Add ability to session based on cwd and git branch

This creates session files like:

%Users%Oli%Code%Projects%persistance_feature%add-git-branch-to-session

enabling you to segment your project directory by git branch

lua/persistence/config.lua

@@ -3,6 +3,7 @@ local M = {}
 ---@class PersistenceOptions
 local defaults = {
   dir = vim.fn.expand(vim.fn.stdpath("config") .. "/sessions/"), -- directory where session files are saved
+  use_git_branch = false, -- create session files based on the branch of the git enabled repository
   options = { "buffers", "curdir", "tabpages", "winsize" }, -- sessionoptions used for saving
 }
 

lua/persistence/init.lua

@@ -6,7 +6,21 @@ local e = vim.fn.fnameescape
 
 function M.get_current()
   local name = vim.fn.getcwd():gsub("/", "%%")
-  return Config.options.dir .. name .. ".vim"
+  return Config.options.dir .. name .. M.get_branch() ..".vim"
+end
+
+function M.get_branch()
+  if Config.options.use_git_branch == true then
+    local branch = vim.api.nvim_exec([[!git rev-parse --abbrev-ref HEAD]], true)
+    -- The command returns two lines. We only need the second one
+    lines = {}
+    for s in branch:gmatch("[^\r\n]+") do
+      table.insert(lines, '_' .. s)
+    end
+    return lines[2]:gsub("/", "%%")
+  end
+
+  return ''
 end
 
 function M.get_last()
@@ -33,8 +47,8 @@ end
 
 function M.stop()
   vim.cmd([[
-  autocmd! Persistence
-  augroup! Persistence
+    autocmd! Persistence
+    augroup! Persistence
   ]])
 end