1 files changed, 53 insertions, 0 deletions
diff --git a/model/pipeline/builder.ts b/model/pipeline/builder.ts
new file mode 100644
index 0000000..e95e89c
--- /dev/null
+++ b/model/pipeline/builder.ts
@@ -0,0 +1,53 @@
+import { Pipeline, PipelineStage } from '.';
+import { FetchCodeJob } from '../job';
+import { PipelineImpl } from './impl';
+
+export interface PipelineBuilder {
+    addStage(stage: PipelineStage): PipelineBuilder;
+    build(): Pipeline;
+}
+
+export abstract class BasePipelineBuilder implements PipelineBuilder {
+    protected readonly stages: Array<PipelineStage> = [];
+
+    public addStage(stage: PipelineStage): PipelineBuilder {
+        this.stages.push(stage);
+        return this;
+    }
+
+    public build() {
+        return new PipelineImpl(this.stages);
+    }
+}
+
+export class DefaultGitHookPipelineBuilder extends BasePipelineBuilder {
+    constructor(
+        private readonly remoteUrl = process.env.remote!,
+        rev = process.env.rev!,
+        private readonly ref = process.env.ref!,
+    ) {
+        super();
+
+        this.addStage({
+            parallelJobs: [
+                <FetchCodeJob>{
+                    type: 'fetch_code.ts',
+                    arguments: {
+                        remoteUrl,
+                        checkout: rev,
+                        path: this.getSourceDestination(),
+                    },
+                },
+            ],
+        });
+    }
+
+    public getSourceDestination() {
+        return this.remoteUrl.split('/').at(-1) ?? 'src';
+    }
+
+    public getBranch(): string | undefined {
+        const branchRefPrefix = 'refs/heads/';
+        return this.ref.split(branchRefPrefix).at(1);
+    }
+}