Add support for fullwidth characters and Unicode surrogate pairs (#6)

Author: kevva

package.json

@@ -32,7 +32,7 @@
     "ansi"
   ],
   "dependencies": {
-    "slice-ansi": "0.0.4",
+    "slice-ansi": "^1.0.0",
     "string-width": "^2.0.0"
   },
   "devDependencies": {

readme.md

@@ -2,7 +2,7 @@
 
 > Truncate a string to a specific width in the terminal
 
-Gracefully handles [ANSI escapes](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors_and_Styles). Like a string styled with [`chalk`](https://github.com/chalk/chalk).
+Gracefully handles [ANSI escapes](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors_and_Styles). Like a string styled with [`chalk`](https://github.com/chalk/chalk). It also supports Unicode surrogate pairs and fullwidth characters.
 
 
 ## Install
@@ -27,8 +27,16 @@ cliTruncate('unicorn', 4, {position: 'start'});
 cliTruncate('unicorn', 4, {position: 'middle'});
 //=> 'un…n'
 
-cliTruncate('\u001b[31municorn\u001b[39m', 4);
-//=> '\u001b[31muni\u001b[39m…'
+cliTruncate('\u001B[31municorn\u001B[39m', 4);
+//=> '\u001B[31muni\u001B[39m…'
+
+// Truncate Unicode surrogate pairs
+cliTruncate('uni\uD83C\uDE00corn', 5);
+//=> 'uni\uD83C\uDE00…'
+
+// Truncate fullwidth characters
+cliTruncate('안녕하세요', 3);
+//=> '안…'
 
 // Truncate the paragraph to the terminal width
 const paragraph = 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.';

test.js

@@ -1,9 +1,6 @@
 import test from 'ava';
 import m from './';
 
-// Because of https://github.com/chalk/slice-ansi/issues/6
-const mootEscapes = '\u001b[31m\u001b[31m\u001b[31m\u001b[31m';
-
 test(t => {
 	t.is(m('unicorn', 4), 'uni…');
 	t.is(m('unicorn', 4, {position: 'end'}), 'uni…');
@@ -13,12 +10,11 @@ test(t => {
 	t.is(m('unicorn', 20), 'unicorn');
 	t.is(m('unicorn', 7), 'unicorn');
 	t.is(m('unicorn', 6), 'unico…');
-	t.is(m('\u001b[31municorn\u001b[39m', 7), '\u001b[31municorn\u001b[39m');
-	t.is(m('\u001b[31municorn\u001b[39m', 1), '…');
-	t.is(m('\u001b[31municorn\u001b[39m', 4), mootEscapes + '\u001b[31muni\u001b[39m…');
-	// TODO
-	// t.skip.is(m('a\ud83c\ude00b\ud83c\ude00c', 5), 'a\ud83c\ude00b…', 'surrogate pairs');
-	// t.skip.is(m('안녕하세요', 3), '안…', 'wide char');
+	t.is(m('\u001B[31municorn\u001B[39m', 7), '\u001B[31municorn\u001B[39m');
+	t.is(m('\u001B[31municorn\u001B[39m', 1), '…');
+	t.is(m('\u001B[31municorn\u001B[39m', 4), '\u001B[31muni\u001B[39m…');
+	t.is(m('a\uD83C\uDE00b\uD83C\uDE00c', 5), 'a\uD83C\uDE00b\uD83C\uDE00…', 'surrogate pairs');
+	t.is(m('안녕하세요', 3), '안…', 'wide char');
 	t.is(m('unicorn', 5, {position: 'start'}), '…corn');
 	t.is(m('unicorn', 6, {position: 'start'}), '…icorn');
 	t.is(m('unicorn', 5, {position: 'middle'}), 'un…rn');