feat(linter): added --statistics flag to print summary of linter findings

closes #389

.pre-commit-config.yaml

@@ -5,13 +5,13 @@ exclude: >
   )
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.1.0
+  rev: v4.3.0
   hooks:
   - id: trailing-whitespace
   - id: end-of-file-fixer
   - id: check-yaml
 - repo: https://github.com/myint/autoflake
-  rev: v1.4
+  rev: v1.6.0
   hooks:
   - id: autoflake
     exclude: &fixtures tests/functional/|tests/input|tests/extensions/data|tests/regrtest_data/|tests/data/
@@ -22,7 +22,7 @@ repos:
     - --remove-duplicate-keys
     - --remove-unused-variables
 - repo: https://github.com/asottile/pyupgrade
-  rev: v2.31.0
+  rev: v2.38.0
   hooks:
   - id: pyupgrade
     args: [--py36-plus]
@@ -33,11 +33,11 @@ repos:
     exclude: docs*
     additional_dependencies: [toml]
 - repo: https://github.com/psf/black
-  rev: 22.1.0
+  rev: 22.8.0
   hooks:
   - id: black
 - repo: https://github.com/macisamuele/language-formatters-pre-commit-hooks
-  rev: v2.2.0
+  rev: v2.4.0
   hooks:
   - id: pretty-format-ini
     args: [--autofix]

docs/src/docs/getting-started.md

@@ -49,7 +49,9 @@ Options:
   --preserve-blank-lines    Attempt to preserve blank lines.
   --format-css              Also format contents of <style> tags.
   --format-js               Also format contents of <script> tags.
-  --configuration           Path to global configuration file in .djlintrc format
+  --configuration PATH      Path to global configuration file in .djlintrc format
+  --statistics              Count the number of occurrences of each
+                            error/warning code.
   -h, --help                Show this message and exit.
 ```
 

docs/src/fr/docs/getting-started.md

@@ -49,7 +49,9 @@ Options:
   --preserve-blank-lines    Attempt to preserve blank lines.
   --format-css              Also format contents of <style> tags.
   --format-js               Also format contents of <script> tags.
-  --configuration           Path to global configuration file in .djlintrc format
+  --configuration PATH      Path to global configuration file in .djlintrc format
+  --statistics              Count the number of occurrences of each
+                            error/warning code.
   -h, --help                Show this message and exit.
 ```
 

docs/src/ru/docs/getting-started.md

@@ -49,7 +49,9 @@ Options:
   --preserve-blank-lines    Attempt to preserve blank lines.
   --format-css              Also format contents of <style> tags.
   --format-js               Also format contents of <script> tags.
-  --configuration           Path to global configuration file in .djlintrc format
+  --configuration PATH      Path to global configuration file in .djlintrc format
+  --statistics              Count the number of occurrences of each
+                            error/warning code.
   -h, --help                Show this message and exit.
 ```
 

src/djlint/__init__.py

@@ -122,6 +122,11 @@ from .src import get_src
     required=False,
     help="Path to global configuration file in .djlintrc format",
 )
+@click.option(
+    "--statistics",
+    is_flag=True,
+    help="Count the number of occurrences of each error/warning code.",
+)
 @colorama_text(autoreset=True)
 def main(
     src: List[str],
@@ -141,6 +146,7 @@ def main(
     format_css: bool,
     format_js: bool,
     configuration: Optional[str],
+    statistics: bool,
 ) -> None:
     """djLint · HTML template linter and formatter."""
     config = Config(
@@ -161,6 +167,7 @@ def main(
         format_css=format_css,
         format_js=format_js,
         configuration=configuration,
+        statistics=statistics,
     )
 
     temp_file = None

src/djlint/output.py

@@ -1,7 +1,8 @@
 """Build djLint console output."""
 import shutil
+from collections import Counter
 from pathlib import Path
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional
 
 import regex as re
 from click import echo
@@ -33,14 +34,22 @@ def print_output(
     if config.stdin is False or config.lint:
         echo()
 
-    for error in sorted(file_errors, key=lambda x: next(iter(list(x.values())[0]))):
-        if error.get("format_message") and config.stdin is False:
-            # reformat message
-            format_error_count += build_check_output(error["format_message"], config)
+    if config.statistics:
+        lint_error_count = build_stats_output(
+            [x.get("lint_message") for x in file_errors], config
+        )
 
-        if error.get("lint_message"):
-            # lint message
-            lint_error_count += build_output(error["lint_message"], config)
+    else:
+        for error in sorted(file_errors, key=lambda x: next(iter(list(x.values())[0]))):
+            if error.get("format_message") and config.stdin is False:
+                # reformat message
+                format_error_count += build_check_output(
+                    error["format_message"], config
+                )
+
+            if error.get("lint_message"):
+                # lint message
+                lint_error_count += build_output(error["lint_message"], config)
 
     tense_message = (
         build_quantity(format_error_count) + " would be"
@@ -180,3 +189,37 @@ def build_quantity_tense(size: int) -> str:
         + " "
         + ("were" if size > 1 or size == 0 else "was")
     )
+
+
+def build_stats_output(errors: List[Optional[Any]], config: Config) -> int:
+    """Build output for linter statistics."""
+    if len(errors) == 0:
+        return 0
+
+    codes = []
+    for error in errors:
+        if error:
+            for code in list(error.values())[0]:
+                codes.append(code["code"])
+
+    messages = {
+        rule["rule"]["name"]: rule["rule"]["message"] for rule in config.linter_rules
+    }
+
+    if messages and codes:
+
+        longest_code = len(max(messages.keys(), key=len))
+        longest_count = len(
+            str(max(Counter(codes).values(), key=lambda x: len(str(x))))
+        )
+
+        for code in sorted(Counter(codes).items()):
+
+            code_space = (longest_code - len(str(code[0]))) * " "
+            count_space = (longest_count - len(str(code[1]))) * " "
+
+            echo(
+                f"{Fore.YELLOW}{code[0]}{Fore.BLUE} {code_space}{code[1]}{Style.RESET_ALL} {count_space}{messages[code[0]]}"
+            )
+
+    return sum(Counter(codes).values())

src/djlint/settings.py

@@ -206,6 +206,7 @@ class Config:
         format_css: bool = False,
         format_js: bool = False,
         configuration: Optional[str] = None,
+        statistics: bool = False,
     ):
 
         self.reformat = reformat
@@ -306,6 +307,8 @@ class Config:
             )
         )
 
+        self.statistics = statistics
+
         # base options
         default_indent = 4
         if not indent:

tests/test_linter/test_linter.py

@@ -954,3 +954,17 @@ def test_ignoring_rules(runner: CliRunner, tmp_file: TextIO) -> None:
     )
     result = runner.invoke(djlint, [tmp_file.name])
     assert "H006" not in result.output
+
+
+def test_statistics_empty(runner: CliRunner, tmp_file: TextIO) -> None:
+    write_to_file(tmp_file.name, b"")
+    result = runner.invoke(djlint, [tmp_file.name, "--statistics"])
+
+    assert result.exit_code == 0
+
+
+def test_statistics_with_results(runner: CliRunner, tmp_file: TextIO) -> None:
+    write_to_file(tmp_file.name, b"<div>")
+    result = runner.invoke(djlint, [tmp_file.name, "--statistics"])
+
+    assert result.exit_code == 1