docs: update README.md

Author: olimorris

README.md

@@ -408,7 +408,7 @@ vim.api.nvim_create_autocmd("VimEnter", {
 })
 ```
 
-**Git Branching from directories that are not the CWD** by [mrloop](https://github.com/mrloop)
+**Git Branching and Sub-directories** by [mrloop](https://github.com/mrloop)
 
 As per [#149](https://github.com/olimorris/persisted.nvim/discussions/149), if you invoke Neovim from a sub-directory then the git branch will not be detected. The code below amends for this:
 
@@ -432,7 +432,7 @@ As per [#149](https://github.com/olimorris/persisted.nvim/discussions/149), if y
 }
 ```
 
-**Ignore Branches**
+**Ignore Certain Branches**
 
 If you'd like to ignore certain branches from being saved as a session:
 
@@ -462,6 +462,31 @@ If you'd like to ignore certain branches from being saved as a session:
 }
 ```
 
+**Only Save Certain Sessions**
+
+You may wish to only save a session if the current working directory is in a table of allowed directories:
+
+```lua
+{
+  "olimorris/persisted.nvim",
+  lazy = false,
+  config = function()
+    local persisted = require("persisted")
+    local utils = require("persisted.utils")
+    local allowed_dirs = {
+      "~/code",
+      "~/notes/api"
+    }
+
+    persisted.setup({
+      should_save = function()
+        return utils.dirs_match(vim.fn.getcwd(), allowed_dirs)
+      end,
+    })
+  end,
+}
+```
+
 <!-- panvimdoc-ignore-start -->
 
 ## :clap: Acknowledgements

doc/persisted.nvim.txt

@@ -429,8 +429,7 @@ Autoloading a session if arguments are passed to Neovim:
     })
 <
 
-**Git Branching from directories that are not the CWD** by mrloop
-<https://github.com/mrloop>
+**Git Branching and Sub-directories** by mrloop <https://github.com/mrloop>
 
 As per #149 <https://github.com/olimorris/persisted.nvim/discussions/149>, if
 you invoke Neovim from a sub-directory then the git branch will not be
@@ -456,7 +455,7 @@ detected. The code below amends for this:
     }
 <
 
-**Ignore Branches**
+**Ignore Certain Branches**
 
 If you’d like to ignore certain branches from being saved as a session:
 
@@ -486,6 +485,32 @@ If you’d like to ignore certain branches from being saved as a session:
     }
 <
 
+**Only Save Certain Sessions**
+
+You may wish to only save a session if the current working directory is in a
+table of allowed directories:
+
+>lua
+    {
+      "olimorris/persisted.nvim",
+      lazy = false,
+      config = function()
+        local persisted = require("persisted")
+        local utils = require("persisted.utils")
+        local allowed_dirs = {
+          "~/code",
+          "~/notes/api"
+        }
+    
+        persisted.setup({
+          should_save = function()
+            return utils.dirs_match(vim.fn.getcwd(), allowed_dirs)
+          end,
+        })
+      end,
+    }
+<
+
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