Introduce prose() function

For now, it prepends `#'` but in a way that might hold up if we use Rmd for the template.

R/reprex-undo.R

@@ -149,15 +149,15 @@ reprex_undo <- function(input = NULL,
   src <- switch(
     where,
     clipboard = ingest_clipboard(),
-    path = read_lines(input),
-    input = escape_newlines(sub("\n$", "", input)),
+    path      = read_lines(input),
+    input     = escape_newlines(sub("\n$", "", input)),
     NULL
   )
   comment <- arg_option(comment)
 
+  outfile_given <- !is.null(outfile)
   infile <- if (where == "path") input else NULL
-  outfile_requested <- !is.null(outfile)
-  if (outfile_requested) {
+  if (outfile_given) {
     files <- make_filenames(make_filebase(outfile, infile), suffix = "clean")
     r_file <- files[["r_file"]]
     if (would_clobber(r_file)) {
@@ -171,11 +171,7 @@ reprex_undo <- function(input = NULL,
     } else {
       line_info <- classify_lines(src, comment = comment)
     }
-    x_out <- ifelse(
-      line_info == "prose" & nzchar(src),
-      paste("#'", src),
-      src
-    )
+    x_out <- ifelse(line_info == "prose" & nzchar(src), prose(src), src)
     x_out <- x_out[!line_info %in% c("output", "bt", "so_header") & nzchar(src)]
     x_out <- sub("^    ", "", x_out)
   } else if (is.null(prompt)) { ## reprex_clean
@@ -190,7 +186,7 @@ reprex_undo <- function(input = NULL,
     clipr::write_clip(x_out)
     message("Clean code is on the clipboard.")
   }
-  if (outfile_requested) {
+  if (outfile_given) {
     writeLines(x_out, r_file)
     message("Writing clean code as R script:\n  * ", r_file)
   }

R/reprex.R

@@ -394,11 +394,7 @@ reprex_render <- function(input, std_out_err = NULL) {
 
 convert_md_to_r <- function(lines, comment = "#>") {
   line_info <- classify_lines_bt(lines, comment = comment)
-  lines <- ifelse(
-    line_info == "prose" & nzchar(lines),
-    paste("#'", lines),
-    lines
-  )
+  lines <- ifelse(line_info == "prose" & nzchar(lines), prose(lines), lines)
   lines[line_info != "bt"]
 }
 

R/utils.R

@@ -85,3 +85,7 @@ inject_file <- function(path, inject_path, pre_process = enfence, ...) {
   writeLines(lines, path)
   path
 }
+
+prose <- function(x) {
+  paste0("#' ", x)
+}

R/whisker.R

@@ -8,7 +8,10 @@ apply_template <- function(x, reprex_data = NULL) {
   ))
 
   if (!is.null(reprex_data$std_file)) {
-    data$std_file_stub <- paste0("#' `", reprex_data$std_file, "`\n#'")
+    data$std_file_stub <- prose(c(
+      encodeString(reprex_data$std_file, quote = "`"),
+      "\n"
+    ))
   }
 
   if (isTRUE(reprex_data$si)) {
@@ -20,13 +23,13 @@ apply_template <- function(x, reprex_data = NULL) {
   }
 
   if (reprex_data$venue == "gh") {
-    data$si_start <- "#'<details><summary>Session info</summary>"
-    data$si_end   <- "#'</details>"
+    data$si_start <- prose("<details><summary>Session info</summary>")
+    data$si_end   <- prose("</details>")
   }
 
   if (reprex_data$venue == "so") {
     data$yaml <- yaml_md("md")
-    data$so_syntax_highlighting <- "#'<!-- language-all: lang-r -->"
+    data$so_syntax_highlighting <- prose("<!-- language-all: lang-r -->")
     ## empty line between html comment re: syntax highlighting and reprex code
     x <- c("", x)
   }
@@ -73,5 +76,5 @@ yaml_md <- function(flavor = c("gfm", "md"),
   )
   ## prepend with `#' ` in a separate step because
   ## https://github.com/klutometis/roxygen/issues/668
-  paste0("#' ", yaml, collapse = "\n")
+  paste0(prose(yaml), collapse = "\n")
 }