Add initial profile support

3 files changed, 38 insertions, 9 deletions

diff --git a/isort/exceptions.py b/isort/exceptions.py
index 4c512fd3..b62b2c5d 100644
--- a/isort/exceptions.py
+++ b/isort/exceptions.py
@@ -1,7 +1,7 @@
 """All isort specific exception classes should be defined here"""
 from pathlib import Path
 
-from .settings import FILE_SKIP_COMMENT
+from .profiles import profiles
 
 
 class ISortError(Exception):
@@ -54,8 +54,7 @@ class FileSkipComment(FileSkipped):
 
     def __init__(self, file_path: str):
         super().__init__(
-            f"{file_path} contains an {FILE_SKIP_COMMENT} comment and was skipped.",
-            file_path=file_path,
+            f"{file_path} contains an file skip comment and was skipped.", file_path=file_path
         )
 
 
@@ -68,3 +67,13 @@ class FileSkipSetting(FileSkipped):
             " or matches a glob in 'skip_glob' setting",
             file_path=file_path,
         )
+
+
+class ProfileDoesNotExist(ISortError):
+    """Raised when a profile is set by the user that doesn't exist"""
+
+    def __init__(self, profile: str):
+        super().__init__(
+            f"Specified profile of {profile} does not exist. "
+            f"Available profiles: {','.join(profiles)}."
+        )
diff --git a/isort/main.py b/isort/main.py
index 2d47f79b..a8e17193 100644
--- a/isort/main.py
+++ b/isort/main.py
@@ -11,11 +11,10 @@ from warnings import warn
 
 import setuptools
 
-from isort import SortImports, __version__
-from isort.logo import ASCII_ART
-from isort.settings import DEFAULT_CONFIG, VALID_PY_TARGETS, Config, WrapModes
-
-from . import sections
+from . import SortImports, __version__, sections
+from .logo import ASCII_ART
+from .profiles import profiles
+from .settings import DEFAULT_CONFIG, VALID_PY_TARGETS, Config, WrapModes
 
 shebang_re = re.compile(br"^#!.*\bpython[23w]?\b")
 
@@ -524,6 +523,13 @@ def parse_args(argv: Optional[Sequence[str]] = None) -> Dict[str, Any]:
         "interpreter used to run isort "
         f"(currently: {sys.version_info.major}{sys.version_info.minor}) will be used.",
     )
+    parser.add_argument(
+        "--profile",
+        dest="profile",
+        choices=list(profiles.keys()),
+        type=str,
+        help="Base profile type to use for configuration.",
+    )
 
     arguments = {key: value for key, value in vars(parser.parse_args(argv)).items() if value}
     if "dont_order_by_type" in arguments:
diff --git a/isort/settings.py b/isort/settings.py
index 48934b74..709f230c 100644
--- a/isort/settings.py
+++ b/isort/settings.py
@@ -34,6 +34,8 @@ from warnings import warn
 
 from . import stdlibs
 from ._future import dataclass, field
+from .exceptions import ProfileDoesNotExist
+from .profiles import profiles
 from .sections import DEFAULT as SECTION_DEFAULTS
 from .utils import difference, union
 from .wrap_modes import WrapModes
@@ -167,6 +169,7 @@ class _Config:
     conda_env: str = ""
     ensure_newline_before_comments: bool = False
     directory: str = ""
+    profile: str = ""
 
     def __post_init__(self):
         py_version = self.py_version
@@ -220,13 +223,24 @@ class Config(_Config):
         else:
             config_settings = {}
 
+        profile_name = config_overrides.get("profile", config_settings.get("profile", ""))
+        if profile_name:
+            if profile_name not in profiles:
+                raise ProfileDoesNotExist(profile)
+
+            profile = profiles[profile_name].copy()
+            profile["source"] = f"{profile_name} profile"
+            sources.append(profile)
+        else:
+            profile = {}
+
         if config_settings:
             sources.append(config_settings)
         if config_overrides:
             config_overrides["source"] = "runtime"
             sources.append(config_overrides)
 
-        combined_config = {**config_settings, **config_overrides}
+        combined_config = {**profile, **config_settings, **config_overrides}
         if "indent" in combined_config:
             indent = str(combined_config["indent"])
             if indent.isdigit():