feat: emit YaziRenamedOrMoved event when files are renamed or moved

Problem
=======

When files are renamed or moved in yazi, there is no way for other
plugins to know about this. If the user uses yazi.nvim along with other
plugins that need to react to files being renamed or moved, it cannot be
done. This means that other plugins that depend on yazi cannot react to
these changes.

Currently yazi.nvim can only react to LSP delete/rename events, but
plugins that operate outside of the LSP protocol are not supported.

Solution
========

Add a new Neovim autocmd/event called `YaziRenamedOrMoved` that is
emitted when files are renamed or moved. This event will contain a table
of the paths that were renamed or moved.

Previously we were already emitting a Neovim event for `YaziDDSHover` -
now we have two custom events.

Closes #494

lua/yazi/event_handling/nvim_event_handling.lua

@@ -1,12 +1,34 @@
--- This file is about emitting events to other Neovim plugins
+-- This file is about emitting events to other Neovim plugins so that they can
+-- react to things that happen in this plugin.
 
 local M = {}
 
 ---@alias YaziNeovimEvent
 ---| "'YaziDDSHover'" A file was hovered over in yazi
+---| "'YaziRenamedOrMoved'" Files were renamed or moved
+
+---@alias YaziNeovimEvent.YaziRenamedOrMovedData {changes: table<string, string>} # a table of old paths to new paths
+
+---Emit and event when files are renamed or moved.
+---@param event YaziRenameEvent | YaziMoveEvent | YaziBulkEvent
+---@see YaziNeovimEvent.YaziRenamedOrMovedData
+function M.emit_renamed_or_moved_event(event)
+  ---@type YaziNeovimEvent.YaziRenamedOrMovedData
+  local event_data = {
+    changes = {},
+  }
+
+  if event.type == "move" or event.type == "rename" then
+    event_data.changes[event.data.from] = event.data.to
+  elseif event.type == "bulk" then
+    event_data.changes = event.changes
+  end
+
+  M.emit("YaziRenamedOrMoved", event_data)
+end
 
 ---@param event_name YaziNeovimEvent
----@param event_data table
+---@param event_data table<string, unknown>
 function M.emit(event_name, event_data)
   vim.api.nvim_exec_autocmds("User", {
     pattern = event_name,

lua/yazi/process/ya_process.lua

@@ -169,10 +169,23 @@ function YaProcess:process_events(events)
         event_handling.emit("YaziDDSHover", event)
       end)
     elseif event.type == "cd" then
-      ---@cast event YaziChangeDirectoryEvent
+      ---@cast event YaziHoverEvent
       self.cwd = event.url
     else
       self.events[#self.events + 1] = event
+
+      if
+        event.type == "rename"
+        or event.type == "move"
+        or event.type == "bulk"
+      then
+        local event_handling =
+          require("yazi.event_handling.nvim_event_handling")
+
+        pcall(function()
+          event_handling.emit_renamed_or_moved_event(event)
+        end)
+      end
     end
   end
 end

spec/yazi/ya_process_spec.lua

@@ -1,5 +1,6 @@
 local assert = require("luassert")
 local ya_process = require("yazi.process.ya_process")
+local spy = require("luassert.spy")
 
 describe("the get_yazi_command() function", function()
   it("specifies opening multiple tabs when enabled in the config", function()
@@ -113,4 +114,133 @@ describe("process_events()", function()
       assert.are.same("/tmp/directory", ya.cwd)
     end)
   end)
+
+  describe("YaziRenamedOrMoved events", function()
+    before_each(function()
+      -- delete the autocmd to prevent it from being called multiple times
+      vim.api.nvim_command("silent! autocmd! YaziRenamedOrMoved")
+    end)
+
+    it(
+      "gets published when YaziRenameEvent events are received from yazi",
+      function()
+        local config = require("yazi.config").default()
+        local ya = ya_process.new(config, "yazi_id_123")
+
+        ---@type YaziRenameEvent[]
+        local events = {
+          {
+            type = "rename",
+            timestamp = "2021-09-01T12:00:00Z",
+            id = "rename_123",
+            data = {
+              from = "/tmp/old_path",
+              to = "/tmp/new_path",
+            },
+          },
+        }
+
+        local event_callback = spy.new()
+        vim.api.nvim_create_autocmd("User", {
+          pattern = "YaziRenamedOrMoved",
+          callback = function(...)
+            event_callback(...)
+          end,
+        })
+
+        ya:process_events(events)
+
+        assert.spy(event_callback).was_called()
+        assert.same(#event_callback.calls, 1)
+
+        local event = event_callback.calls[1].vals[1]
+        assert.same({
+          changes = {
+            ["/tmp/old_path"] = "/tmp/new_path",
+          },
+        }, event.data)
+      end
+    )
+
+    it(
+      "gets published when YaziMoveEvent events are received from yazi",
+      function()
+        local config = require("yazi.config").default()
+        local ya = ya_process.new(config, "yazi_id_123")
+
+        ---@type YaziMoveEvent[]
+        local events = {
+          {
+            type = "move",
+            timestamp = "2021-09-01T12:00:00Z",
+            id = "rename_123",
+            data = {
+              from = "/tmp/old_path",
+              to = "/tmp/new_path",
+            },
+          },
+        }
+
+        local event_callback = spy.new()
+        vim.api.nvim_create_autocmd("User", {
+          pattern = "YaziRenamedOrMoved",
+          callback = function(...)
+            event_callback(...)
+          end,
+        })
+
+        ya:process_events(events)
+
+        assert.spy(event_callback).was_called()
+        assert.same(#event_callback.calls, 1)
+
+        local event = event_callback.calls[1].vals[1]
+        assert.same({
+          changes = {
+            ["/tmp/old_path"] = "/tmp/new_path",
+          },
+        }, event.data)
+      end
+    )
+
+    it(
+      "gets published when YaziBulkEvent events are received from yazi",
+      function()
+        local config = require("yazi.config").default()
+        local ya = ya_process.new(config, "yazi_id_123")
+
+        ---@type YaziBulkEvent[]
+        local events = {
+          {
+            type = "bulk",
+            changes = {
+              ["/tmp/old_path1"] = "/tmp/new_path1",
+              ["/tmp/old_path2"] = "/tmp/new_path2",
+            },
+          },
+        }
+
+        local event_callback = spy.new()
+        vim.api.nvim_create_autocmd("User", {
+          pattern = "YaziRenamedOrMoved",
+          callback = function(...)
+            event_callback(...)
+          end,
+        })
+
+        ya:process_events(events)
+
+        assert.spy(event_callback).was_called()
+        assert.same(#event_callback.calls, 1)
+
+        local event = event_callback.calls[1].vals[1]
+        assert.same({
+          changes = {
+            ["/tmp/old_path1"] = "/tmp/new_path1",
+            ["/tmp/old_path2"] = "/tmp/new_path2",
+          },
+        }, event.data)
+      end
+    )
+  end)
 end)