Create TagInput component

app/soapbox/components/ui/tag-input/tag-input.tsx

@@ -0,0 +1,70 @@
+import React, { useState } from 'react';
+
+import HStack from '../hstack/hstack';
+
+import Tag from './tag';
+
+interface ITagInput {
+  tags: string[],
+  onChange: (tags: string[]) => void,
+  placeholder?: string,
+}
+
+/** Manage a list of tags. */
+// https://blog.logrocket.com/building-a-tag-input-field-component-for-react/
+const TagInput: React.FC<ITagInput> = ({ tags, onChange, placeholder }) => {
+  const [input, setInput] = useState('');
+
+  const handleTagDelete = (tag: string) => {
+    onChange(tags.filter(item => item !== tag));
+  };
+
+  const handleKeyDown: React.KeyboardEventHandler = (e) => {
+    const { key } = e;
+    const trimmedInput = input.trim();
+
+    if (key === 'Tab') {
+      e.preventDefault();
+    }
+
+    if ([',', 'Tab', 'Enter'].includes(key) && trimmedInput.length && !tags.includes(trimmedInput)) {
+      e.preventDefault();
+      onChange([...tags, trimmedInput]);
+      setInput('');
+    }
+
+    if (key === 'Backspace' && !input.length && tags.length) {
+      e.preventDefault();
+      const tagsCopy = [...tags];
+      tagsCopy.pop();
+
+      onChange(tagsCopy);
+    }
+  };
+
+  return (
+    <div className='mt-1 relative shadow-sm'>
+      <HStack
+        className='p-2 pb-0 text-gray-900 dark:text-gray-100 placeholder:text-gray-600 dark:placeholder:text-gray-600 block w-full sm:text-sm dark:ring-1 dark:ring-gray-800 focus:ring-primary-500 focus:border-primary-500 dark:focus:ring-primary-500 dark:focus:border-primary-500 rounded-md bg-white dark:bg-gray-900 border-gray-400 dark:border-gray-800'
+        space={2}
+        wrap
+      >
+        {tags.map((tag, i) => (
+          <div className='mb-2'>
+            <Tag tag={tag} onDelete={handleTagDelete} />
+          </div>
+        ))}
+
+        <input
+          className='p-1 mb-2 h-8 flex-grow bg-transparent outline-none'
+          value={input}
+          placeholder={placeholder}
+          onChange={e => setInput(e.target.value)}
+          onKeyDown={handleKeyDown}
+        />
+      </HStack>
+    </div>
+  );
+};
+
+export default TagInput;

app/soapbox/components/ui/tag-input/tag.tsx

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+import React from 'react';
+
+import IconButton from '../icon-button/icon-button';
+import Text from '../text/text';
+
+interface ITag {
+  /** Name of the tag. */
+  tag: string,
+  /** Callback when the X icon is pressed. */
+  onDelete: (tag: string) => void,
+}
+
+/** A single editable Tag (used by TagInput). */
+const Tag: React.FC<ITag> = ({ tag, onDelete }) => {
+  return (
+    <div className='inline-flex p-1 rounded bg-primary-500 items-center whitespace-nowrap'>
+      <Text theme='white'>{tag}</Text>
+
+      <IconButton
+        iconClassName='w-4 h-4'
+        src={require('@tabler/icons/x.svg')}
+        onClick={() => onDelete(tag)}
+        transparent
+      />
+    </div>
+  );
+};
+
+export default Tag;