always consider empty strings as no value given

lib/templates.ts

@@ -6,23 +6,23 @@ function convertLineBreaks(lines: string) {
 
 export function brief(options: IDocProps) {
   const {
-    template = 'brief-fam',
-    subject = '',
-    yourRef = '',
-    yourRefName = 'Ihr Zeichen',
-    yourMail = '',
-    myRef = '',
-    customer = '',
-    invoice = '',
-    date = '\\today',
-    signature = '',
-    specialMail = '',
-    address = 'Max Mustermann\\\\Musterstrasse\\\\12345 Musterstadt',
-    opening = 'Sehr geehrte Damen und Herren',
-    body = '',
-    closing = 'Mit freundlichen Grüßen',
-    ps = '',
-    enclosing = '',
+    template,
+    subject,
+    yourRef,
+    yourRefName,
+    yourMail,
+    myRef,
+    customer,
+    invoice,
+    date,
+    signature,
+    specialMail,
+    address,
+    opening,
+    body,
+    closing,
+    ps,
+    enclosing,
   } = { ...options }
 
   return `% brief document
@@ -31,17 +31,15 @@ export function brief(options: IDocProps) {
 
 \\setkomavar{subject}{${subject}}
 
-\\setkomavar{yourref}[${yourRefName}]{${yourRef}}
-\\setkomavar{yourmail}{${yourMail}}
-\\setkomavar{myref}{${myRef}}
-\\setkomavar{customer}{${customer}}
-\\setkomavar{invoice}{${invoice}}
+${yourRef ? `\\setkomavar{yourref}[${yourRefName}]{${yourRef}}` : ''}
+${yourMail ? `\\setkomavar{yourmail}{${yourMail}}` : ''}
+${myRef ? `\\setkomavar{myref}{${myRef}}` : ''}
+${customer ? `\\setkomavar{customer}{${customer}}` : ''}
+${invoice ? `\\setkomavar{invoice}{${invoice}}` : ''}
+${signature ? `\\setkomavar{signature}{${signature}}` : ''}
+${specialMail ? `\\setkomavar{specialmail}{${specialMail}}` : ''}
 
-\\setkomavar{date}{${date}}
-
-%\\setkomavar{signature}{${signature}}
-
-\\setkomavar{specialmail}{${specialMail}}
+${date ? `\\setkomavar{date}{${date}}` : ''}
 
 \\begin{document}
 \\begin{letter}{${convertLineBreaks(address)}}
@@ -52,9 +50,9 @@ export function brief(options: IDocProps) {
 
     \\closing{${closing}}
 
-    \\ps{${ps}}
+    ${ps ? `\\ps{${ps}}` : ''}
 
-    %\\encl{${enclosing}}
+    ${enclosing ? `\\encl{${enclosing}}` : ''}
 
 \\end{letter}
 \\end{document}`