From 922f4f4ae5f201c8737c6d70e3f49ca1b4ab564d Mon Sep 17 00:00:00 2001
From: agnostic-apollo <agnosticapollo@gmail.com>
Date: Thu, 25 Mar 2021 09:08:45 +0500
Subject: [PATCH] Update TextDataUtils.getTruncatedCommandOutput() to support
 truncation from start or end and for (truncated) prefix

---
 .../termux/app/terminal/TermuxViewClient.java |  3 +-
 .../com/termux/app/utils/TextDataUtils.java   | 34 ++++++++++++++-----
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/app/src/main/java/com/termux/app/terminal/TermuxViewClient.java b/app/src/main/java/com/termux/app/terminal/TermuxViewClient.java
index 9bcf48d8..1f723493 100644
--- a/app/src/main/java/com/termux/app/terminal/TermuxViewClient.java
+++ b/app/src/main/java/com/termux/app/terminal/TermuxViewClient.java
@@ -336,12 +336,13 @@ public class TermuxViewClient implements TerminalViewClient {
         if (session == null) return;
 
         String transcriptText = session.getEmulator().getScreen().getTranscriptTextWithoutJoinedLines().trim();
+        if (transcriptText == null) return;
 
         try {
             // See https://github.com/termux/termux-app/issues/1166.
             Intent intent = new Intent(Intent.ACTION_SEND);
             intent.setType("text/plain");
-            transcriptText = TextDataUtils.getTruncatedCommandOutput(transcriptText, 100_000);
+            transcriptText = TextDataUtils.getTruncatedCommandOutput(transcriptText, TextDataUtils.TRANSACTION_SIZE_LIMIT_IN_BYTES, false, true, false).trim();
             intent.putExtra(Intent.EXTRA_TEXT, transcriptText);
             intent.putExtra(Intent.EXTRA_SUBJECT, mActivity.getString(R.string.title_share_transcript));
             mActivity.startActivity(Intent.createChooser(intent, mActivity.getString(R.string.title_share_transcript_with)));
diff --git a/app/src/main/java/com/termux/app/utils/TextDataUtils.java b/app/src/main/java/com/termux/app/utils/TextDataUtils.java
index fdde1b07..2ab2a015 100644
--- a/app/src/main/java/com/termux/app/utils/TextDataUtils.java
+++ b/app/src/main/java/com/termux/app/utils/TextDataUtils.java
@@ -8,18 +8,36 @@ import java.util.regex.Pattern;
 
 public class TextDataUtils {
 
-    // https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:media2/media2-session/src/main/java/androidx/media2/session/MediaUtils.java
-    public static final int TRANSACTION_SIZE_LIMIT_IN_BYTES = 256 * 1024; // 256KB
+    public static final int TRANSACTION_SIZE_LIMIT_IN_BYTES = 100 * 1024; // 100KB
+    public static final int LOGGER_ENTRY_SIZE_LIMIT_IN_BYTES = 4 * 1024; // 4KB
 
-    public static String getTruncatedCommandOutput(String text, int maxLength) {
-        if (text.length() > maxLength) {
+    public static String getTruncatedCommandOutput(String text, int maxLength, boolean fromEnd, boolean onNewline, boolean addPrefix) {
+        if(text == null) return null;
+
+        String prefix = "(truncated) ";
+
+        if(addPrefix)
+            maxLength = maxLength - prefix.length();
+
+        if(maxLength < 0 || text.length() < maxLength) return text;
+
+        if (fromEnd) {
+            text = text.substring(0, Math.min(text.length(), maxLength));
+        } else {
             int cutOffIndex = text.length() - maxLength;
-            int nextNewlineIndex = text.indexOf('\n', cutOffIndex);
-            if (nextNewlineIndex != -1 && nextNewlineIndex != text.length() - 1) {
-                cutOffIndex = nextNewlineIndex + 1;
+
+            if(onNewline) {
+                int nextNewlineIndex = text.indexOf('\n', cutOffIndex);
+                if (nextNewlineIndex != -1 && nextNewlineIndex != text.length() - 1) {
+                    cutOffIndex = nextNewlineIndex + 1;
+                }
             }
-            text = text.substring(cutOffIndex).trim();
+            text = text.substring(cutOffIndex);
         }
+
+        if(addPrefix)
+            text = prefix + text;
+
         return text;
     }