refactor(config): centralize OS config paths into config.rs helpers

src/agent.rs

@@ -292,12 +292,7 @@ impl Drop for Agent {
 
 /// Load user/bot identity from shared config.
 fn load_user_context() -> String {
-    let home = std::env::var("HOME").unwrap_or_default();
-    let path = if cfg!(target_os = "macos") {
-        format!("{home}/Library/Application Support/ai.syui.log/config.json")
-    } else {
-        format!("{home}/.config/ai.syui.log/config.json")
-    };
+    let path = crate::config::shared_config_path();
     let config: serde_json::Value = std::fs::read_to_string(&path).ok()
         .and_then(|s| serde_json::from_str(&s).ok())
         .unwrap_or_default();
@@ -310,13 +305,7 @@ fn load_user_context() -> String {
 
 /// Load last 3 session summaries for agent context.
 fn recent_session_summary() -> String {
-    let dir = if cfg!(target_os = "macos") {
-        let home = std::env::var("HOME").unwrap_or_default();
-        format!("{home}/Library/Application Support/ai.syui.gpt/sessions")
-    } else {
-        let home = std::env::var("HOME").unwrap_or_default();
-        format!("{home}/.local/share/aishell/sessions")
-    };
+    let dir = crate::config::sessions_dir();
 
     let mut files: Vec<_> = std::fs::read_dir(&dir)
         .into_iter().flatten().flatten()

src/config.rs

@@ -1,6 +1,31 @@
 use serde::Deserialize;
 use std::path::Path;
 
+/// OS standard config directory.
+pub fn config_dir() -> String {
+    let home = std::env::var("HOME").unwrap_or_default();
+    if cfg!(target_os = "macos") {
+        format!("{home}/Library/Application Support")
+    } else {
+        std::env::var("XDG_CONFIG_HOME").unwrap_or_else(|_| format!("{home}/.config"))
+    }
+}
+
+/// Path to shared config: $cfg/ai.syui.log/config.json
+pub fn shared_config_path() -> String {
+    format!("{}/ai.syui.log/config.json", config_dir())
+}
+
+/// Path to aigpt config: $cfg/ai.syui.gpt/config.json
+pub fn gpt_config_path() -> String {
+    format!("{}/ai.syui.gpt/config.json", config_dir())
+}
+
+/// Path to sessions dir: $cfg/ai.syui.gpt/sessions
+pub fn sessions_dir() -> String {
+    format!("{}/ai.syui.gpt/sessions", config_dir())
+}
+
 #[derive(Clone, Deserialize)]
 pub struct AgentConfig {
     pub name: String,

src/headless.rs

@@ -575,13 +575,7 @@ fn save_to_aigpt_memory(decision: &str, agents: &[serde_json::Value]) {
 }
 
 fn aigpt_memory_dir() -> Option<String> {
-    let home = std::env::var("HOME").ok()?;
-    let config_path = if cfg!(target_os = "macos") {
-        format!("{home}/Library/Application Support/ai.syui.gpt/config.json")
-    } else {
-        format!("{home}/.config/ai.syui.gpt/config.json")
-    };
-
+    let config_path = config::gpt_config_path();
     let content = std::fs::read_to_string(&config_path).ok()?;
     let config: serde_json::Value = serde_json::from_str(&content).ok()?;
 
@@ -628,12 +622,7 @@ fn days_to_ymd(mut days: u64) -> (u64, u64, u64) {
 }
 
 fn session_base_dir() -> String {
-    let home = std::env::var("HOME").unwrap_or_else(|_| ".".to_string());
-    if cfg!(target_os = "macos") {
-        format!("{home}/Library/Application Support/ai.syui.gpt/sessions")
-    } else {
-        format!("{home}/.local/share/aishell/sessions")
-    }
+    config::sessions_dir()
 }
 
 // ── AI integration ─────────────────────────────────────────

src/tui.rs

@@ -664,12 +664,7 @@ fn parse_agent_commands(text: &str) -> Vec<(String, String, String)> {
 
 /// Load identity context from atproto config + recent chat.
 fn load_identity_context() -> String {
-    let home = std::env::var("HOME").unwrap_or_default();
-    let config_path = if cfg!(target_os = "macos") {
-        format!("{home}/Library/Application Support/ai.syui.log/config.json")
-    } else {
-        format!("{home}/.config/ai.syui.log/config.json")
-    };
+    let config_path = crate::config::shared_config_path();
 
     let config: serde_json::Value = match std::fs::read_to_string(&config_path) {
         Ok(s) => serde_json::from_str(&s).unwrap_or_default(),
@@ -693,14 +688,13 @@ fn load_identity_context() -> String {
     let expanded = expand_tilde(bot_path);
     let chat_dir = format!(
         "{}/{}/ai.syui.log.chat",
-        if expanded.is_empty() { format!("{home}/.config/ai.syui.log/at") } else { expanded.clone() },
+        if expanded.is_empty() { format!("{}/ai.syui.log/at", crate::config::config_dir()) } else { expanded.clone() },
         config["bot"]["did"].as_str().unwrap_or("did")
     );
 
-    // Also check user's chat dir
     let user_did = config["did"].as_str().unwrap_or("");
     let user_chat_dir = format!("{}/{}/ai.syui.log.chat",
-        if expanded.is_empty() { format!("{home}/.config/ai.syui.log/at") } else { expanded },
+        if expanded.is_empty() { format!("{}/ai.syui.log/at", crate::config::config_dir()) } else { expanded },
         user_did
     );