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class DependencyGroup {
  // provides the `.``[]` operators
  operator fun get(key: String): DependencyItem

  // provides the `<key>(<notation>)` syntax
  operator fun String.invoke(notation: String)

  // provides the `<key> {<group>}` syntax
  operator fun String.invoke(init: DependencyGroup.() -> Unit)
}

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interface DependencyItem

data class DependencyNotation(val notation: String) : DependencyItem

class DependencyGroup : DependencyItem {
  val dependencies: Map<String, DependencyItem>
}

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// Declarations
ext["deps"] = mapOf(
  "support" to mapOf(
    "appCompat" to "com.android.support:appcompat-v7:26.0.2",
    "design" to "com.android.support:design:26.0.2"
  ),
  "picasso" to "com.squareup.picasso:picasso:2.5.2"
)

// References

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// global definition in root project
ext.versions = [
  compileSdk: 26,
  targetSdk: 25,
  …
]
ext.deps = [
  support: [
    appCompat: “com.android.support:appcompat-v7:${versions.supportLibrary}”,
    design: “com.android.support:design:${versions.supportLibrary}”,

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dependencies {
  compile(deps["support.appCompat"])
  compile(deps["support"]["design"])
  compile(deps["picasso"])
}

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extra.deps {
  "support" {
    "appCompat"("com.android.support:appcompat-v7:26.0.2")
    "design"("com.android.support:design:26.0.2")
  }
  "picasso"("com.squareup.picasso:picasso:2.5.2")
}

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This's for the article Defining Dependencies in Gradle Kotlin DSL.

If you're using [kotlin-dsl] in a multi-project manner, you may want to define all the dependencies in one place. You can put the files into buildSrc, define dependencies in a compat way like this:

extra.deps {
    "kt"("stdlib-jre7")
    "auto" {
        "common"("com.google.auto:auto-common:0.8")
        "service"("com.google.auto.service:auto-service:1.0-rc3")

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cd /tmp
pwd
#Download Android SDK from Google and unzip it
wget http://dl.google.com/android/android-sdk_r24.1.2-linux.tgz
tar zxvf android-sdk_r24.1.2-linux.tgz
rm android-sdk_r24.1.2-linux.tgz
#Set extracted SDK location to $PATH so we can use commands
export ANDROID_HOME="/tmp/android-sdk-linux"
export PATH="$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$PATH"

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// parameters of the function
var repo = request.params.repo;  // 'user_or_org/repo_name'
var slackWebhook = request.params.slackWebhook;  // e.g. 'https://hooks.slack.com/services/XXX'

var repoUrl = 'https://api.github.com/repos/' + repo;

// Set the following names to match your own scheme
var className = 'RepoStars';  // LeanCloud class for storing repo stars
var fieldRepo = 'repo';  // LeanCloud field to store the repo name
var fieldStars = 'count';  // LeanCloud field to store the count of stars

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apply plugin: 'com.android.library'

ext {
    generatedSourcesDir = file 'gen/main/java'
}

android {
    compileSdkVersion XX
    buildToolsVersion "XX"