Add style tool to fix fish file formatting (#39155)

3 files changed, 37 insertions, 13 deletions

diff --git a/lib/spack/spack/bootstrap/environment.py b/lib/spack/spack/bootstrap/environment.py
index a2086160f6..96ec527a8a 100644
--- a/lib/spack/spack/bootstrap/environment.py
+++ b/lib/spack/spack/bootstrap/environment.py
@@ -37,6 +37,7 @@ class BootstrapEnvironment(spack.environment.Environment):
             mypy_root_spec(),
             black_root_spec(),
             flake8_root_spec(),
+            fish_root_spec(),
             pytest_root_spec(),
         ]
 
@@ -179,6 +180,12 @@ def flake8_root_spec() -> str:
     return _root_spec("py-flake8@3.8.2:")
 
 
+def fish_root_spec() -> str:
+    """Return the root spec used to bootstrap fish"""
+    # fish 3.2.0 introduces the `--check` flag to `fish_indent`
+    return _root_spec("fish@3.2:")
+
+
 def pytest_root_spec() -> str:
     """Return the root spec used to bootstrap flake8"""
     return _root_spec("py-pytest@6.2.4:")
diff --git a/lib/spack/spack/cmd/style.py b/lib/spack/spack/cmd/style.py
index adc880f1bd..9cd1458af7 100644
--- a/lib/spack/spack/cmd/style.py
+++ b/lib/spack/spack/cmd/style.py
@@ -36,7 +36,7 @@ exclude_directories = [os.path.relpath(spack.paths.external_path, spack.paths.pr
 #: double-check the results of other tools (if, e.g., --fix was provided)
 #: The list maps an executable name to a method to ensure the tool is
 #: bootstrapped or present in the environment.
-tool_names = ["isort", "black", "flake8", "mypy"]
+tool_names = ["isort", "black", "flake8", "mypy", "fish_indent"]
 
 #: tools we run in spack style
 tools = {}
@@ -61,12 +61,13 @@ def is_package(f):
 
 #: decorator for adding tools to the list
 class tool:
-    def __init__(self, name, required=False):
+    def __init__(self, name, required=False, suffix=".py"):
         self.name = name
         self.required = required
+        self.suffix = suffix
 
     def __call__(self, fun):
-        tools[self.name] = (fun, self.required)
+        tools[self.name] = (fun, self.required, self.suffix)
         return fun
 
 
@@ -121,12 +122,8 @@ def changed_files(base="develop", untracked=True, all_files=False, root=None):
         files = git(*arg_list, output=str).split("\n")
 
         for f in files:
-            # Ignore non-Python files
-            if not (f.endswith(".py") or f == "bin/spack"):
-                continue
-
             # Ignore files in the exclude locations
-            if any(os.path.realpath(f).startswith(e) for e in excludes):
+            if not f or any(os.path.realpath(f).startswith(e) for e in excludes):
                 continue
 
             changed.add(f)
@@ -352,6 +349,22 @@ def run_black(black_cmd, file_list, args):
     return returncode
 
 
+@tool("fish_indent", suffix=".fish")
+def run_fish_indent(fish_indent_cmd, file_list, args):
+    if args.fix:
+        fish_indent_args = ["--write"]
+    else:
+        fish_indent_args = ["--check"]
+
+    output = fish_indent_cmd(*fish_indent_args, *file_list, fail_on_error=False, output=str)
+    returncode = fish_indent_cmd.returncode
+
+    rewrite_and_print_output(output, args)
+    print_tool_result("fish_indent", returncode)
+
+    return returncode
+
+
 def validate_toolset(arg_value):
     """Validate --tool and --skip arguments (sets of optionally comma-separated tools)."""
     tools = set(",".join(arg_value).split(","))  # allow args like 'isort,flake8'
@@ -417,9 +430,11 @@ def style(parser, args):
 
         print_style_header(file_list, args, tools_to_run)
         for tool_name in tools_to_run:
-            run_function, required = tools[tool_name]
+            run_function, required, suffix = tools[tool_name]
             print_tool_header(tool_name)
-            return_code |= run_function(which(tool_name), file_list, args)
+            file_subset = [f for f in file_list if f.endswith(suffix)]
+            if file_subset:
+                return_code |= run_function(which(tool_name), file_subset, args)
 
     if return_code == 0:
         tty.msg(color.colorize("@*{spack style checks were clean}"))
diff --git a/lib/spack/spack/test/cmd/style.py b/lib/spack/spack/test/cmd/style.py
index 5591116968..5b86fc8aac 100644
--- a/lib/spack/spack/test/cmd/style.py
+++ b/lib/spack/spack/test/cmd/style.py
@@ -56,7 +56,7 @@ def flake8_package_with_errors(scope="function"):
     """A flake8 package with errors."""
     repo = spack.repo.Repo(spack.paths.mock_packages_path)
     filename = repo.filename_for_package_name("flake8")
-    tmp = filename + ".tmp"
+    tmp = filename.replace("package.py", "package2.py")
 
     shutil.copy(filename, tmp)
     package = FileFilter(tmp)
@@ -64,11 +64,12 @@ def flake8_package_with_errors(scope="function"):
     # this is a black error (quote style and spacing before/after operator)
     package.filter('state = "unmodified"', "state    =    'modified'", string=True)
 
-    # this is an isort error (orderign) and a flake8 error (unused import)
+    # this is an isort error (ordering) and a flake8 error (unused import)
     package.filter(
         "from spack.package import *", "from spack.package import *\nimport os", string=True
     )
     yield tmp
+    os.remove(tmp)
 
 
 def test_changed_files_from_git_rev_base(git, tmpdir, capfd):
@@ -213,6 +214,7 @@ def test_fix_style(external_style_root):
 @pytest.mark.skipif(not which("isort"), reason="isort is not installed.")
 @pytest.mark.skipif(not which("mypy"), reason="mypy is not installed.")
 @pytest.mark.skipif(not which("black"), reason="black is not installed.")
+@pytest.mark.skipif(not which("fish_indent"), reason="fish is not installed.")
 def test_external_root(external_style_root, capfd):
     """Ensure we can run in a separate root directory w/o configuration files."""
     tmpdir, py_file = external_style_root
@@ -285,5 +287,5 @@ def test_style_with_black(flake8_package_with_errors):
 
 
 def test_skip_tools():
-    output = style("--skip", "isort,mypy,black,flake8")
+    output = style("--skip", "isort,mypy,black,flake8,fish_indent")
     assert "Nothing to run" in output