Add support for rendering terminal output with colors (#19497)

modules/markup/console/console.go

@@ -0,0 +1,95 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package console
+
+import (
+	"bytes"
+	"io"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"code.gitea.io/gitea/modules/markup"
+	"code.gitea.io/gitea/modules/setting"
+
+	trend "github.com/buildkite/terminal-to-html/v3"
+	"github.com/go-enry/go-enry/v2"
+)
+
+// MarkupName describes markup's name
+var MarkupName = "console"
+
+func init() {
+	markup.RegisterRenderer(Renderer{})
+}
+
+// Renderer implements markup.Renderer
+type Renderer struct{}
+
+// Name implements markup.Renderer
+func (Renderer) Name() string {
+	return MarkupName
+}
+
+// NeedPostProcess implements markup.Renderer
+func (Renderer) NeedPostProcess() bool { return false }
+
+// Extensions implements markup.Renderer
+func (Renderer) Extensions() []string {
+	return []string{".sh-session"}
+}
+
+// SanitizerRules implements markup.Renderer
+func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
+	return []setting.MarkupSanitizerRule{
+		{Element: "span", AllowAttr: "class", Regexp: regexp.MustCompile(`^term-((fg[ix]?|bg)\d+|container)$`)},
+	}
+}
+
+// SanitizerDisabled disabled sanitize if return true
+func (Renderer) SanitizerDisabled() bool {
+	return false
+}
+
+// CanRender implements markup.RendererContentDetector
+func (Renderer) CanRender(filename string, input io.Reader) bool {
+	buf, err := io.ReadAll(input)
+	if err != nil {
+		return false
+	}
+	if enry.GetLanguage(filepath.Base(filename), buf) != enry.OtherLanguage {
+		return false
+	}
+	return bytes.ContainsRune(buf, '\x1b')
+}
+
+// Render renders terminal colors to HTML with all specific handling stuff.
+func (Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
+	buf, err := io.ReadAll(input)
+	if err != nil {
+		return err
+	}
+	buf = trend.Render(buf)
+	buf = bytes.ReplaceAll(buf, []byte("\n"), []byte(`<br>`))
+	_, err = output.Write(buf)
+	return err
+}
+
+// Render renders terminal colors to HTML with all specific handling stuff.
+func Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
+	if ctx.Type == "" {
+		ctx.Type = MarkupName
+	}
+	return markup.Render(ctx, input, output)
+}
+
+// RenderString renders terminal colors in string to HTML with all specific handling stuff and return string
+func RenderString(ctx *markup.RenderContext, content string) (string, error) {
+	var buf strings.Builder
+	if err := Render(ctx, strings.NewReader(content), &buf); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}