add new tool markdown diff

components.d.ts

@@ -121,6 +121,7 @@ declare module '@vue/runtime-core' {
     LoremIpsumGenerator: typeof import('./src/tools/lorem-ipsum-generator/lorem-ipsum-generator.vue')['default']
     MacAddressGenerator: typeof import('./src/tools/mac-address-generator/mac-address-generator.vue')['default']
     MacAddressLookup: typeof import('./src/tools/mac-address-lookup/mac-address-lookup.vue')['default']
+    MarkdownDiff: typeof import('./src/tools/markdown-diff/markdown-diff.vue')['default']
     MarkdownToHtml: typeof import('./src/tools/markdown-to-html/markdown-to-html.vue')['default']
     MathEvaluator: typeof import('./src/tools/math-evaluator/math-evaluator.vue')['default']
     MenuBar: typeof import('./src/tools/html-wysiwyg-editor/editor/menu-bar.vue')['default']

locales/de.yml

@@ -333,6 +333,9 @@ tools:
   json-diff:
     title: JSON-Unterschied
     description: Vergleiche zwei JSON-Objekte und erhalte die Unterschiede zwischen ihnen.
+  markdown-diff:
+    title: Markdown-Unterschied
+    description: Vergleiche zwei Markdown-Dokumente und sieh die Unterschiede zwischen ihnen.
   jwt-parser:
     title: JWT-Parser
     description: >-

locales/en.yml

@@ -289,6 +289,10 @@ tools:
     title: JSON diff
     description: Compare two JSON objects and get the differences between them.
 
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.
+
   jwt-parser:
     title: JWT parser
     description: Parse and decode your JSON Web Token (jwt) and display its content.

locales/es.yml

@@ -70,3 +70,7 @@ tools:
     measurement: Measurement
     text: Text
     data: Data
+
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.

locales/fr.yml

@@ -65,6 +65,10 @@ tools:
     text: Texte
     data: Données
 
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.
+
   token-generator:
     title: Générateur de token
     description: >-

locales/no.yml

@@ -289,6 +289,10 @@ tools:
     title: JSON diff
     description: Sammenlign to JSON objekter og finn forskjellene mellom dem.
 
+  markdown-diff:
+    title: Markdown diff
+    description: Sammenlign to Markdown-dokumenter og vis forskjellene mellom dem.
+
   jwt-parser:
     title: JWT parser
     description: Parse og dekode et JSON Web Token (jwt) og vis innholdet.

locales/pt.yml

@@ -70,3 +70,7 @@ tools:
     measurement: 'Medidas'
     text: 'Texto'
     data: 'Dados'
+
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.

locales/uk.yml

@@ -70,3 +70,7 @@ tools:
     measurement: Вимірювання
     text: Текст
     data: Дані
+
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.

locales/vi.yml

@@ -281,6 +281,10 @@ tools:
     title: So sánh JSON
     description: So sánh hai đối tượng JSON và lấy ra sự khác biệt giữa chúng.
 
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.
+
   jwt-parser:
     title: Giải mã JWT
     description: Giải mã và hiển thị nội dung của JSON Web Token (jwt).

locales/zh.yml

@@ -285,6 +285,9 @@ tools:
   json-diff:
     title: JSON 差异比较
     description: 比较两个JSON对象并获得它们之间的差异。
+  markdown-diff:
+    title: Markdown diff
+    description: Compare two Markdown documents and see the differences between them.
   jwt-parser:
     title: JWT 解析器
     description: 解析和解码JSON Web Token（jwt）并显示其内容。

src/tools/index.ts

@@ -1,6 +1,7 @@
 import { tool as base64FileConverter } from './base64-file-converter';
 import { tool as base64StringConverter } from './base64-string-converter';
 import { tool as basicAuthGenerator } from './basic-auth-generator';
+import { tool as markdownDiff } from './markdown-diff';
 import { tool as emailNormalizer } from './email-normalizer';
 
 import { tool as asciiTextDrawer } from './ascii-text-drawer';
@@ -116,6 +117,7 @@ export const toolsByCategory: ToolCategory[] = [
       xmlToJson,
       jsonToXml,
       markdownToHtml,
+      markdownDiff,
     ],
   },
   {

src/tools/markdown-diff/index.ts

@@ -0,0 +1,13 @@
+import { Markdown } from '@vicons/tabler';
+import { defineTool } from '../tool';
+import { translate } from '@/plugins/i18n.plugin';
+
+export const tool = defineTool({
+  name: translate('tools.markdown-diff.title'),
+  path: '/markdown-diff',
+  description: translate('tools.markdown-diff.description'),
+  keywords: ['markdown', 'diff', 'compare', 'difference', 'markdown diff', 'md', 'text'],
+  component: () => import('./markdown-diff.vue'),
+  icon: Markdown,
+  createdAt: new Date('2026-05-21'),
+});

src/tools/markdown-diff/markdown-diff.constants.test.ts

@@ -0,0 +1,12 @@
+import { describe, expect, it } from 'vitest';
+import { modifiedMarkdown, originalMarkdown } from './markdown-diff.constants';
+
+describe('markdown-diff constants', () => {
+  it('provides different default Markdown documents', () => {
+    expect(originalMarkdown).toContain('# Release notes');
+    expect(originalMarkdown).toContain('| user | host | plugin |');
+    expect(modifiedMarkdown).toContain('# Release notes');
+    expect(modifiedMarkdown).toContain('```sql');
+    expect(modifiedMarkdown).not.toBe(originalMarkdown);
+  });
+});

src/tools/markdown-diff/markdown-diff.constants.ts

@@ -0,0 +1,48 @@
+export const originalMarkdown = `# Release notes
+
+## Added
+
+- JSON export for reports
+- Keyboard shortcuts for navigation
+- Markdown table previews
+
+## Fixed
+
+- Preserve whitespace in code blocks
+
+## Plugin support
+
+| user | host | plugin |
+| --- | --- | --- |
+| mysql.infoschema | localhost | caching_sha2_password |
+| mysql.session | localhost | caching_sha2_password |
+| mysql.sys | localhost | caching_sha2_password |
+
+\`inline code\` stays readable in preview mode.
+`;
+
+export const modifiedMarkdown = `# Release notes
+
+## Added
+
+- JSON and CSV export for reports
+- Keyboard shortcuts for navigation
+- Dark mode support for charts
+- Markdown table previews
+
+## Fixed
+
+- Preserve whitespace in fenced code blocks
+
+## Plugin support
+
+| user | host | plugin |
+| --- | --- | --- |
+| mysql.session | localhost | caching_sha2_password |
+| mysql.sys | localhost | caching_sha2_password |
+
+\`\`\`sql
+select user, host, plugin
+from mysql.user;
+\`\`\`
+`;

src/tools/markdown-diff/markdown-diff.e2e.spec.ts

@@ -0,0 +1,33 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('Tool - Markdown diff', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('/markdown-diff');
+  });
+
+  test('Has correct title', async ({ page }) => {
+    await expect(page).toHaveTitle('Markdown diff - IT Tools', { timeout: 15000 });
+  });
+
+  test('Diff editor is visible with two editable panes', async ({ page }) => {
+    await expect(page.getByTestId('markdown-diff-editor')).toBeVisible();
+
+    await expect(page.locator('.monaco-diff-editor')).toBeVisible();
+    await expect(page.locator('.monaco-editor textarea.inputarea')).toHaveCount(2);
+  });
+
+  test('Preview mode shows rendered source and modified Markdown', async ({ page }) => {
+    await page.getByTestId('preview').click();
+
+    await expect(page.getByTestId('markdown-preview')).toBeVisible();
+    await expect(page.getByTestId('source-markdown-preview')).toBeVisible();
+    await expect(page.getByTestId('modified-markdown-preview')).toBeVisible();
+    await expect(page.getByTestId('source-markdown-preview').locator('table')).toBeVisible();
+    await expect(page.getByTestId('modified-markdown-preview')).toContainText('caching_sha2_password');
+
+    await page.getByTestId('code').click();
+
+    await expect(page.getByTestId('markdown-diff-editor')).toBeVisible();
+    await expect(page.locator('.monaco-diff-editor')).toBeVisible();
+  });
+});

src/tools/markdown-diff/markdown-diff.vue

@@ -0,0 +1,142 @@
+<template>
+  <div class="markdown-diff-tool">
+    <div flex justify-center mb-4>
+      <c-buttons-select
+        v-model:value="mode"
+        :options="modeOptions"
+        size="small"
+      />
+    </div>
+
+    <c-card v-if="mode === 'code'" w-full important:flex-1 important:pa-0>
+      <c-diff-editor
+        v-model:original="sourceMarkdown"
+        v-model:modified="targetMarkdown"
+        test-id="markdown-diff-editor"
+        language="markdown"
+        height="clamp(620px, 72vh, 820px)"
+      />
+    </c-card>
+
+    <c-card v-else data-test-id="markdown-preview" w-full>
+      <div class="markdown-preview-grid">
+        <section>
+          <h3>Source Markdown</h3>
+          <div class="markdown-preview-pane" data-test-id="source-markdown-preview">
+            <c-markdown :markdown="sourceMarkdown" />
+          </div>
+        </section>
+
+        <section>
+          <h3>Modified Markdown</h3>
+          <div class="markdown-preview-pane" data-test-id="modified-markdown-preview">
+            <c-markdown :markdown="targetMarkdown" />
+          </div>
+        </section>
+      </div>
+    </c-card>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue';
+import { modifiedMarkdown, originalMarkdown } from './markdown-diff.constants';
+
+type MarkdownDiffMode = 'code' | 'preview';
+
+const mode = ref<MarkdownDiffMode>('code');
+const sourceMarkdown = ref(originalMarkdown);
+const targetMarkdown = ref(modifiedMarkdown);
+
+const modeOptions: Array<{ label: string; value: MarkdownDiffMode }> = [
+  { label: 'Code', value: 'code' },
+  { label: 'Preview', value: 'preview' },
+];
+</script>
+
+<style lang="less" scoped>
+.markdown-preview-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 24px;
+
+  section {
+    min-width: 0;
+  }
+
+  h3 {
+    margin: 0 0 12px;
+    font-size: 18px;
+    font-weight: 600;
+  }
+}
+
+.markdown-diff-tool {
+  width: 100%;
+  max-width: 1200px;
+  flex: 1 1 1200px !important;
+}
+
+.markdown-preview-pane {
+  min-height: clamp(620px, 72vh, 820px);
+  padding: 18px;
+  border: 1px solid #d8dee8;
+  border-radius: 8px;
+  overflow: auto;
+}
+
+:deep(.markdown-preview-pane) {
+  line-height: 1.65;
+}
+
+:deep(.markdown-preview-pane > div > *:first-child) {
+  margin-top: 0;
+}
+
+:deep(.markdown-preview-pane > div > *:last-child) {
+  margin-bottom: 0;
+}
+
+:deep(.markdown-preview-pane table) {
+  width: 100%;
+  border-collapse: collapse;
+  margin: 16px 0;
+}
+
+:deep(.markdown-preview-pane th),
+:deep(.markdown-preview-pane td) {
+  padding: 10px 12px;
+  border: 1px solid #cfd6e2;
+  text-align: left;
+}
+
+:deep(.markdown-preview-pane th) {
+  font-weight: 600;
+  background: rgb(248 250 252);
+}
+
+:deep(.markdown-preview-pane code) {
+  padding: 2px 5px;
+  border-radius: 4px;
+  background: rgb(241 245 249);
+}
+
+:deep(.markdown-preview-pane pre) {
+  padding: 14px;
+  border-radius: 6px;
+  overflow: auto;
+  background: rgb(15 23 42);
+}
+
+:deep(.markdown-preview-pane pre code) {
+  padding: 0;
+  color: rgb(226 232 240);
+  background: transparent;
+}
+
+@media (max-width: 900px) {
+  .markdown-preview-grid {
+    grid-template-columns: 1fr;
+  }
+}
+</style>

src/ui/c-buttons-select/c-buttons-select.vue

@@ -51,7 +51,7 @@ function selectOption(option: CButtonSelectOption<T>) {
         :tooltip="option.tooltip"
       >
         <c-button
-          :test-id="option.value"
+          :data-test-id="option.value"
           :size="size"
           :type="option.value === value ? 'primary' : 'default'"
           @click="selectOption(option)"