Implement --template-tags CLI flag

curlylint/cli.py

@@ -1,11 +1,22 @@
 import re
 from functools import partial
 from pathlib import Path
-from typing import Any, Dict, Mapping, Optional, Pattern, Set, Tuple, Union
+from typing import (
+    Any,
+    Dict,
+    List,
+    Mapping,
+    Optional,
+    Pattern,
+    Set,
+    Tuple,
+    Union,
+)
 
 import click  # lgtm [py/import-and-import-from]
 
 from curlylint.rule_param import RULE
+from curlylint.template_tags_param import TEMPLATE_TAGS
 
 from . import __version__
 from .config import (
@@ -122,6 +133,15 @@ def path_empty(
     ),
     multiple=True,
 )
+@click.option(
+    "--template-tags",
+    type=TEMPLATE_TAGS,
+    default="[]",
+    help=(
+        'Specify additional sets of template tags, with the syntax --template-tags \'[["cache", "endcache"]]\'. '
+    ),
+    show_default=True,
+)
 @click.argument(
     "src",
     nargs=-1,
@@ -161,6 +181,7 @@ def main(
     include: str,
     exclude: str,
     rule: Union[Mapping[str, Any], Tuple[Mapping[str, Any], ...]],
+    template_tags: List[List[str]],
     src: Tuple[str, ...],
 ) -> None:
     """Prototype linter for Jinja and Django templates, forked from jinjalint"""
@@ -236,6 +257,7 @@ def main(
     configuration["rules"] = rules
     configuration["verbose"] = verbose
     configuration["parse_only"] = parse_only
+    configuration["template_tags"] = template_tags
 
     if stdin_filepath:
         configuration["stdin_filepath"] = Path(stdin_filepath)

curlylint/cli_test.py

@@ -1,37 +1,53 @@
 import unittest
 
 from io import BytesIO
+from typing import List
 
 from curlylint.tests.utils import BlackRunner
 
 from curlylint.cli import main
 
 
-class TestParser(unittest.TestCase):
-    def test_no_flag(self):
+class TestCLI(unittest.TestCase):
+    """
+    Heavily inspired by Black’s CLI tests.
+    See https://github.com/psf/black/blob/master/tests/test_black.py.
+    """
+
+    def invoke_curlylint(
+        self, exit_code: int, args: List[str], input: str = None
+    ):
         runner = BlackRunner()
-        result = runner.invoke(main, [])
+        result = runner.invoke(
+            main, args, input=BytesIO(input.encode("utf8")) if input else None
+        )
+        self.assertEqual(
+            result.exit_code,
+            exit_code,
+            msg=(
+                f"Failed with args: {args}\n"
+                f"stdout: {runner.stdout_bytes.decode()!r}\n"
+                f"stderr: {runner.stderr_bytes.decode()!r}\n"
+                f"exception: {result.exception}"
+            ),
+        )
+        return runner
+
+    def test_no_flag(self):
+        runner = self.invoke_curlylint(0, [])
         self.assertEqual(runner.stdout_bytes.decode(), "")
         self.assertEqual(
             runner.stderr_bytes.decode(), "No Path provided. Nothing to do 😴\n"
         )
-        self.assertEqual(result.exit_code, 0)
 
     def test_stdin(self):
-        runner = BlackRunner()
-        result = runner.invoke(
-            main, ["-"], input=BytesIO("<p>Hello, World!</p>".encode("utf8")),
-        )
+        runner = self.invoke_curlylint(0, ["-"], input="<p>Hello, World!</p>")
         self.assertEqual(runner.stdout_bytes.decode(), "")
         self.assertEqual(runner.stderr_bytes.decode(), "All done! ✨ 🍰 ✨\n\n")
-        self.assertEqual(result.exit_code, 0)
 
     def test_stdin_verbose(self):
-        runner = BlackRunner()
-        result = runner.invoke(
-            main,
-            ["--verbose", "-"],
-            input=BytesIO("<p>Hello, World!</p>".encode("utf8")),
+        runner = self.invoke_curlylint(
+            0, ["--verbose", "-"], input="<p>Hello, World!</p>"
         )
         self.assertEqual(runner.stdout_bytes.decode(), "")
         self.assertIn(
@@ -45,14 +61,40 @@ def test_stdin_verbose(self):
 """,
             runner.stderr_bytes.decode(),
         )
-        self.assertEqual(result.exit_code, 0)
 
     def test_flag_help(self):
-        runner = BlackRunner()
-        result = runner.invoke(main, ["--help"])
+        runner = self.invoke_curlylint(0, ["--help"])
         self.assertIn(
             "Prototype linter for Jinja and Django templates",
             runner.stdout_bytes.decode(),
         )
         self.assertEqual(runner.stderr_bytes.decode(), "")
-        self.assertEqual(result.exit_code, 0)
+
+    def test_template_tags_validation_fail_no_nesting(self):
+        runner = self.invoke_curlylint(
+            2,
+            ["--template-tags", '["cache", "endcache"]', "-"],
+            input="<p>Hello, World!</p>",
+        )
+        self.assertIn(
+            "Error: Invalid value for '--template-tags': expected a list of lists of tags as JSON, got '[\"cache\", \"endcache\"]'",
+            runner.stderr_bytes.decode(),
+        )
+
+    def test_template_tags_cli_configured(self):
+        self.invoke_curlylint(
+            0,
+            ["--template-tags", '[["of", "elseof", "endof"]]', "-"],
+            input="<p>{% of a %}c{% elseof %}test{% endof %}</p>",
+        )
+
+    def test_template_tags_cli_unconfigured_fails(self):
+        runner = self.invoke_curlylint(
+            1,
+            ["--template-tags", "[]", "-"],
+            input="<p>{% of a %}c{% elseof %}test{% endof %}</p>",
+        )
+        self.assertIn(
+            "Parse error: expected one of 'autoescape', 'block', 'blocktrans', 'comment', 'filter', 'for', 'if', 'ifchanged', 'ifequal', 'ifnotequal', 'not an intermediate Jinja tag name', 'spaceless', 'verbatim', 'with' at 0:17\tparse_error",
+            runner.stdout_bytes.decode(),
+        )

curlylint/parse.py

@@ -592,6 +592,8 @@ def make_jinja_parser(config, content):
         (names[0], names)
         for names in (
             DEFAULT_JINJA_STRUCTURED_ELEMENTS_NAMES
+            + config.get("template_tags", [])
+            # Deprecated, will be removed in a future release.
             + config.get("jinja_custom_elements_names", [])
         )
     ).values()

curlylint/parse_test.py

@@ -372,25 +372,25 @@ def test_jinja_blocks(self):
         src = "{% if a %}b{% elif %}c{% elif %}d{% else %}e{% endif %}"
         self.assertEqual(src, str(jinja.parse(src)))
 
-    def test_jinja_custom_block_self_closing(self):
+    def test_jinja_custom_tag_self_closing(self):
         self.assertEqual(
-            jinja.parse("{% exampletest %}"),
+            jinja.parse("{% potato %}"),
             JinjaElement(
                 parts=[
                     JinjaElementPart(
-                        tag=JinjaTag(name="exampletest", content=""),
-                        content=None,
+                        tag=JinjaTag(name="potato", content=""), content=None,
                     )
                 ],
                 closing_tag=None,
             ),
         )
 
-    def test_jinja_custom_block_open_close_unconfigured(self):
+    def test_jinja_custom_tag_open_close_unconfigured(self):
         with pytest.raises(P.ParseError):
             jinja.parse("{% of a %}c{% endof %}")
 
-    def test_jinja_custom_block_open_close_configured(self):
+    def test_jinja_custom_tag_open_close_configured_deprecated(self):
+        # Deprecated, will be removed in a future release.
         parser = make_parser({"jinja_custom_elements_names": [["of", "endof"]]})
         jinja = parser["jinja"]
         self.assertEqual(
@@ -406,11 +406,27 @@ def test_jinja_custom_block_open_close_configured(self):
             ),
         )
 
-    def test_jinja_custom_block_open_middle_close_unconfigured(self):
+    def test_jinja_custom_tag_open_close_configured(self):
+        parser = make_parser({"template_tags": [["of", "endof"]]})
+        jinja = parser["jinja"]
+        self.assertEqual(
+            jinja.parse("{% of a %}c{% endof %}"),
+            JinjaElement(
+                parts=[
+                    JinjaElementPart(
+                        tag=JinjaTag(name="of", content="a"),
+                        content=Interp(["c"]),
+                    ),
+                ],
+                closing_tag=JinjaTag(name="endof", content=""),
+            ),
+        )
+
+    def test_jinja_custom_tag_open_middle_close_unconfigured(self):
         with pytest.raises(P.ParseError):
             jinja.parse("{% of a %}b{% elseof %}c{% endof %}")
 
-    def test_jinja_custom_block_open_middle_close(self):
+    def test_jinja_custom_tag_open_middle_close(self):
         parser = make_parser(
             {"jinja_custom_elements_names": [["of", "elseof", "endof"]]}
         )

curlylint/template_tags_param.py

@@ -0,0 +1,35 @@
+import json
+
+import click
+
+
+class TemplateTagsParamType(click.ParamType):
+    """
+    Validates and converts CLI-provided template tags configuration.
+    Expects: --template-tags '[["cache", "endcache"]]'
+    """
+
+    name = "template tags"
+
+    def convert(self, value, param, ctx):
+        try:
+            if isinstance(value, str):
+                template_tags = json.loads(value)
+            else:
+                template_tags = value
+            # Validate the expected list of lists.
+            if not isinstance(template_tags, (list, tuple)):
+                raise ValueError
+            for tags in template_tags:
+                if not isinstance(tags, (list, tuple)):
+                    raise ValueError
+            return template_tags
+        except ValueError:
+            self.fail(
+                f"expected a list of lists of tags as JSON, got {value!r}",
+                param,
+                ctx,
+            )
+
+
+TEMPLATE_TAGS = TemplateTagsParamType()

example_pyproject.toml

@@ -1,8 +1,9 @@
 [tool.curlylint]
 # Specify additional Jinja elements which can wrap HTML here. You
-# don't neet to specify simple elements which can't wrap anything like
+# don’t neet to specify simple elements which can't wrap anything like
 # {% extends %} or {% include %}.
-jinja-custom-elements-names = [
+template_tags = [
+  ["of", "elseof", "endof"],
   ["cache", "endcache"],
   ["captureas", "endcaptureas"]
 ]

website/docs/command-line-usage.md

@@ -81,6 +81,16 @@ curlylint --rule 'html_has_lang: "en"' template-directory/
 curlylint --rule 'html_has_lang: ["en", "en-US"]' template-directory/
 ```
 
+### `--template-tags`
+
+Specify additional sets of template tags, with the syntax `--template-tags '[["start_tag", "end_tag"]]'`. This is only needed for tags that wrap other markup (like `{% block %}<p>Hello!</p>{% endblock %}`), not for single / “void” tags.
+
+🚧 Note the list of lists is formatted as JSON, with each sub-list containing the tags expected to work together as opening/intermediary/closing tags.
+
+```bash
+curlylint --template-tags '[["cache", "endcache"]]' template-directory/
+```
+
 ### `--config`
 
 Read configuration from the provided file.