add book option

eisvogel.tex

@@ -44,7 +44,7 @@
 $if(dir)$$if(latex-dir-rtl)$
 \PassOptionsToPackage{RTLdocument}{bidi}
 $endif$$endif$%
-\documentclass[$if(fontsize)$$fontsize$,$endif$$if(lang)$$babel-lang$,$endif$$if(papersize)$$papersize$paper,$else$a4paper,$endif$$if(beamer)$ignorenonframetext,$if(handout)$handout,$endif$$if(aspectratio)$aspectratio=$aspectratio$,$endif$$endif$$for(classoption)$$classoption$$sep$,$endfor$,tablecaptionabove]{scrartcl}
+\documentclass[$if(fontsize)$$fontsize$,$endif$$if(lang)$$babel-lang$,$endif$$if(papersize)$$papersize$paper,$else$a4paper,$endif$$if(beamer)$ignorenonframetext,$if(handout)$handout,$endif$$if(aspectratio)$aspectratio=$aspectratio$,$endif$$endif$$for(classoption)$$classoption$$sep$,$endfor$,tablecaptionabove]{$if(book)$scrbook$else$scrartcl$endif$}
 $if(beamer)$
 $if(background-image)$
 \usebackgroundtemplate{%