smart-git-commit/suggestCommit/basicCommit.js

AI-powered smart commit message generator for Git diffs.

export function basicCommit(fileChanges) {
  if (fileChanges.length === 0) return "chore: update project files";

  const scopes = new Set();
  let changeIndicators = {
    fix: false,
    feat: false,
    refactor: false,
    docs: false,
    test: false,
  };

  const importantFiles = ["package.json", "README.md", ".env", ".gitignore"];

  fileChanges.forEach((file) => {
    const parts = file.file.split("/");
    // Scope = 2nd level folder, else fallback to file itself
    const scope = parts.length >= 2 ? parts[1] : parts[0];
    scopes.add(scope);

    const changesCombined = [...file.additions, ...file.deletions]
      .join(" ")
      .toLowerCase();

    if (/fix|bug|error|hotfix/.test(changesCombined))
      changeIndicators.fix = true;
    if (/add|create|feature|implement|introduce/.test(changesCombined))
      changeIndicators.feat = true;
    if (/refactor|optimize|cleanup|enhance/.test(changesCombined))
      changeIndicators.refactor = true;
    if (/doc|readme|documentation/.test(changesCombined))
      changeIndicators.docs = true;
    if (/test|jest|spec|assert/.test(changesCombined))
      changeIndicators.test = true;
  });

  // Prioritize change type
  let type = "chore";
  if (changeIndicators.fix) type = "fix";
  else if (changeIndicators.feat) type = "feat";
  else if (changeIndicators.refactor) type = "refactor";
  else if (changeIndicators.docs) type = "docs";
  else if (changeIndicators.test) type = "test";

  const scopeArray = Array.from(scopes);
  const scopeStr = scopeArray.join(", ");
  const scopeLabel = scopeArray.length > 1 ? "modules" : "module";

  // Dynamic Action
  let action = "updated";
  if (type === "fix") action = "fixed bugs in";
  else if (type === "feat") action = "introduced new features in";
  else if (type === "refactor") action = "refactored";
  else if (type === "docs") action = "updated documentation in";
  else if (type === "test") action = "added or modified tests in";

  // Special Case: Critical Files
  const criticalChanges = fileChanges.filter((f) =>
    importantFiles.includes(f.file)
  );
  if (criticalChanges.length > 0) {
    const criticalFiles = criticalChanges.map((f) => f.file).join(", ");
    return `chore(config): updated project configuration files (${criticalFiles})`;
  }

  // Final Commit Message
  return `${type}(${scopeStr}): ${action} ${scopeLabel}`;
}