Set command list completion restrained to the line start offset

app/src/main/java/chat/rocket/android/chatroom/adapter/CommandSuggestionsAdapter.kt

@@ -11,7 +11,8 @@ import chat.rocket.android.widget.autocompletion.model.SuggestionModel
 import chat.rocket.android.widget.autocompletion.ui.BaseSuggestionViewHolder
 import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter
 
-class CommandSuggestionsAdapter : SuggestionsAdapter<CommandSuggestionsViewHolder>("/", UNLIMITED_RESULT_COUNT) {
+class CommandSuggestionsAdapter : SuggestionsAdapter<CommandSuggestionsViewHolder>(token = "/",
+        constraint = CONSTRAINT_BOUND_TO_START, threshold = UNLIMITED_RESULT_COUNT) {
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CommandSuggestionsViewHolder {
         val view = LayoutInflater.from(parent.context).inflate(R.layout.suggestion_command_item, parent,

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomPresenter.kt

@@ -6,10 +6,10 @@ import chat.rocket.android.chatroom.adapter.AutoCompleteType
 import chat.rocket.android.chatroom.adapter.PEOPLE
 import chat.rocket.android.chatroom.adapter.ROOMS
 import chat.rocket.android.chatroom.domain.UriInteractor
-import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
-import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.chatroom.viewmodel.ViewModelMapper
+import chat.rocket.android.chatroom.viewmodel.suggestion.ChatRoomSuggestionViewModel
 import chat.rocket.android.chatroom.viewmodel.suggestion.CommandSuggestionViewModel
+import chat.rocket.android.chatroom.viewmodel.suggestion.PeopleSuggestionViewModel
 import chat.rocket.android.core.lifecycle.CancelStrategy
 import chat.rocket.android.helper.UrlHelper
 import chat.rocket.android.infrastructure.LocalRepository
@@ -489,16 +489,12 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
         view.showReactionsPopup(messageId)
     }
 
-    /**
-     * Loads the list of available commands.
-     */
-    fun loadCommands(query: String = "") {
+    fun loadCommands() {
         launchUI(strategy) {
             try {
                 //TODO: cache the commands
                 val commands = client.commands(0, 100).result
                 view.populateCommandSuggestions(commands.map {
-                    println(it)
                     CommandSuggestionViewModel(it.command, it.description ?: "", listOf(it.command))
                 })
             } catch (ex: RocketChatException) {

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -494,10 +494,10 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
     }
 
     private fun setupSuggestionsView() {
-        suggestions_view.anchor(text_message)
-                .registerTokenAdapter(PeopleSuggestionsAdapter())
-                .registerTokenAdapter(CommandSuggestionsAdapter())
-                .registerTokenAdapter(RoomSuggestionsAdapter())
+        suggestions_view.anchorTo(text_message)
+                .addTokenAdapter(PeopleSuggestionsAdapter())
+                .addTokenAdapter(CommandSuggestionsAdapter())
+                .addTokenAdapter(RoomSuggestionsAdapter())
                 .addSuggestionProviderAction("@") { query ->
                     if (query.isNotEmpty()) {
                         presenter.spotlight(query, PEOPLE, true)
@@ -508,8 +508,8 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
                         presenter.loadChatRooms()
                     }
                 }
-                .addSuggestionProviderAction("/") { query ->
-                    presenter.loadCommands(query)
+                .addSuggestionProviderAction("/") { _ ->
+                    presenter.loadCommands()
                 }
 
         presenter.loadCommands()

app/src/main/java/chat/rocket/android/widget/autocompletion/ui/SuggestionsAdapter.kt

@@ -7,9 +7,18 @@ import chat.rocket.android.widget.autocompletion.strategy.regex.StringMatchingCo
 import java.lang.reflect.Type
 import kotlin.properties.Delegates
 
-abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(val token: String, threshold: Int  = MAX_RESULT_COUNT) : RecyclerView.Adapter<VH>() {
+abstract class SuggestionsAdapter<VH : BaseSuggestionViewHolder>(
+        val token: String,
+        val constraint: Int = CONSTRAINT_UNBOUND,
+        threshold: Int  = MAX_RESULT_COUNT) : RecyclerView.Adapter<VH>() {
     companion object {
+        // Any number of results.
         const val UNLIMITED_RESULT_COUNT = -1
+        // Trigger suggestions only if on the line start.
+        const val CONSTRAINT_BOUND_TO_START = 0
+        // Trigger suggestions from anywhere.
+        const val CONSTRAINT_UNBOUND = 1
+        // Maximum number of results to display by default.
         private const val MAX_RESULT_COUNT = 5
     }
     private var itemType: Type? = null

app/src/main/java/chat/rocket/android/widget/autocompletion/ui/SuggestionsView.kt

@@ -21,6 +21,7 @@ import android.widget.EditText
 import android.widget.FrameLayout
 import chat.rocket.android.R
 import chat.rocket.android.widget.autocompletion.model.SuggestionModel
+import chat.rocket.android.widget.autocompletion.ui.SuggestionsAdapter.Companion.CONSTRAINT_BOUND_TO_START
 import java.lang.ref.WeakReference
 import java.util.concurrent.CopyOnWriteArrayList
 import java.util.concurrent.atomic.AtomicInteger
@@ -77,6 +78,10 @@ class SuggestionsView : FrameLayout, TextWatcher {
 
         val new = s.subSequence(start, start + count).toString()
         if (adaptersByToken.containsKey(new)) {
+            val constraint = adapter(new).constraint
+            if (constraint == CONSTRAINT_BOUND_TO_START && start != 0) {
+                return
+            }
             swapAdapter(getAdapterForToken(new)!!)
             completionStartIndex.compareAndSet(NO_STATE_INDEX, start + 1)
             editor?.let {
@@ -125,14 +130,14 @@ class SuggestionsView : FrameLayout, TextWatcher {
 
     private fun getAdapterForToken(token: String): SuggestionsAdapter<*>? = adaptersByToken.get(token)
 
-    fun anchor(editText: EditText): SuggestionsView {
+    fun anchorTo(editText: EditText): SuggestionsView {
         editText.removeTextChangedListener(this)
         editText.addTextChangedListener(this)
         editor = WeakReference(editText)
         return this
     }
 
-    fun registerTokenAdapter(adapter: SuggestionsAdapter<*>): SuggestionsView {
+    fun addTokenAdapter(adapter: SuggestionsAdapter<*>): SuggestionsView {
         adaptersByToken.getOrPut(adapter.token, { adapter })
         return this
     }