readline: remove max limit of crlfDelay

PR-URL: #13497
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>

doc/api/readline.md

@@ -369,7 +369,9 @@ changes:
   * `crlfDelay` {number} If the delay between `\r` and `\n` exceeds
     `crlfDelay` milliseconds, both `\r` and `\n` will be treated as separate
     end-of-line input. Default to `100` milliseconds.
-    `crlfDelay` will be coerced to `[100, 2000]` range.
+    `crlfDelay` will be coerced to a number no less than `100`. It can be set to
+    `Infinity`, in which case `\r` followed by `\n` will always be considered a
+    single newline.
   * `removeHistoryDuplicates` {boolean} If `true`, when a new input line added
     to the history list duplicates an older one, this removes the older line
     from the list. Defaults to `false`.

lib/readline.js

@@ -48,7 +48,6 @@ const {
 
 const kHistorySize = 30;
 const kMincrlfDelay = 100;
-const kMaxcrlfDelay = 2000;
 // \r\n, \n, or \r followed by something other than \n
 const lineEnding = /\r?\n|\r(?!\n)/;
 
@@ -120,8 +119,8 @@ function Interface(input, output, completer, terminal) {
   this.input = input;
   this.historySize = historySize;
   this.removeHistoryDuplicates = !!removeHistoryDuplicates;
-  this.crlfDelay = Math.max(kMincrlfDelay,
-                            Math.min(kMaxcrlfDelay, crlfDelay >>> 0));
+  this.crlfDelay = crlfDelay ?
+    Math.max(kMincrlfDelay, crlfDelay) : kMincrlfDelay;
 
   // Check arity, 2 - for async, 1 for sync
   if (typeof completer === 'function') {

test/parallel/test-readline-interface.js

@@ -63,14 +63,26 @@ function isWarned(emitter) {
 }
 
 {
-  // Maximum crlfDelay is 2000ms
+  // set crlfDelay to float 100.5ms
   const fi = new FakeInput();
   const rli = new readline.Interface({
     input: fi,
     output: fi,
-    crlfDelay: 1 << 30
+    crlfDelay: 100.5
   });
-  assert.strictEqual(rli.crlfDelay, 2000);
+  assert.strictEqual(rli.crlfDelay, 100.5);
+  rli.close();
+}
+
+{
+  // set crlfDelay to 5000ms
+  const fi = new FakeInput();
+  const rli = new readline.Interface({
+    input: fi,
+    output: fi,
+    crlfDelay: 5000
+  });
+  assert.strictEqual(rli.crlfDelay, 5000);
   rli.close();
 }
 
@@ -248,7 +260,7 @@ function isWarned(emitter) {
   rli.close();
 
   // Emit two line events when the delay
-  //   between \r and \n exceeds crlfDelay
+  // between \r and \n exceeds crlfDelay
   {
     const fi = new FakeInput();
     const delay = 200;
@@ -270,8 +282,55 @@ function isWarned(emitter) {
     }), delay * 2);
   }
 
+  // Emit one line events when the delay between \r and \n is
+  // over the default crlfDelay but within the setting value
+  {
+    const fi = new FakeInput();
+    const delay = 200;
+    const crlfDelay = 500;
+    const rli = new readline.Interface({
+      input: fi,
+      output: fi,
+      terminal: terminal,
+      crlfDelay
+    });
+    let callCount = 0;
+    rli.on('line', function(line) {
+      callCount++;
+    });
+    fi.emit('data', '\r');
+    setTimeout(common.mustCall(() => {
+      fi.emit('data', '\n');
+      assert.strictEqual(callCount, 1);
+      rli.close();
+    }), delay);
+  }
+
+  // set crlfDelay to `Infinity` is allowed
+  {
+    const fi = new FakeInput();
+    const delay = 200;
+    const crlfDelay = Infinity;
+    const rli = new readline.Interface({
+      input: fi,
+      output: fi,
+      terminal: terminal,
+      crlfDelay
+    });
+    let callCount = 0;
+    rli.on('line', function(line) {
+      callCount++;
+    });
+    fi.emit('data', '\r');
+    setTimeout(common.mustCall(() => {
+      fi.emit('data', '\n');
+      assert.strictEqual(callCount, 1);
+      rli.close();
+    }), delay);
+  }
+
   // \t when there is no completer function should behave like an ordinary
-  //   character
+  // character
   fi = new FakeInput();
   rli = new readline.Interface({ input: fi, output: fi, terminal: true });
   called = false;
@@ -517,7 +576,7 @@ function isWarned(emitter) {
     assert.strictEqual(isWarned(process.stdout._events), false);
   }
 
-  //can create a new readline Interface with a null output arugument
+  // can create a new readline Interface with a null output arugument
   fi = new FakeInput();
   rli = new readline.Interface({input: fi, output: null, terminal: terminal });