small tweaks

client/ayon_core/cli.py

@@ -239,15 +239,12 @@ def version(build):
 
 def _set_global_environments() -> None:
     """Set global AYON environments."""
-    general_env = get_general_environments()
+    # First resolve general environment
+    general_env = parse_env_variables_structure(get_general_environments())
 
-    # first resolve general environment because merge doesn't expect
-    # values to be list.
-    # TODO: switch to AYON environment functions
+    # Merge environments with current environments and update values
     merged_env = merge_env_variables(
-        compute_env_variables_structure(
-            parse_env_variables_structure(general_env)
-        ),
+        compute_env_variables_structure(general_env),
         dict(os.environ)
     )
     env = compute_env_variables_structure(merged_env)

client/ayon_core/lib/env_tools.py

@@ -13,11 +13,6 @@
     PlatformName = Literal["windows", "linux", "darwin"]
     EnvValue = Union[str, list[str], dict[str, str], dict[str, list[str]]]
 
-Results = collections.namedtuple(
-    "Results",
-    ["sorted", "cyclic"]
-)
-
 
 class CycleError(ValueError):
     """Raised when a cycle is detected in dynamic env variables compute."""
@@ -124,7 +119,8 @@ def parse_env_variables_structure(
         dict: The flattened environment for a platform.
 
     """
-    platform_name = platform_name or platform.system().lower()
+    if platform_name is None:
+        platform_name = platform.system().lower()
 
     result = {}
     for variable, value in env.items():
@@ -147,72 +143,94 @@ def parse_env_variables_structure(
     return result
 
 
-def _topological_sort(dependency_pairs):
-    """Sort values subject to dependency constraints"""
+def _topological_sort(
+    dependencies: dict[str, set[str]]
+) -> tuple[list[str], list[str]]:
+    """Sort values subject to dependency constraints.
+
+    Args:
+        dependencies (dict[str, set[str]): Mapping of environment variable
+            keys to a set of keys they depend on.
+
+    Returns:
+        tuple[list[str], list[str]]: A tuple of two lists. The first list
+            contains the ordered keys in which order should be environment
+            keys filled, the second list contains the keys that would cause
+            cyclic fill of values.
+
+    """
     num_heads = collections.defaultdict(int)  # num arrows pointing in
     tails = collections.defaultdict(list)  # list of arrows going out
     heads = []  # unique list of heads in order first seen
-    for h, t in dependency_pairs:
-        num_heads[t] += 1
-        if h in tails:
-            tails[h].append(t)
-        else:
-            tails[h] = [t]
-            heads.append(h)
-
-    ordered = [h for h in heads if h not in num_heads]
-    for h in ordered:
-        for t in tails[h]:
-            num_heads[t] -= 1
-            if not num_heads[t]:
-                ordered.append(t)
-    cyclic = [n for n, heads in num_heads.items() if heads]
-    return Results(ordered, cyclic)
+    for head, tail_values in dependencies.items():
+        for tail_value in tail_values:
+            num_heads[tail_value] += 1
+            if head not in tails:
+                heads.append(head)
+            tails[head].append(tail_value)
+
+    ordered = [head for head in heads if head not in num_heads]
+    for head in ordered:
+        for tail in tails[head]:
+            num_heads[tail] -= 1
+            if not num_heads[tail]:
+                ordered.append(tail)
+    cyclic = [tail for tail, heads in num_heads.items() if heads]
+    return ordered, cyclic
+
+
+class _PartialFormatDict(dict):
+    """This supports partial formatting.
+
+    Missing keys are replaced with the return value of __missing__.
+
+    """
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self._missing_template: str = "{{{key}}}"
+
+    def set_missing_template(self, template: str):
+        self._missing_template = template
+
+    def __missing__(self, key: str) -> str:
+        return self._missing_template.format(key=key)
 
 
 def _partial_format(
-    s: str,
+    value: str,
     data: dict[str, str],
-    missing: Optional[str] = None,
+    missing_template: Optional[str] = None,
 ) -> str:
     """Return string `s` formatted by `data` allowing a partial format
 
     Arguments:
-        s (str): The string that will be formatted
+        value (str): The string that will be formatted
         data (dict): The dictionary used to format with.
+        missing_template (Optional[str]): The template to use when a key is
+            missing from the data. If `None`, the key will remain unformatted.
 
     Example:
         >>> _partial_format("{d} {a} {b} {c} {d}", {'b': "and", 'd': "left"})
         'left {a} and {c} left'
-    """
-
-    if missing is None:
-        missing = "{{{key}}}"
-
-    class FormatDict(dict):
-        """This supports partial formatting.
 
-        Missing keys are replaced with the return value of __missing__.
-
-        """
+    """
 
-        def __missing__(self, key):
-            return missing.format(key=key)
+    mapping = _PartialFormatDict(**data)
+    if missing_template is not None:
+        mapping.set_missing_template(missing_template)
 
     formatter = Formatter()
-    mapping = FormatDict(**data)
     try:
-        f = formatter.vformat(s, (), mapping)
+        output = formatter.vformat(value, (), mapping)
     except Exception:
         r_token = re.compile(r"({.*?})")
-        matches = re.findall(r_token, s)
-        f = s
-        for m in matches:
+        output = value
+        for match in re.findall(r_token, value):
             try:
-                f = re.sub(m, m.format(**data), f)
-            except (KeyError, ValueError):
+                output = re.sub(match, match.format(**data), output)
+            except (KeyError, ValueError, IndexError):
                 continue
-    return f
+    return output
 
 
 def compute_env_variables_structure(
@@ -230,44 +248,29 @@ def compute_env_variables_structure(
     env = env.copy()
 
     # Collect dependencies
-    dependencies = []
+    dependencies = collections.defaultdict(set)
     for key, value in env.items():
-        try:
-            dependent_keys = re.findall("{(.+?)}", value)
-            for dependency in dependent_keys:
-                # Ignore direct references to itself because
-                # we don't format with itself anyway
-                if dependency == key:
-                    continue
-
-                dependencies.append((key, dependency))
-        except Exception:
-            dependencies.append((key, value))
+        dependent_keys = re.findall("{(.+?)}", value)
+        for dependent_key in dependent_keys:
+            # Ignore reference to itself or key is not in env
+            if dependent_key != key and dependent_key in env:
+                dependencies[key].add(dependent_key)
 
-    result = _topological_sort(dependencies)
+    ordered, cyclic = _topological_sort(dependencies)
 
     # Check cycle
-    if result.cyclic:
-        raise CycleError(f"A cycle is detected on: {result.cyclic}")
+    if cyclic:
+        raise CycleError(f"A cycle is detected on: {cyclic}")
 
     # Format dynamic values
-    for key in reversed(result.sorted):
+    for key in reversed(ordered):
         if key in env:
             if not isinstance(env[key], str):
                 continue
             data = env.copy()
             data.pop(key)    # format without itself
             env[key] = _partial_format(env[key], data=data)
 
-    # Format cyclic values
-    for key in result.cyclic:
-        if key in env:
-            if not isinstance(env[key], str):
-                continue
-            data = env.copy()
-            data.pop(key)   # format without itself
-            env[key] = _partial_format(env[key], data=data)
-
     # Format dynamic keys
     if fill_dynamic_keys:
         formatted = {}
@@ -291,7 +294,7 @@ def compute_env_variables_structure(
 def merge_env_variables(
     src_env: dict[str, str],
     dst_env: dict[str, str],
-    missing: Optional[str] = None,
+    missing_template: Optional[str] = None,
 ):
     """Merge the tools environment with the 'current_env'.
 
@@ -304,7 +307,7 @@ def merge_env_variables(
         src_env (dict): The dynamic environment
         dst_env (dict): The target environment variables mapping to merge
             the dynamic environment into.
-        missing (str): Argument passed to '_partial_format' during merging.
+        missing_template (str): Argument passed to '_partial_format' during merging.
             `None` should keep missing keys unchanged.
 
     Returns:
@@ -314,7 +317,7 @@ def merge_env_variables(
     result = dst_env.copy()
     for key, value in src_env.items():
         result[key] = _partial_format(
-            str(value), data=dst_env, missing=missing
+            str(value), dst_env, missing_template
         )
 
     return result