Remember server settings between sessions

- Server URLs are now saved to ~/.artdag/config.json when provided
- Subsequent commands use saved settings without needing --server/--l2
- Priority: CLI args > env vars > saved config > defaults
- Added 'artdag config' command to view/clear settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -2,3 +2,4 @@ __pycache__/
 *.py[cod]
 .venv/
 venv/
+.scripts

artdag.py

@@ -15,14 +15,39 @@ import click
 import requests
 import yaml
 
-DEFAULT_SERVER = os.environ.get("ARTDAG_SERVER", "http://localhost:8100")
-DEFAULT_L2_SERVER = os.environ.get("ARTDAG_L2", "http://localhost:8200")
 CONFIG_DIR = Path.home() / ".artdag"
 TOKEN_FILE = CONFIG_DIR / "token.json"
+CONFIG_FILE = CONFIG_DIR / "config.json"
+
+# Defaults - can be overridden by env vars, config file, or CLI args
+_DEFAULT_SERVER = "http://localhost:8100"
+_DEFAULT_L2_SERVER = "http://localhost:8200"
+
+# Active server URLs (set during CLI init)
+DEFAULT_SERVER = None
+DEFAULT_L2_SERVER = None
+
+
+def load_config() -> dict:
+    """Load saved config (server URLs, etc.)."""
+    if CONFIG_FILE.exists():
+        try:
+            with open(CONFIG_FILE) as f:
+                return json.load(f)
+        except (json.JSONDecodeError, IOError):
+            return {}
+    return {}
+
+
+def save_config(config: dict):
+    """Save config to file."""
+    CONFIG_DIR.mkdir(parents=True, exist_ok=True)
+    with open(CONFIG_FILE, "w") as f:
+        json.dump(config, f, indent=2)
 
 
 def get_server():
-    """Get server URL from env or default."""
+    """Get server URL."""
     return DEFAULT_SERVER
 
 
@@ -82,20 +107,59 @@ def api_post(path: str, data: dict = None, params: dict = None, auth: bool = Fal
     return resp.json()
 
 
+def _get_default_server():
+    """Get default server from env, config, or builtin default."""
+    if os.environ.get("ARTDAG_SERVER"):
+        return os.environ["ARTDAG_SERVER"]
+    config = load_config()
+    return config.get("server", _DEFAULT_SERVER)
+
+
+def _get_default_l2():
+    """Get default L2 server from env, config, or builtin default."""
+    if os.environ.get("ARTDAG_L2"):
+        return os.environ["ARTDAG_L2"]
+    config = load_config()
+    return config.get("l2", _DEFAULT_L2_SERVER)
+
+
 @click.group()
-@click.option("--server", "-s", envvar="ARTDAG_SERVER", default=DEFAULT_SERVER,
-              help="L1 server URL")
-@click.option("--l2", envvar="ARTDAG_L2", default=DEFAULT_L2_SERVER,
-              help="L2 server URL")
+@click.option("--server", "-s", default=None,
+              help="L1 server URL (saved for future use)")
+@click.option("--l2", default=None,
+              help="L2 server URL (saved for future use)")
 @click.pass_context
 def cli(ctx, server, l2):
     """Art DAG Client - interact with L1 rendering server."""
     ctx.ensure_object(dict)
-    ctx.obj["server"] = server
-    ctx.obj["l2"] = l2
     global DEFAULT_SERVER, DEFAULT_L2_SERVER
-    DEFAULT_SERVER = server
-    DEFAULT_L2_SERVER = l2
+
+    config = load_config()
+    config_changed = False
+
+    # Use provided value, or fall back to saved/default
+    if server:
+        DEFAULT_SERVER = server
+        if config.get("server") != server:
+            config["server"] = server
+            config_changed = True
+    else:
+        DEFAULT_SERVER = _get_default_server()
+
+    if l2:
+        DEFAULT_L2_SERVER = l2
+        if config.get("l2") != l2:
+            config["l2"] = l2
+            config_changed = True
+    else:
+        DEFAULT_L2_SERVER = _get_default_l2()
+
+    # Save config if changed
+    if config_changed:
+        save_config(config)
+
+    ctx.obj["server"] = DEFAULT_SERVER
+    ctx.obj["l2"] = DEFAULT_L2_SERVER
 
 
 # ============ Auth Commands ============
@@ -245,6 +309,38 @@ def whoami():
         click.echo(f"Error: {e}", err=True)
 
 
+@cli.command("config")
+@click.option("--clear", is_flag=True, help="Clear saved server settings")
+def show_config(clear):
+    """Show or clear saved configuration."""
+    if clear:
+        if CONFIG_FILE.exists():
+            CONFIG_FILE.unlink()
+            click.echo("Configuration cleared")
+        else:
+            click.echo("No configuration to clear")
+        return
+
+    config = load_config()
+    click.echo(f"Config file: {CONFIG_FILE}")
+    click.echo()
+    click.echo(f"L1 Server: {DEFAULT_SERVER}")
+    if config.get("server"):
+        click.echo(f"  (saved)")
+    elif os.environ.get("ARTDAG_SERVER"):
+        click.echo(f"  (from ARTDAG_SERVER env)")
+    else:
+        click.echo(f"  (default)")
+
+    click.echo(f"L2 Server: {DEFAULT_L2_SERVER}")
+    if config.get("l2"):
+        click.echo(f"  (saved)")
+    elif os.environ.get("ARTDAG_L2"):
+        click.echo(f"  (from ARTDAG_L2 env)")
+    else:
+        click.echo(f"  (default)")
+
+
 # ============ Server Commands ============
 
 @cli.command()