Implementing programmable code snippets in VSCode - `Code Recycle`

#vscode #parser #snippet

How to customize code snippets in the editor? Provide the completion prefix, provide the completion content, and then you can use it directly
But specific content can only be inserted in the current file and input location, sometimes it may not meet the requirements
If we want to introduce a service that automatically creates when it does not exist, we can only rely on ourselves because the code snippet is static and cannot be programmed
If you have such a need and want to implement it, why not give it a try with Code Recycle

Import a service

Create code snippet configuration

{
    "prefix": [
        "import"
    ],
    "body": " ",
    "regexp": {
        "pattern": "\\.([\\p{L}\\p{N}]+)",
        "flag": "u"
    },
    "pattern": "**/*.ts",
    "dynamicMode": true,
    "script": "./import-class.ts"
}

Implement call function

let fn: ScriptFunction = async (util, rule, host, injector) => {
  let importName = util.documentContext.snippetParameters![1];
  let _ = util.lodash;
  let className = _.upperFirst(_.camelCase(importName));
  let rootCtx = util.initContext();
  await util.changeList(
    [
    // Check if the class exists
      {
        path: `*.ts`,
        name: 'classPath',
        glob: true,
        list: [
          {
            query: `export class ${className}`,
            mode: 'like',
            optional: true,
            callback(context, index) {
              let classPathCtx = context.getContext('root.classPath');
              classPathCtx.data = context.node!.path!;
            },
          },
        ],
      },
    ],
    rootCtx
  );
  let filePath = rootCtx.getContext('root.classPath').data;
  if (!filePath) {
    // Create from template
    await util.changeList([
      {
        type: 'copy',
        from: join(__dirname, './template/__name@dasherize__.ts'),
        to: './',
        pathTemplate: '@angular-devkit',
        contentTemplate: '@angular-devkit',
        templateContext: { name: importName },
      },
    ]);
    let changedRecord = host.records();
    filePath = util.path.normalize((changedRecord[0] as any).path);
  }
  let pathRelative = require('../shared/path-relative');
  // insert reference
  let changed = await util.changeList([
    {
      path: util.filePathGroup.currentPath,
      list: [
        {
          range: [0, 0],
          replace: `import {${className}} from '${pathRelative(util.filePathGroup.currentPath, filePath, util)}'\n`,
        },
        {
          range: util.documentContext.insertRange![0].range,
          replace: `let ${importName} = new ${className}()`,
        },
      ],
    },
  ]);

  await util.updateChangeList(changed);
};

When entering import.hello in the ts file in the editor, and completing the completion, the Hello class will be automatically introduced and initialized

More?

examples
The tool currently supports the execution of CLI and VSCode Extension. Script Support yaml/js/ts
You can view document learn more
If you want to see more instances, you can visit the repository view and Run
If you are already interested, you can start quickly

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Implementing programmable code snippets in VSCode - `Code Recycle`

Import a service

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