diff-tool/index.html at main · t4net-crawbot/diff-tool · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Diff Tool — Instant Text Comparison</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;background:#0d1117;color:#c9d1d9;min-height:100vh}
.header{text-align:center;padding:24px 16px 12px;border-bottom:1px solid #21262d}
.header h1{font-size:1.5rem;color:#58a6ff;margin-bottom:4px}
.header p{color:#8b949e;font-size:.85rem}
.header a{color:#58a6ff;text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:16px}
.toolbar{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap;align-items:center}
.btn{padding:6px 14px;border:1px solid #30363d;border-radius:6px;background:#21262d;color:#c9d1d9;cursor:pointer;font-size:.8rem;transition:background .15s}
.btn:hover{background:#30363d}
.btn-primary{background:#238636;border-color:#238636;color:#fff}
.btn-primary:hover{background:#2ea043}
.panes{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:768px){.panes{grid-template-columns:1fr}}
.pane-header{display:flex;justify-content:space-between;align-items:center;padding:6px 10px;background:#161b22;border:1px solid #21262d;border-radius:6px 6px 0 0;font-size:.8rem;color:#8b949e}
.pane-header .label{font-weight:600;color:#c9d1d9}
textarea{width:100%;height:300px;background:#0d1117;color:#c9d1d9;border:1px solid #21262d;border-top:none;border-radius:0 0 6px 6px;padding:10px;font-family:'SF Mono',Monaco,'Cascadia Code',monospace;font-size:.82rem;resize:vertical;outline:none}
textarea:focus{border-color:#58a6ff}
.results{margin-top:16px}
.stats{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px;padding:10px 14px;background:#161b22;border:1px solid #21262d;border-radius:6px;font-size:.82rem}
.stats .stat{display:flex;align-items:center;gap:6px}
.stats .added{color:#3fb950}.stats .removed{color:#f85149}.stats .changed{color:#d29922}.stats .unchanged{color:#8b949e}
.diff-output{background:#161b22;border:1px solid #21262d;border-radius:6px;overflow:hidden}
.diff-line{display:flex;font-family:'SF Mono',Monaco,'Cascadia Code',monospace;font-size:.78rem;min-height:22px;line-height:22px}
.diff-line .ln{min-width:48px;text-align:right;padding:0 8px;color:#484f58;background:#0d1117;user-select:none;border-right:1px solid #21262d}
.diff-line .content{padding:0 10px;white-space:pre-wrap;word-break:break-all;flex:1}
.diff-line.added{background:rgba(46,160,67,.15)}.diff-line.added .content{color:#aff5b4}
.diff-line.removed{background:rgba(248,81,73,.15)}.diff-line.removed .content{color:#ffdcd7}
.diff-line.unchanged .content{color:#8b949e}
.diff-line.section{background:#161b22;color:#d29922;padding:4px 10px;font-weight:600}
.diff-line.section .ln{background:#161b22}
.footer{text-align:center;padding:20px;color:#484f58;font-size:.75rem}
.drag-over{border-color:#58a6ff!important;box-shadow:0 0 0 2px rgba(88,166,255,.3)}
#mode-toggle{margin-left:auto;display:flex;align-items:center;gap:6px;font-size:.8rem;color:#8b949e}
#mode-toggle input[type=checkbox]{accent-color:#238636}
</style>
</head>
<body>
<div class="header">
<h1>⚡ Diff Tool</h1>
<p>Instant text comparison. No tracking. No server. Works offline.</p>
<p style="margin-top:4px;font-size:.75rem"><a href="https://github.com/t4net-crawbot/diff-tool">Source on GitHub</a></p>
</div>
<div class="container">
<div class="toolbar">
<button class="btn btn-primary" onclick="runDiff()">Compare</button>
<button class="btn" onclick="swapPanes()">⇄ Swap</button>
<button class="btn" onclick="clearAll()">Clear</button>
<button class="btn" onclick="loadSample()">Load Sample</button>
<div id="mode-toggle">
<label><input type="checkbox" id="char-mode"> Character diff</label>
</div>
</div>
<div class="panes">
<div>
<div class="pane-header"><span class="label">Original</span><span id="left-count">0 lines</span></div>
<textarea id="left" placeholder="Paste original text here..." spellcheck="false"></textarea>
</div>
<div>
<div class="pane-header"><span class="label">Modified</span><span id="right-count">0 lines</span></div>
<textarea id="right" placeholder="Paste modified text here..." spellcheck="false"></textarea>
</div>
</div>
<div class="results" id="results"></div>
</div>
<div class="footer">Diff Tool — Zero dependencies, zero tracking, zero server calls. 100% client-side.</div>
<script>
const left=document.getElementById('left'),right=document.getElementById('right');
const lc=document.getElementById('left-count'),rc=document.getElementById('right-count');
left.addEventListener('input',()=>{lc.textContent=left.value.split('\n').length+' lines'});
right.addEventListener('input',()=>{rc.textContent=right.value.split('\n').length+' lines'});
['dragover','dragenter'].forEach(e=>{left.addEventListener(e,ev=>{ev.preventDefault();left.classList.add('drag-over')});right.addEventListener(e,ev=>{ev.preventDefault();right.classList.add('drag-over')})});
['dragleave','drop'].forEach(e=>{left.addEventListener(e,()=>left.classList.remove('drag-over'));right.addEventListener(e,()=>right.classList.remove('drag-over'))});
[left,right].forEach(ta=>{ta.addEventListener('drop',e=>{e.preventDefault();const f=e.dataTransfer.files[0];if(f&&f.type.startsWith('text/')){const r=new FileReader();r.onload=()=>{ta.value=r.result;ta.dispatchEvent(new Event('input'))};r.readAsText(f)}})});
function swapPanes(){const t=left.value;left.value=right.value;right.value=t;left.dispatchEvent(new Event('input'));right.dispatchEvent(new Event('input'))}
function clearAll(){left.value='';right.value='';left.dispatchEvent(new Event('input'));right.dispatchEvent(new Event('input'));document.getElementById('results').innerHTML=''}
function loadSample(){left.value=`function greet(name) {
  console.log("Hello, " + name);
  return true;
}

function add(a, b) {
  return a + b;
}

const items = [1, 2, 3, 4, 5];
const total = items.reduce((sum, n) => sum + n, 0);`;right.value=`function greet(name, greeting = "Hello") {
  console.log(greeting + ", " + name + "!");
  return { success: true, name };
}

function add(...nums) {
  return nums.reduce((sum, n) => sum + n, 0);
}

function multiply(a, b) {
  return a * b;
}

const items = [1, 2, 3, 4, 5, 6];
const total = items.reduce((sum, n) => sum + n, 0);
console.log("Total:", total);`;left.dispatchEvent(new Event('input'));right.dispatchEvent(new Event('input'));runDiff()}

function runDiff(){
  const a=left.value.split('\n'),b=right.value.split('\n'),charMode=document.getElementById('char-mode').checked;
  const {hunks,stats}=computeDiff(a,b);
  let html='<div class="stats">';
  html+=`<span class="stat added">+${stats.added} added</span>`;
  html+=`<span class="stat removed">-${stats.removed} removed</span>`;
  html+=`<span class="stat unchanged">~${stats.unchanged} unchanged</span>`;
  html+=`<span class="stat">Similarity: ${stats.total?Math.round(stats.unchanged/stats.total*100):100}%</span>`;
  html+='</div><div class="diff-output">';
  for(const h of hunks){
    if(h.type==='section'){html+=`<div class="diff-line section"><span class="ln"></span><span class="content">${esc(h.text)}</span></div>`;continue}
    if(h.type==='unchanged'){html+=`<div class="diff-line unchanged"><span class="ln">${h.lnA}</span><span class="ln">${h.lnB}</span><span class="content">${esc(h.text)}</span></div>`;continue}
    if(h.type==='removed'){
      if(charMode&&h.pairText){const ci=charDiff(h.text,h.pairText);html+=`<div class="diff-line removed"><span class="ln">${h.lnA}</span><span class="ln"></span><span class="content">${ci.aHtml}</span></div>`;continue}
      html+=`<div class="diff-line removed"><span class="ln">${h.lnA}</span><span class="ln"></span><span class="content">${esc(h.text)}</span></div>`;continue}
    if(h.type==='added'){
      if(charMode&&h.pairText){const ci=charDiff(h.pairText,h.text);html+=`<div class="diff-line added"><span class="ln"></span><span class="ln">${h.lnB}</span><span class="content">${ci.bHtml}</span></div>`;continue}
      html+=`<div class="diff-line added"><span class="ln"></span><span class="ln">${h.lnB}</span><span class="content">${esc(h.text)}</span></div>`;continue}
  }
  html+='</div>';
  document.getElementById('results').innerHTML=html;
}

function charDiff(a,b){
  const dp=[];
  for(let i=0;i<=a.length;i++){dp[i]=[i];for(let j=1;j<=b.length;j++){if(i===0){dp[i][j]=j;continue}dp[i][j]=a[i-1]===b[j-1]?dp[i-1][j-1]:1+Math.min(dp[i-1][j],dp[i][j-1],dp[i-1][j-1])}}
  let i=a.length,j=b.length,aHtml='',bHtml='';
  while(i>0||j>0){
    if(i>0&&j>0&&a[i-1]===b[j-1]){aHtml=esc(a[i-1])+aHtml;bHtml=esc(b[j-1])+bHtml;i--;j--}
    else if(i>0&&j>0&&dp[i-1][j-1]<=dp[i-1][j]&&dp[i-1][j-1]<=dp[i][j-1]){aHtml=`<span style="background:rgba(248,81,73,.3)">${esc(a[i-1])}</span>`+aHtml;bHtml=`<span style="background:rgba(46,160,67,.3)">${esc(b[j-1])}</span>`+bHtml;i--;j--}
    else if(i>0&&dp[i-1][j]<=dp[i][j-1]){aHtml=`<span style="background:rgba(248,81,73,.3)">${esc(a[i-1])}</span>`+aHtml;i--}
    else{bHtml=`<span style="background:rgba(46,160,67,.3)">${esc(b[j-1])}</span>`+bHtml;j--}
  }
  return{aHtml,bHtml}
}

function computeDiff(a,b){
  const n=a.length,m=b.length,dp=[];
  for(let i=0;i<=n;i++){dp[i]=[];for(let j=0;j<=m;j++){if(i===0)dp[i][j]=j;else if(j===0)dp[i][j]=i;else dp[i][j]=a[i-1]===b[j-1]?dp[i-1][j-1]:1+Math.min(dp[i-1][j],dp[i][j-1],dp[i-1][j-1])}}
  let i=n,j=m,ops=[];
  while(i>0||j>0){if(i>0&&j>0&&a[i-1]===b[j-1]){ops.unshift({type:'eq',lnA:i,lnB:j,text:a[i-1]});i--;j--}else if(i>0&&j>0&&dp[i-1][j-1]<=dp[i-1][j]&&dp[i-1][j-1]<=dp[i][j-1]){ops.unshift({type:'mod',lnA:i,lnB:j,aText:a[i-1],bText:b[j-1]});i--;j--}else if(j>0&&(i===0||dp[i][j-1]<=dp[i-1][j])){ops.unshift({type:'add',lnB:j,text:b[j-1]});j--}else{ops.unshift({type:'del',lnA:i,text:a[i-1]});i--}}
  const hunks=[];let ctx=3;
  let groups=[],g=[];
  for(let k=0;k<ops.length;k++){
    const op=ops[k];
    if(op.type==='eq'){g.push(op)}
    else{if(g.length>ctx)groups.push({gap:g.slice(0,g.length-ctx),ops:[]});else groups.push({gap:[],ops:[]});if(g.length>ctx)g=g.slice(-ctx);for(const x of g)groups[groups.length-1].ops.push(x);g=[];groups[groups.length-1].ops.push(op)}
  }
  if(g.length>0){if(groups.length===0)groups.push({gap:[],ops:[]});for(const x of g)groups[groups.length-1].ops.push(x)}
  let lastEnd=0;
  for(let gi=0;gi<groups.length;gi++){const grp=groups[gi];const prevOps=ops.slice(lastEnd,ops.indexOf(grp.ops[0]));const gapStart=ops.indexOf(grp.ops[0])-grp.gap.length;if(gapStart>lastEnd)hunks.push({type:'section',text:`@@ ${gapStart+1} lines skipped @@`});for(const op of grp.ops){
    if(op.type==='eq')hunks.push({type:'unchanged',lnA:op.lnA,lnB:op.lnB,text:op.text});
    else if(op.type==='del')hunks.push({type:'removed',lnA:op.lnA,text:op.aText});
    else if(op.type==='add')hunks.push({type:'added',lnB:op.lnB,text:op.text});
    else if(op.type==='mod'){hunks.push({type:'removed',lnA:op.lnA,text:op.aText,pairText:op.bText});hunks.push({type:'added',lnB:op.lnB,text:op.bText,pairText:op.aText})}
  }lastEnd=ops.indexOf(grp.ops[grp.ops.length-1])+1}
  let added=0,removed=0,unchanged=0;
  for(const op of ops){if(op.type==='add')added++;else if(op.type==='del')removed++;else if(op.type==='eq')unchanged++;else if(op.type==='mod'){added++;removed++}}
  return{hunks,stats:{added,removed,unchanged,total:Math.max(n,m)}}
}

function esc(s){return s.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;')}
</script>
</body>
</html>