Updates to selection processing in addin

- Use global option regexplain.addin.max_lines (default 100)
- Give hint on warning about option
- Always use unique lines in selection

R/regex_gadget.R

     })
   }
 
-  viewer <- shiny::paneViewer(minHeight = 1000)
+  viewer <- shiny::paneViewer(minHeight = 800)
   runGadget(ui, server, viewer = viewer)
 }
 

R/rstudio_addins.R

-#' regexplain_addin
+#' RegExplain Addin
+#'
+#' Addin for regexplain. If the selection does not contain multiple lines, the
+#' addin tries to evaluate the selection and coerce the result to a character
+#' string. Only unique lines are passed to the gadget to maximize screen space.
+#' The max number of lines returned is set by the option
+#' `regexplain.addin.max_lines`, with a default value of 100 lines.
+#' If evaluating the selection does not produce a character vector without
+#' errors, the original selection is returned.
 #'
 #' @keywords internal
 regexplain_addin <- function() {
   # Get context text
   ctx_text <- context$selection[[1]]$text
 
+  max_lines <- getOption("rexeplain.addin.max_lines", 100)
+
   # If it is one line and evaluates to something, use that
   # Otherwise treat as text
   obj <- tryCatch({
     if (grepl("\n", ctx_text)) {
-      ctx_text[1:min(length(ctx_text), 100)]
+      ctx_text[1:min(length(ctx_text), max_lines)]
     } else {
       x <- eval(parse(text = ctx_text))
+      if (inherits(x, "list")) x <- unlist(x)
       x <- as.character(x)
       if (length(x) == 1 && grepl("\n", x))
         x <- strsplit(x, "\n")[[1]]
-      if (length(x) > 10) {
-        message(ctx_text, " gave ", length(x), " lines, limiting to first 10 unique lines.")
+      x <- unique(x)
+      if (length(x) > max_lines) {
+        message(ctx_text, " gave ", length(x), " lines, limiting to first ",
+                max_lines, " unique lines. Set ",
+                "options('regexplain.addin.max_lines') to a higher value to ",
+                "increase the number of lines.")
         x <- unique(x)
-        x[1:min(length(x), 10)]
+        x[1:min(length(x), max_lines)]
       } else x
     }
   },
-  error = function(e) {as.character(ctx_text[1:min(length(ctx_text), 100)])})
+  error = function(e) {as.character(ctx_text[1:min(length(ctx_text), max_lines)])})
 
   regex_gadget(if (length(obj) && obj != "") obj)
 
 }
 
-#' regexplain file loader
+#' Regexplain File Addin
+#'
+#' See [regexplain_addin]. Opens file chooser to pick file, reads lines, returns
+#' first `regexplain.addin.max_lines` (default 100).
 #'
 #' @keywords internal
 regexplain_file <- function() {
   fname <- file.choose()
   x <- readLines(fname)
-  if (length(x) > 100) {
-    message("There were ", format(length(x), big.mark = ","), " lines in ", fname, "\nUsing only first 100.")
-    x <- x[1:100]
+  max_lines <- getOption("rexeplain.addin.max_lines", 100)
+  if (length(x) > max_lines) {
+    message("There were ", format(length(x), big.mark = ","), " lines in ",
+            fname, "\nUsing only first ", max_lines, ".\n",
+            "Set options('regexplain.addin.max_lines') to a higher value to ",
+            "increase the number of lines.")
+    x <- x[1:max_lines]
   }
   regex_gadget(x, "RegEx")
 }

man/regexplain_addin.Rd

 % Please edit documentation in R/rstudio_addins.R
 \name{regexplain_addin}
 \alias{regexplain_addin}
-\title{regexplain_addin}
+\title{RegExplain Addin}
 \usage{
 regexplain_addin()
 }
 \description{
-regexplain_addin
+Addin for regexplain. If the selection does not contain multiple lines, the
+addin tries to evaluate the selection and coerce the result to a character
+string. Only unique lines are passed to the gadget to maximize screen space.
+The max number of lines returned is set by the option
+\code{regexplain.addin.max_lines}, with a default value of 100 lines.
+If evaluating the selection does not produce a character vector without
+errors, the original selection is returned.
 }
 \keyword{internal}

man/regexplain_file.Rd

 % Please edit documentation in R/rstudio_addins.R
 \name{regexplain_file}
 \alias{regexplain_file}
-\title{regexplain file loader}
+\title{Regexplain File Addin}
 \usage{
 regexplain_file()
 }
 \description{
-regexplain file loader
+See \link{regexplain_addin}. Opens file chooser to pick file, reads lines, returns
+first \code{regexplain.addin.max_lines} (default 100).
 }
 \keyword{internal}