Implement ale.queue for calling ale#Queue in Lua

doc/ale.txt

@@ -4506,19 +4506,21 @@ ale#Pad(str)                                                        *ale#Pad()*
   parts of a command from variables.
 
 
-ale#Queue(delay, [linting_flag, buffer_number])                   *ale#Queue()*
+ale.queue(delay, [linting_flag, buffer])                          *ale.queue()*
+ale#Queue(delay, [linting_flag, buffer])                          *ale#Queue()*
 
   Run linters for the current buffer, based on the filetype of the buffer,
   with a given `delay`. A `delay` of `0` will run the linters immediately.
   The linters will always be run in the background. Calling this function
-  again from the same buffer
+  several times will reset an internal timer so ALE doesn't check buffers too
+  often.
 
   An optional `linting_flag` argument can be given. If `linting_flag` is
   `'lint_file'`, then linters where the `lint_file` option evaluates to `1`
   will be run. Otherwise, those linters will not be run.
 
-  An optional `buffer_number` argument can be given for specifying the buffer
-  to check. The active buffer (`bufnr('')`) will be checked by default.
+  An optional `buffer` argument can be given for specifying the buffer to
+  check. The active buffer (`bufnr('')`) will be checked by default.
 
                                                                 *ale-cool-down*
   If an exception is thrown when queuing/running ALE linters, ALE will enter

lua/ale/init.lua

@@ -55,6 +55,21 @@ ale.setup = setmetatable({
     end,
 })
 
+---Run ALE linters on a buffer after a delay.
+---
+---If a delay in milliseconds multiple times, the internal timer used by ALE
+---will be reset, so ALE doesn't lint too often.
+---
+---If the `linting_flag` is not 'lint_file' then linters that require files to
+---be saved will no be run.
+---@param delay number Milliseconds to wait for. A delay of 0 lints immediately.
+---@param linting_flag string|nil If set to 'lint_file', run all linters.
+---@param buffer number|nil The buffer to check. Defaults to the current buffer.
+---@return nil
+ale.queue = function(delay, linting_flag, buffer)
+    vim.fn["ale#Queue"](delay, linting_flag, buffer)
+end
+
 ---Check if ALE supports a given feature.
 ---
 ---The ALE version can be checked with ale.has("ale-1.0.0"), etc.

test/lua/ale_queue_spec.lua

@@ -0,0 +1,40 @@
+local eq = assert.are.same
+local ale = require("ale")
+
+describe("ale.queue", function()
+    local queue_calls
+
+    setup(function()
+        _G.vim = {
+            fn = {
+                ["ale#Queue"] = function(...)
+                    table.insert(queue_calls, {...})
+                end,
+            },
+        }
+    end)
+
+    teardown(function()
+        _G.vim = nil
+    end)
+
+    before_each(function()
+        queue_calls = {}
+    end)
+
+    it("should call ale#Queue with the right arguments", function()
+        ale.queue(0)
+        ale.queue(0, "")
+        ale.queue(123, "lint_file")
+        ale.queue(0, "", 42)
+        ale.queue(123, "lint_file", 42)
+
+        eq({
+            {0, nil, nil},
+            {0, "", nil},
+            {123, "lint_file", nil},
+            {0, "", 42},
+            {123, "lint_file", 42},
+        }, queue_calls)
+    end)
+end)