversation_id: conversation_id.clone(),
+                        },
+                    );
+
+                    let _ = app.emit(
+                        "claude:output",
+                        OutputEvent {
+                            line_type: "file-changed".to_string(),
+                            content: friendly_content,
+                            tool_name: None,
+                            conversation_id: conversation_id.clone(),
+                            cost: None,
+                            parent_tool_use_id: None,
+                        },
+                    );
                 } else {
                     let _ = app.emit(
                         "claude:output",
@@ -1440,6 +1497,42 @@ fn parse_post_compact_hook(line: &str) -> PostCompactData {
     PostCompactData { session_id }
 }
 
+#[derive(Debug)]
+struct CwdChangedData {
+    cwd: String,
+}
+
+fn parse_cwd_changed_hook(line: &str) -> CwdChangedData {
+    let cwd = extract_quoted_value(line, "cwd")
+        .or_else(|| extract_quoted_value(line, "path"))
+        .or_else(|| {
+            line.split("[CwdChanged Hook]")
+                .nth(1)
+                .map(|s| s.trim().to_string())
+                .filter(|s| !s.is_empty())
+        })
+        .unwrap_or_default();
+    CwdChangedData { cwd }
+}
+
+#[derive(Debug)]
+struct FileChangedData {
+    file: String,
+}
+
+fn parse_file_changed_hook(line: &str) -> FileChangedData {
+    let file = extract_quoted_value(line, "file")
+        .or_else(|| extract_quoted_value(line, "path"))
+        .or_else(|| {
+            line.split("[FileChanged Hook]")
+                .nth(1)
+                .map(|s| s.trim().to_string())
+                .filter(|s| !s.is_empty())
+        })
+        .unwrap_or_default();
+    FileChangedData { file }
+}
+
 /// Extracts a double-quoted string value from a `key="value"` pair in a hook line.
 /// Handles escape sequences within the quoted value.
 fn extract_quoted_value(line: &str, key: &str) -> Option<String> {
@@ -3588,6 +3681,62 @@ mod tests {
         assert_eq!(data.session_id, None);
     }
 
+    #[test]
+    fn test_parse_cwd_changed_hook_with_cwd_key() {
+        let line = r#"[CwdChanged Hook] cwd="/home/naomi/code/my-project""#;
+        let data = parse_cwd_changed_hook(line);
+        assert_eq!(data.cwd, "/home/naomi/code/my-project");
+    }
+
+    #[test]
+    fn test_parse_cwd_changed_hook_with_path_key() {
+        let line = r#"[CwdChanged Hook] path="/tmp/workspace""#;
+        let data = parse_cwd_changed_hook(line);
+        assert_eq!(data.cwd, "/tmp/workspace");
+    }
+
+    #[test]
+    fn test_parse_cwd_changed_hook_bare_path_fallback() {
+        let line = "[CwdChanged Hook] /home/naomi/code/project";
+        let data = parse_cwd_changed_hook(line);
+        assert_eq!(data.cwd, "/home/naomi/code/project");
+    }
+
+    #[test]
+    fn test_parse_cwd_changed_hook_empty_line() {
+        let line = "[CwdChanged Hook]";
+        let data = parse_cwd_changed_hook(line);
+        assert_eq!(data.cwd, "");
+    }
+
+    #[test]
+    fn test_parse_file_changed_hook_with_file_key() {
+        let line = r#"[FileChanged Hook] file="/home/naomi/code/project/src/main.rs""#;
+        let data = parse_file_changed_hook(line);
+        assert_eq!(data.file, "/home/naomi/code/project/src/main.rs");
+    }
+
+    #[test]
+    fn test_parse_file_changed_hook_with_path_key() {
+        let line = r#"[FileChanged Hook] path="/tmp/test.txt""#;
+        let data = parse_file_changed_hook(line);
+        assert_eq!(data.file, "/tmp/test.txt");
+    }
+
+    #[test]
+    fn test_parse_file_changed_hook_bare_path_fallback() {
+        let line = "[FileChanged Hook] /home/naomi/code/project/README.md";
+        let data = parse_file_changed_hook(line);
+        assert_eq!(data.file, "/home/naomi/code/project/README.md");
+    }
+
+    #[test]
+    fn test_parse_file_changed_hook_empty_line() {
+        let line = "[FileChanged Hook]";
+        let data = parse_file_changed_hook(line);
+        assert_eq!(data.file, "");
+    }
+
     #[test]
     fn test_build_stop_failure_message_no_fields() {
         let data = StopFailureData {