configuable plantUML server address

Author: yosmoc

browser/lib/markdown.js

@@ -145,11 +145,13 @@ class Markdown {
     const deflate = require('markdown-it-plantuml/lib/deflate')
     this.md.use(require('markdown-it-plantuml'), '', {
       generateSource: function (umlCode) {
+        const stripTrailingSlash = (url) => url.endsWith('/') ? url.slice(0, -1) : url
+        const serverAddress = stripTrailingSlash(config.preview.plantUMLServerAddress) + '/svg'
         const s = unescape(encodeURIComponent(umlCode))
         const zippedCode = deflate.encode64(
           deflate.zip_deflate(`@startuml\n${s}\n@enduml`, 9)
         )
-        return `http://www.plantuml.com/plantuml/svg/${zippedCode}`
+        return `${serverAddress}/${zippedCode}`
       }
     })
 

browser/main/modals/PreferencesModal/UiTab.js

@@ -94,6 +94,7 @@ class UiTab extends React.Component {
         latexInlineClose: this.refs.previewLatexInlineClose.value,
         latexBlockOpen: this.refs.previewLatexBlockOpen.value,
         latexBlockClose: this.refs.previewLatexBlockClose.value,
+        plantUMLServerAddress: this.refs.previewPlantUMLServerAddress.value,
         scrollPastEnd: this.refs.previewScrollPastEnd.checked,
         smartQuotes: this.refs.previewSmartQuotes.checked,
         sanitize: this.refs.previewSanitize.value
@@ -544,6 +545,19 @@ class UiTab extends React.Component {
               />
             </div>
           </div>
+          <div styleName='group-section'>
+            <div styleName='group-section-label'>
+              {i18n.__('PlantUML Server')}
+            </div>
+            <div styleName='group-section-control'>
+              <input styleName='group-section-control-input'
+                ref='previewPlantUMLServerAddress'
+                value={config.preview.plantUMLServerAddress}
+                onChange={(e) => this.handleUIChange(e)}
+                type='text'
+              />
+            </div>
+          </div>
 
           <div styleName='group-control'>
             <button styleName='group-control-rightButton'