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, 6 insertions, 16 deletions

diff --git a/modules/indexer/code/search.go b/modules/indexer/code/search.go
index ca57b3ff88..29ed416541 100644
--- a/modules/indexer/code/search.go
+++ b/modules/indexer/code/search.go
@@ -6,8 +6,6 @@ package code
 
 import (
 	"bytes"
-	"html"
-	gotemplate "html/template"
 	"strings"
 
 	"code.gitea.io/gitea/modules/highlight"
@@ -23,9 +21,8 @@ type Result struct {
 	UpdatedUnix    timeutil.TimeStamp
 	Language       string
 	Color          string
-	HighlightClass string
 	LineNumbers    []int
-	FormattedLines gotemplate.HTML
+	FormattedLines string
 }
 
 func indices(content string, selectionStartIndex, selectionEndIndex int) (int, int) {
@@ -80,19 +77,13 @@ func searchResult(result *SearchResult, startIndex, endIndex int) (*Result, erro
 			openActiveIndex := util.Max(result.StartIndex-index, 0)
 			closeActiveIndex := util.Min(result.EndIndex-index, len(line))
 			err = writeStrings(&formattedLinesBuffer,
-				`<li>`,
-				html.EscapeString(line[:openActiveIndex]),
-				`<span class='active'>`,
-				html.EscapeString(line[openActiveIndex:closeActiveIndex]),
-				`</span>`,
-				html.EscapeString(line[closeActiveIndex:]),
-				`</li>`,
+				line[:openActiveIndex],
+				line[openActiveIndex:closeActiveIndex],
+				line[closeActiveIndex:],
 			)
 		} else {
 			err = writeStrings(&formattedLinesBuffer,
-				`<li>`,
-				html.EscapeString(line),
-				`</li>`,
+				line,
 			)
 		}
 		if err != nil {
@@ -109,9 +100,8 @@ func searchResult(result *SearchResult, startIndex, endIndex int) (*Result, erro
 		UpdatedUnix:    result.UpdatedUnix,
 		Language:       result.Language,
 		Color:          result.Color,
-		HighlightClass: highlight.FileNameToHighlightClass(result.Filename),
 		LineNumbers:    lineNumbers,
-		FormattedLines: gotemplate.HTML(formattedLinesBuffer.String()),
+		FormattedLines: highlight.Code(result.Filename, formattedLinesBuffer.String()),
 	}, nil
 }