readline: rename `deDupeHistory` option

Renames `options.deDupeHistory` → `options.removeHistoryDuplicates` for
`readline.createInterface(options)`.

The option name `removeHistoryDuplicates` is preferable to the
semantically identical name `deDupeHistory` because "dedupe" (short for
"deduplication") is obscure and neologistic while
`removeHistoryDuplicates` is clear, though verbose.

Updates tests and documentation for this option accordingly.

PR-URL: https://github.com/nodejs/node/pull/11950
Ref: https://github.com/nodejs/node/pull/2982
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/readline.js b/lib/readline.js
index 3b719560b6..d324561556 100644
--- a/lib/readline.js
+++ b/lib/readline.js
@@ -60,7 +60,7 @@ function Interface(input, output, completer, terminal) {
 
   EventEmitter.call(this);
   var historySize;
-  var deDupeHistory = false;
+  var removeHistoryDuplicates = false;
   let crlfDelay;
   let prompt = '> ';
 
@@ -70,7 +70,7 @@ function Interface(input, output, completer, terminal) {
     completer = input.completer;
     terminal = input.terminal;
     historySize = input.historySize;
-    deDupeHistory = input.deDupeHistory;
+    removeHistoryDuplicates = input.removeHistoryDuplicates;
     if (input.prompt !== undefined) {
       prompt = input.prompt;
     }
@@ -103,7 +103,7 @@ function Interface(input, output, completer, terminal) {
   this.output = output;
   this.input = input;
   this.historySize = historySize;
-  this.deDupeHistory = !!deDupeHistory;
+  this.removeHistoryDuplicates = !!removeHistoryDuplicates;
   this.crlfDelay = Math.max(kMincrlfDelay,
                             Math.min(kMaxcrlfDelay, crlfDelay >>> 0));
 
@@ -281,7 +281,7 @@ Interface.prototype._addHistory = function() {
   if (this.line.trim().length === 0) return this.line;
 
   if (this.history.length === 0 || this.history[0] !== this.line) {
-    if (this.deDupeHistory) {
+    if (this.removeHistoryDuplicates) {
       // Remove older history line if identical to new one
       const dupIndex = this.history.indexOf(this.line);
       if (dupIndex !== -1) this.history.splice(dupIndex, 1);