initial release

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

LICENSE

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+Copyright © 2019 Filipe Laíns <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

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+# python-build
+
+A simple, correct PEP517 package builder.
+
+```sh
+$ python -m build -h
+usage: __main__.py [-h] [--verbose] [--sdist] [--wheel] [--outdir ./dist] [.]
+
+positional arguments:
+  .                     source directory (defaults to current directory)
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --verbose, -v         enable verbose output
+  --sdist, -s           build a source package
+  --wheel, -w           build a wheel
+  --outdir ./dist, -o ./dist
+                        output directory
+```

build/__init__.py

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+# SPDX-License-Identifier: MIT
+
+'''
+python-build - A simple, correct PEP517 package builder
+'''
+__version__ = '0.0.1'
+
+import importlib
+import os
+
+from typing import List
+
+import pep517.wrappers
+import toml
+
+
+class BuildException(Exception):
+    pass
+
+
+class BuildBackendException(Exception):
+    pass
+
+
+class ProjectBuilder(object):
+    def __init__(self, srcdir='.'):  # type: (str) -> None
+        self.srcdir = srcdir
+
+        spec_file = os.path.join(srcdir, 'pyproject.toml')
+
+        if not os.path.isfile(spec_file):
+            raise BuildException(f'Missing project file: {spec_file}')
+
+        with open(spec_file) as f:
+            self._spec = toml.load(f)
+
+        try:
+            self._build_system = self._spec['build-system']
+            self._backend = self._build_system['build-backend']
+        except KeyError:
+            raise BuildException('Missing backend definition in project file')
+
+        try:
+            importlib.import_module(self._backend)
+        except ImportError:
+            raise BuildException(f"Backend '{self._backend}' is not available")
+
+        self.hook = pep517.wrappers.Pep517HookCaller(self.srcdir, self._backend,
+                                                     backend_path=self._build_system.get('backend-path'))
+
+    def check_depencencies(self, distribution):  # type: (str) -> List[str]
+        '''
+        Returns a set of the missing dependencies
+        '''
+        get_requires = getattr(self.hook, f'get_requires_for_build_{distribution}')
+
+        dependencies = set()
+
+        try:
+            dependencies.update(get_requires())
+        except pep517.wrappers.BackendUnavailable as e:
+            raise e
+        except Exception as e:  # noqa: E722
+            raise BuildBackendException(f'Backend operation failed: {e}')
+
+        missing = []
+        for dep in dependencies:
+            try:
+                importlib.import_module(dep)
+            except ImportError:
+                missing.append(dep)
+
+        return missing
+
+    def build(self, distribution, outdir):  # type: (str, str) -> None
+        '''
+        Builds a distribution
+        '''
+        build = getattr(self.hook, f'build_{distribution}')
+
+        try:
+            build(outdir)
+        except Exception as e:  # noqa: E722
+            raise BuildBackendException(f'Backend operation failed: {e}')

build/__main__.py

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+# SPDX-License-Identifier: MIT
+
+import argparse
+import os
+import sys
+import traceback
+
+from . import BuildException, BuildBackendException, ProjectBuilder
+
+
+def _error(msg, code=1):  # type: (str, int) -> None
+    prefix = 'ERROR'
+    if sys.stdout.isatty():
+        prefix = '\33[91m' + prefix + '\33[0m'
+    print(prefix, msg)
+    exit(code)
+
+
+if __name__ == '__main__':  # noqa: C901
+    cwd = os.getcwd()
+    out = os.path.join(cwd, 'dist')
+    parser = argparse.ArgumentParser()
+    parser.add_argument('srcdir',
+                        type=str, nargs='?', metavar=cwd, default=cwd,
+                        help='source directory (defaults to current directory)')
+    parser.add_argument('--verbose', '-v',
+                        action='store_true',
+                        help='enable verbose output')
+    parser.add_argument('--sdist', '-s',
+                        action='store_true',
+                        help='build a source package')
+    parser.add_argument('--wheel', '-w',
+                        action='store_true',
+                        help='build a wheel')
+    parser.add_argument('--outdir', '-o', metavar=out,
+                        type=str, default=out,
+                        help='output directory')
+    args = parser.parse_args()
+
+    distributions = []
+
+    if args.sdist:
+        distributions.append('sdist')
+    if args.wheel:
+        distributions.append('wheel')
+
+    # default targets
+    if not distributions:
+        distributions = ['sdist', 'wheel']
+
+    try:
+        builder = ProjectBuilder(args.srcdir)
+
+        for dist in distributions:
+            missing = builder.check_depencencies(dist)
+            if missing:
+                _error(f'Missing dependencies: {" ".join(missing)}')
+
+            builder.build(dist, args.outdir)
+    except BuildException as e:
+        _error(str(e))
+    except BuildBackendException as e:
+        if sys.version_info >= (3, 5):
+            print(traceback.format_exc(-1))
+        else:
+            print(traceback.format_exc())
+        _error(str(e))

pyproject.toml

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+[build-system]
+requires = ["flit_core >=2,<3"]
+build-backend = "flit_core.buildapi"
+
+[tool.flit.metadata]
+module = "build"
+author = "Filipe Laíns"
+author-email = "[email protected]"
+home-page = "https://github.com/FFY00/python-build"
+description-file = "README.md"
+requires = [
+    "toml",
+    "pep517",
+]
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 2.7",
+    "Programming Language :: Python :: 3",
+]