feat: tx list --flat, account create --if-not-exists, --since/--until doc (v0.3.6)v0.3.6

Three smaller ISSUES.md items, one PATCH (two optional flags + a doc fix; no
existing caller or JSON shape changes).

- tx list --flat: emit one top-level object per split (journal id repeated),
  dropping the transactions[] nesting so single-split journals script cleanly.
  JSON-only; --human already explodes splits into a table.
- account create --if-not-exists: resolve the name first; on a clash return the
  existing account with "existed": true (exit 0) instead of surfacing Firefly's
  422, so import scripts are idempotent. Detects via resolver, not by parsing
  the error string.
- SKILL.md documents that --since/--until filter on the transaction date (the
  value date); Firefly journals have a single date field, no separate book date
  (verified against firefly-iii TimeCollection setRange).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 35 insertions, 1 deletions

diff --git a/tests/unit/test_commands_account.py b/tests/unit/test_commands_account.py
index 4a01292..c328890 100644
--- a/tests/unit/test_commands_account.py
+++ b/tests/unit/test_commands_account.py
@@ -43,7 +43,8 @@ class TestAccountCmd(unittest.TestCase):
 
 class TestAccountCreate(unittest.TestCase):
     def _args(self, **kw):
-        base = dict(name=None, type=None, opening_balance=None, currency=None)
+        base = dict(name=None, type=None, opening_balance=None, currency=None,
+                    if_not_exists=False)
         base.update(kw)
         m = MagicMock()
         m.configure_mock(**base)  # 'name' is reserved in MagicMock ctor, not configure_mock
@@ -89,3 +90,36 @@ class TestAccountCreate(unittest.TestCase):
         with self.assertRaises(FireflyError):
             acct.cmd_create(self._args(name="X", type="bogus"), ctx)
         client.request.assert_not_called()
+
+    def test_if_not_exists_returns_existing_no_post(self):
+        ctx, client, resolver = make_ctx()
+        resolver.account.return_value = {"id": "5", "name": "Savings",
+                                         "type": "asset"}
+        rc = acct.cmd_create(
+            self._args(name="Savings", type="asset", if_not_exists=True), ctx)
+        self.assertEqual(rc, 0)
+        resolver.account.assert_called_once_with("Savings")
+        client.request.assert_not_called()  # existed -> no create
+
+    def test_if_not_exists_creates_when_missing(self):
+        from firefly_cli.errors import ResolutionError
+        ctx, client, resolver = make_ctx()
+        resolver.account.side_effect = ResolutionError('No account named "Savings"')
+        client.request.return_value = {"data": {"id": "9", "attributes": {}}}
+        rc = acct.cmd_create(
+            self._args(name="Savings", type="asset", if_not_exists=True), ctx)
+        self.assertEqual(rc, 0)
+        method, path = client.request.call_args[0][:2]
+        self.assertEqual((method, path), ("POST", "/api/v1/accounts"))
+
+    def test_if_not_exists_emits_existed_flag(self):
+        import io, json
+        from contextlib import redirect_stdout
+        ctx, client, resolver = make_ctx()
+        resolver.account.return_value = {"id": "5", "name": "Savings"}
+        buf = io.StringIO()
+        with redirect_stdout(buf):
+            acct.cmd_create(
+                self._args(name="Savings", type="asset", if_not_exists=True), ctx)
+        self.assertEqual(json.loads(buf.getvalue()),
+                         {"id": "5", "name": "Savings", "existed": True})