add a current session history menu (nushell#378)

* add a current session history menu

* Update current_session_history_menu.nu

* Delete non_default_vars_menu.nu

custom-menus/README.md

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+# Custom menus folder 
+
+In this folder you can find custom menus for nushell. 
+
+To make them work:
+1. insert the code of chosen menu into the `menus` section of the `config.nu` file. 
+2. Check, that the name of the menu is uniqe
+3. Add a shortcut to call for the needed menu in the `keybindings` section of the `config.nu` file
+

custom-menus/current_session_history_menu.nu

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+# The part below should be pasted inside the 'menus' list of the 'config.nu' file 
+
+ {
+ # session menu
+ name: current_session_history_menu
+ only_buffer_difference: false
+ marker: "# "
+ type: {
+ layout: list
+ page_size: 10
+ }
+ style: {
+ text: green
+ selected_text: green_reverse
+ description_text: yellow
+ }
+ source: { |buffer, position|
+
+ history -l 
+ | where session_id == (history session)
+ | select command
+ | where command =~ $buffer
+ | each { |it| {value: $it.command } }
+ | reverse
+ | uniq
+ }
+
+# The part below should be pasted into the 'keybindgs' list of the 'config.nu' file
+
+ {
+ name: "current_session_history_menu"
+ modifier: alt
+ keycode: char_r
+ mode: emacs
+ event: { send: menu name: current_session_history_menu }
+ }