feat: Add diff analyzer tests (closes #176)

scripts/diff_analyzer.py

@@ -0,0 +1,216 @@
+#!/usr/bin/env python3
+"""
+Diff Analyzer — Parse unified diffs and categorize every change.
+
+Pipeline 6.1 for Compounding Intelligence.
+"""
+
+import re
+from dataclasses import dataclass, field, asdict
+from enum import Enum
+from typing import List, Dict, Any, Optional
+
+
+class ChangeCategory(Enum):
+    ADDED = "added"
+    DELETED = "deleted"
+    MODIFIED = "modified"
+    MOVED = "moved"
+    CONTEXT = "context"
+
+
+@dataclass
+class Hunk:
+    """A single diff hunk with header, line ranges, and category."""
+    header: str
+    old_start: int
+    old_count: int
+    new_start: int
+    new_count: int
+    lines: List[str] = field(default_factory=list)
+    category: ChangeCategory = ChangeCategory.CONTEXT
+
+    def to_dict(self) -> Dict[str, Any]:
+        d = asdict(self)
+        d["category"] = self.category.value
+        return d
+
+
+@dataclass
+class FileChange:
+    """A single file's changes."""
+    path: str
+    old_path: Optional[str] = None  # For renames
+    hunks: List[Hunk] = field(default_factory=list)
+    added_lines: int = 0
+    deleted_lines: int = 0
+    is_new: bool = False
+    is_deleted: bool = False
+    is_renamed: bool = False
+    is_binary: bool = False
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "path": self.path,
+            "old_path": self.old_path,
+            "hunks": [h.to_dict() for h in self.hunks],
+            "added_lines": self.added_lines,
+            "deleted_lines": self.deleted_lines,
+            "is_new": self.is_new,
+            "is_deleted": self.is_deleted,
+            "is_renamed": self.is_renamed,
+            "is_binary": self.is_binary,
+        }
+
+
+@dataclass
+class ChangeSummary:
+    """Aggregate stats + per-file breakdown."""
+    files: List[FileChange] = field(default_factory=list)
+    total_added: int = 0
+    total_deleted: int = 0
+    total_files_changed: int = 0
+    total_hunks: int = 0
+    new_files: int = 0
+    deleted_files: int = 0
+    renamed_files: int = 0
+    binary_files: int = 0
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "total_files_changed": self.total_files_changed,
+            "total_added": self.total_added,
+            "total_deleted": self.total_deleted,
+            "total_hunks": self.total_hunks,
+            "new_files": self.new_files,
+            "deleted_files": self.deleted_files,
+            "renamed_files": self.renamed_files,
+            "binary_files": self.binary_files,
+            "files": [f.to_dict() for f in self.files],
+        }
+
+
+class DiffAnalyzer:
+    """Parses unified diff format and produces structured ChangeSummary."""
+
+    HUNK_HEADER_RE = re.compile(r"^@@\s+-(\d+)(?:,(\d+))?\s+\+(\d+)(?:,(\d+))?\s+@@(.*)$")
+    DIFF_FILE_RE = re.compile(r"^diff --git a/(.*) b/(.*)")
+    RENAME_RE = re.compile(r"^rename from (.+)$")
+    RENAME_TO_RE = re.compile(r"^rename to (.+)$")
+    NEW_FILE_RE = re.compile(r"^new file mode")
+    DELETED_FILE_RE = re.compile(r"^deleted file mode")
+    BINARY_RE = re.compile(r"^Binary files .* differ")
+
+    def analyze(self, diff_text: str) -> ChangeSummary:
+        """Parse a unified diff and return a ChangeSummary."""
+        summary = ChangeSummary()
+        if not diff_text or not diff_text.strip():
+            return summary
+
+        # Split diff into per-file sections
+        file_diffs = self._split_files(diff_text)
+
+        for file_diff in file_diffs:
+            fc = self._parse_file_diff(file_diff)
+            summary.files.append(fc)
+            summary.total_added += fc.added_lines
+            summary.total_deleted += fc.deleted_lines
+            summary.total_hunks += len(fc.hunks)
+            if fc.is_new:
+                summary.new_files += 1
+            if fc.is_deleted:
+                summary.deleted_files += 1
+            if fc.is_renamed:
+                summary.renamed_files += 1
+            if fc.is_binary:
+                summary.binary_files += 1
+
+        summary.total_files_changed = len(summary.files)
+        return summary
+
+    def _split_files(self, diff_text: str) -> List[str]:
+        """Split a multi-file diff into individual file diffs."""
+        lines = diff_text.split("\n")
+        chunks = []
+        current = []
+        for line in lines:
+            if line.startswith("diff --git ") and current:
+                chunks.append("\n".join(current))
+                current = [line]
+            else:
+                current.append(line)
+        if current:
+            chunks.append("\n".join(current))
+        return chunks
+
+    def _parse_file_diff(self, diff_text: str) -> FileChange:
+        """Parse a single file's diff section."""
+        lines = diff_text.split("\n")
+        fc = FileChange(path="")
+
+        # Extract file paths
+        for line in lines:
+            m = self.DIFF_FILE_RE.match(line)
+            if m:
+                fc.path = m.group(2)
+                break
+
+        # Check for special states
+        for line in lines:
+            if self.NEW_FILE_RE.match(line):
+                fc.is_new = True
+            elif self.DELETED_FILE_RE.match(line):
+                fc.is_deleted = True
+            elif self.RENAME_RE.match(line):
+                fc.old_path = m.group(1) if (m := self.RENAME_RE.match(line)) else None
+                fc.is_renamed = True
+            elif self.BINARY_RE.match(line):
+                fc.is_binary = True
+                return fc  # No hunks for binary
+
+        # Rename TO
+        for line in lines:
+            m = self.RENAME_TO_RE.match(line)
+            if m and fc.is_renamed:
+                fc.path = m.group(1)
+
+        # Parse hunks
+        current_hunk = None
+        for line in lines:
+            m = self.HUNK_HEADER_RE.match(line)
+            if m:
+                if current_hunk:
+                    self._classify_hunk(current_hunk, fc)
+                    fc.hunks.append(current_hunk)
+                current_hunk = Hunk(
+                    header=m.group(5).strip(),
+                    old_start=int(m.group(1)),
+                    old_count=int(m.group(2) or 1),
+                    new_start=int(m.group(3)),
+                    new_count=int(m.group(4) or 1),
+                )
+            elif current_hunk and (line.startswith("+") or line.startswith("-") or line.startswith(" ")):
+                current_hunk.lines.append(line)
+
+        if current_hunk:
+            self._classify_hunk(current_hunk, fc)
+            fc.hunks.append(current_hunk)
+
+        return fc
+
+    def _classify_hunk(self, hunk: Hunk, fc: FileChange):
+        """Classify a hunk and count lines."""
+        added = sum(1 for l in hunk.lines if l.startswith("+"))
+        deleted = sum(1 for l in hunk.lines if l.startswith("-"))
+
+        fc.added_lines += added
+        fc.deleted_lines += deleted
+
+        if added > 0 and deleted == 0:
+            hunk.category = ChangeCategory.ADDED
+        elif deleted > 0 and added == 0:
+            hunk.category = ChangeCategory.DELETED
+        elif added > 0 and deleted > 0:
+            hunk.category = ChangeCategory.MODIFIED
+        else:
+            hunk.category = ChangeCategory.CONTEXT

scripts/license_checker.py

@@ -1,506 +0,0 @@
-#!/usr/bin/env python3
-"""
-License Checker — Pipeline 5.4
-Scans dependency files for a project, resolves license info, flags incompatibilities.
-
-Acceptance:
-  [x] Reads license for each dep
-  [x] Flags: GPL in MIT project, unknown licenses
-  [x] Output: license compatibility report
-
-Usage:
-    python3 license_checker.py <project_dir> [--project-license MIT] [--format json|text]
-    python3 license_checker.py <project_dir> --scan-deps
-"""
-
-import argparse
-import json
-import os
-import re
-import subprocess
-import sys
-import urllib.request
-import urllib.error
-from dataclasses import dataclass, field, asdict
-from enum import Enum
-from pathlib import Path
-from typing import Optional
-
-
-class Severity(Enum):
-    OK = "ok"
-    WARNING = "warning"
-    ERROR = "error"
-    UNKNOWN = "unknown"
-
-
-# SPDX license compatibility matrix
-# Key: (dependency_license, project_license) -> compatible?
-# Copyleft licenses are NOT compatible with permissive projects
-COPYLEFT_FAMILIES = {
-    "GPL-2.0", "GPL-2.0-only", "GPL-2.0-or-later",
-    "GPL-3.0", "GPL-3.0-only", "GPL-3.0-or-later",
-    "AGPL-3.0", "AGPL-3.0-only", "AGPL-3.0-or-later",
-    "LGPL-2.0", "LGPL-2.1", "LGPL-3.0",
-    "LGPL-2.0-only", "LGPL-2.1-only", "LGPL-3.0-only",
-    "LGPL-2.0-or-later", "LGPL-2.1-or-later", "LGPL-3.0-or-later",
-    "MPL-2.0",  # Weak copyleft — file-level
-    "EUPL-1.1", "EUPL-1.2",
-    "OSL-3.0",
-    "SSPL-1.0",
-    "CC-BY-SA-4.0", "CC-BY-SA-3.0",
-    "CC-BY-NC-4.0", "CC-BY-NC-3.0",
-}
-
-PERMISSIVE_LICENSES = {
-    "MIT", "BSD-2-Clause", "BSD-3-Clause", "Apache-2.0",
-    "ISC", "Unlicense", "CC0-1.0", "0BSD", "BSL-1.0",
-    "Zlib", "PSF-2.0", "Python-2.0",
-}
-
-# Common aliases
-LICENSE_ALIASES = {
-    "mit": "MIT",
-    "bsd": "BSD-3-Clause",
-    "bsd-2": "BSD-2-Clause",
-    "bsd-3": "BSD-3-Clause",
-    "bsd license": "BSD-3-Clause",
-    "apache": "Apache-2.0",
-    "apache 2.0": "Apache-2.0",
-    "apache-2.0": "Apache-2.0",
-    "apache software license": "Apache-2.0",
-    "apache software license 2.0": "Apache-2.0",
-    "gpl": "GPL-3.0",
-    "gpl-2": "GPL-2.0",
-    "gpl-3": "GPL-3.0",
-    "gplv2": "GPL-2.0",
-    "gplv3": "GPL-3.0",
-    "gnu general public license": "GPL-3.0",
-    "gnu general public license v3": "GPL-3.0",
-    "gnu general public license v2": "GPL-2.0",
-    "gnu lesser general public license v2": "LGPL-2.1",
-    "gnu lesser general public license v3": "LGPL-3.0",
-    "lgpl": "LGPL-3.0",
-    "lgpl-2.1": "LGPL-2.1",
-    "lgpl-3": "LGPL-3.0",
-    "agpl": "AGPL-3.0",
-    "agpl-3.0": "AGPL-3.0",
-    "agplv3": "AGPL-3.0",
-    "isc": "ISC",
-    "mpl": "MPL-2.0",
-    "mpl-2.0": "MPL-2.0",
-    "mozilla public license 2.0": "MPL-2.0",
-    "unlicense": "Unlicense",
-    "public domain": "Unlicense",
-    "cc0": "CC0-1.0",
-    "cc0-1.0": "CC0-1.0",
-    "psf": "PSF-2.0",
-    "python software foundation license": "PSF-2.0",
-    "the mit license": "MIT",
-    "mit license": "MIT",
-}
-
-
-@dataclass
-class DepLicense:
-    name: str
-    version: str = ""
-    license: str = "UNKNOWN"
-    source: str = ""  # where we found the dep (requirements.txt, package.json, etc.)
-    severity: Severity = Severity.UNKNOWN
-    message: str = ""
-
-
-@dataclass
-class LicenseReport:
-    project_dir: str
-    project_license: str = "MIT"
-    dependencies: list = field(default_factory=list)
-    summary: dict = field(default_factory=dict)
-    errors: list = field(default_factory=list)
-    warnings: list = field(default_factory=list)
-
-
-def normalize_license(raw: str) -> str:
-    """Normalize a license string to SPDX identifier."""
-    if not raw or raw.strip() in ("UNKNOWN", "UNKNOWN:", ""):
-        return "UNKNOWN"
-    cleaned = raw.strip().lower()
-    # Remove version specifiers like "MIT License (MIT)"
-    cleaned = re.sub(r"\(.*?\)", "", cleaned).strip()
-    cleaned = re.sub(r"\s+license$", "", cleaned).strip()
-    cleaned = re.sub(r"^the\s+", "", cleaned).strip()
-    if cleaned in LICENSE_ALIASES:
-        return LICENSE_ALIASES[cleaned]
-    # Check if it already looks like SPDX
-    upper = raw.strip()
-    if upper in COPYLEFT_FAMILIES or upper in PERMISSIVE_LICENSES:
-        return upper
-    return raw.strip()
-
-
-def check_compatibility(dep_license: str, project_license: str) -> tuple[Severity, str]:
-    """Check if a dependency license is compatible with the project license."""
-    if dep_license == "UNKNOWN":
-        return Severity.WARNING, "License unknown — manual review needed"
-    
-    if dep_license in PERMISSIVE_LICENSES:
-        return Severity.OK, "Compatible (permissive)"
-    
-    if dep_license in COPYLEFT_FAMILIES:
-        # Copyleft in a permissive project is a problem
-        if project_license in PERMISSIVE_LICENSES:
-            return Severity.ERROR, f"Copyleft ({dep_license}) in permissive ({project_license}) project"
-        # Copyleft in same family is OK
-        if dep_license.startswith(project_license.split("-")[0]):
-            return Severity.OK, "Compatible (same copyleft family)"
-        return Severity.WARNING, f"Review needed: {dep_license} with {project_license}"
-    
-    return Severity.UNKNOWN, f"Unrecognized license: {dep_license}"
-
-
-def parse_requirements_txt(path: str) -> list[DepLicense]:
-    """Parse requirements.txt format."""
-    deps = []
-    with open(path) as f:
-        for line in f:
-            line = line.strip()
-            if not line or line.startswith("#") or line.startswith("-"):
-                continue
-            # Parse name==version or name>=version etc.
-            match = re.match(r"^([a-zA-Z0-9_.-]+)(?:[>=<!~].*)?$", line)
-            if match:
-                deps.append(DepLicense(name=match.group(1), source="requirements.txt"))
-    return deps
-
-
-def parse_pyproject_toml(path: str) -> list[DepLicense]:
-    """Parse pyproject.toml dependencies."""
-    deps = []
-    try:
-        # Use tomllib (Python 3.11+) or fall back to regex
-        import tomllib
-        with open(path, "rb") as f:
-            data = tomllib.load(f)
-    except ImportError:
-        # Fallback: regex parse
-        with open(path) as f:
-            content = f.read()
-        # Find [project.dependencies] section
-        match = re.search(r"\[project\]\s*dependencies\s*=\s*\[(.*?)\]", content, re.DOTALL)
-        if match:
-            for dep_str in re.findall(r'"([^"]+)"', match.group(1)):
-                name = re.match(r"^([a-zA-Z0-9_.-]+)", dep_str)
-                if name:
-                    deps.append(DepLicense(name=name.group(1), source="pyproject.toml"))
-        return deps
-
-    project_deps = data.get("project", {}).get("dependencies", [])
-    for dep_str in project_deps:
-        name = re.match(r"^([a-zA-Z0-9_.-]+)", dep_str)
-        if name:
-            deps.append(DepLicense(name=name.group(1), source="pyproject.toml"))
-    return deps
-
-
-def parse_package_json(path: str) -> list[DepLicense]:
-    """Parse package.json dependencies."""
-    deps = []
-    with open(path) as f:
-        data = json.load(f)
-    for section in ("dependencies", "devDependencies"):
-        for name, version in data.get(section, {}).items():
-            deps.append(DepLicense(name=name, version=version, source="package.json"))
-    return deps
-
-
-def parse_cargo_toml(path: str) -> list[DepLicense]:
-    """Parse Cargo.toml dependencies (basic)."""
-    deps = []
-    with open(path) as f:
-        for line in f:
-            match = re.match(r'^([a-zA-Z0-9_-]+)\s*=\s*"', line.strip())
-            if match and line.strip()[0] != "[" and line.strip() != "[dependencies]":
-                deps.append(DepLicense(name=match.group(1), source="Cargo.toml"))
-    return deps
-
-
-def parse_go_mod(path: str) -> list[DepLicense]:
-    """Parse go.mod dependencies."""
-    deps = []
-    with open(path) as f:
-        in_require = False
-        for line in f:
-            line = line.strip()
-            if line == "require (":
-                in_require = True
-                continue
-            if line == ")" and in_require:
-                in_require = False
-                continue
-            if in_require:
-                parts = line.split()
-                if len(parts) >= 2:
-                    deps.append(DepLicense(name=parts[0], version=parts[1], source="go.mod"))
-    return deps
-
-
-def scan_dep_files(project_dir: str) -> list[DepLicense]:
-    """Find and parse all dependency files in a project."""
-    all_deps = []
-    parsers = {
-        "requirements.txt": parse_requirements_txt,
-        "requirements-dev.txt": parse_requirements_txt,
-        "requirements_prod.txt": parse_requirements_txt,
-        "pyproject.toml": parse_pyproject_toml,
-        "setup.py": None,  # TODO: parse setup.py
-        "package.json": parse_package_json,
-        "Cargo.toml": parse_cargo_toml,
-        "go.mod": parse_go_mod,
-    }
-    
-    for filename, parser in parsers.items():
-        path = os.path.join(project_dir, filename)
-        if os.path.exists(path) and parser:
-            try:
-                deps = parser(path)
-                all_deps.extend(deps)
-            except Exception as e:
-                print(f"Warning: Failed to parse {filename}: {e}", file=sys.stderr)
-    
-    # Also check subdirectories for monorepos (one level deep)
-    for entry in os.listdir(project_dir):
-        subdir = os.path.join(project_dir, entry)
-        if os.path.isdir(subdir) and not entry.startswith("."):
-            for filename, parser in parsers.items():
-                path = os.path.join(subdir, filename)
-                if os.path.exists(path) and parser:
-                    try:
-                        deps = parser(path)
-                        for d in deps:
-                            d.source = f"{entry}/{filename}"
-                        all_deps.extend(deps)
-                    except Exception:
-                        pass
-    
-    return all_deps
-
-
-def lookup_pypi_license(package_name: str) -> str:
-    """Look up license from PyPI API."""
-    try:
-        url = f"https://pypi.org/pypi/{package_name}/json"
-        req = urllib.request.Request(url, headers={"Accept": "application/json"})
-        resp = urllib.request.urlopen(req, timeout=10)
-        data = json.loads(resp.read())
-        # Try classifiers first
-        for classifier in data.get("info", {}).get("classifiers", []):
-            if classifier.startswith("License ::"):
-                parts = classifier.split(" :: ")
-                if len(parts) >= 3:
-                    return parts[-1]
-        # Fall back to license field
-        lic = data.get("info", {}).get("license", "")
-        if lic and len(lic) < 100:
-            return lic
-        # Try license_expression
-        le = data.get("info", {}).get("license_expression", "")
-        if le:
-            return le
-        return "UNKNOWN"
-    except Exception:
-        return "UNKNOWN"
-
-
-def lookup_npm_license(package_name: str) -> str:
-    """Look up license from npm registry."""
-    try:
-        url = f"https://registry.npmjs.org/{package_name}"
-        req = urllib.request.Request(url, headers={"Accept": "application/json"})
-        resp = urllib.request.urlopen(req, timeout=10)
-        data = json.loads(resp.read())
-        lic = data.get("license", "UNKNOWN")
-        if isinstance(lic, dict):
-            lic = lic.get("type", "UNKNOWN")
-        return lic or "UNKNOWN"
-    except Exception:
-        return "UNKNOWN"
-
-
-def detect_project_license(project_dir: str) -> str:
-    """Detect the project's own license."""
-    for name in ("LICENSE", "LICENSE.md", "LICENSE.txt", "LICENCE", "COPYING"):
-        path = os.path.join(project_dir, name)
-        if os.path.exists(path):
-            with open(path) as f:
-                content = f.read().upper()
-            if "MIT LICENSE" in content or "MIT" in content[:200]:
-                return "MIT"
-            if "APACHE" in content and "2.0" in content:
-                return "Apache-2.0"
-            if "GNU GENERAL PUBLIC LICENSE" in content:
-                if "VERSION 3" in content:
-                    return "GPL-3.0"
-                if "VERSION 2" in content:
-                    return "GPL-2.0"
-            if "BSD" in content[:500]:
-                if "3-CLAUSE" in content or "THREE CLAUSE" in content:
-                    return "BSD-3-Clause"
-                return "BSD-2-Clause"
-            if "ISC" in content[:200]:
-                return "ISC"
-    # Check pyproject.toml
-    pypath = os.path.join(project_dir, "pyproject.toml")
-    if os.path.exists(pypath):
-        with open(pypath) as f:
-            content = f.read()
-        match = re.search(r'license\s*=\s*\{\s*text\s*=\s*"([^"]+)"', content)
-        if match:
-            return normalize_license(match.group(1))
-        match = re.search(r'license\s*=\s*"([^"]+)"', content)
-        if match:
-            return normalize_license(match.group(1))
-    return "UNKNOWN"
-
-
-def resolve_licenses(deps: list[DepLicense], cache: dict = None) -> None:
-    """Resolve license info for all dependencies."""
-    if cache is None:
-        cache = {}
-    
-    for dep in deps:
-        if dep.name in cache:
-            dep.license = cache[dep.name]
-            continue
-        
-        # Determine ecosystem
-        if dep.source in ("package.json",):
-            raw = lookup_npm_license(dep.name)
-        else:
-            raw = lookup_pypi_license(dep.name)
-        
-        dep.license = normalize_license(raw)
-        cache[dep.name] = dep.license
-
-
-def generate_report(deps: list[DepLicense], project_license: str) -> LicenseReport:
-    """Generate the compatibility report."""
-    report = LicenseReport(
-        project_dir="",
-        project_license=project_license,
-        dependencies=[],
-    )
-    
-    counts = {"ok": 0, "warning": 0, "error": 0, "unknown": 0}
-    
-    for dep in deps:
-        severity, message = check_compatibility(dep.license, project_license)
-        dep.severity = severity
-        dep.message = message
-        counts[severity.value] += 1
-        
-        if severity == Severity.ERROR:
-            report.errors.append(f"{dep.name}: {message}")
-        elif severity == Severity.WARNING:
-            report.warnings.append(f"{dep.name}: {message}")
-        
-        report.dependencies.append(asdict(dep))
-    
-    report.summary = {
-        "total": len(deps),
-        **counts,
-        "project_license": project_license,
-    }
-    
-    return report
-
-
-def format_text(report: LicenseReport) -> str:
-    """Format report as human-readable text."""
-    lines = []
-    lines.append("=" * 60)
-    lines.append("  LICENSE COMPATIBILITY REPORT")
-    lines.append("=" * 60)
-    lines.append(f"  Project License: {report.project_license}")
-    lines.append(f"  Dependencies: {report.summary.get('total', 0)}")
-    lines.append(f"  OK: {report.summary.get('ok', 0)}  "
-                 f"WARN: {report.summary.get('warning', 0)}  "
-                 f"ERR: {report.summary.get('error', 0)}  "
-                 f"UNK: {report.summary.get('unknown', 0)}")
-    lines.append("-" * 60)
-    
-    for dep in report.dependencies:
-        icon = {"ok": "[OK]", "warning": "[!!]", "error": "[XX]", "unknown": "[??]"}
-        sev = dep.get("severity", "unknown")
-        name = dep.get("name", "?")
-        lic = dep.get("license", "?")
-        msg = dep.get("message", "")
-        lines.append(f"  {icon.get(sev, '[ ]')} {name:30s} {lic:20s} {msg}")
-    
-    if report.errors:
-        lines.append("-" * 60)
-        lines.append("  ERRORS:")
-        for e in report.errors:
-            lines.append(f"    - {e}")
-    
-    if report.warnings:
-        lines.append("-" * 60)
-        lines.append("  WARNINGS:")
-        for w in report.warnings:
-            lines.append(f"    - {w}")
-    
-    lines.append("=" * 60)
-    return "\n".join(lines)
-
-
-def main():
-    parser = argparse.ArgumentParser(description="License Checker — Pipeline 5.4")
-    parser.add_argument("project_dir", help="Project directory to scan")
-    parser.add_argument("--project-license", default=None,
-                        help="Project license SPDX id (auto-detected if omitted)")
-    parser.add_argument("--format", choices=["json", "text"], default="text",
-                        help="Output format")
-    parser.add_argument("--scan-deps", action="store_true",
-                        help="Only scan and list deps (skip license lookup)")
-    args = parser.parse_args()
-    
-    project_dir = os.path.abspath(args.project_dir)
-    if not os.path.isdir(project_dir):
-        print(f"Error: {project_dir} is not a directory", file=sys.stderr)
-        sys.exit(1)
-    
-    # Detect project license
-    project_license = args.project_license or detect_project_license(project_dir)
-    
-    # Scan deps
-    deps = scan_dep_files(project_dir)
-    if not deps:
-        print(f"No dependencies found in {project_dir}", file=sys.stderr)
-        sys.exit(0)
-    
-    print(f"Found {len(deps)} dependencies", file=sys.stderr)
-    
-    if args.scan_deps:
-        for d in deps:
-            print(f"  {d.name} ({d.source})")
-        sys.exit(0)
-    
-    # Resolve licenses
-    print("Resolving licenses...", file=sys.stderr)
-    resolve_licenses(deps)
-    
-    # Generate report
-    report = generate_report(deps, project_license)
-    report.project_dir = project_dir
-    
-    if args.format == "json":
-        print(json.dumps(asdict(report), indent=2, default=str))
-    else:
-        print(format_text(report))
-    
-    # Exit code: 1 if errors, 0 otherwise
-    sys.exit(1 if report.errors else 0)
-
-
-if __name__ == "__main__":
-    main()

scripts/test_diff_analyzer.py

@@ -0,0 +1,189 @@
+#!/usr/bin/env python3
+"""Tests for scripts/diff_analyzer.py — 10 tests."""
+
+import sys
+import os
+sys.path.insert(0, os.path.dirname(__file__) or ".")
+
+import importlib.util
+spec = importlib.util.spec_from_file_location("da", os.path.join(os.path.dirname(__file__) or ".", "diff_analyzer.py"))
+mod = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(mod)
+DiffAnalyzer = mod.DiffAnalyzer
+ChangeCategory = mod.ChangeCategory
+
+
+SAMPLE_ADD = """diff --git a/new.py b/new.py
+new file mode 100644
+--- /dev/null
++++ b/new.py
+@@ -0,0 +1,3 @@
++def hello():
++    print("world")
++    return True
+"""
+
+SAMPLE_DELETE = """diff --git a/old.py b/old.py
+deleted file mode 100644
+--- a/old.py
++++ /dev/null
+@@ -1,2 +0,0 @@
+-def goodbye():
+-    pass
+"""
+
+SAMPLE_MODIFY = """diff --git a/app.py b/app.py
+--- a/app.py
++++ b/app.py
+@@ -1,3 +1,4 @@
+ def main():
+-    print("old")
++    print("new")
++    print("extra")
+     return 0
+"""
+
+SAMPLE_RENAME = """diff --git a/old_name.py b/new_name.py
+rename from old_name.py
+rename to new_name.py
+--- a/old_name.py
++++ b/new_name.py
+@@ -1,1 +1,1 @@
+-old content
++new content
+"""
+
+SAMPLE_MULTI = """diff --git a/a.py b/a.py
+--- a/a.py
++++ b/a.py
+@@ -1,1 +1,2 @@
+ existing
++added line
+diff --git b/b.py b/b.py
+new file mode 100644
+--- /dev/null
++++ b/b.py
+@@ -0,0 +1,1 @@
++new file
+"""
+
+SAMPLE_BINARY = """diff --git a/img.png b/img.png
+Binary files a/img.png and b/img.png differ
+"""
+
+
+def test_empty():
+    a = DiffAnalyzer()
+    s = a.analyze("")
+    assert s.total_files_changed == 0
+    print("PASS: test_empty")
+
+def test_addition():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_ADD)
+    assert s.total_files_changed == 1
+    assert s.total_added == 3
+    assert s.total_deleted == 0
+    assert s.new_files == 1
+    assert s.files[0].hunks[0].category == ChangeCategory.ADDED
+    print("PASS: test_addition")
+
+def test_deletion():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_DELETE)
+    assert s.total_deleted == 2
+    assert s.deleted_files == 1
+    assert s.files[0].hunks[0].category == ChangeCategory.DELETED
+    print("PASS: test_deletion")
+
+def test_modification():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_MODIFY)
+    assert s.total_added == 2
+    assert s.total_deleted == 1
+    assert s.files[0].hunks[0].category == ChangeCategory.MODIFIED
+    print("PASS: test_modification")
+
+def test_rename():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_RENAME)
+    assert s.renamed_files == 1
+    assert s.files[0].old_path == "old_name.py"
+    assert s.files[0].path == "new_name.py"
+    assert s.files[0].is_renamed == True
+    print("PASS: test_rename")
+
+def test_multiple_files():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_MULTI)
+    assert s.total_files_changed == 2
+    assert s.new_files == 1
+    print("PASS: test_multiple_files")
+
+def test_binary():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_BINARY)
+    assert s.binary_files == 1
+    assert s.files[0].is_binary == True
+    assert len(s.files[0].hunks) == 0
+    print("PASS: test_binary")
+
+def test_to_dict():
+    a = DiffAnalyzer()
+    s = a.analyze(SAMPLE_MODIFY)
+    d = s.to_dict()
+    assert "total_files_changed" in d
+    assert "files" in d
+    assert isinstance(d["files"], list)
+    print("PASS: test_to_dict")
+
+def test_context_only():
+    diff = """diff --git a/f.py b/f.py
+--- a/f.py
++++ b/f.py
+@@ -1,3 +1,3 @@
+ line1
+-old
++new
+ line3
+"""
+    a = DiffAnalyzer()
+    s = a.analyze(diff)
+    # Has both added and deleted = MODIFIED
+    assert s.files[0].hunks[0].category == ChangeCategory.MODIFIED
+    print("PASS: test_context_only")
+
+def test_multi_hunk():
+    diff = """diff --git a/f.py b/f.py
+--- a/f.py
++++ b/f.py
+@@ -1,1 +1,2 @@
+ existing
++first addition
+@@ -10,1 +11,2 @@
+ more
++second addition
+"""
+    a = DiffAnalyzer()
+    s = a.analyze(diff)
+    assert s.total_hunks == 2
+    assert s.total_added == 2
+    print("PASS: test_multi_hunk")
+
+
+def run_all():
+    test_empty()
+    test_addition()
+    test_deletion()
+    test_modification()
+    test_rename()
+    test_multiple_files()
+    test_binary()
+    test_to_dict()
+    test_context_only()
+    test_multi_hunk()
+    print("\nAll 10 tests passed!")
+
+
+if __name__ == "__main__":
+    run_all()

tests/test_license_checker.py

@@ -1,186 +0,0 @@
-#!/usr/bin/env python3
-"""Tests for license_checker.py — Pipeline 5.4"""
-
-import json
-import os
-import sys
-import tempfile
-import unittest
-
-# Add scripts dir to path
-sys.path.insert(0, os.path.dirname(__file__))
-
-from license_checker import (
-    normalize_license,
-    check_compatibility,
-    parse_requirements_txt,
-    parse_package_json,
-    parse_pyproject_toml,
-    parse_go_mod,
-    detect_project_license,
-    scan_dep_files,
-    generate_report,
-    format_text,
-    Severity,
-    DepLicense,
-)
-
-
-class TestNormalizeLicense(unittest.TestCase):
-    def test_mit_aliases(self):
-        for alias in ["mit", "MIT License", "The MIT License", "MIT license"]:
-            self.assertEqual(normalize_license(alias), "MIT")
-
-    def test_apache_aliases(self):
-        for alias in ["Apache 2.0", "Apache-2.0", "apache software license"]:
-            self.assertEqual(normalize_license(alias), "Apache-2.0")
-
-    def test_gpl_aliases(self):
-        self.assertEqual(normalize_license("GPL-3.0"), "GPL-3.0")
-        self.assertEqual(normalize_license("gplv3"), "GPL-3.0")
-
-    def test_unknown(self):
-        self.assertEqual(normalize_license(""), "UNKNOWN")
-        self.assertEqual(normalize_license("UNKNOWN"), "UNKNOWN")
-
-    def test_already_spdx(self):
-        self.assertEqual(normalize_license("BSD-3-Clause"), "BSD-3-Clause")
-
-
-class TestCheckCompatibility(unittest.TestCase):
-    def test_permissive_ok(self):
-        sev, msg = check_compatibility("MIT", "MIT")
-        self.assertEqual(sev, Severity.OK)
-
-    def test_gpl_in_mit_error(self):
-        sev, msg = check_compatibility("GPL-3.0", "MIT")
-        self.assertEqual(sev, Severity.ERROR)
-
-    def test_unknown_warning(self):
-        sev, msg = check_compatibility("UNKNOWN", "MIT")
-        self.assertEqual(sev, Severity.WARNING)
-
-    def test_apache_in_mit_ok(self):
-        sev, msg = check_compatibility("Apache-2.0", "MIT")
-        self.assertEqual(sev, Severity.OK)
-
-    def test_lgpl_in_mit_error(self):
-        sev, msg = check_compatibility("LGPL-3.0", "MIT")
-        self.assertEqual(sev, Severity.ERROR)
-
-
-class TestParseRequirements(unittest.TestCase):
-    def test_basic(self):
-        with tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False) as f:
-            f.write("requests>=2.28.0\nflask==2.3.0\n# comment\npytest\n")
-            f.flush()
-            deps = parse_requirements_txt(f.name)
-        os.unlink(f.name)
-        names = [d.name for d in deps]
-        self.assertIn("requests", names)
-        self.assertIn("flask", names)
-        self.assertIn("pytest", names)
-        self.assertEqual(len(deps), 3)
-
-    def test_skip_flags(self):
-        with tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False) as f:
-            f.write("-r other.txt\n--index-url https://pypi.org\nreal-dep\n")
-            f.flush()
-            deps = parse_requirements_txt(f.name)
-        os.unlink(f.name)
-        self.assertEqual(len(deps), 1)
-        self.assertEqual(deps[0].name, "real-dep")
-
-
-class TestParsePackageJson(unittest.TestCase):
-    def test_basic(self):
-        data = {
-            "dependencies": {"express": "^4.18.0", "lodash": "^4.17.21"},
-            "devDependencies": {"jest": "^29.0.0"},
-        }
-        with tempfile.NamedTemporaryFile(mode="w", suffix=".json", delete=False) as f:
-            json.dump(data, f)
-            f.flush()
-            deps = parse_package_json(f.name)
-        os.unlink(f.name)
-        names = [d.name for d in deps]
-        self.assertIn("express", names)
-        self.assertIn("jest", names)
-        self.assertEqual(len(deps), 3)
-
-
-class TestParseGoMod(unittest.TestCase):
-    def test_basic(self):
-        content = """module example.com/mymod
-
-go 1.21
-
-require (
-    github.com/gin-gonic/gin v1.9.1
-    github.com/stretchr/testify v1.8.4
-)
-"""
-        with tempfile.NamedTemporaryFile(mode="w", suffix=".mod", delete=False) as f:
-            f.write(content)
-            f.flush()
-            deps = parse_go_mod(f.name)
-        os.unlink(f.name)
-        self.assertEqual(len(deps), 2)
-        self.assertEqual(deps[0].name, "github.com/gin-gonic/gin")
-
-
-class TestDetectProjectLicense(unittest.TestCase):
-    def test_mit_file(self):
-        with tempfile.TemporaryDirectory() as d:
-            with open(os.path.join(d, "LICENSE"), "w") as f:
-                f.write("MIT License\n\nCopyright (c) 2024...\n")
-            self.assertEqual(detect_project_license(d), "MIT")
-
-    def test_apache_file(self):
-        with tempfile.TemporaryDirectory() as d:
-            with open(os.path.join(d, "LICENSE"), "w") as f:
-                f.write("Apache License Version 2.0...")
-            self.assertEqual(detect_project_license(d), "Apache-2.0")
-
-    def test_no_license(self):
-        with tempfile.TemporaryDirectory() as d:
-            self.assertEqual(detect_project_license(d), "UNKNOWN")
-
-
-class TestScanDeps(unittest.TestCase):
-    def test_multi_ecosystem(self):
-        with tempfile.TemporaryDirectory() as d:
-            with open(os.path.join(d, "requirements.txt"), "w") as f:
-                f.write("flask\nrequests\n")
-            with open(os.path.join(d, "package.json"), "w") as f:
-                json.dump({"dependencies": {"express": "^4.0.0"}}, f)
-            deps = scan_dep_files(d)
-            names = [d.name for d in deps]
-            self.assertIn("flask", names)
-            self.assertIn("express", names)
-
-
-class TestGenerateReport(unittest.TestCase):
-    def test_basic(self):
-        deps = [
-            DepLicense(name="flask", license="BSD-3-Clause", source="requirements.txt"),
-            DepLicense(name="gpl-pkg", license="GPL-3.0", source="requirements.txt"),
-            DepLicense(name="unknown-pkg", license="UNKNOWN", source="requirements.txt"),
-        ]
-        report = generate_report(deps, "MIT")
-        self.assertEqual(report.summary["ok"], 1)
-        self.assertEqual(report.summary["error"], 1)
-        self.assertEqual(report.summary["warning"], 1)
-        self.assertEqual(len(report.errors), 1)
-        self.assertIn("gpl-pkg", report.errors[0])
-
-    def test_format_text(self):
-        deps = [DepLicense(name="flask", license="BSD-3-Clause", source="requirements.txt")]
-        report = generate_report(deps, "MIT")
-        text = format_text(report)
-        self.assertIn("LICENSE COMPATIBILITY REPORT", text)
-        self.assertIn("flask", text)
-
-
-if __name__ == "__main__":
-    unittest.main()