Fix newlines in commit messages

Add a newline example in commit message and double line ending for paragraph test.
Include the test in the documentation.

Author: MacLotsen

doc/git-scenario.sh

@@ -42,7 +42,12 @@ bob
 
 curl https://raw.githubusercontent.com/github/gitignore/main/TeX.gitignore > .gitignore
 git add .gitignore
-git commit -m "Add gitignore" --date="2017-08-06 12:03"
+git commit -m "Add gitignore
+
+Get the TeX.gitignore from the gitignore repository and
+use it for this project.
+
+From github" --date="2017-08-06 12:03"
 
 charlie
 

doc/gitinfo-lua.tex

@@ -314,11 +314,13 @@ \section*{Changelog}
 \end{description}
     \end{lstlisting}
     \noindent
-    \newcommand\commitline[1]{\item #1}
+    \newcommand\commitline[2]{\item #1
+
+    #2}
     \newcommand\formatversion[3]{%
         \item[#1] \gittag[(taggerdate)(taggerdate:short)(authordate:short)]{printdate}{#1}
         \begin{itemize}
-            \forgitcommit[s]{commitline}{#3}
+            \forgitcommit[s,b]{commitline}{#3}
         \end{itemize}%
     }%
     \setlength{\fboxsep}{16pt}%

scripts/gitinfo-lua.lua

@@ -45,7 +45,8 @@ local api = {
         ['{'] = '\\{',
         ['}'] = '\\}',
         ['~'] = '\\textasciitilde ',
-        ['%^'] = '\\textasciicircum '
+        ['%^'] = '\\textasciicircum ',
+        ['\n'] = ' '
     }
 }
 local mt = {
@@ -73,6 +74,7 @@ end
 
 function api:escape_str(value)
     local buf = string.gsub(value, '\\', '\\textbackslash ')
+    buf = string.gsub(buf, "\n%s*\n+", "\\par ")
     for search, replace in pairs(self.escape_chars) do
         buf = string.gsub(buf, search, replace)
     end