Create binstubs for executables when activating a package.

sdk/lib/_internal/pub/lib/src/command/global_activate.dart

Index: sdk/lib/_internal/pub/lib/src/command/global_activate.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/global_activate.dart b/sdk/lib/_internal/pub/lib/src/command/global_activate.dart
index 8448af58e84ce72f61a0b730b6d3784ae7f1e9c1..5f451f9150a776de8ede1b9e2465fd1ee57787a3 100644
--- a/sdk/lib/_internal/pub/lib/src/command/global_activate.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/global_activate.dart
@@ -22,9 +22,33 @@ class GlobalActivateCommand extends PubCommand {
         help: "The source used to find the package.",
         allowed: ["git", "hosted", "path"],
         defaultsTo: "hosted");
+
+    commandParser.addFlag("no-executables", negatable: false,
+        help: "Do not put executables on PATH.");
+
+    commandParser.addOption("executable", abbr: "x",
+        help: "Executable(s) to place on PATH.",
+        allowMultiple: true);
+
+    commandParser.addFlag("overwrite-executables", negatable: false,
+        help: "Overwrite executables from other packages with the same name.");
   }
 
   Future onRun() {
+    // Default to `null`, which means all executables.
+    var executables;
+    if (commandOptions.wasParsed("executable")) {
+      if (commandOptions.wasParsed("no-executables")) {
+        usageError("Cannot pass both --no-executables and --executable.");
+      }
+
+      executables = commandOptions["executable"];
+    } else if (commandOptions["no-executables"]) {
+      // An empty list means no executables.
+      executables = [];
+    }
+
+    var overwrite = commandOptions["overwrite-executables"];
     var args = commandOptions.rest;
 
     readArg([String error]) {
@@ -46,7 +70,8 @@ class GlobalActivateCommand extends PubCommand {
         var repo = readArg("No Git repository given.");
         // TODO(rnystrom): Allow passing in a Git ref too.
         validateNoExtraArgs();
-        return globals.activateGit(repo);
+        return globals.activateGit(repo, executables,
+            overwriteBinStubs: overwrite);
 
       case "hosted":
         var package = readArg("No package to activate given.");
@@ -62,12 +87,14 @@ class GlobalActivateCommand extends PubCommand {
         }
 
         validateNoExtraArgs();
-        return globals.activateHosted(package, constraint);
+        return globals.activateHosted(package, constraint, executables,
+            overwriteBinStubs: overwrite);
 
       case "path":
         var path = readArg("No package to activate given.");
         validateNoExtraArgs();
-        return globals.activatePath(path);
+        return globals.activatePath(path, executables,
+            overwriteBinStubs: overwrite);
     }
 
     throw "unreachable";