ScrollText now respects ANSI escape codes.

cli/build.gradle

@@ -11,7 +11,7 @@ dependencies {
   compile 'ch.qos.logback:logback-core:1.1.3'
   compile 'org.slf4j:slf4j-api:1.7.14'
   compile 'com.offbytwo:docopt:0.6.0.20150202'
-  compile 'com.jdbernard:jdb-util:4.3'
+  compile 'com.jdbernard:jdb-util:4.4'
   compile 'jline:jline:2.12'
   compile project(":wdiwtlt-core")
   compile 'uk.co.caprica:vlcj:3.10.1'

cli/src/main/groovy/com/jdbernard/wdiwtlt/cli/ScrollText.groovy

@@ -1,11 +1,14 @@
 package com.jdbernard.wdiwtlt.cli
 
+import com.jdbernard.util.AnsiEscapeCodeSequence as ANSI
+
 public class ScrollText {
 
     public String text = ""
     public int maxWidth
 
     private int scrollIdx
+    private String curAnsiPrefix = ""
 
     public void setMaxWidth(int max) {
         this.maxWidth = Math.max(max, 1) }
@@ -15,17 +18,52 @@ public class ScrollText {
         this.scrollIdx = Math.max(0, text.size() - 10) }
 
     public String getNextScroll() {
-        if (text.size() < maxWidth) return text
+        if (ANSI.strip(text).size() < maxWidth) return text
-        else {
-            scrollIdx = (scrollIdx + 1) % text.size()
-            int endIdx = Math.min(scrollIdx + maxWidth, text.size())
-            int wrapIdx = (scrollIdx + maxWidth) % text.size()
 
-            // don't need to wrap past the end
+        scrollIdx = (scrollIdx + 1) % text.size()
-            if (wrapIdx == endIdx) return text[scrollIdx..<endIdx]
+
-            return new StringBuilder()
+        // If we're on the start of an ANSI escape sequence, skip past the end
-                .append(text[scrollIdx..<endIdx])
+        // of it.
-                .append(" ").append(text[0..<wrapIdx]) } }
+        while (text[scrollIdx] == '\u001b') {
+          def endIdx = text.findIndexOf(scrollIdx) {
+            Character.isLetter(it.charAt(0)) }
+          curAnsiPrefix = text[scrollIdx..endIdx]
+          scrollIdx = (endIdx + 1) % text.size() }
+
+        int toWalk = maxWidth
+        int endIdx = scrollIdx + 1
+        int wrapIdx = 0
+
+        boolean inAnsiSeq = false
+        while (toWalk > 0 && wrapIdx < scrollIdx) {
+            def cur
+            if (endIdx == text.size()) {
+                cur = text[wrapIdx]
+
+                if (cur == '\u001b') inAnsiSeq = true
+
+                if (inAnsiSeq && Character.isLetter(cur.charAt(0)))
+                    inAnsiSeq = false
+
+                if (!inAnsiSeq) toWalk--
+                wrapIdx++ }
+
+            else {
+                cur = text[endIdx]
+
+                if (cur == '\u001b') inAnsiSeq = true
+
+                if (inAnsiSeq && Character.isLetter(cur.charAt(0)))
+                    inAnsiSeq = false
+
+                if (!inAnsiSeq) toWalk--
+                endIdx++ } }
+
+        if (wrapIdx == 0) return curAnsiPrefix + text[scrollIdx..<endIdx]
+        return new StringBuilder()
+            .append(curAnsiPrefix)
+            .append(text[scrollIdx..<endIdx])
+            .append(" ").append(text[0..<wrapIdx]) }
 
     public String toString() { return getNextScroll() }
 }