rich text styles formatting, fixes #5

Author: musketyr

docs/index.adoc

@@ -674,6 +674,12 @@ _Result_
 
 image:rich_text.png[]
 
+[WARNING]
+====
+Some older versions that 3.13 of Apache POI does not handle rich texts well. Please, make sure
+you are using at least version 3.13.
+====
+
 === Data formats
 You can assing a data format using the `format` method. Detailed guide how the format works can be found in
 link:https://support.microsoft.com/en-us/kb/298368[How to control and understand settings in the Excel for Format Cells

spreadsheet-builder-poi/src/main/groovy/org/modelcatalogue/builder/spreadsheet/poi/PoiCell.groovy

@@ -165,6 +165,9 @@ class PoiCell extends AbstractCell implements  Resolvable {
 
     @Override
     void text(String run, @DelegatesTo(Font.class) @ClosureParams(value = FromString.class, options = "org.modelcatalogue.builder.spreadsheet.api.Font") Closure fontConfiguration) {
+        if (!run) {
+            return
+        }
         int start = 0
         if (richTextParts) {
             start = richTextParts.last().end

spreadsheet-builder-poi/src/main/groovy/org/modelcatalogue/builder/spreadsheet/poi/PoiFont.groovy

@@ -33,7 +33,7 @@ class PoiFont extends AbstractHTMLColorProvider implements Font {
 
     @Override
     void size(int size) {
-        font.fontHeightInPoints = (short) size
+        font.setFontHeightInPoints(size.shortValue())
     }
 
     @Override

spreadsheet-builder-poi/src/test/groovy/org/modelcatalogue/builder/spreadsheet/poi/PoiExcelBuilderSpec.groovy

@@ -68,6 +68,59 @@ class PoiExcelBuilderSpec extends Specification {
 
                         }
                     }
+                    row {
+                        cell {
+                            style {
+                                wrap text
+                            }
+                            text 'First Line'
+                            text '\n'
+                            text 'Second Line', {
+                                bold
+                                size 12
+                            }
+                            text '\n'
+                            for (Map.Entry<String, String> entry in [foo: 'bar', boo: 'cow', empty: '', '':'nothing']) {
+                                text entry.key, {
+                                    bold
+                                }
+                                text ': '
+                                text  entry.value
+                                text '\n'
+                            }
+                            text '\n\n'
+                            text 'Next line after two spaces'
+                            text '\n'
+                            text 'Last line', {
+                                italic
+                            }
+                            text '\n'
+                        }
+                    }
+
+                    row {
+                        cell {
+                            text 'Genomics England Consent Withdrawal Options'
+                            text '\n\n'
+                            text 'Enumerations', {
+                                size 12
+                                bold
+                            }
+                            text '\n'
+
+                            for (Map.Entry<String, String> entry in [
+                                    FULL_WITHDRAWAL: 'OPTION 2: FULL WITHDRAWAL: No further use',
+                                    PARTIAL_WITHDRAWAL: 'OPTION 1: PARTIAL WITHDRAWAL: No further contact'
+                            ]) {
+                                text entry.key, {
+                                    bold
+                                }
+                                text ': '
+                                text  entry.value
+                                text '\n'
+                            }
+                        }
+                    }
                 }
 
                 sheet('Cell Adressing') {