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* HTML report generation for validation framework
* Core: diff2html report generation
*/
import fs from 'fs-extra';
import path from 'node:path';
import { execSync } from 'node:child_process';
import {
escapeHtml,
render,
renderTemplate,
loadTemplate,
loadStyles,
} from './template-renderer.js';
// Re-export escapeHtml for backward compatibility
export { escapeHtml };
/**
* Generate the diff header HTML for injection into diff2html output
* @param {string} reportName - Name of the report
* @param {string} relativePath - Relative path of the file
* @returns {string} Header HTML
*/
function generateDiffHeader(reportName, relativePath) {
const template = loadTemplate('diff-header.html');
const styles = loadStyles();
// Include inline styles for the header since it's injected into diff2html output
const inlineStyles = `
<style>
.diff-header {
background: #1e1e1e;
color: #d4d4d4;
padding: 16px 24px;
border-bottom: 1px solid #3e3e42;
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.diff-header__title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.diff-header__comparison { font-size: 14px; color: #858585; }
.diff-header__baseline { color: #f48771; }
.diff-header__current { color: #89d185; }
.diff-header__path { font-size: 13px; color: #6a9955; margin-top: 8px; font-family: 'Monaco', 'Menlo', monospace; }
.diff-header__back { margin-top: 12px; }
.diff-header__back a { color: #4ec9b0; text-decoration: none; }
.diff-header__back a:hover { text-decoration: underline; }
</style>`;
const headerHtml = render(template, {
reportName: escapeHtml(reportName),
relativePath: escapeHtml(relativePath),
});
return inlineStyles + headerHtml;
}
/**
* Generate HTML diff for a file using diff2html-cli
* @param {Object} result - Comparison result
* @param {string} outputPath - Path to write HTML file
* @param {string} reportDir - Report directory for temp files
* @param {string} reportName - Name of the report for header
* @returns {boolean} True if successful
*/
export function generateHtmlDiff(result, outputPath, reportDir, reportName = 'Comparison') {
const { relativePath, status, baselineContent, currentContent } = result;
try {
if (status === 'added' || status === 'removed') {
// For added/removed files, create a simple diff
const emptyFile = path.join(reportDir, '.empty');
fs.writeFileSync(emptyFile, '', 'utf8');
if (status === 'added') {
const currentFile = path.join(reportDir, '.current');
fs.writeFileSync(currentFile, currentContent, 'utf8');
execSync(
`diff -u "${emptyFile}" "${currentFile}" | npx --yes diff2html-cli -i stdin -s side -F "${outputPath}"`,
{ cwd: reportDir, stdio: 'pipe' },
);
fs.removeSync(currentFile);
} else {
const baselineFile = path.join(reportDir, '.baseline');
fs.writeFileSync(baselineFile, baselineContent, 'utf8');
execSync(
`diff -u "${baselineFile}" "${emptyFile}" | npx --yes diff2html-cli -i stdin -s side -F "${outputPath}"`,
{ cwd: reportDir, stdio: 'pipe' },
);
fs.removeSync(baselineFile);
}
fs.removeSync(emptyFile);
} else {
// For different files, create temp files and diff
const baselineFile = path.join(reportDir, '.baseline');
const currentFile = path.join(reportDir, '.current');
fs.writeFileSync(baselineFile, baselineContent, 'utf8');
fs.writeFileSync(currentFile, currentContent, 'utf8');
try {
execSync(
`diff -u "${baselineFile}" "${currentFile}" | npx --yes diff2html-cli -i stdin -s side -F "${outputPath}"`,
{ cwd: reportDir, stdio: 'pipe' },
);
} catch (e) {
// diff returns exit code 1 when files differ, which is expected
if (!fs.existsSync(outputPath)) {
throw e;
}
}
fs.removeSync(baselineFile);
fs.removeSync(currentFile);
}
// Post-process: Replace diff2html default header with custom header
if (fs.existsSync(outputPath)) {
let html = fs.readFileSync(outputPath, 'utf8');
// Replace the title
html = html.replace(
/<title>.*?<\/title>/,
`<title>${escapeHtml(relativePath)} - ${escapeHtml(reportName)}</title>`,
);
// Generate and insert custom header after <body> tag
const customHeader = generateDiffHeader(reportName, relativePath);
html = html.replace(/<body[^>]*>/, `$&${customHeader}`);
fs.writeFileSync(outputPath, html, 'utf8');
}
return true;
} catch (error) {
// Fall back to custom HTML if diff2html-cli fails
console.warn(`Warning: diff2html-cli failed for ${relativePath}, using fallback`);
const fallbackHtml = generateFallbackHtml(result);
fs.writeFileSync(outputPath, fallbackHtml, 'utf8');
return true;
}
}
/**
* Generate fallback HTML diff when diff2html-cli fails
* @param {Object} result - Comparison result
* @returns {string} HTML content
*/
export function generateFallbackHtml(result) {
const { relativePath, status, diff, linesAdded, linesRemoved } = result;
// Build diff content HTML
let diffContent = '';
Eif (diff) {
diff.forEach((part) => {
const lines = part.value.split('\n');
lines.forEach((line, idx) => {
if (idx === lines.length - 1 && line === '') return;
const className = part.added ? 'added' : part.removed ? 'removed' : 'context';
diffContent += `<div class="line ${className}">${escapeHtml(line)}</div>`;
});
});
}
return renderTemplate('fallback.html', {
relativePath: relativePath,
statusUppercase: status.toUpperCase(),
diffContent: diffContent,
linesAdded: linesAdded,
linesRemoved: linesRemoved,
});
}
/**
* Generate file item HTML for the index page
* @param {Object} file - File object
* @param {boolean} isLink - Whether to render as a link
* @returns {string} HTML content
*/
function generateFileItem(file, isLink) {
const safeFileName = file.relativePath.replace(/[^a-zA-Z0-9]/g, '_') + '.html';
let statsText;
if (file.status === 'different') {
statsText = `-${file.linesRemoved} / +${file.linesAdded}`;
} else if (file.status === 'added') {
statsText = `+${file.linesAdded} lines`;
} else if (Ifile.status === 'removed') {
statsText = `-${file.linesRemoved} lines`;
} else {
statsText = 'No changes';
}
if (isLink) {
return `
<a href="${escapeHtml(safeFileName)}" class="file-item">
<span class="file-status ${file.status}">${file.status.toUpperCase()}</span>
<span class="file-name">${escapeHtml(file.relativePath)}</span>
<span class="file-stats">${statsText}</span>
</a>`;
}
return `
<div class="file-item identical-item">
<span class="file-status identical">IDENTICAL</span>
<span class="file-name">${escapeHtml(file.relativePath)}</span>
<span class="file-stats">${statsText}</span>
</div>`;
}
/**
* Generate the files list HTML for the index page
* @param {Object[]} filesWithDiffs - Files that have differences
* @param {Object[]} identicalFiles - Files that are identical
* @returns {string} HTML content
*/
function generateFilesList(filesWithDiffs, identicalFiles) {
let filesList = '';
// Show success banner if all files match
if (filesWithDiffs.length === 0) {
filesList += `
<div class="success-message">
ā
All files match baseline!
</div>`;
}
// Show files with differences (with links to diff pages)
if (filesWithDiffs.length > 0) {
filesList += `
<div class="files-list">
<h2>Files with Differences</h2>
${filesWithDiffs.map((file) => generateFileItem(file, true)).join('')}
</div>`;
}
// Show identical files (no links, just display)
Eif (identicalFiles.length > 0) {
const checkmark = filesWithDiffs.length === 0 ? ' ā' : '';
filesList += `
<div class="files-list">
<h2>Identical Files${checkmark}</h2>
${identicalFiles.map((file) => generateFileItem(file, false)).join('')}
</div>`;
}
return filesList;
}
/**
* Generate index HTML page for comparison report
* @param {Object} report - Full comparison report
* @returns {string} HTML content
*/
export function generateIndexHtml(report) {
const filesWithDiffs = report.files.filter((f) => f.status !== 'identical');
const identicalFiles = report.files.filter((f) => f.status === 'identical');
const filesList = generateFilesList(filesWithDiffs, identicalFiles);
return renderTemplate('index.html', {
reportName: report.name,
timestamp: new Date(report.timestamp).toLocaleString(),
sha: report.sha || 'unknown',
baselinePath: report.baselinePath,
sourcePath: report.sourcePath,
summaryTotal: report.summary.total,
summaryIdentical: report.summary.identical,
summaryDifferent: report.summary.different,
summaryAdded: report.summary.added,
summaryRemoved: report.summary.removed,
filesList: filesList,
});
}
/**
* Generate text report
* @param {Object} report - Full comparison report
* @returns {string} Text report content
*/
export function generateTextReport(report) {
let text = `${report.name} - Comparison Report\n`;
text += '='.repeat(50) + '\n\n';
text += `Timestamp: ${report.timestamp}\n`;
text += `Commit: ${report.sha || 'unknown'}\n`;
text += `Baseline: ${report.baselinePath}\n`;
text += `Source: ${report.sourcePath}\n\n`;
text += 'Summary:\n';
text += ` Total files: ${report.summary.total}\n`;
text += ` Identical: ${report.summary.identical}\n`;
text += ` Different: ${report.summary.different}\n`;
text += ` Added: ${report.summary.added}\n`;
text += ` Removed: ${report.summary.removed}\n\n`;
const filesWithDiffs = report.files.filter((f) => f.status !== 'identical');
if (filesWithDiffs.length > 0) {
text += 'Files with differences:\n';
text += '-'.repeat(50) + '\n';
filesWithDiffs.forEach((file) => {
text += `\n${file.relativePath}:\n`;
text += ` Status: ${file.status}\n`;
Eif (file.status === 'different') {
text += ` Lines added: ${file.linesAdded}\n`;
text += ` Lines removed: ${file.linesRemoved}\n`;
}
});
} else {
text += '\nā All files match baseline!\n';
}
return text;
}
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