feat: support auto-saving a named session

lua/auto-session/autocmds.lua

@@ -152,6 +152,8 @@ local function setup_dirchanged_autocmds(AutoSession)
 
       AutoSession.AutoSaveSession()
       AutoSession.run_cmds "pre_cwd_changed"
+      -- clear vim.v.this_session so it doesn't leak into another directory
+      vim.v.this_session = ""
     end,
     pattern = "global",
   })

lua/auto-session/init.lua

@@ -314,8 +314,16 @@ function AutoSession.AutoSaveSession()
     end
   end
 
+  local current_session = nil
+
+  -- If there's an existing session, use that name
+  if vim.v.this_session then
+    current_session = Lib.escaped_session_name_to_session_name(vim.fn.fnamemodify(vim.v.this_session, ":t"))
+    Lib.logger.debug("Using existing session name: " .. current_session)
+  end
+
   -- Don't try to show a message as we're exiting
-  return AutoSession.SaveSession(nil, false)
+  return AutoSession.SaveSession(current_session, false)
 end
 
 ---@private

tests/allowed_dirs_spec.lua

@@ -40,6 +40,9 @@ describe("The allowed dirs config", function()
     -- Change to a sub directory to see if it's allowed
     vim.cmd "cd tests/test_files"
 
+    -- clear out any existing session
+    vim.v.this_session = ""
+
     local session_path = TL.makeSessionPath(vim.fn.getcwd())
     assert.equals(0, vim.fn.filereadable(session_path))
 
@@ -57,6 +60,9 @@ describe("The allowed dirs config", function()
       vim.cmd("e " .. TL.test_file)
       c.allowed_dirs = { vim.fn.getcwd() .. "/tests/symlink-test" }
 
+      -- clear out any existing session
+      vim.v.this_session = ""
+
       vim.fn.system "ln -snf test_files tests/symlink-test"
       vim.cmd "cd tests/symlink-test"