feat(autocmds): retrieve lua callback (#18642)

add a new `callback` field to `nvim_get_autocmds`

1 files changed, 51 insertions, 3 deletions

diff --git a/test/functional/api/autocmd_spec.lua b/test/functional/api/autocmd_spec.lua
index 491dac9f35..5dfcd09438 100644
--- a/test/functional/api/autocmd_spec.lua
+++ b/test/functional/api/autocmd_spec.lua
@@ -135,17 +135,22 @@ describe('autocmd api', function()
         local desc = 'Can show description'
         meths.set_var('desc', desc)
 
-        exec_lua([[
+        local result = exec_lua([[
           local callback = function() print 'Should Not Have Errored' end
           vim.api.nvim_create_autocmd("BufReadPost", {
             pattern = "*.py",
             callback = callback,
             desc = vim.g.desc,
           })
+          local aus = vim.api.nvim_get_autocmds({ event = 'BufReadPost' })
+          local first = aus[1]
+          return {
+            desc = first.desc,
+            cbtype = type(first.callback)
+          }
         ]])
 
-        eq(desc, meths.get_autocmds({ event = 'BufReadPost' })[1].desc)
-        matches('<lua: %d+>', meths.get_autocmds({ event = 'BufReadPost' })[1].command)
+        eq({ desc = desc, cbtype = 'function' }, result)
       end)
 
       it('will not add a description unless it was provided', function()
@@ -465,6 +470,49 @@ describe('autocmd api', function()
         -- 3-7 for the 5 we make in the autocmd
         eq({1, 2, 3, 4, 5, 6, 7}, bufs)
       end)
+
+      it('can retrieve a callback from an autocmd', function()
+        local content = 'I Am A Callback'
+        meths.set_var('content', content)
+
+        local result = exec_lua([[
+          local cb = function() return vim.g.content end
+          vim.api.nvim_create_autocmd("User", {
+            pattern = "TestTrigger",
+            desc = "A test autocommand with a callback",
+            callback = cb,
+          })
+          local aus = vim.api.nvim_get_autocmds({ event = 'User', pattern = 'TestTrigger'})
+          local first = aus[1]
+          return {
+            cb = {
+              type = type(first.callback),
+              can_retrieve = first.callback() == vim.g.content
+            }
+          }
+        ]])
+
+        eq("function", result.cb.type)
+        eq(true, result.cb.can_retrieve)
+      end)
+
+      it('will return an empty string as the command for an autocmd that uses a callback', function()
+        local result = exec_lua([[
+          local callback = function() print 'I Am A Callback' end
+          vim.api.nvim_create_autocmd("BufWritePost", {
+            pattern = "*.py",
+            callback = callback,
+          })
+          local aus = vim.api.nvim_get_autocmds({ event = 'BufWritePost' })
+          local first = aus[1]
+          return {
+            command = first.command,
+            cbtype = type(first.callback)
+          }
+        ]])
+
+        eq({ command = "", cbtype = 'function' }, result)
+      end)
     end)
 
     describe('groups', function()