feat: parse hyprsunset.conf profiles

Implement minimal config parser with Profile dataclass and parse_config function.
Regex-based parsing of hyprsunset.conf format with support for time, identity,
temperature, and gamma fields. Foundation for later tasks (serialize, read/write, validation).

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

2 files changed, 65 insertions, 0 deletions

diff --git a/hyprsunset_qt/config.py b/hyprsunset_qt/config.py
new file mode 100644
index 0000000..c2ef010
--- /dev/null
+++ b/hyprsunset_qt/config.py
@@ -0,0 +1,40 @@
+"""Parse and serialize hyprsunset.conf profile blocks."""
+
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+
+_BLOCK_RE = re.compile(r"profile\s*\{(.*?)\}", re.DOTALL)
+
+
+@dataclass
+class Profile:
+    time: str = ""
+    identity: bool = False
+    temperature: int | None = None
+    gamma: float | None = None
+
+
+def _get(body: str, key: str) -> str | None:
+    m = re.search(rf"^\s*{key}\s*=\s*(.+?)\s*$", body, re.MULTILINE)
+    return m.group(1) if m else None
+
+
+def parse_config(text: str) -> list[Profile]:
+    profiles: list[Profile] = []
+    for block in _BLOCK_RE.finditer(text):
+        body = block.group(1)
+        time = _get(body, "time") or ""
+        identity = (_get(body, "identity") or "").lower() == "true"
+        temp = _get(body, "temperature")
+        gamma = _get(body, "gamma")
+        profiles.append(
+            Profile(
+                time=time,
+                identity=identity,
+                temperature=int(temp) if temp is not None else None,
+                gamma=float(gamma) if gamma is not None else None,
+            )
+        )
+    return profiles
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..4568160
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,25 @@
+from hyprsunset_qt.config import Profile, parse_config
+
+
+def test_parse_two_profiles():
+    text = """
+profile {
+    time = 5:00
+    identity = true
+}
+
+profile {
+    time = 19:40
+    temperature = 5500
+    gamma = 0.8
+}
+"""
+    profiles = parse_config(text)
+    assert profiles == [
+        Profile(time="5:00", identity=True, temperature=None, gamma=None),
+        Profile(time="19:40", identity=False, temperature=5500, gamma=0.8),
+    ]
+
+
+def test_parse_empty():
+    assert parse_config("") == []