nano-staged/lib/runner.js

Tiny tool to run commands for modified, staged, and committed git files.

import { createGitWorkflow } from './git-workflow.js'
import { createCmdRunner } from './cmd-runner.js'
import { createReporter } from './reporter.js'
import { createRenderer } from './renderer.js'
import { NanoStagedError } from './errors.js'

export function createRunner({ allowEmpty, git_paths, config, stream, files, type, cwd }) {
  const reporter = createReporter(stream)
  const renderer = createRenderer(stream, { isTTY: !process.env.CI })

  const runner = {
    async run() {
      const changes = [...files.changed, ...files.deleted]

      const gitWorkflow = createGitWorkflow({
        allowEmpty,
        rootPath: git_paths.root,
        dotPath: git_paths.dot,
      })

      const cmdRunner = createCmdRunner({
        rootPath: git_paths.root,
        files: files.working,
        config,
        type,
        cwd,
      })

      const cmdTasks = await cmdRunner.generateCmdTasks()

      if (!cmdTasks.some((task) => task.file_count > 0)) {
        reporter.error(new NanoStagedError('noMatchingFiles'))
        return
      }

      let enabled = false
      let revert = false
      let clear = true
      let errors = []
      let tasks = []

      tasks.push({
        title: `Preparing nano-staged`,
        run: async () => {
          try {
            await gitWorkflow.backupOriginalState()
          } catch (e) {
            enabled = true
            throw e
          }
        },
      })

      tasks.push({
        title: `Backing up unstaged changes for staged files`,
        run: async () => {
          try {
            await gitWorkflow.backupUnstagedFiles(changes)
          } catch (e) {
            revert = true
            throw e
          }
        },
        skipped: () => enabled || type === 'unstaged' || type === 'diff' || changes.length === 0,
      })

      tasks.push({
        title: `Running tasks for ${type} files`,
        run: async (task) => {
          task.tasks = cmdTasks

          try {
            await cmdRunner.run(task)
          } catch (e) {
            revert = true
            throw e
          }
        },
        skipped: () => enabled || revert,
      })

      tasks.push({
        title: `Applying modifications from tasks`,
        run: async () => {
          try {
            await gitWorkflow.applyModifications(files.working)
          } catch (e) {
            revert = true
            throw e
          }
        },
        skipped: () => enabled || revert || type === 'unstaged' || type === 'diff',
      })

      tasks.push({
        title: `Restoring unstaged changes for staged files`,
        run: async () => {
          try {
            await gitWorkflow.restoreUnstagedFiles(changes)
          } catch (e) {
            throw e
          }
        },
        skipped: () =>
          enabled || revert || type === 'unstaged' || type === 'diff' || changes.length === 0,
      })

      tasks.push({
        title: `Restoring to original state because of errors`,
        run: async () => {
          try {
            await gitWorkflow.restoreOriginalState()
          } catch (e) {
            clear = false
            throw e
          }
        },
        skipped: () => enabled || !revert,
      })

      tasks.push({
        title: `Cleaning up temporary to patch files`,
        run: async () => {
          try {
            await gitWorkflow.cleanUp()
          } catch (e) {
            throw e
          }
        },
        skipped: () => enabled || !clear,
      })

      for (const task of tasks) {
        if (task.skipped ? !task.skipped() : true) {
          renderer.start(task)

          try {
            task.state = 'run'
            await task.run(task)
            task.state = 'done'
          } catch (e) {
            task.state = 'fail'
            errors.push(e)
          }
        }
      }

      renderer.stop()

      if (errors.length) {
        throw errors
      }
    },
  }

  return runner
}