feat: --yesterday flag

README.md

@@ -240,6 +240,7 @@ lightman run --dry-run --agent openai --score 9
 | `--prompt-file` | File containing prompt templates | `lightman.toml` |
 | `--start-date` | Start date to retrieve articles | None |
 | `--today` | Retrieve articles from today | None |
+| `--yesterday` | Retrieve articles from yesterday | None |
 
 ### Example Workflows
 

src/lightman_ai/cli.py

@@ -1,5 +1,5 @@
 import logging
-from datetime import date, datetime, time
+from datetime import date, datetime, time, timedelta
 from importlib import metadata
 from zoneinfo import ZoneInfo
 
@@ -70,6 +70,7 @@ def entry_point() -> None:
 )
 @click.option("--start-date", type=click.DateTime(formats=["%Y-%m-%d"]), help="Start date to retrieve articles")
 @click.option("--today", is_flag=True, help="Retrieve articles from today.")
+@click.option("--yesterday", is_flag=True, help="Retrieve articles from yesterday.")
 def run(
     agent: str,
     prompt: str,
@@ -82,6 +83,7 @@ def run(
     dry_run: bool,
     start_date: date | None,
     today: bool,
+    yesterday: bool,
 ) -> int:
     """
     Entrypoint of the application.
@@ -91,11 +93,15 @@ def run(
     load_dotenv(env_file)
     configure_sentry()
 
-    if start_date and today:
-        raise click.UsageError("--today and --start-date cannot be set at the same time.")
+    mutually_exclusive_fields_set = [x for x in [start_date, today, yesterday] if x]
+    if len(mutually_exclusive_fields_set) > 1:
+        raise click.UsageError("--today, --yesterday and --start-date are mutually exclusive. Set one at a time.")
     elif today:
         now = datetime.now(ZoneInfo(settings.TIME_ZONE))
         start_datetime = datetime.combine(now, time(0, 0), tzinfo=ZoneInfo(settings.TIME_ZONE))
+    elif yesterday:
+        yesterday_date = datetime.now(ZoneInfo(settings.TIME_ZONE)) - timedelta(days=1)
+        start_datetime = datetime.combine(yesterday_date, time(0, 0), tzinfo=ZoneInfo(settings.TIME_ZONE))
     elif isinstance(start_date, date):
         start_datetime = datetime.combine(start_date, time(0, 0), tzinfo=ZoneInfo(settings.TIME_ZONE))
     else:

tests/test_cli.py

@@ -63,7 +63,6 @@ def test_arguments(self, m_prompt: Mock, m_config: Mock, m_lightman: Mock, m_loa
     @patch("lightman_ai.cli.PromptConfig.get_config_from_file")
     def test_start_date(self, m_prompt: Mock, m_config: Mock, m_lightman: Mock, m_load_dotenv: Mock) -> None:
         runner = CliRunner()
-        m_prompt.return_value = PromptConfig({"eval": "eval prompt"})
         m_config.return_value = FileConfig()
 
         with patch_config_file():
@@ -89,19 +88,56 @@ def test_start_date(self, m_prompt: Mock, m_config: Mock, m_lightman: Mock, m_lo
         assert result.exit_code == 0
         assert m_lightman.call_count == 1
         assert m_lightman.call_args == call(
-            agent="gemini",
-            prompt="eval prompt",
-            score_threshold=1,
-            dry_run=False,
-            project_key=None,
-            request_id_type=None,
-            model=None,
+            agent=ANY,
+            prompt=ANY,
+            score_threshold=ANY,
+            dry_run=ANY,
+            project_key=ANY,
+            request_id_type=ANY,
+            model=ANY,
             start_date=datetime(2025, 7, 29, 0, 0, tzinfo=ZoneInfo(key="UTC")),
         )
-        assert m_config.call_count == 1
-        assert m_config.call_args == call(config_section="my-config", path="config-path")
-        assert m_prompt.call_args == call(path="prompt file")
-        assert m_load_dotenv.call_args == call(".env")  # Default env file
+
+    @patch("lightman_ai.cli.load_dotenv")
+    @patch("lightman_ai.cli.lightman")
+    @patch("lightman_ai.cli.FileConfig.get_config_from_file")
+    @patch("lightman_ai.cli.PromptConfig.get_config_from_file")
+    @freeze_time("2025-07-29 19:00:00")
+    def test_yesterday(self, m_prompt: Mock, m_config: Mock, m_lightman: Mock, m_load_dotenv: Mock) -> None:
+        runner = CliRunner()
+        m_config.return_value = FileConfig()
+
+        with patch_config_file():
+            result = runner.invoke(
+                cli.run,
+                [
+                    "--agent",
+                    "gemini",
+                    "--prompt",
+                    "eval",
+                    "--prompt-file",
+                    "prompt file",
+                    "--score",
+                    "1",
+                    "--config-file",
+                    "config-path",
+                    "--config",
+                    "my-config",
+                    "--yesterday",
+                ],
+            )
+        assert result.exit_code == 0
+        assert m_lightman.call_count == 1
+        assert m_lightman.call_args == call(
+            agent=ANY,
+            prompt=ANY,
+            score_threshold=ANY,
+            dry_run=ANY,
+            project_key=ANY,
+            request_id_type=ANY,
+            model=ANY,
+            start_date=datetime(2025, 7, 28, 0, 0, tzinfo=ZoneInfo(key="UTC")),
+        )
 
     @patch("lightman_ai.cli.load_dotenv")
     @patch("lightman_ai.cli.lightman")