Add news, docs and test to keybindings in RadioMenu (#42344)

Author: jonas-schulze

NEWS.md

@@ -81,7 +81,7 @@ Standard library changes
 #### Random
 
 #### REPL
-
+* `RadioMenu` now supports optional `keybindings` to directly select options ([#41576]).
 * ` ?(x, y` followed by TAB displays all methods that can be called
   with arguments `x, y, ...`. (The space at the beginning prevents entering help-mode.)
   `MyModule.?(x, y` limits the search to `MyModule`. TAB requires that at least one

stdlib/REPL/src/TerminalMenus/RadioMenu.jl

@@ -31,7 +31,9 @@ end
 
 """
 
-    RadioMenu(options::Array{String,1}; pagesize::Int=10, kwargs...)
+    RadioMenu(options::Array{String,1}; pagesize::Int=10,
+                                        keybindings::Vector{Char}=Char[],
+                                        kwargs...)
 
 Create a RadioMenu object. Use `request(menu::RadioMenu)` to get user input.
 `request()` returns an `Int` which is the index of the option selected by the
@@ -41,8 +43,12 @@ user.
 
   - `options::Array{String, 1}`: Options to be displayed
   - `pagesize::Int=10`: The number of options to be displayed at one time, the menu will scroll if length(options) > pagesize
+  - `keybindings::Vector{Char}=Char[]`: Shortcuts to pick corresponding entry from `options`
 
 Any additional keyword arguments will be passed to [`TerminalMenus.Config`](@ref).
+
+!!! compat "Julia 1.8"
+    The `keybindings` argument requires Julia 1.8 or later.
 """
 function RadioMenu(options::Array{String,1}; pagesize::Int=10, warn::Bool=true, keybindings::Vector{Char}=Char[], kwargs...)
     length(options) < 1 && error("RadioMenu must have at least one option")

stdlib/REPL/test/TerminalMenus/radio_menu.jl

@@ -50,3 +50,5 @@ radio_menu = RadioMenu(["single option"], charset=:ascii)
 @test simulate_input(1, radio_menu, :up, :up, :down, :up, :enter)
 radio_menu = RadioMenu(string.(1:3), pagesize=1, charset=:ascii)
 @test simulate_input(3, radio_menu, :down, :down, :down, :down, :enter)
+radio_menu = RadioMenu(["apple", "banana", "cherry"]; keybindings=collect('a':'c'), charset=:ascii)
+@test simulate_input(2, radio_menu, 'b')