Joseph Price joprice

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Git Subtree Basics

If you hate git submodule, then you may want to give git subtree a try.

Background

When you want to use a subtree, you add the subtree to an existing repository where the subtree is a reference to another repository url and branch/tag. This add command adds all the code and files into the main repository locally; it's not just a reference to a remote repo.

When you stage and commit files for the main repo, it will add all of the remote files in the same operation. The subtree checkout will pull all the files in one pass, so there is no need to try and connect to another repo to get the portion of subtree files, because they were already included in the main repo.

Adding a subtree

Let's say you already have a git repository with at least one commit. You can add another repository into this respository like this:

	function debug() {
	var args = Array.prototype.slice.call(arguments).join(",")
	var script = ["console.log(", args, ")"].join('')
	chrome.devtools.inspectedWindow.eval(script);
	}

	import scala.language.experimental.macros
	import scala.reflect.macros.blackbox.Context
	import play.api.libs.json.{Format, Writes, Reads, OWrites}

	object PlayJson{

	def reads[A <: AnyRef]: Reads[A] = macro readsImpl[A]

	def readsImpl[A <: AnyRef : c.WeakTypeTag](c: Context): c.Expr[Reads[A]] = {
	import c.universe._


	/**
	Before:

	0: getstatic #19 // Field test/Eq$.MODULE$:Ltest/Eq$;
	3: iload_1
	4: invokestatic #25 // Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
	7: getstatic #30 // Field test/Eq$intEq$.MODULE$:Ltest/Eq$intEq$;
	10: invokevirtual #34 // Method test/Eq$.EqOps:(Ljava/lang/Object;Ltest/Eq;)Ltest/Eq$EqOps;
	13: iload_2

	// allows converting one class to another by providing missing fields
	object convert {

	@annotation.implicitNotFound("""
	You have not provided enough arguments to convert from ${In} to ${Out}.
	${Args}
	""")
	trait Convertible[Args, In, Out] {
	def apply(args: Args, in: In): Out
	}


	trait AnimalMouth
	class Beak extends AnimalMouth

	object Test1 {

	//================================Generic type works as in the following =======================

	trait Animal[Mouth <: AnimalMouth] {
	def mouth : Mouth


	tsql {
	driver = "slick.driver.MySQLDriver$"

	db {
	driver = "com.mysql.jdbc.Driver"
	url = "jdbc:mysql://localhost:3306/test"
	user = "root"
	password = "pass"
	}

	@annotation.tailrec
	def findFileInParents(name: String, dir: File = file(".")): Option[File] = {
	lazy val parent = Option(dir.getAbsoluteFile.getParentFile)
	val f = dir / name
	if (!f.exists) {
	println(s"no $f. checking parent")
	if (parent.isDefined) findFile(name, parent.get)
	else None
	} else Some(f)
	}



	def path[A, B <: AnyRef](name: String, value: A, parent: B): FieldType[(name.type, parent.type), A] =
	field[(name.type, parent.type)].apply[A](value)

	def emptyPath[A](value: A): FieldType[Nothing, A] = field[Nothing](value)

	trait Path[A] {
	type Out <: HList
	val value: Out