fix: Windows cookie diagnostics (#28) and rich output pipe capture (#29)

- Add win32 branch in _diagnose_keychain_issues() with DPAPI/admin/shadowcopy hints
- Add _make_console() helper in formatter.py with force_terminal=False for Windows non-TTY
- Replace all 6 Console() defaults with _make_console()
- Add test for Windows-specific diagnostics

tests/test_auth.py

@@ -349,6 +349,22 @@ def test_diagnose_keychain_issues_ssh_hint(monkeypatch) -> None:
     assert "security unlock-keychain" in hint
 
 
+def test_diagnose_keychain_issues_windows_hint(monkeypatch) -> None:
+    """On Windows, hint should mention DPAPI and environment variable workaround."""
+    monkeypatch.setattr("sys.platform", "win32")
+    monkeypatch.delenv("SSH_CLIENT", raising=False)
+    monkeypatch.delenv("SSH_TTY", raising=False)
+    monkeypatch.delenv("SSH_CONNECTION", raising=False)
+
+    diagnostics = ["chrome: Unable to get key for cookie decryption"]
+    hint = auth._diagnose_keychain_issues(diagnostics)
+
+    assert hint is not None
+    assert "DPAPI" in hint
+    assert "TWITTER_AUTH_TOKEN" in hint
+    assert "shadowcopy" in hint
+
+
 def test_diagnose_keychain_issues_returns_none_for_unrelated_errors() -> None:
     """Should return None when diagnostics don't mention Keychain."""
     diagnostics = ["chrome[Default]=no-cookies", "firefox: profile not found"]

twitter_cli/auth.py

@@ -65,6 +65,15 @@ def _diagnose_keychain_issues(diagnostics: List[str]) -> Optional[str]:
             "  Fix: Open Keychain Access → search for \"<Browser> Safe Storage\" → Access Control → add your Terminal app.\n"
             "  Or click \"Always Allow\" when the Keychain authorization popup appears."
         )
+    if sys.platform == "win32":
+        return (
+            "Windows DPAPI cookie decryption failed.\n"
+            "  Possible causes:\n"
+            "  1. Chrome is running (locks the cookie database). Try closing Chrome first.\n"
+            "  2. browser_cookie3 may not support the latest Chrome cookie encryption format.\n"
+            "  3. If Chrome was running, admin privileges may be required for VSS shadowcopy.\n"
+            "  Workaround: Set TWITTER_AUTH_TOKEN and TWITTER_CT0 environment variables manually."
+        )
     # Linux: gnome-keyring / SecretStorage issues
     return (
         "System keyring access failed — the cookie encryption key could not be retrieved.\n"

twitter_cli/formatter.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import sys
 from typing import List, Optional
 
 from rich.console import Console
@@ -13,6 +14,18 @@ from .models import Tweet, UserProfile
 from .timeutil import format_local_time, format_relative_time
 
 
+def _make_console() -> Console:
+    """Create a Console that works correctly on Windows pipes.
+
+    On Windows, rich may use WriteConsoleW API directly instead of writing
+    to stdout, making output invisible to pipe/subprocess capture.
+    Using force_terminal=False in non-TTY contexts prevents this.
+    """
+    if sys.platform == "win32" and not sys.stdout.isatty():
+        return Console(force_terminal=False)
+    return Console()
+
+
 def format_number(n: int) -> str:
     """Format number with K/M suffixes."""
     if n >= 1_000_000:
@@ -30,7 +43,7 @@ def print_tweet_table(
 ) -> None:
     """Print tweets as a rich table."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     if not title:
         title = "📱 Twitter — %d tweets" % len(tweets)
@@ -101,7 +114,7 @@ def print_tweet_table(
 def print_tweet_detail(tweet: Tweet, console: Optional[Console] = None) -> None:
     """Print a single tweet in detail using a rich panel."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     verified = " ✓" if tweet.author.verified else ""
     header = "@%s%s (%s)" % (tweet.author.screen_name, verified, tweet.author.name)
@@ -181,7 +194,7 @@ def article_to_markdown(tweet: Tweet) -> str:
 def print_article(tweet: Tweet, console: Optional[Console] = None) -> None:
     """Print a Twitter Article with rich formatting."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     verified = " ✓" if tweet.author.verified else ""
     title = tweet.article_title or "Twitter Article"
@@ -218,7 +231,7 @@ def print_filter_stats(
 ) -> None:
     """Print filter statistics."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     console.print(
         "📊 Filter: %d → %d tweets" % (original_count, len(filtered))
@@ -234,7 +247,7 @@ def print_filter_stats(
 def print_user_profile(user: UserProfile, console: Optional[Console] = None) -> None:
     """Print user profile as a rich panel."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     verified = " ✓" if user.verified else ""
     header = "@%s%s (%s)" % (user.screen_name, verified, user.name)
@@ -280,7 +293,7 @@ def print_user_table(
 ) -> None:
     """Print a list of users as a rich table."""
     if console is None:
-        console = Console()
+        console = _make_console()
 
     if not title:
         title = "👥 Users — %d" % len(users)