From 83393ef5b827a1793718e59c0a81bdd7325e6f0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=B6ren=20Weber?= <mail@soeren-weber.de>
Date: Sat, 19 Feb 2022 14:21:16 +0100
Subject: [PATCH] variant: add download for generator #188

---
 .../content/basics/generator/_index.en.md     | 42 ++++++++++++++++++-
 layouts/partials/stylesheet.html              |  2 +-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/exampleSite/content/basics/generator/_index.en.md b/exampleSite/content/basics/generator/_index.en.md
index 0361a98364..6ae1717e78 100644
--- a/exampleSite/content/basics/generator/_index.en.md
+++ b/exampleSite/content/basics/generator/_index.en.md
@@ -18,6 +18,8 @@ This is best seen in the `neon` variant with the differnet headings colors. Ther
 
 <div id="vargenerator" class="mermaid" style="background-color: var(--INTERNAL-MAIN-TEXT-color);" align="center">Graph</div>
 
+<a id="vardownload" class="btn btn-default">Download color variant</a>
+
 <script>
 function initGraph(){
   var graphDefinition = generateGraph();
@@ -30,8 +32,32 @@ function initGraph(){
       generateGraphStyles();
     }
   }, 100 );
+
+  var btn = document.querySelector( '#vardownload' );
+  btn.addEventListener('click', getStylesheet);
 };
 
+function download(data, mimetype, filename){
+    // Creating a Blob for having a csv file format
+    // and passing the data with type
+    const blob = new Blob([data], { type: mimetype });
+    // Creating an object for downloading url
+    const url = window.URL.createObjectURL(blob);
+    // Creating an anchor(a) tag of HTML
+    const a = document.createElement('a');
+    // Passing the blob downloading url
+    a.setAttribute('href', url);
+    // Setting the anchor tag attribute for downloading
+    // and passing the download file name
+    a.setAttribute('download', filename);
+    // Performing a download with click
+    a.click();
+}
+
+function getStylesheet(){
+  download( generateStylesheet(), 'text/css', 'theme-' + themename + '.css' );
+}
+
 function adjustCSSRules(selector, props, sheets){
   // get stylesheet(s)
   if (!sheets) sheets = [...document.styleSheets];
@@ -61,6 +87,10 @@ function adjustCSSRules(selector, props, sheets){
   }
 }
 
+function getColorValue( c ){
+  return getComputedStyle( document.documentElement ).getPropertyValue( '--INTERNAL-'+c ).trim();
+}
+
 function changeColor( c ){
   var style = null;
   var theme = getTheme();
@@ -82,7 +112,7 @@ function changeColor( c ){
   }
 
   var r = document.querySelector( ':root' );
-  var v = getComputedStyle( document.documentElement ).getPropertyValue( '--INTERNAL-'+c ).trim();
+  var v = getColorValue( c );
   var n = prompt( '--'+c, v ).trim();
   if( n ){
     r = style.quer
@@ -93,6 +123,15 @@ function changeColor( c ){
   }
 }
 
+function generateStylesheet(){
+  var style =
+    '/* ' + themename + ' */\n' +
+    ':root {\n' +
+      variables.reduce( function( a, e ){ return a + '  --' + e.name + ': ' + getColorValue(e.name) + ';\n'; }, '' ) +
+    '}\n';
+  return style;
+}
+
 function styleGroup( selector, colorvar ){
   adjustCSSRules( '#body svg '+selector+' > rect', 'color: var(--INTERNAL-'+colorvar+'); fill: var(--INTERNAL-'+colorvar+'); stroke: #80808080;' );
   adjustCSSRules( '#body svg '+selector+' > .label .nodeLabel', 'color: var(--INTERNAL-'+colorvar+'); fill: var(--INTERNAL-'+colorvar+'); stroke: #80808080;' );
@@ -173,6 +212,7 @@ function generateGraph(){
   return graph;
 }
 
+var themename = 'my-variant';
 var variables = [
   { name: 'MAIN-TEXT-color',       group: 'content',  default: '#101010' },
   { name: 'MAIN-LINK-color',       group: 'content',  default: '#486ac9' },
diff --git a/layouts/partials/stylesheet.html b/layouts/partials/stylesheet.html
index e1c82690e7..2cb47b0c5f 100644
--- a/layouts/partials/stylesheet.html
+++ b/layouts/partials/stylesheet.html
@@ -36,7 +36,7 @@
         if( !s || !s.match ){
           return '';
         }
-        var matches = s.match(/^.*\/theme-(.*?)\.css.*$/);
+        var matches = s.match(/^.*\/?theme-(.*?)\.css.*$/);
         var theme = matches && matches.length == 2 ? matches[ 1 ] : '';
         return theme;
       }