Auto-publish & substitute local Glean package

Careful with this: If anything inside Glean Core changes this will still
require a local substitute for the Gecko build.

app/build.gradle

@@ -804,6 +804,11 @@ if (gradle.hasProperty('localProperties.autoPublish.application-services.dir'))
     apply from: "../${appServicesSrcDir}/build-scripts/substitute-local-appservices.gradle"
 }
 
+if (gradle.hasProperty('localProperties.autoPublish.glean.dir')) {
+    ext.gleanSrcDir = gradle."localProperties.autoPublish.glean.dir"
+    apply from: "../${gleanSrcDir}/build-scripts/substitute-local-glean.gradle"
+}
+
 // Define a reusable task for updating the versions of our built-in web extensions. We automate this
 // to make sure we never forget to update the version, either in local development or for releases.
 // In both cases, we want to make sure the latest version of all extensions (including their latest

settings.gradle

@@ -27,6 +27,7 @@ def runCmd(cmd, workingDir, successMessage, captureStdout=true) {
 Properties localProperties = null
 String settingAppServicesPath = "autoPublish.application-services.dir"
 String settingAndroidComponentsPath = "autoPublish.android-components.dir"
+String settingGleanPath = "autoPublish.glean.dir"
 
 if (file('local.properties').canRead()) {
     localProperties = new Properties()
@@ -71,4 +72,19 @@ if (localProperties != null) {
     } else {
         log("Disabled auto-publication of android-components. Enable it by settings '$settingAndroidComponentsPath' in local.properties")
     }
+
+    String gleanLocalPath = localProperties.getProperty(settingGleanPath)
+
+    if (gleanLocalPath != null) {
+        log("Enabling automatic publication of Glean from: $gleanLocalPath")
+        // As above, hacks to execute .py files on Windows.
+        def publishGleanCmd = [];
+        if (System.properties['os.name'].toLowerCase().contains('windows')) {
+            publishGleanCmd << "py";
+        }
+        publishGleanCmd << "./build-scripts/publish_to_maven_local_if_modified.py";
+        runCmd(publishGleanCmd, gleanLocalPath, "Published Glean for local development.", false)
+    } else {
+        log("Disabled auto-publication of Glean. Enable it by settings '$settingGleanPath' in local.properties")
+    }
 }