2 files changed, 190 insertions, 0 deletions
diff --git a/modules/markup/csv/csv.go b/modules/markup/csv/csv.go
new file mode 100644
index 0000000..092eec7
--- /dev/null
+++ b/modules/markup/csv/csv.go
@@ -0,0 +1,157 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markup
+
+import (
+	"bufio"
+	"html"
+	"io"
+	"regexp"
+	"strconv"
+
+	"code.gitea.io/gitea/modules/csv"
+	"code.gitea.io/gitea/modules/markup"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/translation"
+	"code.gitea.io/gitea/modules/util"
+)
+
+func init() {
+	markup.RegisterRenderer(Renderer{})
+}
+
+// Renderer implements markup.Renderer for csv files
+type Renderer struct{}
+
+// Name implements markup.Renderer
+func (Renderer) Name() string {
+	return "csv"
+}
+
+// Extensions implements markup.Renderer
+func (Renderer) Extensions() []string {
+	return []string{".csv", ".tsv"}
+}
+
+// SanitizerRules implements markup.Renderer
+func (Renderer) SanitizerRules() []setting.MarkupSanitizerRule {
+	return []setting.MarkupSanitizerRule{
+		{Element: "table", AllowAttr: "class", Regexp: regexp.MustCompile(`^data-table$`)},
+		{Element: "th", AllowAttr: "class", Regexp: regexp.MustCompile(`^line-num$`)},
+		{Element: "td", AllowAttr: "class", Regexp: regexp.MustCompile(`^line-num$`)},
+	}
+}
+
+func writeField(w io.Writer, element, class, field string) error {
+	if _, err := io.WriteString(w, "<"); err != nil {
+		return err
+	}
+	if _, err := io.WriteString(w, element); err != nil {
+		return err
+	}
+	if len(class) > 0 {
+		if _, err := io.WriteString(w, " class=\""); err != nil {
+			return err
+		}
+		if _, err := io.WriteString(w, class); err != nil {
+			return err
+		}
+		if _, err := io.WriteString(w, "\""); err != nil {
+			return err
+		}
+	}
+	if _, err := io.WriteString(w, ">"); err != nil {
+		return err
+	}
+	if _, err := io.WriteString(w, html.EscapeString(field)); err != nil {
+		return err
+	}
+	if _, err := io.WriteString(w, "</"); err != nil {
+		return err
+	}
+	if _, err := io.WriteString(w, element); err != nil {
+		return err
+	}
+	_, err := io.WriteString(w, ">")
+	return err
+}
+
+// Render implements markup.Renderer
+func (r Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.Writer) error {
+	tmpBlock := bufio.NewWriter(output)
+	maxSize := setting.UI.CSV.MaxFileSize
+	maxRows := setting.UI.CSV.MaxRows
+
+	if maxSize != 0 {
+		input = io.LimitReader(input, maxSize+1)
+	}
+
+	rd, err := csv.CreateReaderAndDetermineDelimiter(ctx, input)
+	if err != nil {
+		return err
+	}
+	if _, err := tmpBlock.WriteString(`<table class="data-table">`); err != nil {
+		return err
+	}
+
+	row := 0
+	for {
+		fields, err := rd.Read()
+		if err == io.EOF || (row >= maxRows && maxRows != 0) {
+			break
+		}
+		if err != nil {
+			continue
+		}
+
+		if _, err := tmpBlock.WriteString("<tr>"); err != nil {
+			return err
+		}
+		element := "td"
+		if row == 0 {
+			element = "th"
+		}
+		if err := writeField(tmpBlock, element, "line-num", strconv.Itoa(row+1)); err != nil {
+			return err
+		}
+		for _, field := range fields {
+			if err := writeField(tmpBlock, element, "", field); err != nil {
+				return err
+			}
+		}
+		if _, err := tmpBlock.WriteString("</tr>"); err != nil {
+			return err
+		}
+
+		row++
+	}
+
+	if _, err = tmpBlock.WriteString("</table>"); err != nil {
+		return err
+	}
+
+	// Check if maxRows or maxSize is reached, and if true, warn.
+	if (row >= maxRows && maxRows != 0) || (rd.InputOffset() >= maxSize && maxSize != 0) {
+		warn := `<table class="data-table"><tr><td>`
+		rawLink := ` <a href="` + ctx.Links.RawLink() + `/` + util.PathEscapeSegments(ctx.RelativePath) + `">`
+
+		// Try to get the user translation
+		if locale, ok := ctx.Ctx.Value(translation.ContextKey).(translation.Locale); ok {
+			warn += locale.TrString("repo.file_too_large")
+			rawLink += locale.TrString("repo.file_view_raw")
+		} else {
+			warn += "The file is too large to be shown."
+			rawLink += "View Raw"
+		}
+
+		warn += rawLink + `</a></td></tr></table>`
+
+		// Write the HTML string to the output
+		if _, err := tmpBlock.WriteString(warn); err != nil {
+			return err
+		}
+	}
+
+	return tmpBlock.Flush()
+}
diff --git a/modules/markup/csv/csv_test.go b/modules/markup/csv/csv_test.go
new file mode 100644
index 0000000..383f134
--- /dev/null
+++ b/modules/markup/csv/csv_test.go
@@ -0,0 +1,33 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package markup
+
+import (
+	"strings"
+	"testing"
+
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/markup"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRenderCSV(t *testing.T) {
+	var render Renderer
+	kases := map[string]string{
+		"a":        "<table class=\"data-table\"><tr><th class=\"line-num\">1</th><th>a</th></tr></table>",
+		"1,2":      "<table class=\"data-table\"><tr><th class=\"line-num\">1</th><th>1</th><th>2</th></tr></table>",
+		"1;2\n3;4": "<table class=\"data-table\"><tr><th class=\"line-num\">1</th><th>1</th><th>2</th></tr><tr><td class=\"line-num\">2</td><td>3</td><td>4</td></tr></table>",
+		"<br/>":    "<table class=\"data-table\"><tr><th class=\"line-num\">1</th><th>&lt;br/&gt;</th></tr></table>",
+	}
+
+	for k, v := range kases {
+		var buf strings.Builder
+		err := render.Render(&markup.RenderContext{Ctx: git.DefaultContext},
+			strings.NewReader(k), &buf)
+		require.NoError(t, err)
+		assert.EqualValues(t, v, buf.String())
+	}
+}