From c0314212a0d951494fe6397fa53a9c5689a3ff87 Mon Sep 17 00:00:00 2001
From: fiaxh <git@mx.ax.lt>
Date: Fri, 24 Mar 2017 00:15:00 +0100
Subject: Tab completion for MUC occupants

---
 .../src/ui/chat_input/occupants_tab_completer.vala | 116 +++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 main/src/ui/chat_input/occupants_tab_completer.vala

(limited to 'main/src/ui/chat_input/occupants_tab_completer.vala')

diff --git a/main/src/ui/chat_input/occupants_tab_completer.vala b/main/src/ui/chat_input/occupants_tab_completer.vala
new file mode 100644
index 00000000..93b0e7ff
--- /dev/null
+++ b/main/src/ui/chat_input/occupants_tab_completer.vala
@@ -0,0 +1,116 @@
+using Gdk;
+using Gee;
+using Gtk;
+
+using Dino.Entities;
+
+namespace Dino.Ui.ChatInput {
+
+/**
+ * - With given prefix: Complete from occupant list (sorted lexicographically)
+ * - W/o prefix: Complete from received messages (most recent first)
+ * - At the start (with ",") and in the middle of a text
+ * - Backwards tabbing
+ */
+class OccupantsTabCompletor {
+
+    private StreamInteractor stream_interactor;
+    private Conversation? conversation;
+    private TextView text_input;
+
+    private Gee.List<string> completions = new ArrayList<string>();
+    private bool active = false;
+    private int index = -1;
+
+    public OccupantsTabCompletor(StreamInteractor stream_interactor, TextView text_input) {
+        this.stream_interactor = stream_interactor;
+        this.text_input = text_input;
+
+        text_input.key_press_event.connect(on_text_input_key_press);
+    }
+
+    public void initialize_for_conversation(Conversation conversation) {
+        this.conversation = conversation;
+    }
+
+    public bool on_text_input_key_press(EventKey event) {
+        if (conversation.type_ == Conversation.Type.GROUPCHAT) {
+            if (event.keyval == Key.Tab || event.keyval == Key.ISO_Left_Tab) {
+                string text = text_input.buffer.text;
+                int start_index = int.max(text.last_index_of(" "), text.last_index_of("\n")) + 1;
+                string word = text.substring(start_index);
+                if (!active) {
+                    if (word == "") {
+                        completions = generate_completions_from_messages();
+                    } else {
+                        completions = generate_completions_from_occupants(word);
+                    }
+                    if (completions.size > 0) {
+                        active = true;
+                        index = -1;
+                    }
+                }
+                if (event.keyval != Key.ISO_Group_Shift && active) {
+                    text_input.buffer.text = next_completion(event.keyval == Key.ISO_Left_Tab);
+                    return true;
+                }
+            } else if (event.keyval != Key.Shift_L && active) {
+                active = false;
+            }
+        }
+        return false;
+    }
+
+    private string next_completion(bool backwards) {
+        string text = text_input.buffer.text;
+        int start_index = int.max(text.last_index_of(" "), text.last_index_of("\n")) + 1;
+        string prev_completion = text.substring(start_index);
+        if (index > -1) {
+            start_index = int.max(
+                text.substring(0, text.length - 1).last_index_of(" "),
+                text.substring(0, text.length - 1).last_index_of("\n")
+            ) + 1;
+            prev_completion = text.substring(start_index);
+        }
+        if (backwards) {
+            index = int.max(index, 0) - 1;
+            if (index < 0) index = completions.size - 1;
+        } else {
+            index = (index + 1) % (completions.size);
+        }
+        if (start_index == 0) {
+            return completions[index] + ", ";
+        } else {
+            return text.substring(0, text.length - prev_completion.length) + completions[index] + " ";
+        }
+    }
+
+    private Gee.List<string> generate_completions_from_messages() {
+        Gee.List<string> ret = new ArrayList<string>();
+        Gee.List<Message>? messages = stream_interactor.get_module(MessageManager.IDENTITY).get_messages(conversation, 10);
+        if (messages != null) {
+            for (int i = messages.size - 1; i > 0; i--) {
+                string resourcepart = messages[i].from.resourcepart;
+                string own_nick = stream_interactor.get_module(MucManager.IDENTITY).get_nick(conversation.counterpart, conversation.account);
+                if (resourcepart != null && resourcepart != "" && resourcepart != own_nick && !ret.contains(resourcepart)) {
+                    ret.add(resourcepart);
+                }
+            }
+        }
+        return ret;
+    }
+
+    private Gee.List<string> generate_completions_from_occupants(string prefix) {
+        Gee.List<string> ret = new ArrayList<string>();
+        Gee.List<Jid>? occupants = stream_interactor.get_module(MucManager.IDENTITY).get_other_occupants(conversation.counterpart, conversation.account);
+        if (occupants != null) {
+            foreach (Jid jid in occupants) {
+                if (jid.resourcepart.to_string().has_prefix(prefix)) ret.add(jid.resourcepart.to_string());
+            }
+        }
+        ret.sort();
+        return ret;
+    }
+}
+
+}
\ No newline at end of file
-- 
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