Adding option "--no-del" to include only additions

latexdiff

@@ -379,6 +379,7 @@ my ($type,$subtype,$floattype,$config,$preamblefile,$encoding,$nolabel,$visiblel
     $replacecontext1,$appendcontext1,
     $replacecontext2,$appendcontext2,
     $help,$verbose,$driver,$version,$ignorewarnings,
+    $onlyadditions,
     $enablecitmark,$disablecitmark,$allowspaces,$flatten,$nolinks,$debug,$earlylatexdiffpreamble);  ###$disablemathmark,
 my ($mboxsafe);
 # MNEMNONICS for mathmarkup
@@ -413,6 +414,7 @@ my ($pkg,%packages);
 # Defaults
 $mathmarkup=COARSE;
 $verbose=0;
+$onlyadditions=0;
 # output debug and intermediate files, set to 0 in final distribution
 $debug=0; 
 # insert preamble directly after documentclass - experimental feature, set to 0 in final distribution
@@ -477,6 +479,7 @@ GetOptions('type|t=s' => \$type,
 	   'filter-script=s' => \$filterscript,
        'ignore-filter-stderr' => \$ignorefilterstderr,
 	   'no-links' => \$nolinks,
+       'no-del' => \$onlyadditions,
 	   'version' => \$version,
 	   'help|h' => \$help,
 	   'debug!' => \$debug ) or die "Use latexdiff -h to get help.\n" ;
@@ -2893,9 +2896,14 @@ sub postprocess {
     # up. This case should be rare, so I just leave this in the diff file output. Not really elegant
     # but can still be dealt with later if it results in problems. 
     s/%DIFDELCMD < \\RIGHTBRACE/%DIFDELCMD < \\MBLOCKRIGHTBRACE/g ;
-    # Replace \RIGHTBRACE by }    
+    # Replace \RIGHTBRACE by }
     s/\\RIGHTBRACE/}/g;
 
+    # Optional: Remove deleted block entirely
+    if ($onlyadditions) {
+        s/\\DIFdelbegin.*?\\DIFdelend//sg ;
+    }
+
 ###    # change citation commands within comments to protect from processing
 ###    if ($CITECMD){
 ###      1 while s/(%.*)\\($CITECMD)/$1\\CITEDIF$2/m ;
@@ -3827,6 +3835,8 @@ be real files (not pipes or similar) as they are opened twice.
                        [ Default: scan the preamble for \\usepackage commands to determine
                          loaded packages.]
 
+--no-del               Supress deleted text from the diff.
+
 --show-preamble        Print generated or included preamble commands to stdout.
 
 --show-safecmd         Print list of regex matching and excluding safe commands.

testsuite/no-del-new.tex

@@ -0,0 +1,60 @@
+\documentclass[12pt,a4paper]{article}
+
+\setlength{\topmargin}{-0.2in}
+\setlength{\textheight}{9.5in}
+\setlength{\oddsidemargin}{0.0in}
+
+\setlength{\textwidth}{6in}
+
+\title{latexdiff Example - Revised version}
+\author{F Tilmann}
+% Note how in the preamble visual markup is never used (even
+% if some preamble might eventually end up as visible text.)
+
+\begin{document}
+\maketitle
+
+\section*{Introduction}
+
+This is an extremely simple document that showcases some of the latexdiff features.
+Type
+\begin{verbatim}
+latexdiff -t UNDERLINE example-draft.tex example-rev.tex > example-diff.tex
+\end{verbatim}
+to create the difference file.  You can inspect this file directly. Then run either 
+\begin{verbatim}
+pdflatex example-diff.tex
+xpdf example-diff.pdf
+\end{verbatim}
+or
+\begin{verbatim}
+latex example-diff.tex
+dvips -o example-diff.ps example-diff.dvi
+gv example-diff.ps
+\end{verbatim}
+to display the markup.
+
+\section*{Yet another section title}
+
+ More things could be said were it not for the constraints of time and space.
+
+A paragraph with a line only in the revised document.  More things could be 
+said were it not for the constraints of time and space.
+
+And here is a typo. 
+
+Here is a table:
+
+\begin{tabular}{ll}
+Name & Description \\
+\hline
+Gandalf & White \\
+Saruman & Evil
+\end{tabular}
+
+And now for something completely different, with not a paragraph in sight.
+No change, 
+no markup!
+\end{document}
+
+

testsuite/no-del-old.tex

@@ -0,0 +1,59 @@
+\documentclass[12pt,a4paper]{article}
+
+\setlength{\topmargin}{-0.2in}
+\setlength{\textheight}{9.5in}
+\setlength{\oddsidemargin}{0.0in}
+
+\setlength{\textwidth}{6.5in}
+
+\title{latexdiff Example - Draft version}
+\author{F Tilmann}
+
+\begin{document}
+\maketitle
+
+\section*{Introduction}
+
+This is an extremely simple document that showcases some of latexdiff features.
+Type
+\begin{verbatim}
+latexdiff -t UNDERLINE example-draft.tex example-rev.tex > example-diff.tex
+\end{verbatim}
+to create the difference file.  You can inspect this file directly. Then run either 
+\begin{verbatim}
+pdflatex example-diff.tex
+xpdf example-diff.pdf
+\end{verbatim}
+or
+\begin{verbatim}
+latex example-diff.tex
+dvips -o example-diff.ps example-diff.dvi
+gv example-diff.ps
+\end{verbatim}
+to display the markup.
+
+\section*{Another section title}
+
+A paragraph with a line only in the draft document.  More things could be said 
+were it not for the constraints of time and space.
+
+More things could be said were it not for the constraints of time and space.
+
+And here is a tipo. 
+
+Here is a table:
+
+\begin{tabular}{ll}
+Name & Description \\
+\hline
+Gandalf & Grey \\
+Saruman & White
+\end{tabular}
+
+And sometimes a whole paragraph gets completely rewritten. In this
+case latexdiff marks up the whole paragraph even if some words in it
+are identical.
+No change, no markup!
+\end{document}
+
+

testsuite/verify

@@ -22,6 +22,7 @@ DIFDELCMDBUG eqnarray eqnarray2 subscriptm delequ2 schneider gennady umesh under
 delequ3 delequ4 "simplefrac --allow-spaces" "master --flatten" "subfile --flatten" "import --flatten" titlediffTest2 exampleDiff bornd2 \
 "rolla --math-markup=2" mini "complex-maths --math-markup=1" margalit circonflex mwe-comment "apacite-test --flatten" quoteddollarunderscore units complicated-math move-equation2 lists "figures --graphics-markup=both" alignat "safecmd --append-safecmd=remark" verbatim verbatim2-is143 embedded-math-array "verbatim-input --flatten" anchordemo 'customdiffcmdtest --add-to-config "CUSTOMDIFCMD=blindtext;mypar;donothing;cmd"' description frac_w_space_comments \
 "href-in-bibliography --append-safecmd=path" revtex-bibliography biblatex 'txtcmd-with-multiple-arguments --append-textcmd=cmd' \
+"no-del --no-del" \
 )
 
 #set testroots= ( test subscript )