Trigger input$help_default to load default text

and allow overriding default help text when loading server side help section

R/help_ui.R

         shiny::tags$ul(
           id = "help-sidebar",
           if (!cheatsheet_only) tags$li(
-            shiny::actionLink("help_try_this", "Try This")
+            shiny::actionLink("help_default", "Introduction"),
+            shiny::actionLink("help_try_this", "Try These Examples")
           ),
           shiny::tags$li("Character Classes", class = "header"),
           shiny::tags$ul(

R/regex_gadget.R

     })
 
     # ---- Server - Tab - Help ----
+    HELP_DEFAULT_TEXT <- paste0(
+      "<h3>Welcome to RegExplain</h3>",
+      "<p>Choose a category from the menu on the left.</p>"
+    )
+
     source(system.file("shiny", "help_server.R", package = "regexplain"), local = TRUE)
 
     load_buttons <- function(..., extra_btns = NULL) {

inst/shiny/help_server.R

-HELP_DEFAULT_TEXT <- "<p>Select a category from the left sidebar.</p>"
+if (!exists('HELP_DEFAULT_TEXT')) HELP_DEFAULT_TEXT <- "<p>Select a category from the left sidebar.</p>"
 
 help_text <- reactiveVal(HELP_DEFAULT_TEXT)
 
   } else HTML(help_body)
 })
 
+observeEvent(input$help_default, {
+  help_text(HELP_DEFAULT_TEXT)
+})
+
 observeEvent(input$help_cat_character_classes_regular, {
   make_help_tab_text("character classes", "regular")
 })