strip $ prompt prefix from shell snippets on copy to clipboard

znai-reactjs/src/doc-elements/code-snippets/SnippetContainer.jsx

@@ -19,7 +19,7 @@ import * as React from "react";
 
 import ClipboardJS from "clipboard";
 
-import { extractTextFromTokens } from "./codeUtils";
+import { extractTextFromTokens, stripShellPromptPrefix } from "./codeUtils";
 
 import { Icon } from "../icons/Icon";
 import { SnippetOptionallyScrollablePart } from "./SnippetOptionallyScrollablePart";
@@ -129,11 +129,11 @@ class SnippetContainer extends React.Component {
 
     this.clipboard = new ClipboardJS(this.copyToClipboardNode, {
       text: () => {
-        const { linesOfCode, tokensForClipboardProvider } = this.props;
+        const { lang, linesOfCode, tokensForClipboardProvider } = this.props;
         this.setState({ displayCopied: true });
         this.startRemoveFeedbackTimer();
 
-        return extractTextFromTokens(tokensToUse());
+        return stripShellPromptPrefix(extractTextFromTokens(tokensToUse()), lang);
 
         function tokensToUse() {
           if (tokensForClipboardProvider) {

znai-reactjs/src/doc-elements/code-snippets/codeUtils.js

@@ -170,6 +170,26 @@ export function extractTextFromTokens(tokens) {
     return tokens.map(t => tokenToText(t)).join('')
 }
 
+const shellLangs = new Set(['bash', 'sh', 'shell', 'shell-session', 'zsh', 'console'])
+
+/**
+ * strips the optional "$ " prompt prefix from each line of a shell snippet,
+ * so that copied commands can be pasted into a terminal as-is
+ * @param text snippet text
+ * @param lang snippet language
+ * @return {String}
+ */
+export function stripShellPromptPrefix(text, lang) {
+    if (!lang || !shellLangs.has(lang.toLowerCase())) {
+        return text
+    }
+
+    return text
+        .split('\n')
+        .map(line => line.replace(/^(\s*)\$ /, '$1'))
+        .join('\n')
+}
+
 function tokenToText(token) {
     if (typeof token === 'string') {
         return token

znai-reactjs/src/doc-elements/code-snippets/stripShellPromptPrefix.test.js

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2026 znai maintainers
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { describe, it, expect } from 'vitest';
+
+import { stripShellPromptPrefix } from "./codeUtils";
+
+describe("stripShellPromptPrefix", () => {
+    it("removes the $ prompt prefix from bash snippet lines", () => {
+        const text = '$ echo hello\n$ ls -la'
+        expect(stripShellPromptPrefix(text, 'bash')).toEqual('echo hello\nls -la')
+    })
+
+    it("keeps lines without a prompt untouched, e.g. line continuations and output", () => {
+        const text = '$ my-tool run \\\n' +
+            '  -flag value\n' +
+            'output line\n' +
+            '\n' +
+            '$ another-command'
+        expect(stripShellPromptPrefix(text, 'sh')).toEqual(
+            'my-tool run \\\n' +
+            '  -flag value\n' +
+            'output line\n' +
+            '\n' +
+            'another-command')
+    })
+
+    it("preserves indentation before the prompt", () => {
+        expect(stripShellPromptPrefix('  $ echo indented', 'bash')).toEqual('  echo indented')
+    })
+
+    it("does not remove $ that is part of a variable reference", () => {
+        expect(stripShellPromptPrefix('$HOME/bin/tool', 'bash')).toEqual('$HOME/bin/tool')
+    })
+
+    it("does not change snippets of other languages", () => {
+        expect(stripShellPromptPrefix('$ looks like prompt', 'java')).toEqual('$ looks like prompt')
+        expect(stripShellPromptPrefix('$ looks like prompt', undefined)).toEqual('$ looks like prompt')
+    })
+})