Added GetGroupIDBYName and AddGroupMembers options (#23)

* Added GetGroupIDBYName and AddGroupMembers options

* Modified README.md for new commands

* Removed GetGroupIDByName. Corrections AddGroupMembers and README

* Corrections for print and error messages in AddGroupMembers

* Corrections to AddGroupMembers

src/main/groovy/org/craftercms/cli/Main.groovy

@@ -17,6 +17,7 @@
 package org.craftercms.cli
 
 import org.craftercms.cli.commands.AddEnvironment
+import org.craftercms.cli.commands.group.AddGroupMembers
 import org.craftercms.cli.commands.group.CreateGroup
 import org.craftercms.cli.commands.group.ListGroups
 import org.craftercms.cli.commands.marketplace.CopyPlugin
@@ -30,7 +31,7 @@ import picocli.CommandLine
         name = 'crafter-cli', usageHelpAutoWidth = true,
         versionProvider = VersionProvider.class, mixinStandardHelpOptions = true,
         subcommands = [CommandLine.HelpCommand, AddEnvironment, AddRemote, CreateSite, ListRemotes, SyncFrom, SyncTo,
-                ListSites, CopyPlugin, CreateUser, ListUsers, CreateAccessToken, PublishContent, CreateGroup, ListGroups])
+                ListSites, CopyPlugin, CreateUser, ListUsers, CreateAccessToken, PublishContent, CreateGroup, ListGroups, AddGroupMembers])
 class Main {
 
     static def main(args) {

src/main/groovy/org/craftercms/cli/commands/group/AddGroupMembers.groovy

@@ -0,0 +1,81 @@
+package org.craftercms.cli.commands.group
+
+import org.craftercms.cli.commands.AbstractCommand
+import picocli.CommandLine
+
+@CommandLine.Command(name = 'add-group-members', description = 'Adds one or more users to a group')
+class AddGroupMembers extends AbstractCommand {
+
+    @CommandLine.Spec
+    CommandLine.Model.CommandSpec commandSpec
+
+    @CommandLine.Option(names = ['-gn', '--group-name'], required = true, description = 'Group name. Required if not bulk importing from a file.')
+    String groupName
+
+    @CommandLine.Option(names = ['-u', '--users'], split = ',', required = true, description = 'Comma separated list of users to add')
+    String[] users
+
+    def validateParameters() {
+        if (!groupName) {
+            throw new CommandLine.ParameterException(commandSpec.commandLine(), 'Missing required option group-name')
+        }
+
+        if (!users) {
+            throw new CommandLine.ParameterException(commandSpec.commandLine(), 'Missing required option users')
+        }
+    }
+
+    @Override
+    def run(client) {
+        validateParameters()
+        addMembers(client, groupName, users)
+    }
+
+    /**
+     * Add one or more users to a group
+     * @param client HTTPClient object
+     * @param groupName group name
+     * @param users list of users to add
+     */
+    static def addMembers(client, groupName, users) {
+        def response = getGroupIdByName(client, groupName)
+
+        if (!response || !response.group) {
+            println "Error retrieving group '${groupName}'"
+            return
+        }
+
+        def groupId = response.group.id
+        def path = "/studio/api/2/groups/${groupId}/members"
+        def body = [usernames: users]
+
+        def result = client.post(path, body)
+        if (!result) {
+            println "Failed to add members '${users}' to group '${groupName}'"
+            return
+        }
+
+        println "Members '${users}' added to group '${groupName}' succesfully"
+    }
+
+    /**
+     * Get a group by name
+     * @param client HTTPClient object
+     * @param groupName group name
+     */
+    static def getGroupIdByName(client, groupName) {
+        def path = "/studio/api/2/groups/by_name/${groupName}"
+        def result = client.get(path)
+        if (!result) {
+            println "Failed to retrieve group '${groupName}'"
+            return
+        }
+
+        if (!result.group) {
+            println "Failed to retrieve group '${groupName}', error '${result.message}'"
+            return
+        }
+
+        return result
+    }
+}