From 726e117656ef5f153adea486d16d21041fcc06b0 Mon Sep 17 00:00:00 2001
From: Gustavo Silva <gustavosantaremsilva@gmail.com>
Date: Tue, 29 Oct 2019 23:12:24 +0000
Subject: [PATCH] diff.mjs: Allows showing subtraction

    Adds "Show Subtraction" button to allow seeing only the difference
    between two texts.
    When selected and combined, user can see only the characters or
    words that were added. If not combined, with either removed or added
    but selected, then nothing is displayed.
---
 src/core/operations/Diff.mjs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/core/operations/Diff.mjs b/src/core/operations/Diff.mjs
index 7adea178..921369e8 100644
--- a/src/core/operations/Diff.mjs
+++ b/src/core/operations/Diff.mjs
@@ -47,6 +47,11 @@ class Diff extends Operation {
                 "type": "boolean",
                 "value": true
             },
+            {
+                "name": "Show subtraction",
+                "type": "boolean",
+                "value": true
+            },
             {
                 "name": "Ignore whitespace",
                 "type": "boolean",
@@ -67,6 +72,7 @@ class Diff extends Operation {
                 diffBy,
                 showAdded,
                 showRemoved,
+                showSubtraction,
                 ignoreWhitespace
             ] = args,
             samples = input.split(sampleDelim);
@@ -116,8 +122,8 @@ class Diff extends Operation {
                 if (showAdded) output += "<span class='hl5'>" + Utils.escapeHtml(diff[i].value) + "</span>";
             } else if (diff[i].removed) {
                 if (showRemoved) output += "<span class='hl3'>" + Utils.escapeHtml(diff[i].value) + "</span>";
-            } else {
-                output += Utils.escapeHtml(diff[i].value);
+            } else if (!showSubtraction) {
+                output += Utils.escapeHtml(diff[i].value) + "</span>";
             }
         }