1 files changed, 91 insertions, 0 deletions
diff --git a/src/debputy/_deb_options_profiles.py b/src/debputy/_deb_options_profiles.py
new file mode 100644
index 0000000..fddb1b7
--- /dev/null
+++ b/src/debputy/_deb_options_profiles.py
@@ -0,0 +1,91 @@
+import os
+from functools import lru_cache
+
+from typing import FrozenSet, Optional, Mapping, Dict
+
+
+def _parse_deb_build_options(value: str) -> Mapping[str, Optional[str]]:
+    res: Dict[str, Optional[str]] = {}
+    for kvish in value.split():
+        if "=" in kvish:
+            key, value = kvish.split("=", 1)
+            res[key] = value
+        else:
+            res[kvish] = None
+    return res
+
+
+class DebBuildOptionsAndProfiles:
+    """Accessor to common environment related values
+
+    >>> env = DebBuildOptionsAndProfiles(environ={'DEB_BUILD_PROFILES': 'noudeb nojava'})
+    >>> 'noudeb' in env.deb_build_profiles
+    True
+    >>> 'nojava' in env.deb_build_profiles
+    True
+    >>> 'nopython' in env.deb_build_profiles
+    False
+    >>> sorted(env.deb_build_profiles)
+    ['nojava', 'noudeb']
+    """
+
+    def __init__(self, *, environ: Optional[Mapping[str, str]] = None) -> None:
+        """Provide a view of the options. Though consider using DebBuildOptionsAndProfiles.instance() instead
+
+        :param environ: Alternative to os.environ. Mostly useful for testing purposes
+        """
+        if environ is None:
+            environ = os.environ
+        self._deb_build_profiles = frozenset(
+            x for x in environ.get("DEB_BUILD_PROFILES", "").split()
+        )
+        self._deb_build_options = _parse_deb_build_options(
+            environ.get("DEB_BUILD_OPTIONS", "")
+        )
+
+    @staticmethod
+    @lru_cache(1)
+    def instance() -> "DebBuildOptionsAndProfiles":
+        return DebBuildOptionsAndProfiles()
+
+    @property
+    def deb_build_profiles(self) -> FrozenSet[str]:
+        """A set-like view of all build profiles active during the build
+
+        >>> env = DebBuildOptionsAndProfiles(environ={'DEB_BUILD_PROFILES': 'noudeb nojava'})
+        >>> 'noudeb' in env.deb_build_profiles
+        True
+        >>> 'nojava' in env.deb_build_profiles
+        True
+        >>> 'nopython' in env.deb_build_profiles
+        False
+        >>> sorted(env.deb_build_profiles)
+        ['nojava', 'noudeb']
+
+        """
+        return self._deb_build_profiles
+
+    @property
+    def deb_build_options(self) -> Mapping[str, Optional[str]]:
+        """A set-like view of all build profiles active during the build
+
+        >>> env = DebBuildOptionsAndProfiles(environ={'DEB_BUILD_OPTIONS': 'nostrip parallel=4'})
+        >>> 'nostrip' in env.deb_build_options
+        True
+        >>> 'parallel' in env.deb_build_options
+        True
+        >>> 'noautodbgsym' in env.deb_build_options
+        False
+        >>> env.deb_build_options['nostrip'] is None
+        True
+        >>> env.deb_build_options['parallel']
+        '4'
+        >>> env.deb_build_options['noautodbgsym']
+        Traceback (most recent call last):
+            ...
+        KeyError: 'noautodbgsym'
+        >>> sorted(env.deb_build_options)
+        ['nostrip', 'parallel']
+
+        """
+        return self._deb_build_options