feat(config): Add possibility to ignore branches

Configure branches where autoload and autosave are disabled. Allows to
specify lua patterns and partial matches.

README.md

@@ -161,6 +161,7 @@ require("persisted").setup({
   follow_cwd = true, -- change session file name to match current working directory if it changes
   allowed_dirs = nil, -- table of dirs that the plugin will auto-save and auto-load from
   ignored_dirs = nil, -- table of dirs that are ignored when auto-saving and auto-loading
+  ignored_branches = nil, -- table of branch patterns that are ignored for auto-saving and auto-loading
   telescope = {
     reset_prompt = true, -- Reset the Telescope prompt after an action?
     mappings = { -- table of mappings for the Telescope extension
@@ -322,6 +323,19 @@ require("persisted").setup({
 
 In this setup, `~/.config` and `~/.local/nvim` are still going to behave in their default setting (ignoring all listed directory and its children), however `/` and `/tmp` will only ignore those directories exactly.
 
+### Ignored branches
+
+You may specify a table of patterns that match against braches for which the plugin will **never** autosave and autoload from. For example:
+
+```lua
+require("persisted").setup({
+  ignored_branches = {
+    "^master",
+    "feature/%u"
+  },
+})
+```
+
 ### Events / Callbacks
 
 The plugin fires events at various points during its lifecycle:

lua/persisted/config.lua

@@ -17,6 +17,7 @@ local defaults = {
   follow_cwd = true, -- change session file name with changes in current working directory
   allowed_dirs = nil, -- table of dirs that the plugin will auto-save and auto-load from
   ignored_dirs = nil, -- table of dirs that are ignored for auto-saving and auto-loading
+  ignored_branches = nil, -- table of branch patterns that are ignored for auto-saving and auto-loading
 
   telescope = {
     reset_prompt = true, -- Reset prompt after a telescope action?

lua/persisted/init.lua

@@ -79,6 +79,19 @@ local function ignore_dir(dir)
   return utils.dirs_match(dir, ignored_dirs)
 end
 
+---Is the current branch ignored for auto-saving and loading?
+---@param dir string Branch to be used for the session
+---@return boolean
+local function ignore_branch(branch)
+  local ignored_branches = config.options.ignored_branches
+
+  if ignored_branches == nil then
+    return false
+  end
+
+  return utils.table_match(branch, ignored_branches) ~= nil
+end
+
 ---Get the session that was saved last
 ---@return string
 local function get_last()
@@ -91,6 +104,24 @@ local function get_last()
   return sessions[1]
 end
 
+
+---Get the current Git branch name, untouched
+---@param dir? string Directory to be used for the session
+---@return string|nil
+local function get_branchname(dir)
+  dir = dir or session_dir()
+  vim.fn.system('git -C "' .. dir .. '" rev-parse 2>/dev/null')
+
+  local git_enabled = (vim.v.shell_error == 0)
+
+  if git_enabled then
+    local git_branch = vim.fn.systemlist('git -C "' .. dir .. '" rev-parse --abbrev-ref HEAD 2>/dev/null')
+    return git_branch[1]
+  end
+
+  return nil
+end
+
 ---Get the current Git branch
 ---@param dir? string Directory to be used for the session
 ---@return string|nil
@@ -154,10 +185,12 @@ end
 function M.setup(opts)
   config.setup(opts)
   local dir = session_dir()
+  local branch = get_branchname()
 
   if
     config.options.autosave
     and (allow_dir(dir) and not ignore_dir(dir) and vim.g.persisting == nil)
+    and not ignore_branch(branch)
     and args_check()
   then
     M.start()
@@ -171,6 +204,7 @@ end
 function M.load(opt, dir)
   opt = opt or {}
   dir = dir or session_dir()
+  local branch = get_branchname()
 
   local session = opt.session or (opt.last and get_last() or get_current(dir))
 
@@ -185,7 +219,11 @@ function M.load(opt, dir)
     end
   end
 
-  if config.options.autosave and (allow_dir(dir) and not ignore_dir(dir)) then
+  if
+    config.options.autosave
+    and (allow_dir(dir) and not ignore_dir(dir))
+    and not ignore_branch(branch)
+  then
     M.start()
   end
 end
@@ -194,9 +232,10 @@ end
 ---@return nil
 function M.autoload()
   local dir = session_dir()
+  local branch = get_branchname()
 
   if config.options.autoload and args_check() then
-    if allow_dir(dir) and not ignore_dir(dir) then
+    if allow_dir(dir) and not ignore_dir(dir) and not ignore_branch(branch) then
       M.load({}, dir)
     end
   end

lua/persisted/utils.lua

@@ -82,7 +82,15 @@ end
 ---@return boolean
 function M.dirs_match(dir, dirs_table)
   dir = vim.fn.expand(dir)
-  return dirs_table
+  return M.table_match(dir, dirs_table, function(pattern) return escape_pattern(vim.fn.expand(pattern)) end)
+end
+
+---Check if a string matches and entry in a given table
+---@param needle string
+---@param heystack table
+---@return boolean
+function M.table_match(needle, heystack, escape_fct)
+  return heystack
     and next(vim.tbl_filter(function(pattern)
       if pattern.exact then
         -- The pattern is actually a table
@@ -92,11 +100,14 @@ function M.dirs_match(dir, dirs_table)
         if pattern:sub(-1) == fp_sep and pattern:len() > 1 then
           pattern = pattern:sub(1, -2)
         end
-        return dir == pattern
+        return needle == pattern
       else
-        return dir:find(escape_pattern(vim.fn.expand(pattern)))
+        if escape_fct then
+          pattern = escape_fct(pattern)
+        end
+        return needle:match(pattern)
       end
-    end, dirs_table))
+    end, heystack))
 end
 
 ---Get the directory pattern based on OS