REPL: Remove hard-coded prompt strings in favour of pre-existing cons…

…tants (#55109)

stdlib/REPL/docs/src/index.md

@@ -50,7 +50,7 @@ julia> ans
 
 In Julia mode, the REPL supports something called *prompt pasting*. This activates when pasting text
 that starts with `julia> ` into the REPL. In that case, only expressions starting with `julia> ` (as
-well as the other REPL mode prompts: `shell> `, `help?> `, `pkg>` ) are parsed, but others are
+well as the other REPL mode prompts: `shell> `, `help?> `, `pkg> ` ) are parsed, but others are
 removed. This makes it possible to paste a chunk of text that has been copied from a REPL session
 without having to scrub away prompts and outputs. This feature is enabled by default but can be
 disabled or enabled at will with `REPL.enable_promptpaste(::Bool)`. If it is enabled, you can try it

stdlib/REPL/src/Pkg_beforeload.jl

@@ -125,5 +125,5 @@ function Pkg_promptf()
         end
     end
     # Note no handling of Pkg.offline, as the Pkg version does here
-    return "$(prefix)pkg> "
+    return "$(prefix)$(PKG_PROMPT)"
 end

stdlib/REPL/src/REPL.jl

@@ -1257,7 +1257,7 @@ function setup_interface(
         on_enter = return_callback)
 
     # Setup help mode
-    help_mode = Prompt(contextual_prompt(repl, "help?> "),
+    help_mode = Prompt(contextual_prompt(repl, HELP_PROMPT),
         prompt_prefix = hascolor ? repl.help_color : "",
         prompt_suffix = hascolor ?
             (repl.envcolors ? Base.input_color : repl.input_color) : "",
@@ -1354,8 +1354,8 @@ function setup_interface(
 
     shell_prompt_len = length(SHELL_PROMPT)
     help_prompt_len = length(HELP_PROMPT)
-    jl_prompt_regex = r"^In \[[0-9]+\]: |^(?:\(.+\) )?julia> "
-    pkg_prompt_regex = r"^(?:\(.+\) )?pkg> "
+    jl_prompt_regex = Regex("^In \\[[0-9]+\\]: |^(?:\\(.+\\) )?$JULIA_PROMPT")
+    pkg_prompt_regex = Regex("^(?:\\(.+\\) )?$PKG_PROMPT")
 
     # Canonicalize user keymap input
     if isa(extra_repl_keymap, Dict)
@@ -1769,7 +1769,7 @@ function run_frontend(repl::StreamREPL, backend::REPLBackendRef)
         if have_color
             print(repl.stream,repl.prompt_color)
         end
-        print(repl.stream, "julia> ")
+        print(repl.stream, JULIA_PROMPT)
         if have_color
             print(repl.stream, input_color(repl))
         end