move the extra menus of Nushell into custom-menus/extra/ (nushell#550)

* add the extra menus in `custom-menus/extra/`

* add some notes about how to use the extra menus in bindings

custom-menus/extra/commands.nu

@@ -0,0 +1,30 @@
+# can be used in the REPL by adding something like the following block to `$env.config.keybindings` in your `config.nu`
+# {
+# name: commands_menu
+# modifier: control
+# keycode: char_t
+# mode: [emacs, vi_normal, vi_insert]
+# event: { send: menu name: commands_menu }
+# }
+
+{
+ name: commands_menu
+ only_buffer_difference: false
+ marker: "# "
+ type: {
+ layout: columnar
+ columns: 4
+ col_width: 20
+ col_padding: 2
+ }
+ style: {
+ text: green
+ selected_text: green_reverse
+ description_text: yellow
+ }
+ source: { |buffer, position|
+ scope commands
+ | where name =~ $buffer
+ | each { |it| {value: $it.name description: $it.usage} }
+ }
+}

custom-menus/extra/commands_with_description.nu

@@ -0,0 +1,32 @@
+# can be used in the REPL by adding something like the following block to `$env.config.keybindings` in your `config.nu`
+# {
+# name: commands_with_description_menu
+# modifier: control
+# keycode: char_s
+# mode: [emacs, vi_normal, vi_insert]
+# event: { send: menu name: commands_with_description }
+# }
+
+{
+ name: commands_with_description_menu
+ only_buffer_difference: true
+ marker: "# "
+ type: {
+ layout: description
+ columns: 4
+ col_width: 20
+ col_padding: 2
+ selection_rows: 4
+ description_rows: 10
+ }
+ style: {
+ text: green
+ selected_text: green_reverse
+ description_text: yellow
+ }
+ source: { |buffer, position|
+ scope commands
+ | where name =~ $buffer
+ | each { |it| {value: $it.name description: $it.usage} }
+ }
+}

custom-menus/extra/vars.nu

@@ -0,0 +1,29 @@
+# can be used in the REPL by adding something like the following block to `$env.config.keybindings` in your `config.nu`
+# {
+# name: vars_menu
+# modifier: alt
+# keycode: char_o
+# mode: [emacs, vi_normal, vi_insert]
+# event: { send: menu name: vars_menu }
+# }
+
+{
+ name: vars_menu
+ only_buffer_difference: true
+ marker: "# "
+ type: {
+ layout: list
+ page_size: 10
+ }
+ style: {
+ text: green
+ selected_text: green_reverse
+ description_text: yellow
+ }
+ source: { |buffer, position|
+ scope variables
+ | where name =~ $buffer
+ | sort-by name
+ | each { |it| {value: $it.name description: $it.type} }
+ }
+}