First idea of something

.gitignore

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+build/

Makefile

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+.PHONY: build/git-workflow
+
+build/git-workflow:
+	amber main.ab $@

cmd/feature.ab

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+fun feature_start(feature: Text, description: Text): Null {
+    echo "Create feature {feature} ({description})"
+}
+
+fun feature_checkout(feature: Text): Null {
+    echo "Checkout feature {feature}"
+}
+
+fun feature_publish(feature: Text): Null {
+    echo "Publish feature {feature}"
+}
+
+fun feature_finish(feature: Text): Null {
+    echo "Finish feature {feature}"
+}
+
+fun feature_delete(feature: Text): Null {
+    echo "Delete feature {feature}"
+}
+
+fun feature_rebase(feature: Text): Null {
+    echo "Rebase feature {feature}"
+}
+
+fun help(args: [Text]): Null {
+    echo "Feature help"
+}
+
+pub fun feature_cmd(args: [Text]): Null {
+    let cmd = args[1]
+    let feature = args[2]
+
+    if {
+        cmd == "": help(args)
+        cmd == "start": feature_start(feature, args[3])
+        cmd == "checkout": feature_checkout(feature)
+        cmd == "publish": feature_publish(feature)
+        cmd == "finish": feature_finish(feature)
+        cmd == "rebase": feature_rebase(feature)
+        cmd == "delete": feature_delete(feature)
+        else: echo "Unknown command feature '{cmd}'"
+    }
+}
+

main.ab

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+import { feature_cmd } from "./cmd/feature.ab"
+
+fun help(args: [Text]): Null {
+    echo "help"
+}
+
+main(args) {
+    let cmd = args[0]
+
+    if {
+        cmd == "" { help(args) }
+        cmd == "feature" { feature_cmd(args) }
+        else {
+            echo "unknown command '{cmd}'"
+            fail 1
+        }
+    }
+}