move row label justification from latex_options to its own parameter so that it can be used in html tables
diff --git a/R/kable_styling.R b/R/kable_styling.R
index 40498e5..bad743d 100644
--- a/R/kable_styling.R
+++ b/R/kable_styling.R
@@ -23,8 +23,7 @@
 #' `scale_down` is useful for super wide table. It will automatically adjust
 #' the table to page width. `repeat_header` in only meaningful in a longtable
 #' environment. It will let the header row repeat on every page in that long
-#' table. `row_label_right` will right justify the row labels and `row_label_center`
-#' will center justify the row labels.  Default justification is left.
+#' table.
 #' @param full_width A `TRUE` or `FALSE` variable controlling whether the HTML
 #' table should have 100\% width. Since HTML and pdf have different flavors on
 #' the preferable format for `full_width`. If not specified, a HTML table will
@@ -36,6 +35,9 @@
 #' a `LaTeX` table, if `float_*` is selected, `LaTeX` package `wrapfig` will be
 #' imported.
 #' @param font_size A numeric input for table font size
+#' @param row_label_position A character string determining the justification of the row
+#' labels in a table.  Possible values inclued `l` for left, `c` for center, and `r` for
+#' right.  The default value is `l` for left justifcation.
 #' @param ... extra options for HTML or LaTeX. See `details`.
 #'
 #' @details For LaTeX, extra options includes:
@@ -60,6 +62,7 @@
                           full_width = NULL,
                           position = "center",
                           font_size = NULL,
+                          row_label_position = "l",
                           ...) {
 
   if (length(bootstrap_options) == 1 && bootstrap_options == "basic") {
@@ -89,6 +92,9 @@
     if (is.null(full_width)) {
       full_width <- getOption("kable_styling_full_width", T)
     }
+    if(!missing(row_label_position)) {
+      warning("'row_label_position' is not active for HTML tables yet and parameter will not be used.")
+    }
     return(htmlTable_styling(kable_input,
                              bootstrap_options = bootstrap_options,
                              full_width = full_width,
@@ -103,7 +109,9 @@
                             latex_options = latex_options,
                             full_width = full_width,
                             position = position,
-                            font_size = font_size, ...))
+                            font_size = font_size,
+                            row_label_position = row_label_position,
+                            ...))
   }
 }
 
@@ -187,12 +195,12 @@
                              repeat_header_method = c("append", "replace"),
                              repeat_header_continued = FALSE,
                              stripe_color = "gray!6",
-                             latex_table_env = NULL) {
+                             latex_table_env = NULL,
+                             row_label_position) {
 
   latex_options <- match.arg(
     latex_options,
-    c("basic", "striped", "hold_position", "HOLD_position", "scale_down", "repeat_header",
-      "row_label_right","row_label_center"),
+    c("basic", "striped", "hold_position", "HOLD_position", "scale_down", "repeat_header"),
     several.ok = T
   )
 
@@ -252,22 +260,16 @@
   out <- structure(out, format = "latex", class = "knitr_kable")
   attr(out, "kable_meta") <- table_info
 
-  if ("row_label_right" %in% latex_options | "row_label_center" %in% latex_options) {
-    if ( "row_label_right" %in% latex_options ) {
-      row_label_orientation <- "r"
-    } else {
-      row_label_orientation <- "c"
-    }
-
+  if (row_label_position != "l") {
     if(table_info$tabular=="longtable") {
       out <- sub("\\\\begin\\{longtable\\}\\{l",
                  paste0("\\\\begin\\{longtable\\}\\{",
-                        row_label_orientation),
+                        row_label_position),
                  out)
     } else {
       out <- sub("\\\\begin\\{tabular\\}\\{l",
                  paste0("\\\\begin\\{tabular\\}\\{",
-                        row_label_orientation),
+                        row_label_position),
                  out)
     }
   }