Subtree splitter action

.gitignore

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+/node_modules/
+splitsh

LICENSE

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+MIT License
+
+Copyright (c) 2021 Jeroen Thora
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# subtree-splitter action
+
+This actions synchronizes a monolithic repository to standalone repositories by using [splitsh-lite](https://github.com/splitsh/lite).
+
+## Usage
+
+### Inputs
+
+> Specify using `with` keyword
+
+* `config-path` - **(Required)** Location of the subtree split mapping configuration
+* `source-branch` - Source branch to execute the subtree split from
+
+### Example workflow
+
+#### Configuration
+
+Create a configuration file with the mapping of the different subtree splits. Each subtree split item contains a name (must be unique), 
+directory in the current repository and a target git repository.
+
+```json
+{
+    "subtree-splits": [
+        {
+            "name": "core",
+            "directory": "src/Core",
+            "target": "[email protected]:example/core-package.git"
+        }
+    ]
+}
+
+```
+
+#### Workflow
+
+Example workflow to sync commits and tags.
+
+```yaml
+on:
+    push:
+    create:
+        tags:
+            - '*'
+    delete:
+        tags:
+            - '*'
+
+jobs:
+    sync_commits:
+        runs-on: ubuntu-latest
+        name: Sync commits
+        steps:
+            -   uses: actions/checkout@v2
+
+            # Add a personal access token to the repository secrets. This will allow the splitter action to push the new commits
+            -   uses: frankdejonge/[email protected]
+                with:
+                    authentication: 'username:${{ secrets.PERSONAL_GITHUB_TOKEN }}'
+                    user_name: 'Committer name'
+                    user_email: 'Committer email'
+
+            # Cache the splitsh executable to speedup future runs
+            -   name: Cache splitsh-lite
+                uses: actions/cache@v2
+                with:
+                    path: './splitsh'
+                    key: '${{ runner.os }}-splitsh-v101'
+
+            # Retrieve the branch name of the branch that triggered the build.
+            -   name: Extract branch name
+                run: echo ::set-output name=branch_name::${GITHUB_REF#refs/*/}
+
+            # Sync commits and tags for the configured subtree splits
+            -   name: subtree split
+                uses: acrobat/subtree-splitter@v1
+                with:
+                    config-path: .github/subtree-splitter-config.json # Reference the location where you saved your config file
+                    source-branch: ${{ steps.vars.outputs.branch_name }} # The branch name is used when syncing commits, this is ignored when a tag is pushed/deleted
+```

action.yml

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+name: 'subtree-splitter'
+description: 'Sync your git repository subtree-splits'
+inputs:
+    config-path:
+        required: true
+        description: 'Configuration file path'
+    source-branch:
+        description: 'Branch to split from'
+        required: true
+runs:
+    using: 'node12'
+    main: 'dist/index.js'
+branding:
+    icon: shuffle
+    color: yellow

package.json

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+{
+  "name": "subtree-splitter",
+  "private": true,
+  "engines": {
+    "node": "12"
+  },
+  "author": "Jeroen Thora",
+  "license": "MIT",
+  "scripts": {
+    "compile": "ncc build src/index.ts --minify"
+  },
+  "dependencies": {
+    "@actions/core": "^1.4.0",
+    "@actions/exec": "^1.1.0",
+    "@actions/github": "^5.0.0",
+    "@octokit/webhooks-types": "^4.3.0"
+  },
+  "devDependencies": {
+    "@types/node": "^16.6.1",
+    "typescript": "^4.3.5"
+  }
+}

src/helpers/fs.ts

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+import * as fs from "fs";
+
+function dirExists(path: string): void {
+    try {
+        fs.mkdirSync(path);
+    } catch (err) {
+        if (err.code !== 'EEXIST') {
+            throw err;
+        }
+    }
+}
+
+function removeDir(path: string) {
+    try {
+        fs.rmdirSync(path, { recursive: true });
+    } catch (err) {
+        if (err.code !== 'ENOENT') {
+            throw err;
+        }
+    }
+}
+
+function removeFile(path: string) {
+    try {
+        fs.unlinkSync(path);
+    } catch (err) {
+        if (err.code !== 'ENOENT') {
+            throw err;
+        }
+    }
+}
+
+export { dirExists, removeDir, removeFile };