Server-side syntax highlighting for all code (#12047)

* Server-side syntax hilighting for all code

This PR does a few things:

* Remove all traces of highlight.js
* Use chroma library to provide fast syntax hilighting directly on the server
* Provide syntax hilighting for diffs
* Re-style both unified and split diffs views
* Add custom syntax hilighting styling for both regular and arc-green

Fixes #7729
Fixes #10157
Fixes #11825
Fixes #7728
Fixes #3872
Fixes #3682

And perhaps gets closer to #9553

* fix line marker

* fix repo search

* Fix single line select

* properly load settings

* npm uninstall highlight.js

* review suggestion

* code review

* forgot to call function

* fix test

* Apply suggestions from code review

suggestions from @silverwind thanks

Co-authored-by: silverwind <me@silverwind.io>

* code review

* copy/paste error

* Use const for highlight size limit

* Update web_src/less/_repository.less

Co-authored-by: Lauris BH <lauris@nix.lv>

* update size limit to 1MB and other styling tweaks

* fix highlighting for certain diff sections

* fix test

* add worker back as suggested

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lauris BH <lauris@nix.lv>

1 files changed, 4 insertions, 4 deletions

diff --git a/templates/repo/diff/blob_excerpt.tmpl b/templates/repo/diff/blob_excerpt.tmpl
index cff5e6385d..f1fb9a0557 100644
--- a/templates/repo/diff/blob_excerpt.tmpl
+++ b/templates/repo/diff/blob_excerpt.tmpl
@@ -13,14 +13,14 @@
       <span class="ui blob-excerpt" data-url="{{$.RepoLink}}/blob_excerpt/{{$.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=" data-anchor="{{$.Anchor}}">{{svg "octicon-fold" 16}}</span>
       {{end}}
     </td>
-    <td colspan="5" class="lines-code lines-code-old "><span class="mono wrap{{if $.highlightClass}} language-{{$.highlightClass}}{{else}} nohighlight{{end}}">{{$.section.GetComputedInlineDiffFor $line}}</span></td>
+    <td colspan="5" class="lines-code lines-code-old "><span class="mono wrap">{{$.section.GetComputedInlineDiffFor $line}}</span></td>
     {{else}}
     <td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}"><span rel="{{if $line.LeftIdx}}diff-{{Sha1 $.fileName}}L{{$line.LeftIdx}}{{end}}"></span></td>
     <td class="blob-excerpt lines-type-marker lines-type-marker-old">{{if $line.LeftIdx}}<span class="mono" data-type-marker=""></span>{{end}}</td>
-    <td class="blob-excerpt lines-code lines-code-old halfwidth"><span class="mono wrap{{if $.highlightClass}} language-{{$.highlightClass}}{{else}} nohighlight{{end}}">{{if $line.LeftIdx}}{{$.section.GetComputedInlineDiffFor $line}}{{end}}</span></td>
+    <td class="blob-excerpt lines-code lines-code-old halfwidth"><span class="mono wrap">{{if $line.LeftIdx}}{{$.section.GetComputedInlineDiffFor $line}}{{end}}</span></td>
     <td class="lines-num lines-num-new" data-line-num="{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}"><span rel="{{if $line.RightIdx}}diff-{{Sha1 $.fileName}}R{{$line.RightIdx}}{{end}}"></span></td>
     <td class="blob-excerpt lines-type-marker lines-type-marker-new">{{if $line.RightIdx}}<span class="mono" data-type-marker=""></span>{{end}}</td>
-    <td class="blob-excerpt lines-code lines-code-new halfwidth"><span class="mono wrap{{if $.highlightClass}} language-{{$.highlightClass}}{{else}} nohighlight{{end}}">{{if $line.RightIdx}}{{$.section.GetComputedInlineDiffFor $line}}{{end}}</span></td>
+    <td class="blob-excerpt lines-code lines-code-new halfwidth"><span class="mono wrap">{{if $line.RightIdx}}{{$.section.GetComputedInlineDiffFor $line}}{{end}}</span></td>
     {{end}}
   </tr>
   {{end}}
@@ -44,7 +44,7 @@
     <td class="lines-num lines-num-new" data-line-num="{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}"><span rel="{{if $line.RightIdx}}diff-{{Sha1 $.fileName}}R{{$line.RightIdx}}{{end}}"></span></td>
     {{end}}
     <td class="blob-excerpt lines-type-marker"><span class="mono" data-type-marker="{{$line.GetLineTypeMarker}}"></span></td>
-    <td class="blob-excerpt lines-code{{if (not $line.RightIdx)}} lines-code-old{{end}}"><span class="mono wrap{{if $.highlightClass}} language-{{$.highlightClass}}{{else}} nohighlight{{end}}">{{$.section.GetComputedInlineDiffFor $line}}</span></td>
+    <td class="blob-excerpt lines-code{{if (not $line.RightIdx)}} lines-code-old{{end}}"><span class="mono wrap">{{$.section.GetComputedInlineDiffFor $line}}</span></td>
   </tr>
   {{end}}
 {{end}}