extension.js

'use strict'

const { commands, window, workspace, env } = require('vscode')

exports.activate = ({ subscriptions }) => {
  const disposable = commands.registerCommand(
    'snippet-generator.generateSnippet',
    async () => {
      const editor = window.activeTextEditor

      if (!editor) {
        return window.showErrorMessage('No active text editor')
      }

      const selection = editor.document.getText(editor.selection)

      if (!selection.length) {
        return window.showErrorMessage('No selected text')
      }

      const name = await window.showInputBox({
        placeHolder: 'Please enter name (required)',
        validateInput: input => (input ? '' : 'Name is required'),
      })

      if (name === undefined) {
        return
      }

      const scope = await window.showInputBox({
        placeHolder: 'Please enter scope (optional)',
      })

      if (scope === undefined) {
        return
      }

      const prefix = await window.showInputBox({
        placeHolder: 'Please enter prefix (required)',
        validateInput: input => (input ? '' : 'Prefix is required'),
      })

      if (prefix === undefined) {
        return
      }

      const description = await window.showInputBox({
        placeHolder: 'Please enter description (optional)',
      })

      if (description === undefined) {
        return
      }

      const tabSize = workspace.getConfiguration('editor').get('tabSize')

      const spaces = new RegExp(` {${tabSize}}`, 'g')

      const snippetObj = {
        [name]: {
          ...(scope && { scope }),
          prefix,
          body: selection
            .split(/\r?\n/)
            .map(line => line.replace(spaces, '\t')),
          ...(description && { description }),
        },
      }

      const snippetJSON = JSON.stringify(snippetObj, null, tabSize)
        .split('\n')
        .slice(1, -1)
        .join('\n')

      env.clipboard.writeText(snippetJSON)

      window.showInformationMessage(
        'Snippet has been copied into the clipboard',
      )
    },
  )

  subscriptions.push(disposable)
}