Embed view_regex in html documents easily

- Removed knitr parameter
- Add result_only (not in knitr)
- Soft deprecate kntir parameter
- Separate group.css from other css styles

R/regex_gadget.R

 
   # ---- UI ----
   ui <- miniPage(
-    shiny::includeCSS(system.file("styles", "style.css", package = "regexplain")),
+    shiny::includeCSS(system.file("styles", "groups.css", package = "regexplain")),
     shiny::includeCSS(system.file("styles", "gadget.css", package = "regexplain")),
     gadgetTitleBar(
       "RegExplain",

R/run_regex.R

 #' @param pattern Regex pattern to look for
 #' @param render Render results to an HTML doc and open in RStudio viewer?
 #' @param escape Escape HTML-related characters in `text`?
-#' @param knitr Print into knitr doc? If `TRUE`, marks text as `asis_output` and
-#'   sets `render = FALSE` and `escape = TRUE`.
 #' @param exact Should the regex pattern be displayed as entered by the user
 #'   into R console or source (default)? When `TRUE`, regex is displayed with
 #'   the double `\\\\` required for escaping backslashes in R. When `FALSE`,
 #'   regex is displayed as interpreted by the regex engine (i.e. double `\\\\`
 #'   as a single `\\`).
+#' @param result_only Should only the result be displayed? If `FALSE`, then
+#'   the colorized regular expression is also displayed in the output.
 #' @inheritDotParams base::regexec ignore.case perl fixed useBytes
 #' @export
 view_regex <- function(
   ...,
   render = TRUE,
   escape = render,
-  knitr = FALSE,
-  exact = escape
+  exact = escape,
+  result_only = FALSE
 ) {
+  knitr <- isTRUE(getOption('knitr.in.progress'))
   if (knitr) {
     render <- FALSE
     escape <- TRUE
   }
-  res <- run_regex(text, pattern, ...)
+  regex_opts <- deprecate_knitr_option(...)
+  regex_opts$text <- text
+  regex_opts$pattern <- pattern
+  res <- do.call(run_regex, regex_opts)
   res <- purrr::map_chr(res, wrap_result, escape = escape, exact = exact)
   res <- purrr::map_chr(res, function(resi) {
     result_pad <- ""
   })
   res <- paste(res, collapse = "")
   if (!nchar(pattern)) res <- paste("<p class='results'>", text, "</p>")
-  if (knitr) return(knitr::asis_output(res))
+  if (knitr) {
+    # embed css
+    css <- if (!isTRUE(getOption("regexplain.knitr_css_loaded"))) paste(
+      "<style>",
+      paste(readLines(system.file("styles", "groups.css", package = "regexplain")), collapse = "\n"),
+      "</style>",
+      sep = "\n")
+    if (!is.null(css)) options("regexplain.knitr_css_loaded" = TRUE)
+    return(knitr::asis_output(paste(css, res, sep = "\n")))
+  }
   if (!render) return(res)
-  head <- c(
+  head <- if (!result_only) c(
     "---", "pagetitle: View Regex", "---",
     "<h5>Pattern</h5>",
     "<p><pre>", wrap_regex(pattern, escape, exact), "</pre></p>",
     rmarkdown::render(
       tmp,
       output_format = rmarkdown::html_document(css = c(system.file("styles", 'skeleton.css', package='regexplain'),
-                                                       system.file("styles", 'style.css', package='regexplain')),
+                                                       system.file("styles", 'view_regex.css', package='regexplain'),
+                                                       system.file("styles", 'groups.css', package='regexplain')),
                                                theme = NULL,
                                                md_extensions = "-autolink_bare_uris"),
       quiet = TRUE
   ))
   rstudioapi::viewer(tmp_html)
 }
+
+deprecate_knitr_option <- function(...) {
+  regex_opts <- list(...)
+  if ("knitr" %in% names(regex_opts)) {
+    warning("The `knitr` parameter of `view_regex()` has been removed. Running `view_regex()` in R Markdown is automatically detected.")
+  }
+  regex_opts[setdiff(names(regex_opts), "knitr")]
+}

inst/styles/gadget.css

 #help_text_selected > h3 {
   margin-top: 0px;
 }
+
+.gadget-result {
+  border: 1px solid #ccc;
+  border-radius: 0.5rem;
+  padding: 8px;
+  overflow-wrap: break-word;
+}

inst/styles/style.css → inst/styles/groups.css

   font-family: monospace;
   color: #888888;
 }
-
-.gadget-result {
-  border: 1px solid #ccc;
-  border-radius: 0.5rem;
-  padding: 8px;
-  overflow-wrap: break-word;
-}
-
 .group {
   border-bottom: 2px solid;
   color: black;
   padding: 0px;
 }
-
 .g00 {
   padding: 1px;
   background-color: #f0f0f0;
   border-right: 1px solid #b0b0b0;
   border-top: 1px solid #b0b0b0;
 }
-
 .g01 {
   border-color: green;
   color: green;
 }
-
 .g02 {
   border-color: blue;
   color: blue;
 }
-
 .g03 {
   border-color: red;
   color: red;
 }
-
 .g04 {
   border-color: orange;
   color: orange;
 }
-
 .g05 {
   border-color: purple;
   color: purple;
 }
-
 .g06 {
   border-color: DeepPink;
   color: DeepPink;
 }
-
 .g07 {
   border-color: Tomato;
   color: Tomato;
 }
-
 .g08 {
   border-color: DarkSeaGreen;
   color: DarkSeaGreen;
 }
-
 .g09 {
   border-color: DeepSkyBlue;
   color: DeepSkyBlue;
 }
-
 .g10 {
   border-color: Sienna;
   color: Sienna;
 }
-
 .pad01 {
   padding-bottom: 3px;
 }
   padding-bottom: 25px;
   margin-bottom: 25px;
 }
-
-pre,
-blockquote,
-dl,
-figure,
-table,
-p,
-ul,
-ol,
-form {
-  margin-bottom: 1rem; }
-
-body {
-  line-height: 18px;}

inst/styles/view_regex.css

+pre,
+blockquote,
+dl,
+figure,
+table,
+p,
+ul,
+ol,
+form {
+  margin-bottom: 1rem; }
+
+body {
+  line-height: 18px;}