test: add pytest tests for template validator

Comprehensive test suite covering glob validation, trailing
whitespace detection, duplicate and conflict detection,
coverage analysis, and report formatting.

Signed-off-by: Srikanth Patchava <spatchava@meta.com>

C++.gitignore

@@ -23,7 +23,6 @@
 *.dll
 *.so.*
 
-
 # Fortran module files
 *.mod
 *.smod

Global/Agents.gitignore

@@ -0,0 +1,68 @@
+# AI agents and assistants
+#
+# Some common agent instruction and project configuration files are listed
+# below as commented-out examples. They are often intentionally committed and
+# shared with a team, so only uncomment them if they are local-only in your
+# project.
+
+# GEMINI.md
+# WARP.md
+# CRUSH.md
+# QWEN.md
+
+# OpenAI Codex
+# AGENTS.md
+# .codex/
+
+# Aider
+.aider.input.history
+.aider.chat.history.md
+.aider.llm.history
+.aider.tags.cache.v*
+# .aiderignore
+
+# Claude Code
+.claude/*.local.json
+.claude/**/*.log
+CLAUDE.local.md
+# .claude/
+
+# Gemini CLI
+gemini-debug.log
+.gemini-clipboard/
+# .gemini/
+
+# Cursor AI
+# .cursorrules
+# .cursor/
+# .cursor.json
+# .cursor-settings.yaml
+
+# Continue
+# .continue/
+# .continuerc.json
+
+# Cline
+# .cline/
+# .clinerules
+# cline.json
+
+# Other agent/editor project config
+# .warp/
+# .crush/
+# .codeium/
+# .deepseek/
+# .amazon-codewhisperer/
+# .tabnineignore
+# .tabnine/
+
+# GitHub Copilot
+# .github/copilot-instructions.md
+
+# Windsurf Editor
+# .windsurfrules
+# .windsurf/
+
+# Replit AI Development
+# .replit
+# replit.nix

Global/MATLAB.gitignore

@@ -4,6 +4,7 @@
 *.autosave
 *.slx.r*
 *.mdl.r*
+*.bak
 
 # Derived content-obscured files
 *.p

Lasal.gitignore

@@ -0,0 +1,47 @@
+## LASAL ###
+# website: https://www.sigmatek-automation.com/en/products/engineering-tool-lasal/
+
+# lasal screen/visu runtime folders generated during build
+**/Runtime
+**/BAK
+**/Language
+**/TempPreview
+
+# lasal class runtime folders generated during build
+ProjectInternal
+Internal
+**/Network/*/*.st
+**/Drive/*.st
+
+# bootdisk files
+**/Bootdisk
+
+# various filetypes generated at runtime or used for internal backups
+*.ldi
+*.bak
+*.lob
+*.lba
+*.lcb
+*.lock
+*.plc
+*.7z
+*.zip
+*.lcc
+*.lds
+
+# tag files generated by the compiler
+*.mme
+**/MaeExp.txt
+**/MaeExp.xml
+
+# SigCLib requires lba and lob files
+!cObjLib.lob
+!cObjLib.lba
+
+# opc related classes added automatically from lasal instance
+!**/Class/OPC_UA/**
+!**/Class/OPC_UA_Client/**
+!**/Class/OPC_UA_Server/**
+!**/Class/OPC_UA_ModuleBase/**
+!**/Class/OPC_UA_AddressSpace/**
+!**/Class/OPC_UA_OpenSSL_v1_1_1/**

MoonBit.gitignore

@@ -0,0 +1,53 @@
+# Build System Artifacts
+
+# MoonBit default build output directory.
+_build/
+# Local MoonBit package cache directory.
+.mooncakes/
+
+# Coverage and Test Artifacts
+
+# Coverage reports generated by MoonBit tooling.
+moonbit-coverage-*.txt
+# Coverage output directory used by coverage commands.
+_coverage/
+# Bisect runtime coverage data file.
+bisect.coverage
+
+# JavaScript Target Artifacts
+
+# Uncomment if generated JavaScript should be ignored.
+# *.js
+# Source map files generated for JavaScript output.
+*.js.map
+# Node.js dependencies used in JS target workflows.
+node_modules/
+
+# WebAssembly Target Artifacts
+
+# Compiled WebAssembly binaries.
+*.wasm
+# WebAssembly text format output.
+*.wat
+
+# MoonBit Pilot / Agent Artifacts
+
+# MoonBit agent runtime state and temporary files.
+.moonagent/
+
+# LLVM Backend Artifacts
+
+# LLVM textual intermediate representation (IR) files.
+*.ll
+# LLVM bitcode files.
+*.bc
+# Native object files from LLVM/native compilation.
+*.o
+# Generated assembly source files.
+*.s
+# Default executable output name on Unix-like systems.
+*.out
+# Native executable output on Windows.
+*.exe
+# macOS debug symbol bundles.
+*.dSYM/

community/Embedded/ZephyrRTOS.gitignore

@@ -0,0 +1,27 @@
+# Zephyr RTOS build artifacts
+/build/
+/twister-out*/
+
+# Generated configuration files
+*.config
+*.config.old
+/zephyr/.config
+
+# Device tree generated files
+*.dts.pre.tmp
+*.dts_compiled
+
+# Kconfig generated
+autoconf.h
+
+# West workspace
+/.west/
+
+# Python virtual environment
+/.venv/
+/venv/
+
+# IDE
+.vscode/launch.json
+.vscode/tasks.json
+*.jlink

scripts/strip_trailing_whitespace.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+"""
+Strip trailing whitespace from .gitignore template files.
+
+This script fixes trailing whitespace issues in gitignore templates,
+which can cause unexpected behavior in pattern matching.
+"""
+
+import argparse
+import os
+import sys
+
+
+def strip_file(filepath: str, dry_run: bool = False) -> int:
+    """Strip trailing whitespace from a file. Returns number of lines fixed."""
+    with open(filepath, "r", encoding="utf-8", errors="replace") as f:
+        lines = f.readlines()
+
+    fixed_count = 0
+    new_lines = []
+    for line in lines:
+        stripped = line.rstrip() + "\n"
+        if stripped != line:
+            fixed_count += 1
+        new_lines.append(stripped)
+
+    # Ensure file ends with a single newline
+    if new_lines and new_lines[-1] == "\n":
+        pass  # already ends properly
+    elif not new_lines:
+        new_lines = ["\n"]
+
+    if fixed_count > 0 and not dry_run:
+        with open(filepath, "w", encoding="utf-8", newline="") as f:
+            f.writelines(new_lines)
+
+    return fixed_count
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Strip trailing whitespace from .gitignore templates."
+    )
+    parser.add_argument("files", nargs="*", help="Files to process.")
+    parser.add_argument("--repo-root", default=".", help="Repo root directory.")
+    parser.add_argument(
+        "--dry-run", action="store_true", help="Report but do not modify files."
+    )
+    args = parser.parse_args()
+
+    if args.files:
+        targets = args.files
+    else:
+        targets = []
+        for entry in os.listdir(args.repo_root):
+            full = os.path.join(args.repo_root, entry)
+            if os.path.isfile(full) and entry.endswith(".gitignore"):
+                targets.append(full)
+
+    total_fixed = 0
+    for filepath in targets:
+        count = strip_file(filepath, dry_run=args.dry_run)
+        if count > 0:
+            action = "would fix" if args.dry_run else "fixed"
+            print(f"  {action} {count} line(s) in {filepath}")
+            total_fixed += count
+
+    if total_fixed == 0:
+        print("No trailing whitespace found.")
+    else:
+        action = "Would fix" if args.dry_run else "Fixed"
+        print(f"\n{action} {total_fixed} line(s) total.")
+
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()

scripts/test_validate_templates.py

@@ -0,0 +1,189 @@
+#!/usr/bin/env python3
+"""Tests for the gitignore template validator."""
+
+import os
+import tempfile
+import pytest
+
+from validate_templates import (
+    Issue,
+    Severity,
+    ValidationReport,
+    analyze_coverage,
+    check_trailing_whitespace,
+    discover_templates,
+    find_conflicts,
+    find_duplicates,
+    format_report,
+    is_valid_glob_pattern,
+    validate_template,
+)
+
+
+class TestIsValidGlobPattern:
+    def test_simple_extension(self):
+        assert is_valid_glob_pattern("*.py") is True
+
+    def test_directory_pattern(self):
+        assert is_valid_glob_pattern("build/") is True
+
+    def test_negation(self):
+        assert is_valid_glob_pattern("!important.txt") is True
+
+    def test_double_star(self):
+        assert is_valid_glob_pattern("**/logs") is True
+
+    def test_bracket_pattern(self):
+        assert is_valid_glob_pattern("*.[oa]") is True
+
+    def test_unmatched_bracket(self):
+        assert is_valid_glob_pattern("*.[o") is False
+
+    def test_empty_after_strip(self):
+        assert is_valid_glob_pattern("!") is False
+
+    def test_rooted_pattern(self):
+        assert is_valid_glob_pattern("/build") is True
+
+
+class TestCheckTrailingWhitespace:
+    def test_no_trailing(self):
+        assert check_trailing_whitespace("*.py", 1) is None
+
+    def test_with_trailing_space(self):
+        issue = check_trailing_whitespace("*.py ", 5)
+        assert issue is not None
+        assert issue.severity == Severity.WARNING
+        assert issue.line_number == 5
+
+    def test_blank_line_ignored(self):
+        assert check_trailing_whitespace("   ", 1) is None
+
+
+class TestFindDuplicates:
+    def test_no_duplicates(self):
+        patterns = [(1, "*.py"), (2, "*.js"), (3, "build/")]
+        assert find_duplicates(patterns) == []
+
+    def test_exact_duplicate(self):
+        patterns = [(1, "*.py"), (2, "*.js"), (3, "*.py")]
+        issues = find_duplicates(patterns)
+        assert len(issues) == 1
+        assert issues[0].line_number == 3
+
+    def test_trailing_slash_normalization(self):
+        patterns = [(1, "build"), (2, "build/")]
+        issues = find_duplicates(patterns)
+        assert len(issues) == 1
+
+
+class TestFindConflicts:
+    def test_no_conflicts(self):
+        patterns = [(1, "*.log"), (2, "*.tmp")]
+        assert find_conflicts(patterns) == []
+
+    def test_include_then_negate(self):
+        patterns = [(1, "*.log"), (2, "!*.log")]
+        issues = find_conflicts(patterns)
+        assert len(issues) == 1
+        assert issues[0].severity == Severity.WARNING
+
+    def test_negate_without_include(self):
+        patterns = [(1, "!important.txt")]
+        issues = find_conflicts(patterns)
+        assert len(issues) == 0
+
+
+class TestAnalyzeCoverage:
+    def test_many_wildcards(self):
+        patterns = [(i, f"*.ext{i}") for i in range(12)]
+        issues = analyze_coverage(patterns)
+        msgs = [i.message for i in issues]
+        assert any("wildcard" in m for m in msgs)
+
+    def test_no_directory_patterns(self):
+        patterns = [(i, f"*.ext{i}") for i in range(6)]
+        issues = analyze_coverage(patterns)
+        msgs = [i.message for i in issues]
+        assert any("directory" in m.lower() for m in msgs)
+
+    def test_duplicate_extension_suggestion(self):
+        patterns = [(1, "*.py"), (2, "*.py")]
+        issues = analyze_coverage(patterns)
+        msgs = [i.message for i in issues]
+        assert any(".py" in m for m in msgs)
+
+
+class TestValidateTemplate:
+    def test_valid_template(self):
+        with tempfile.NamedTemporaryFile(
+            mode="w", suffix=".gitignore", delete=False
+        ) as f:
+            f.write("# Build output\nbuild/\n*.o\n*.a\n")
+            f.flush()
+            report = validate_template(f.name)
+        os.unlink(f.name)
+        assert report.error_count == 0
+        assert report.pattern_count == 3
+        assert report.comment_count == 1
+
+    def test_invalid_pattern(self):
+        with tempfile.NamedTemporaryFile(
+            mode="w", suffix=".gitignore", delete=False
+        ) as f:
+            f.write("*.[invalid\n")
+            f.flush()
+            report = validate_template(f.name)
+        os.unlink(f.name)
+        assert report.error_count > 0
+
+    def test_file_not_found(self):
+        report = validate_template("/nonexistent/file.gitignore")
+        assert report.error_count > 0
+
+
+class TestFormatReport:
+    def test_clean_report(self):
+        report = ValidationReport(
+            template_file="test.gitignore",
+            total_lines=5,
+            pattern_count=3,
+            comment_count=1,
+            blank_count=1,
+        )
+        output = format_report(report)
+        assert "No issues found" in output
+
+    def test_report_with_issues(self):
+        report = ValidationReport(
+            template_file="test.gitignore",
+            total_lines=5,
+            pattern_count=3,
+        )
+        report.issues.append(
+            Issue(
+                severity=Severity.ERROR,
+                line_number=2,
+                line_content="*.[bad",
+                message="Invalid glob pattern",
+            )
+        )
+        output = format_report(report, verbose=True)
+        assert "ERROR" in output
+        assert "*.[bad" in output
+
+
+class TestDiscoverTemplates:
+    def test_discover_in_directory(self):
+        with tempfile.TemporaryDirectory() as tmpdir:
+            # Create fake gitignore files
+            for name in ["Python.gitignore", "Java.gitignore", "README.md"]:
+                with open(os.path.join(tmpdir, name), "w") as f:
+                    f.write("# test\n")
+            templates = discover_templates(tmpdir)
+            assert len(templates) == 2
+            assert all(t.endswith(".gitignore") for t in templates)
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])

scripts/validate_templates.py

@@ -0,0 +1,433 @@
+#!/usr/bin/env python3
+"""
+Gitignore Template Validator
+
+Validates .gitignore template files for syntax correctness, duplicate patterns,
+conflicting rules, and provides coverage analysis with detailed reporting.
+"""
+
+import argparse
+import fnmatch
+import os
+import re
+import sys
+from dataclasses import dataclass, field
+from enum import Enum
+from pathlib import Path
+from typing import List, Optional
+
+
+class Severity(Enum):
+    ERROR = "ERROR"
+    WARNING = "WARNING"
+    SUGGESTION = "SUGGESTION"
+
+
+@dataclass
+class Issue:
+    severity: Severity
+    line_number: int
+    line_content: str
+    message: str
+    template_file: str = ""
+
+
+@dataclass
+class ValidationReport:
+    template_file: str
+    total_lines: int = 0
+    pattern_count: int = 0
+    comment_count: int = 0
+    blank_count: int = 0
+    issues: List[Issue] = field(default_factory=list)
+
+    @property
+    def error_count(self) -> int:
+        return sum(1 for i in self.issues if i.severity == Severity.ERROR)
+
+    @property
+    def warning_count(self) -> int:
+        return sum(1 for i in self.issues if i.severity == Severity.WARNING)
+
+    @property
+    def suggestion_count(self) -> int:
+        return sum(1 for i in self.issues if i.severity == Severity.SUGGESTION)
+
+    @property
+    def has_errors(self) -> bool:
+        return self.error_count > 0
+
+
+def is_valid_glob_pattern(pattern: str) -> bool:
+    """Check if a pattern is a valid glob/gitignore pattern."""
+    clean = pattern.lstrip("!")
+    if clean.startswith("/"):
+        clean = clean[1:]
+    if clean.endswith("/"):
+        clean = clean[:-1]
+    if not clean:
+        return False
+    try:
+        # Check for unmatched brackets
+        bracket_depth = 0
+        i = 0
+        while i < len(clean):
+            ch = clean[i]
+            if ch == "\\" and i + 1 < len(clean):
+                i += 2
+                continue
+            if ch == "[":
+                bracket_depth += 1
+            elif ch == "]":
+                if bracket_depth > 0:
+                    bracket_depth -= 1
+                else:
+                    return False
+            i += 1
+        if bracket_depth != 0:
+            return False
+        # Test compile the pattern via fnmatch
+        fnmatch.translate(clean)
+        return True
+    except Exception:
+        return False
+
+
+def check_trailing_whitespace(line: str, line_number: int) -> Optional[Issue]:
+    """Detect trailing whitespace on a line."""
+    if line != line.rstrip() and line.strip():
+        return Issue(
+            severity=Severity.WARNING,
+            line_number=line_number,
+            line_content=line,
+            message="Line has trailing whitespace",
+        )
+    return None
+
+
+def find_duplicates(patterns: List[tuple]) -> List[Issue]:
+    """Find duplicate patterns in the list."""
+    issues = []
+    seen = {}
+    for line_num, pattern in patterns:
+        normalized = pattern.strip().rstrip("/")
+        if normalized in seen:
+            issues.append(
+                Issue(
+                    severity=Severity.WARNING,
+                    line_number=line_num,
+                    line_content=pattern,
+                    message=f"Duplicate pattern (first seen at line {seen[normalized]})",
+                )
+            )
+        else:
+            seen[normalized] = line_num
+    return issues
+
+
+def find_conflicts(patterns: List[tuple]) -> List[Issue]:
+    """Find conflicting include/exclude rules for the same pattern."""
+    issues = []
+    include_patterns = {}
+    exclude_patterns = {}
+
+    for line_num, pattern in patterns:
+        stripped = pattern.strip()
+        if stripped.startswith("!"):
+            base = stripped[1:].strip().rstrip("/")
+            exclude_patterns[base] = line_num
+            if base in include_patterns:
+                issues.append(
+                    Issue(
+                        severity=Severity.WARNING,
+                        line_number=line_num,
+                        line_content=stripped,
+                        message=(
+                            f"Negation pattern conflicts with include at line "
+                            f"{include_patterns[base]}. Order matters in gitignore."
+                        ),
+                    )
+                )
+        else:
+            base = stripped.rstrip("/")
+            include_patterns[base] = line_num
+
+    return issues
+
+
+def analyze_coverage(patterns: List[tuple]) -> List[Issue]:
+    """Analyze pattern coverage and suggest improvements."""
+    issues = []
+    wildcard_count = 0
+    extension_patterns = []
+    directory_patterns = []
+
+    for line_num, pattern in patterns:
+        stripped = pattern.strip().lstrip("!")
+        if stripped.startswith("*"):
+            wildcard_count += 1
+        if re.match(r"^\*\.[a-zA-Z0-9]+$", stripped):
+            extension_patterns.append((line_num, stripped))
+        if stripped.endswith("/"):
+            directory_patterns.append((line_num, stripped))
+
+    if wildcard_count > 10:
+        issues.append(
+            Issue(
+                severity=Severity.SUGGESTION,
+                line_number=0,
+                line_content="",
+                message=(
+                    f"Template has {wildcard_count} wildcard patterns. "
+                    "Consider grouping related patterns with comments."
+                ),
+            )
+        )
+
+    ext_groups = {}
+    for line_num, pat in extension_patterns:
+        ext = pat.split(".")[-1].lower()
+        ext_groups.setdefault(ext, []).append(line_num)
+
+    for ext, lines in ext_groups.items():
+        if len(lines) > 1:
+            issues.append(
+                Issue(
+                    severity=Severity.SUGGESTION,
+                    line_number=lines[1],
+                    line_content="",
+                    message=(
+                        f"Multiple patterns target .{ext} files "
+                        f"(lines {', '.join(map(str, lines))}). Consider consolidating."
+                    ),
+                )
+            )
+
+    if not directory_patterns and len(patterns) > 5:
+        issues.append(
+            Issue(
+                severity=Severity.SUGGESTION,
+                line_number=0,
+                line_content="",
+                message=(
+                    "No directory-specific patterns found. "
+                    "Consider adding directory ignores (e.g., build/)."
+                ),
+            )
+        )
+
+    return issues
+
+
+def validate_template(filepath: str) -> ValidationReport:
+    """Validate a single gitignore template file."""
+    report = ValidationReport(template_file=filepath)
+
+    try:
+        with open(filepath, "r", encoding="utf-8", errors="replace") as f:
+            lines = f.readlines()
+    except OSError as e:
+        report.issues.append(
+            Issue(
+                severity=Severity.ERROR,
+                line_number=0,
+                line_content="",
+                message=f"Cannot read file: {e}",
+                template_file=filepath,
+            )
+        )
+        return report
+
+    report.total_lines = len(lines)
+    patterns = []
+
+    for i, raw_line in enumerate(lines, start=1):
+        line = raw_line.rstrip("\n\r")
+
+        # Check trailing whitespace
+        ws_issue = check_trailing_whitespace(line, i)
+        if ws_issue:
+            ws_issue.template_file = filepath
+            report.issues.append(ws_issue)
+
+        stripped = line.strip()
+
+        # Blank line
+        if not stripped:
+            report.blank_count += 1
+            continue
+
+        # Comment
+        if stripped.startswith("#"):
+            report.comment_count += 1
+            continue
+
+        # Pattern line
+        report.pattern_count += 1
+        patterns.append((i, stripped))
+
+        # Validate glob syntax
+        if not is_valid_glob_pattern(stripped):
+            report.issues.append(
+                Issue(
+                    severity=Severity.ERROR,
+                    line_number=i,
+                    line_content=stripped,
+                    message="Invalid glob pattern syntax",
+                    template_file=filepath,
+                )
+            )
+
+        # Check for spaces in patterns (usually a mistake)
+        if " " in stripped and not stripped.startswith("\\"):
+            report.issues.append(
+                Issue(
+                    severity=Severity.WARNING,
+                    line_number=i,
+                    line_content=stripped,
+                    message="Pattern contains spaces — this may be unintentional",
+                    template_file=filepath,
+                )
+            )
+
+    # Run duplicate detection
+    dup_issues = find_duplicates(patterns)
+    for issue in dup_issues:
+        issue.template_file = filepath
+    report.issues.extend(dup_issues)
+
+    # Run conflict detection
+    conflict_issues = find_conflicts(patterns)
+    for issue in conflict_issues:
+        issue.template_file = filepath
+    report.issues.extend(conflict_issues)
+
+    # Run coverage analysis
+    coverage_issues = analyze_coverage(patterns)
+    for issue in coverage_issues:
+        issue.template_file = filepath
+    report.issues.extend(coverage_issues)
+
+    return report
+
+
+def format_report(report: ValidationReport, verbose: bool = False) -> str:
+    """Format a validation report as human-readable text."""
+    lines = []
+    lines.append(f"\n{'='*60}")
+    lines.append(f"File: {report.template_file}")
+    lines.append(f"{'='*60}")
+    lines.append(
+        f"  Lines: {report.total_lines}  |  Patterns: {report.pattern_count}  "
+        f"|  Comments: {report.comment_count}  |  Blank: {report.blank_count}"
+    )
+    lines.append(
+        f"  Errors: {report.error_count}  |  Warnings: {report.warning_count}  "
+        f"|  Suggestions: {report.suggestion_count}"
+    )
+
+    if report.issues:
+        lines.append("")
+        for issue in sorted(report.issues, key=lambda x: (x.severity.value, x.line_number)):
+            prefix = f"  [{issue.severity.value}]"
+            loc = f" Line {issue.line_number}:" if issue.line_number > 0 else ""
+            lines.append(f"{prefix}{loc} {issue.message}")
+            if verbose and issue.line_content:
+                lines.append(f"         > {issue.line_content}")
+    else:
+        lines.append("  No issues found. ✓")
+
+    return "\n".join(lines)
+
+
+def discover_templates(repo_root: str) -> List[str]:
+    """Discover all .gitignore template files in the repository."""
+    templates = []
+    for entry in os.listdir(repo_root):
+        full_path = os.path.join(repo_root, entry)
+        if os.path.isfile(full_path) and entry.endswith(".gitignore"):
+            templates.append(full_path)
+    # Also check Global/ and community/ subdirectories
+    for subdir in ["Global", "community"]:
+        subdir_path = os.path.join(repo_root, subdir)
+        if os.path.isdir(subdir_path):
+            for entry in os.listdir(subdir_path):
+                full_path = os.path.join(subdir_path, entry)
+                if os.path.isfile(full_path) and entry.endswith(".gitignore"):
+                    templates.append(full_path)
+    return sorted(templates)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Validate .gitignore template files for common issues."
+    )
+    parser.add_argument(
+        "files",
+        nargs="*",
+        help="Template files to validate. If none given, validates all in repo.",
+    )
+    parser.add_argument(
+        "--repo-root",
+        default=".",
+        help="Root directory of the gitignore repo (default: current directory).",
+    )
+    parser.add_argument(
+        "--verbose", "-v",
+        action="store_true",
+        help="Show pattern content alongside issues.",
+    )
+    parser.add_argument(
+        "--errors-only",
+        action="store_true",
+        help="Only report errors, not warnings or suggestions.",
+    )
+    parser.add_argument(
+        "--summary",
+        action="store_true",
+        help="Print only a summary, not per-file details.",
+    )
+
+    args = parser.parse_args()
+
+    if args.files:
+        templates = args.files
+    else:
+        templates = discover_templates(args.repo_root)
+
+    if not templates:
+        print("No .gitignore templates found.")
+        sys.exit(0)
+
+    reports = []
+    for tpl in templates:
+        report = validate_template(tpl)
+        reports.append(report)
+
+    total_errors = 0
+    total_warnings = 0
+    total_suggestions = 0
+
+    for report in reports:
+        if args.errors_only:
+            report.issues = [i for i in report.issues if i.severity == Severity.ERROR]
+        if not args.summary:
+            print(format_report(report, verbose=args.verbose))
+        total_errors += report.error_count
+        total_warnings += report.warning_count
+        total_suggestions += report.suggestion_count
+
+    print(f"\n{'='*60}")
+    print(f"SUMMARY: {len(reports)} templates validated")
+    print(f"  Total errors:      {total_errors}")
+    print(f"  Total warnings:    {total_warnings}")
+    print(f"  Total suggestions: {total_suggestions}")
+    print(f"{'='*60}")
+
+    if total_errors > 0:
+        sys.exit(1)
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()