add reset script

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

Diff for: src/channel/index.ts

@@ -18,6 +18,7 @@ import { openWorkspace, checkWorkspaceEmpty } from '../services/workspace'
 import { showOutput } from '../services/testRunner/output'
 import { exec } from '../services/node'
 import { WORKSPACE_ROOT, TUTORIAL_URL } from '../environment'
+import reset from '../services/git/reset'
 import getLastCommitHash from '../services/git/lastHash'
 
 const readFileAsync = promisify(readFile)
@@ -330,7 +331,7 @@ class Channel implements Channel {
         const hash = getLastCommitHash(position, tutorial?.levels || [])
 
         // load timeline until last pass commit
-        // TODO: run reset script
+        reset({ branch: tutorial?.config.repo.branch, hash })
 
         // if tutorial.config.reset.command, run it
         if (tutorial?.config?.reset?.command) {

Diff for: src/services/git/reset.ts

@@ -1,49 +1,74 @@
 import * as fs from 'fs'
-import { exec, exists } from '../node'
+import { promisify } from 'util'
+import { exec } from '../node'
+
+const removeFile = promisify(fs.unlink)
 
 interface Input {
   hash: string
   branch: string
 }
 
+const ignoreError = () => {}
+
 // note: attempted to do this as a bash script
 // but requires the bash script has git permissions
 const reset = async ({ branch, hash }: Input): Promise<void> => {
-  // TODO: capture branch
-  const localBranch = 'master'
-
-  // switch to an empty branch
-  await exec({
-    command: 'git checkout --orphan reset-orphan-branch',
-  })
-  // stash any current work
-  await exec({
-    command: 'git stash',
-  })
-  // remove any other files
-  await exec({
-    command: 'git rm -rf .',
-  })
-  // TODO: delete .gitignore
-
-  await exec({
-    command: `git branch -D ${localBranch}`,
-  })
-  await exec({
-    command: `git checkout -b ${localBranch}`,
-  })
-
-  // load git timeline
-  await exec({
-    command: `git fetch coderoad ${branch}`,
-  })
-  await exec({
-    command: `git merge coderoad/${localBranch}`,
-  })
-  // reset to target commit hash
-  await exec({
-    command: `git reset --hard ${hash}`,
-  })
+  const remote = 'coderoad'
+
+  try {
+    // if no git init, will initialize
+    // otherwise re-initializes git
+    await exec({ command: 'git init' }).catch(console.log)
+
+    // capture current branch
+    const hasBranch = await exec({ command: 'git branch --show-current' })
+    const localBranch = hasBranch.stdout
+    // check if coderoad remote exists
+    const hasRemote = await exec({ command: 'git remote -v' }).catch(console.warn)
+    if (!hasRemote || !hasRemote.stdout || !hasRemote.stdout.length) {
+      throw new Error('No remote found')
+    } else if (!hasRemote.stdout.match(new RegExp(remote))) {
+      throw new Error(`No "${remote}" remote found`)
+    }
+
+    // switch to an empty branch
+    await exec({
+      command: 'git checkout --orphan reset-orphan-branch',
+    })
+    // stash any current work
+    await exec({
+      command: 'git stash',
+    }).catch(ignoreError)
+
+    // remove any other files
+    await exec({
+      command: 'git rm -rf .',
+    }).catch(ignoreError)
+    await removeFile('.gitignore').catch(ignoreError)
+
+    await exec({
+      command: `git branch -D ${localBranch}`,
+    })
+    await exec({
+      command: `git checkout -b ${localBranch}`,
+    })
+
+    // load git timeline
+    await exec({
+      command: `git fetch coderoad ${branch}`,
+    })
+    await exec({
+      command: `git merge coderoad/${branch}`,
+    })
+    // reset to target commit hash
+    await exec({
+      command: `git reset --hard ${hash}`,
+    })
+  } catch (error) {
+    console.error('Error resetting')
+    console.error(error.message)
+  }
 }
 
 export default reset