From 32444fda734e921c1c6c15891799a39205b587b5 Mon Sep 17 00:00:00 2001
From: luk3yx <luk3yx@users.noreply.github.com>
Date: Sun, 30 Dec 2018 17:13:39 +1300
Subject: [PATCH] Add chat channels integration

---
 README.md | 15 +++++++++++++--
 init.lua  | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 3cd92c3..8eae77b 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,24 @@ create HUDs on their own.
 
 ## How to use
 
-advmarkers introduces four chatcommands:
+`advmarkers` introduces the following chatcommands:
 
  - `.mrkr`: Opens a formspec allowing you to display or delete markers.
- - `.add_mrkr`: Adds markers. You can either use `.add_mrkr x,y,z Marker name` or `.add_mrkr here Marker name` to add markers. Markers are (currently) cross-server, and adding a marker with (exactly) the same name as another will overwrite the original marker.
+ - `.add_mrkr`: Adds markers. You can use `.add_mrkr x,y,z Marker name` to add markers. Markers are (currently) cross-server, and adding a marker with (exactly) the same name as another will overwrite the original marker. If you replace `x,y,z` with `here`, the marker will be set to your current position, and replacing it with `there` will set the marker to the last `.coords` position.
  - `.mrkr_export`: Exports your markers to an advmarkers string. Remember to not modify the text before copying it.
  - `.mrkr_import`: Imports your markers from an advmarkers string (`.mrkr_import <advmarkers string>`). Any markers with the same name will not be overwritten, and if they do not have the same co-ordinates, `_` will be appended to the imported one.
+ - `.mrkrthere`: Sets a marker at the last `.coords` position.
 
 If you die, a marker is automatically added at your death position.
 
+## Chat channels integration
+
+advmarkers works with the `.coords` command from chat_channels ([GitHub],
+[GitLab]), even without chat channels installed. When someone does `.coords`,
+advmarkers temporarily stores this position, and you can set a temporary marker
+at the `.coords` position with `.mrkrthere`, or add a permanent marker with
+`.add_mrkr there Marker name`.
+
 [marker]: https://github.com/Billy-S/kingdoms_game/blob/master/mods/marker
+[GitHub]: https://github.com/luk3yx/minetest-chat_channels
+[GitLab]: https://gitlab.com/luk3yx/minetest-chat_channels
diff --git a/init.lua b/init.lua
index a5bfebe..689f62b 100644
--- a/init.lua
+++ b/init.lua
@@ -176,6 +176,11 @@ minetest.register_chatcommand('add_mrkr', {
         -- Validate the position
         if pos == 'here' then
             pos = minetest.localplayer:get_pos()
+        elseif pos == 'there' then
+            if not advmarkers.last_coords then
+                return false, 'No-one has used .coords yet!'
+            end
+            pos = advmarkers.last_coords
         else
             pos = string_to_pos(pos)
             if not pos then
@@ -269,3 +274,33 @@ minetest.register_chatcommand('mrkr_import', {
         end
     end
 })
+
+-- Chat channels .coords integration.
+-- You do not need to have chat channels installed for this to work.
+if not minetest.registered_on_receiving_chat_message then
+    minetest.registered_on_receiving_chat_message =
+        minetest.registered_on_receiving_chat_messages
+end
+
+table.insert(minetest.registered_on_receiving_chat_message, 1, function(msg)
+    local s, e = msg:find('Current Position: %-?[0-9]+, %-?[0-9]+, %-?[0-9]+%.')
+    if s and e then
+        local pos = string_to_pos(msg:sub(s + 18, e - 1))
+        if pos then
+            advmarkers.last_coords = pos
+        end
+    end
+end)
+
+-- Add '.mrkrthere'
+minetest.register_chatcommand('mrkrthere', {
+    params      = '',
+    description = 'Adds a (temporary) marker at the last ".coords" position.',
+    func = function(param)
+        if not advmarkers.last_coords then
+            return false, 'No-one has used ".coords" yet!'
+        elseif not advmarkers.set_hud_pos(advmarkers.last_coords) then
+            return false, 'Error setting the marker!'
+        end
+    end
+})