Move stringr to Suggests

Replaced a few calls to stringr with stringi (which has to stay for unicode encoding function). Not likely that people won't have stringr, but makes the dependencies a little better.

DESCRIPTION

     rstudioapi,
     shiny (>= 0.13),
     stringi,
-    stringr,
     tidyr,
     utils
 Suggests: 
-    testthat,
-    rematch2
+    rematch2,
+    stringr,
+    testthat
 Encoding: UTF-8
 LazyData: true
 Roxygen: list(markdown = TRUE)

R/gadget_server.R

           req(replacement())
           regexFn(
             rtext(),
-            stringr::regex(
+            stringr_regex(
               pattern(),
               ignore_case = 'ignore.case' %in% input$regex_options,
               literal = 'fixed' %in% input$regex_options
         } else {
           regexFn(
             rtext(),
-            stringr::regex(
+            stringr_regex(
               pattern(),
               ignore_case = 'ignore.case' %in% input$regex_options,
               literal = 'fixed' %in% input$regex_options
       print(x)
     })
 
+    stringr_regex <- function(pattern, ignore_case = FALSE, literal = FALSE) {
+      if (!requireNamespace("stringr", quietly = TRUE)) return(NULL)
+      do.call(
+        eval(parse(text = "stringr::regex")),
+        list(pattern = pattern, ignore_case, ignore_case, literal = literal)
+      )
+    }
+
     # ---- Server - Tab - Help ----
     HELP_DEFAULT_TEXT <- c(
       "<h3>Welcome to RegExplain</h3>",
 
     observeEvent(input$help_try_this_hs_colors_text, {
       color_match <- "\\b(red|orange|yellow|green|blue|purple)\\b|red"
-      color_text <- stringr::sentences[grepl(color_match, stringr::sentences)]
-      color_text <- sample(color_text, 25)
-      updateTextAreaInput(session, "text", value = paste(color_text, collapse = "\n"))
-      showNotification("Text loaded! View it in Text tab", type = 'message')
+      if (requireNamespace("stringr", quietly = TRUE)) {
+        color_text <- stringr::sentences[grepl(color_match, stringr::sentences)]
+        color_text <- sample(color_text, 25)
+        updateTextAreaInput(session, "text", value = paste(color_text, collapse = "\n"))
+        showNotification("Text loaded! View it in Text tab", type = 'message')
+      } else {
+        showNotification("Please install {stringr} for this example", type = 'error')
+      }
     })
 
     observeEvent(input$help_try_this_hs_colors_pattern, {
     })
 
     observeEvent(input$help_try_this_hs_words_text, {
-      hs_text <- sample(stringr::sentences, 25)
-      updateTextAreaInput(session, "text", value = paste(hs_text, collapse = "\n"))
-      showNotification("Text loaded! View it in Text tab", type = 'message')
+      if (requireNamespace("stringr", quietly = TRUE)) {
+        hs_text <- sample(stringr::sentences, 25)
+        updateTextAreaInput(session, "text", value = paste(hs_text, collapse = "\n"))
+        showNotification("Text loaded! View it in Text tab", type = 'message')
+      } else {
+        showNotification("Please install {stringr} for this example", type = 'error')
+      }
     })
 
     observeEvent(input$help_try_this_hs_words_pattern, {
     })
 
     observeEvent(input$help_try_this_hs_refs_text, {
-      hs_text <- sample(stringr::sentences, 25)
-      updateTextAreaInput(session, "text", value = paste(hs_text, collapse = "\n"))
-      showNotification("Text loaded! View it in Text tab", type = 'message')
+      if (requireNamespace("stringr", quietly = TRUE)) {
+        hs_text <- sample(stringr::sentences, 25)
+        updateTextAreaInput(session, "text", value = paste(hs_text, collapse = "\n"))
+        showNotification("Text loaded! View it in Text tab", type = 'message')
+      } else {
+        showNotification("Please install {stringr} for this example", type = 'error')
+      }
     })
 
     observeEvent(input$help_try_this_hs_refs_pattern, {

R/regex.R

   res <- purrr::map_chr(res, function(resi) {
     result_pad <- ""
     if (grepl("pad\\d{2}", resi)) {
-      max_pad <- max(stringr::str_extract_all(resi, "pad\\d{2}")[[1]])
-      max_pad_level <- as.integer(stringr::str_extract(max_pad, "\\d{2}"))
+      max_pad <- max(stringi::stri_extract_all_regex(resi, "pad\\d{2}")[[1]])
+      max_pad_level <- as.integer(stringi::stri_extract_all_regex(max_pad, "\\d{2}"))
       if (max_pad_level - 3 > 0) {
         result_pad <- sprintf("pad%02d", max_pad_level - 3)
       }