feat(output): open output for last test run (#120)

doc/neotest.txt

@@ -323,6 +323,7 @@ window will be used
 {short} `(boolean)` Show shortened output
 {enter} `(boolean)` Enter output window
 {quiet} `(boolean)` Suppress warnings of no output
+{last_run} `(boolean)` Open output for last test run
 {position_id} `(string)` Open output for position with this ID, opens nearest
 position if not given
 {adapter} `(string)` Adapter ID, defaults to first found with matching position
@@ -423,6 +424,12 @@ neotest.run.adapters()                                  *neotest.run.adapters()*
                             `neotest.run.adapters`()
 Get the list of all known adapter IDs.
 
+neotest.run.get_last_run()                          *neotest.run.get_last_run()*
+                          `neotest.run.get_last_run`()
+Get last test run tree and adapter id.
+Return~
+`(string)` | nil, table | nil Position id and last args table
+
 
 ==============================================================================
 neotest.status                                                  *neotest.status*

lua/neotest/consumers/output.lua

@@ -154,6 +154,7 @@ end
 ---@field short boolean Show shortened output
 ---@field enter boolean Enter output window
 ---@field quiet boolean Suppress warnings of no output
+---@field last_run boolean Open output for last test run
 ---@field position_id string Open output for position with this ID, opens nearest
 --- position if not given
 ---@field adapter string Adapter ID, defaults to first found with matching position
@@ -171,7 +172,16 @@ function neotest.output.open(opts)
   end
   async.run(function()
     local tree, adapter_id
-    if not opts.position_id then
+    if opts.last_run then
+      local position_id, last_args = require("neotest").run.get_last_run()
+      if position_id and last_args then
+        tree, adapter_id = client:get_position(position_id, last_args)
+      end
+      if not tree then
+        lib.notify("Last test run no longer exists")
+        return
+      end
+    elseif not opts.position_id then
       local file_path = vim.fn.expand("%:p")
       local row = vim.fn.getbufinfo(file_path)[1].lnum - 1
       tree, adapter_id = client:get_nearest(file_path, row, opts)

lua/neotest/consumers/run.lua

@@ -197,6 +197,15 @@ function neotest.run.adapters()
   return client:get_adapters()
 end
 
+--- Get last test run tree and adapter id.
+---@return string | nil, table | nil Position id and last args table
+function neotest.run.get_last_run()
+  if not last_run then
+    return nil, nil
+  end
+  return unpack(last_run)
+end
+
 neotest.run = setmetatable(neotest.run, {
   __call = function(_, client_)
     client = client_