account for legacy spacing

Author: galactixx

stringwrap.go

@@ -439,18 +439,23 @@ func stringWrap(
 		case unicode.IsSpace(r):
 			stateMachine.flushWordBuffer()
 
-			// All legacy whitespace is ignored and not written
-			// to the line buffer.
+			// Handle the different types of whitespace characters
+			// in the string (e.g., space, newline, tab, etc.).
 			switch r {
 			case ' ':
 				stateMachine.writeSpaceToLine(r)
-			case '\n':
+			case '\n', '\r', '\u0085', '\u2028', '\u2029':
 				stateMachine.writeHardLine()
 				positions.incrementOrigLine()
 				positions.origLineSegment = 0
 			case '\t':
 				adjTabSize := stateMachine.writeTabToLine()
 				positions.curLineWidth += adjTabSize
+			case '\v', '\f':
+				/* ignore */
+			default:
+				stateMachine.writeSpaceToLine(r)
+				positions.curLineWidth += runewidth.RuneWidth(r) - 1
 			}
 			state = -1
 			idx += rSize

stringwrap_test.go

@@ -101,6 +101,34 @@ func TestStringWrap(t *testing.T) {
 			trimWhitespace: false,
 			splitWord:      true,
 		},
+		{
+			input:          "hello\rworld",
+			wrapped:        "hello\nworld",
+			limit:          10,
+			trimWhitespace: true,
+			splitWord:      false,
+		},
+		{
+			input:          "foo\u2028bar baz",
+			wrapped:        "foo\nbar\nbaz",
+			limit:          5,
+			trimWhitespace: true,
+			splitWord:      false,
+		},
+		{
+			input:          "Supercalifragilisticexpialidocious\vness",
+			wrapped:        "Supercali-\nfragilist-\nicexpiali-\ndociousne-\nss",
+			limit:          10,
+			trimWhitespace: true,
+			splitWord:      true,
+		},
+		{
+			input:          "foo\u2028barbazbaz",
+			wrapped:        "foo\nbarb-\nazbaz",
+			limit:          5,
+			trimWhitespace: true,
+			splitWord:      true,
+		},
 	}
 
 	for idx, tt := range tests {