black: ensure that `spack create` templates are black-compliant

- [x] remove alignment spaces from tempaltes
- [x] replace single with double quotes
- [x] Makefile template now generates parsable code
      (function body is `pass` instead of just a comment)
- [x] template checks now run black to check output

2 files changed, 101 insertions, 114 deletions

diff --git a/lib/spack/spack/cmd/create.py b/lib/spack/spack/cmd/create.py
index ea2f6d2ed9..2d7152b7b8 100644
--- a/lib/spack/spack/cmd/create.py
+++ b/lib/spack/spack/cmd/create.py
@@ -69,7 +69,7 @@ class {class_name}({base_class_name}):
 
     # FIXME: Add a list of GitHub accounts to
     # notify when the package is updated.
-    # maintainers = ['github_user1', 'github_user2']
+    # maintainers = ["github_user1", "github_user2"]
 
 {versions}
 
@@ -88,7 +88,7 @@ class BundlePackageTemplate(object):
 
     dependencies = """\
     # FIXME: Add dependencies if required.
-    # depends_on('foo')"""
+    # depends_on("foo")"""
 
     url_def = "    # There is no URL since there is no code to download."
     body_def = "    # There is no need for install() since there is no code."
@@ -125,9 +125,9 @@ class PackageTemplate(BundlePackageTemplate):
     def install(self, spec, prefix):
         # FIXME: Unknown build system
         make()
-        make('install')"""
+        make("install")"""
 
-    url_line = '    url      = "{url}"'
+    url_line = '    url = "{url}"'
 
     def __init__(self, name, url, versions):
         super(PackageTemplate, self).__init__(name, versions)
@@ -156,18 +156,18 @@ class AutoreconfPackageTemplate(PackageTemplate):
     base_class_name = "AutotoolsPackage"
 
     dependencies = """\
-    depends_on('autoconf', type='build')
-    depends_on('automake', type='build')
-    depends_on('libtool',  type='build')
-    depends_on('m4',       type='build')
+    depends_on("autoconf", type="build")
+    depends_on("automake", type="build")
+    depends_on("libtool", type="build")
+    depends_on("m4", type="build")
 
     # FIXME: Add additional dependencies if required.
-    # depends_on('foo')"""
+    # depends_on("foo")"""
 
     body_def = """\
     def autoreconf(self, spec, prefix):
         # FIXME: Modify the autoreconf method as necessary
-        autoreconf('--install', '--verbose', '--force')
+        autoreconf("--install", "--verbose", "--force")
 
     def configure_args(self):
         # FIXME: Add arguments other than --prefix
@@ -274,7 +274,7 @@ class BazelPackageTemplate(PackageTemplate):
 
     dependencies = """\
     # FIXME: Add additional dependencies if required.
-    depends_on('bazel', type='build')"""
+    depends_on("bazel", type="build")"""
 
     body_def = """\
     def install(self, spec, prefix):
@@ -289,19 +289,19 @@ class RacketPackageTemplate(PackageTemplate):
 
     url_line = """\
     # FIXME: set the proper location from which to fetch your package
-    git      = "git@github.com:example/example.git"
+    git = "git@github.com:example/example.git"
     """
 
     dependencies = """\
     # FIXME: Add dependencies if required. Only add the racket dependency
     # if you need specific versions. A generic racket dependency is
     # added implicity by the RacketPackage class.
-    # depends_on('racket@8.3:', type=('build', 'run'))"""
+    # depends_on("racket@8.3:", type=("build", "run"))"""
 
     body_def = """\
     # FIXME: specify the name of the package,
     # as it should appear to ``raco pkg install``
-    name = '{0}'
+    name = "{0}"
     # FIXME: set to true if published on pkgs.racket-lang.org
     # pkgs = False
     # FIXME: specify path to the root directory of the
@@ -328,18 +328,18 @@ class PythonPackageTemplate(PackageTemplate):
     # FIXME: Only add the python/pip/wheel dependencies if you need specific versions
     # or need to change the dependency type. Generic python/pip/wheel dependencies are
     # added implicity by the PythonPackage base class.
-    # depends_on('python@2.X:2.Y,3.Z:', type=('build', 'run'))
-    # depends_on('py-pip@X.Y:', type='build')
-    # depends_on('py-wheel@X.Y:', type='build')
+    # depends_on("python@2.X:2.Y,3.Z:", type=("build", "run"))
+    # depends_on("py-pip@X.Y:", type="build")
+    # depends_on("py-wheel@X.Y:", type="build")
 
     # FIXME: Add a build backend, usually defined in pyproject.toml. If no such file
     # exists, use setuptools.
-    # depends_on('py-setuptools', type='build')
-    # depends_on('py-flit-core', type='build')
-    # depends_on('py-poetry-core', type='build')
+    # depends_on("py-setuptools", type="build")
+    # depends_on("py-flit-core", type="build")
+    # depends_on("py-poetry-core", type="build")
 
     # FIXME: Add additional dependencies if required.
-    # depends_on('py-foo', type=('build', 'run'))"""
+    # depends_on("py-foo", type=("build", "run"))"""
 
     body_def = """\
     def global_options(self, spec, prefix):
@@ -397,7 +397,7 @@ class PythonPackageTemplate(PackageTemplate):
                     project = parse_name(url)
                     url = "/".join([project, match.group(4)])
 
-                self.url_line = '    pypi     = "{url}"'
+                self.url_line = '    pypi = "{url}"'
         else:
             # Add a reminder about spack preferring PyPI URLs
             self.url_line = (
@@ -418,7 +418,7 @@ class RPackageTemplate(PackageTemplate):
 
     dependencies = """\
     # FIXME: Add dependencies if required.
-    # depends_on('r-foo', type=('build', 'run'))"""
+    # depends_on("r-foo", type=("build", "run"))"""
 
     body_def = """\
     def configure_args(self):
@@ -440,12 +440,12 @@ class RPackageTemplate(PackageTemplate):
 
         if cran:
             url = r_name
-            self.url_line = '    cran     = "{url}"'
+            self.url_line = '    cran = "{url}"'
 
         bioc = re.search(r"(?:bioconductor)[^/]+/packages" + "/([^/]+)" * 5, url)
 
         if bioc:
-            self.url_line = '    url      = "{0}"\n' '    bioc     = "{1}"'.format(url, r_name)
+            self.url_line = '    url = "{0}"\n' '    bioc = "{1}"'.format(url, r_name)
 
         super(RPackageTemplate, self).__init__(name, url, *args, **kwargs)
 
@@ -458,7 +458,7 @@ class PerlmakePackageTemplate(PackageTemplate):
 
     dependencies = """\
     # FIXME: Add dependencies if required:
-    # depends_on('perl-foo', type=('build', 'run'))"""
+    # depends_on("perl-foo", type=("build", "run"))"""
 
     body_def = """\
     def configure_args(self):
@@ -482,10 +482,10 @@ class PerlbuildPackageTemplate(PerlmakePackageTemplate):
     that come with a Build.PL instead of a Makefile.PL"""
 
     dependencies = """\
-    depends_on('perl-module-build', type='build')
+    depends_on("perl-module-build", type="build")
 
     # FIXME: Add additional dependencies if required:
-    # depends_on('perl-foo', type=('build', 'run'))"""
+    # depends_on("perl-foo", type=("build", "run"))"""
 
 
 class OctavePackageTemplate(PackageTemplate):
@@ -494,10 +494,10 @@ class OctavePackageTemplate(PackageTemplate):
     base_class_name = "OctavePackage"
 
     dependencies = """\
-    extends('octave')
+    extends("octave")
 
     # FIXME: Add additional dependencies if required.
-    # depends_on('octave-foo', type=('build', 'run'))"""
+    # depends_on("octave-foo", type=("build", "run"))"""
 
     def __init__(self, name, *args, **kwargs):
         # If the user provided `--name octave-splines`, don't rename it
@@ -519,8 +519,8 @@ class RubyPackageTemplate(PackageTemplate):
     # FIXME: Add dependencies if required. Only add the ruby dependency
     # if you need specific versions. A generic ruby dependency is
     # added implicity by the RubyPackage class.
-    # depends_on('ruby@X.Y.Z:', type=('build', 'run'))
-    # depends_on('ruby-foo', type=('build', 'run'))"""
+    # depends_on("ruby@X.Y.Z:", type=("build", "run"))
+    # depends_on("ruby-foo", type=("build", "run"))"""
 
     body_def = """\
     def build(self, spec, prefix):
@@ -547,8 +547,9 @@ class MakefilePackageTemplate(PackageTemplate):
     def edit(self, spec, prefix):
         # FIXME: Edit the Makefile if necessary
         # FIXME: If not needed delete this function
-        # makefile = FileFilter('Makefile')
-        # makefile.filter('CC = .*', 'CC = cc')"""
+        # makefile = FileFilter("Makefile")
+        # makefile.filter("CC = .*", "CC = cc")
+        pass"""
 
 
 class IntelPackageTemplate(PackageTemplate):
@@ -732,39 +733,39 @@ class BuildSystemGuesser:
                 break
 
 
-def get_name(args):
+def get_name(name, url):
     """Get the name of the package based on the supplied arguments.
 
     If a name was provided, always use that. Otherwise, if a URL was
     provided, extract the name from that. Otherwise, use a default.
 
     Args:
-        args (argparse.Namespace): The arguments given to
-            ``spack create``
+        name (str): explicit ``--name`` argument given to ``spack create``
+        url (str): ``url`` argument given to ``spack create``
 
     Returns:
         str: The name of the package
     """
 
     # Default package name
-    name = "example"
+    result = "example"
 
-    if args.name is not None:
+    if name is not None:
         # Use a user-supplied name if one is present
-        name = args.name
-        if len(args.name.strip()) > 0:
-            tty.msg("Using specified package name: '{0}'".format(name))
+        result = name
+        if len(name.strip()) > 0:
+            tty.msg("Using specified package name: '{0}'".format(result))
         else:
             tty.die("A package name must be provided when using the option.")
-    elif args.url is not None:
+    elif url is not None:
         # Try to guess the package name based on the URL
         try:
-            name = parse_name(args.url)
-            if name != args.url:
+            result = parse_name(url)
+            if result != url:
                 desc = "URL"
             else:
                 desc = "package name"
-            tty.msg("This looks like a {0} for {1}".format(desc, name))
+            tty.msg("This looks like a {0} for {1}".format(desc, result))
         except UndetectableNameError:
             tty.die(
                 "Couldn't guess a name for this package.",
@@ -772,34 +773,28 @@ def get_name(args):
                 "  `spack create --name <name> <url>`",
             )
 
-    name = simplify_name(name)
+    result = simplify_name(result)
 
-    if not valid_fully_qualified_module_name(name):
+    if not valid_fully_qualified_module_name(result):
         tty.die("Package name can only contain a-z, 0-9, and '-'")
 
-    return name
+    return result
 
 
-def get_url(args):
+def get_url(url):
     """Get the URL to use.
 
     Use a default URL if none is provided.
 
     Args:
-        args (argparse.Namespace): The arguments given to ``spack create``
+        url (str): ``url`` argument to ``spack create``
 
     Returns:
         str: The URL of the package
     """
 
-    # Default URL
-    url = "https://www.example.com/example-1.2.3.tar.gz"
-
-    if args.url:
-        # Use a user-supplied URL if one is present
-        url = args.url
-
-    return url
+    # Use the user-supplied URL or a default URL if none is present.
+    return url or "https://www.example.com/example-1.2.3.tar.gz"
 
 
 def get_versions(args, name):
@@ -820,12 +815,12 @@ def get_versions(args, name):
     # Default version with hash
     hashed_versions = """\
     # FIXME: Add proper versions and checksums here.
-    # version('1.2.3', '0123456789abcdef0123456789abcdef')"""
+    # version("1.2.3", "0123456789abcdef0123456789abcdef")"""
 
     # Default version without hash
     unhashed_versions = """\
     # FIXME: Add proper versions here.
-    # version('1.2.4')"""
+    # version("1.2.4")"""
 
     # Default guesser
     guesser = BuildSystemGuesser()
@@ -865,7 +860,7 @@ def get_versions(args, name):
     return versions, guesser
 
 
-def get_build_system(args, guesser):
+def get_build_system(template, url, guesser):
     """Determine the build system template.
 
     If a template is specified, always use that. Otherwise, if a URL
@@ -873,6 +868,8 @@ def get_build_system(args, guesser):
     build system it uses. Otherwise, use a generic template by default.
 
     Args:
+        template (str): ``--template`` argument given to ``spack create``
+        url (str): ``url`` argument given to ``spack create``
         args (argparse.Namespace): The arguments given to ``spack create``
         guesser (BuildSystemGuesser): The first_stage_function given to
             ``spack checksum`` which records the build system it detects
@@ -881,22 +878,22 @@ def get_build_system(args, guesser):
         str: The name of the build system template to use
     """
     # Default template
-    template = "generic"
+    selected_template = "generic"
 
-    if args.template is not None:
+    if template is not None:
+        selected_template = template
         # Use a user-supplied template if one is present
-        template = args.template
-        tty.msg("Using specified package template: '{0}'".format(template))
-    elif args.url is not None:
+        tty.msg("Using specified package template: '{0}'".format(selected_template))
+    elif url is not None:
         # Use whatever build system the guesser detected
-        template = guesser.build_system
-        if template == "generic":
+        selected_template = guesser.build_system
+        if selected_template == "generic":
             tty.warn("Unable to detect a build system. " "Using a generic package template.")
         else:
             msg = "This package looks like it uses the {0} build system"
-            tty.msg(msg.format(template))
+            tty.msg(msg.format(selected_template))
 
-    return template
+    return selected_template
 
 
 def get_repository(args, name):
@@ -945,10 +942,10 @@ def get_repository(args, name):
 
 def create(parser, args):
     # Gather information about the package to be created
-    name = get_name(args)
-    url = get_url(args)
+    name = get_name(args.name, args.url)
+    url = get_url(args.url)
     versions, guesser = get_versions(args, name)
-    build_system = get_build_system(args, guesser)
+    build_system = get_build_system(args.template, url, guesser)
 
     # Create the package template object
     constr_args = {"name": name, "versions": versions}
diff --git a/lib/spack/spack/test/cmd/create.py b/lib/spack/spack/test/cmd/create.py
index 39d3ab7bd7..2a0943dc5e 100644
--- a/lib/spack/spack/test/cmd/create.py
+++ b/lib/spack/spack/test/cmd/create.py
@@ -3,7 +3,6 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
-import argparse
 import os
 
 import pytest
@@ -12,18 +11,11 @@ import spack.cmd.create
 import spack.util.editor
 from spack.main import SpackCommand
 from spack.url import UndetectableNameError
+from spack.util.executable import which
 
 create = SpackCommand("create")
 
 
-@pytest.fixture(scope="module")
-def parser():
-    """Returns the parser for the module"""
-    prs = argparse.ArgumentParser()
-    spack.cmd.create.setup_parser(prs)
-    return prs
-
-
 @pytest.mark.parametrize(
     "args,name,expected",
     [
@@ -41,7 +33,7 @@ def parser():
             "test-autoreconf",
             [
                 r"TestAutoreconf(AutotoolsPackage)",
-                r"depends_on('autoconf",
+                r'depends_on("autoconf',
                 r"def autoreconf(self",
                 r"def configure_args(self",
             ],
@@ -54,7 +46,7 @@ def parser():
         (
             ["-t", "bazel", "/test-bazel"],
             "test-bazel",
-            [r"TestBazel(Package)", r"depends_on('bazel", r"bazel()"],
+            [r"TestBazel(Package)", r'depends_on("bazel', r"bazel()"],
         ),
         (["-t", "bundle", "/test-bundle"], "test-bundle", [r"TestBundle(BundlePackage)"]),
         (
@@ -80,28 +72,28 @@ def parser():
         (
             ["-t", "octave", "/test-octave"],
             "octave-test-octave",
-            [r"OctaveTestOctave(OctavePackage)", r"extends('octave", r"depends_on('octave"],
+            [r"OctaveTestOctave(OctavePackage)", r'extends("octave', r'depends_on("octave'],
         ),
         (
             ["-t", "perlbuild", "/test-perlbuild"],
             "perl-test-perlbuild",
             [
                 r"PerlTestPerlbuild(PerlPackage)",
-                r"depends_on('perl-module-build",
+                r'depends_on("perl-module-build',
                 r"def configure_args(self",
             ],
         ),
         (
             ["-t", "perlmake", "/test-perlmake"],
             "perl-test-perlmake",
-            [r"PerlTestPerlmake(PerlPackage)", r"depends_on('perl-", r"def configure_args(self"],
+            [r"PerlTestPerlmake(PerlPackage)", r'depends_on("perl-', r"def configure_args(self"],
         ),
         (
             ["-t", "python", "/test-python"],
             "py-test-python",
             [
                 r"PyTestPython(PythonPackage)",
-                r"depends_on('py-",
+                r'depends_on("py-',
                 r"def global_options(self",
                 r"def install_options(self",
             ],
@@ -114,7 +106,7 @@ def parser():
         (
             ["-t", "r", "/test-r"],
             "r-test-r",
-            [r"RTestR(RPackage)", r"depends_on('r-", r"def configure_args(self"],
+            [r"RTestR(RPackage)", r'depends_on("r-', r"def configure_args(self"],
         ),
         (
             ["-t", "scons", "/test-scons"],
@@ -129,21 +121,26 @@ def parser():
         (["-t", "waf", "/test-waf"], "test-waf", [r"TestWaf(WafPackage)", r"configure_args()"]),
     ],
 )
-def test_create_template(parser, mock_test_repo, args, name, expected):
+def test_create_template(mock_test_repo, args, name, expected):
     """Test template creation."""
     repo, repodir = mock_test_repo
 
-    constr_args = parser.parse_args(["--skip-editor"] + args)
-    spack.cmd.create.create(parser, constr_args)
+    create("--skip-editor", *args)
 
     filename = repo.filename_for_package_name(name)
     assert os.path.exists(filename)
 
     with open(filename, "r") as package_file:
-        content = " ".join(package_file.readlines())
+        content = package_file.read()
         for entry in expected:
             assert entry in content
 
+    black = which("black", required=False)
+    if not black:
+        pytest.skip("checking blackness of `spack create` output requires black")
+
+    black("--check", "--diff", filename)
+
 
 @pytest.mark.parametrize(
     "name,expected",
@@ -152,17 +149,14 @@ def test_create_template(parser, mock_test_repo, args, name, expected):
         ("bad#name", "name can only contain"),
     ],
 )
-def test_create_template_bad_name(parser, mock_test_repo, name, expected, capsys):
+def test_create_template_bad_name(mock_test_repo, name, expected):
     """Test template creation with bad name options."""
-    constr_args = parser.parse_args(["--skip-editor", "-n", name])
-    with pytest.raises(SystemExit):
-        spack.cmd.create.create(parser, constr_args)
-
-    captured = capsys.readouterr()
-    assert expected in str(captured)
+    output = create("--skip-editor", "-n", name, fail_on_error=False)
+    assert expected in output
+    assert create.returncode != 0
 
 
-def test_build_system_guesser_no_stage(parser):
+def test_build_system_guesser_no_stage():
     """Test build system guesser when stage not provided."""
     guesser = spack.cmd.create.BuildSystemGuesser()
 
@@ -171,7 +165,7 @@ def test_build_system_guesser_no_stage(parser):
         guesser(None, "/the/url/does/not/matter")
 
 
-def test_build_system_guesser_octave(parser):
+def test_build_system_guesser_octave():
     """
     Test build system guesser for the special case, where the same base URL
     identifies the build system rather than guessing the build system from
@@ -185,8 +179,7 @@ def test_build_system_guesser_octave(parser):
     assert guesser.build_system == expected
 
     # Also ensure get the correct template
-    args = parser.parse_args([url])
-    bs = spack.cmd.create.get_build_system(args, guesser)
+    bs = spack.cmd.create.get_build_system(None, url, guesser)
     assert bs == expected
 
 
@@ -197,14 +190,13 @@ def test_build_system_guesser_octave(parser):
         ("file://example.com/archive.tar.gz", "archive"),
     ],
 )
-def test_get_name_urls(parser, url, expected):
+def test_get_name_urls(url, expected):
     """Test get_name with different URLs."""
-    args = parser.parse_args([url])
-    name = spack.cmd.create.get_name(args)
+    name = spack.cmd.create.get_name(None, url)
     assert name == expected
 
 
-def test_get_name_error(parser, monkeypatch, capsys):
+def test_get_name_error(monkeypatch, capsys):
     """Test get_name UndetectableNameError exception path."""
 
     def _parse_name_offset(path, v):
@@ -213,15 +205,13 @@ def test_get_name_error(parser, monkeypatch, capsys):
     monkeypatch.setattr(spack.url, "parse_name_offset", _parse_name_offset)
 
     url = "downloads.sourceforge.net/noapp/"
-    args = parser.parse_args([url])
 
     with pytest.raises(SystemExit):
-        spack.cmd.create.get_name(args)
+        spack.cmd.create.get_name(None, url)
     captured = capsys.readouterr()
     assert "Couldn't guess a name" in str(captured)
 
 
-def test_no_url(parser):
+def test_no_url():
     """Test creation of package without a URL."""
-    args = parser.parse_args(["--skip-editor", "-n", "create-new-package"])
-    spack.cmd.create.create(parser, args)
+    create("--skip-editor", "-n", "create-new-package")