Add ls-users command

Change-Id: Ifbf0fdb0295037351336abc80d5d0291255e8b24
diff --git a/src/main/java/com/googlesource/gerrit/plugins/adminconsole/AdminConsoleCommandModule.java b/src/main/java/com/googlesource/gerrit/plugins/adminconsole/AdminConsoleCommandModule.java
index 62ccdd0..fece7cb 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/adminconsole/AdminConsoleCommandModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/adminconsole/AdminConsoleCommandModule.java
@@ -20,6 +20,7 @@
   @Override
   protected void configureCommands() {
     command(ShowAccountCommand.class);
+    command(ListUsersCommand.class);
    alias("show-account", ShowAccountCommand.class);
    alias("show-repo-account-access", ShowRepoAccountAccessCommand.class);
    alias("show-repo-access", ShowRepoAccessCommand.class);
diff --git a/src/main/java/com/googlesource/gerrit/plugins/adminconsole/ListUsersCommand.java b/src/main/java/com/googlesource/gerrit/plugins/adminconsole/ListUsersCommand.java
new file mode 100644
index 0000000..54a0bfc
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/adminconsole/ListUsersCommand.java
@@ -0,0 +1,56 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.adminconsole;
+
+import com.google.common.base.Strings;
+import com.google.gerrit.common.data.GlobalCapability;
+import com.google.gerrit.extensions.annotations.CapabilityScope;
+import com.google.gerrit.extensions.annotations.RequiresCapability;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.sshd.CommandMetaData;
+import com.google.gerrit.sshd.SshCommand;
+import com.google.gwtorm.server.ResultSet;
+import com.google.inject.Inject;
+
+@RequiresCapability(value=GlobalCapability.ADMINISTRATE_SERVER, scope=CapabilityScope.CORE)
+@CommandMetaData(name = "ls-users", description = "List users")
+public final class ListUsersCommand extends SshCommand {
+  private ReviewDb db;
+
+  @Inject
+  ListUsersCommand(ReviewDb db) {
+    this.db = db;
+  }
+
+  @Override
+  protected void run() throws UnloggedFailure, Failure, Exception {
+    ResultSet<Account> accounts = db.accounts().iterateAllEntities();
+    for (Account account : accounts) {
+      String out = new StringBuilder()
+        .append(account.getId().toString())
+        .append(" |")
+        .append(Strings.isNullOrEmpty(account.getFullName())
+            ? ""
+            : " " + account.getFullName())
+        .append(" |")
+        .append(Strings.isNullOrEmpty(account.getPreferredEmail())
+            ? ""
+            : " " + account.getPreferredEmail())
+        .toString();
+      stdout.println(out);
+    }
+  }
+}
diff --git a/src/main/resources/Documentation/cmd-ls-users.md b/src/main/resources/Documentation/cmd-ls-users.md
new file mode 100644
index 0000000..a3ead52
--- /dev/null
+++ b/src/main/resources/Documentation/cmd-ls-users.md
@@ -0,0 +1,30 @@
+@PLUGIN@ ls-users
+=================
+
+NAME
+----
+@PLUGIN@ ls-users list user accounts
+
+SYNOPSIS
+--------
+>     ssh -p <port> <host> @PLUGIN@ ls-users
+
+DESCRIPTION
+-----------
+Lists all user accounts registered on the site.
+
+OPTIONS
+-------
+
+--help
+
+-h
+> Display usage information.
+
+ACCESS
+------
+Gerrit Administrators only.
+
+SCRIPTING
+---------
+This command is not intended to be used in scripts.