Show line numbers in progress bar when options(knitr.progress.linenum…

…s = TRUE)

NEWS.md

@@ -26,7 +26,7 @@
 
 - `imgur_upload()` requires fewer package dependencies now. It only requires the **curl** package; **httr** is no longer required, and **xml2** has become optional.
 
-- Progress bar includes the chunk location (`chunk-name @ file:line`) (@zeehio, #2232)
+- Progress bar includes the chunk location (`chunk-name @ file:line`) when `options(knitr.progress.linenums = TRUE)` is set. (@zeehio, #2232)
 
 # CHANGES IN knitr VERSION 1.42
 

R/output.R

@@ -291,16 +291,20 @@ process_file = function(text, output) {
   labels = unlist(lapply(groups, function(g) {
     if (is.list(g$params)) g[[c('params', 'label')]] else ''
   }))
-  linenums <- unlist(lapply(seq_along(groups), function(i) {
-    curr_lines <- current_lines(i)
-    sprintf(
-      "%s:%d-%d",
-      knit_concord$get('infile'),
-      curr_lines[1],
-      curr_lines[2]
-    )
-  }))
-  labels_linenums <- paste(labels, linenums, sep = " @ ")
+  if (getOption("knitr.progress.linenums", default = FALSE)) {
+    linenums <- unlist(lapply(seq_along(groups), function(i) {
+      curr_lines <- current_lines(i)
+      sprintf(
+        "%s:%d-%d",
+        knit_concord$get('infile'),
+        curr_lines[1],
+        curr_lines[2]
+      )
+    }))
+    labels_linenums <- paste(labels, linenums, sep = " @ ")
+  } else {
+    labels_linenums <- labels
+  }
   if (progress) {
     pb_fun = getOption('knitr.progress.fun', txt_pb)
     pb = if (is.function(pb_fun)) pb_fun(n, labels_linenums)