diff --git a/app/controller/cutil/formatter.go b/app/controller/cutil/formatter.go
index 0389185..b795677 100644
--- a/app/controller/cutil/formatter.go
+++ b/app/controller/cutil/formatter.go
@@ -3,6 +3,7 @@ package cutil
 import (
 	"fmt"
 	h "html"
+	"regexp"
 	"strings"
 
 	"github.com/alecthomas/chroma"
@@ -19,24 +20,32 @@ var (
 	noLineNums *html.Formatter
 )
 
-func FormatJSON(v any) (string, error) {
-	return FormatLang(util.ToJSON(v), util.KeyJSON)
+func FormatJSON(v any, lineNumLinkAndTitle ...string) (string, error) {
+	return FormatLang(util.ToJSON(v), util.KeyJSON, lineNumLinkAndTitle...)
 }
 
-func FormatLang(content string, lang string) (string, error) {
+func FormatLang(content string, lang string, lineNumLinkAndTitle ...string) (string, error) {
 	l := lexers.Get(lang)
-	return FormatString(content, l)
+	return FormatString(content, l, lineNumLinkAndTitle...)
 }
 
-func FormatFilename(content string, filename string) (string, error) {
+func FormatLangIgnoreErrors(content string, lang string, lineNumLinkAndTitle ...string) string {
+	ret, err := FormatLang(content, lang, lineNumLinkAndTitle...)
+	if err != nil {
+		return fmt.Sprintf("encoding error: %s\n%s", err.Error(), content)
+	}
+	return ret
+}
+
+func FormatFilename(content string, filename string, lineNumLinkAndTitle ...string) (string, error) {
 	l := lexers.Match(filename)
 	if l == nil {
 		l = lexers.Fallback
 	}
-	return FormatString(content, l)
+	return FormatString(content, l, lineNumLinkAndTitle...)
 }
 
-func FormatString(content string, l chroma.Lexer) (string, error) {
+func FormatString(content string, l chroma.Lexer, lineNumLinkAndTitle ...string) (string, error) {
 	if l == nil {
 		return "", errors.New("no lexer available for this content")
 	}
@@ -71,10 +80,37 @@ func FormatString(content string, l chroma.Lexer) (string, error) {
 	if l.Config().Name == "SQL" {
 		ret = strings.ReplaceAll(ret, `<span class="err">$</span>`, `<span class="mi">$</span>`)
 	}
+	if len(lineNumLinkAndTitle) > 0 {
+		title := ""
+		if len(lineNumLinkAndTitle) > 1 {
+			title = lineNumLinkAndTitle[1]
+		}
+		ret = injectLinks(ret, lineNumLinkAndTitle[0], title)
+	}
 	ret = strings.Replace(ret, `<td class="lntd"><pre tabindex="0" class="chroma"><span class="lnt">1<br /></span></pre></td>`, "", 1)
 	return ret, nil
 }
 
+var injectLinksRegex = regexp.MustCompile(`<span class="lnt">(.*?)</span>`)
+
+func injectLinks(ret string, url string, title string) string {
+	return injectLinksRegex.ReplaceAllStringFunc(ret, func(match string) string {
+		content := injectLinksRegex.FindStringSubmatch(match)[1]
+		var num int
+		for _, x := range strings.TrimSpace(content) {
+			if x >= '0' && x <= '9' {
+				num = num*10 + int(x-'0')
+			} else {
+				break
+			}
+		}
+		u := strings.ReplaceAll(url, "{}", fmt.Sprint(num))
+		t := strings.ReplaceAll(title, "{}", fmt.Sprint(num))
+		anchor := fmt.Sprintf(`<a target="_blank" rel="noopener noreferrer" title=%q href=%q>`, t, u)
+		return strings.Replace(match, content, anchor+content+"</a>", 1)
+	})
+}
+
 func FormatMarkdown(s string) (string, error) {
 	match, end := "<pre><code class=\"language-", "</code></pre>"
 	idx := strings.Index(s, match)
diff --git a/views/vfile/Detail.html b/views/vfile/Detail.html
index 16f3060..a3aae4e 100644
--- a/views/vfile/Detail.html
+++ b/views/vfile/Detail.html
@@ -9,7 +9,7 @@
   "github.com/kyleu/npn/app/util"
 ) %}
 
-{% func Detail(path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState) %}
+{% func Detail(path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState, lineNumLinkAndTitle ...string) %}
   {%- if additionalLinks != nil && len(additionalLinks) > 0 -%}
   <div class="right">
     {%- for k, v := range additionalLinks -%}
@@ -25,7 +25,7 @@ <h3>
     {%- if len(b) > (1024 * 128) -%}
     <em>File is {%d len(b) %} bytes, which is too large for the file viewer</em>
     {%- elseif utf8.Valid(b) -%}
-    {%- code out, _ := cutil.FormatFilename(string(b), path[len(path)-1]) -%}
+    {%- code out, _ := cutil.FormatFilename(string(b), path[len(path)-1], lineNumLinkAndTitle...) -%}
     {%s= out %}
     {%- else -%}
 
diff --git a/views/vfile/Detail.html.go b/views/vfile/Detail.html.go
index a9268ca..ed7f17b 100644
--- a/views/vfile/Detail.html.go
+++ b/views/vfile/Detail.html.go
@@ -30,7 +30,7 @@ var (
 )
 
 //line views/vfile/Detail.html:12
-func StreamDetail(qw422016 *qt422016.Writer, path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState) {
+func StreamDetail(qw422016 *qt422016.Writer, path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState, lineNumLinkAndTitle ...string) {
 //line views/vfile/Detail.html:12
 	qw422016.N().S(`
 `)
@@ -101,7 +101,7 @@ func StreamDetail(qw422016 *qt422016.Writer, path []string, b []byte, urlPrefix
 //line views/vfile/Detail.html:27
 	} else if utf8.Valid(b) {
 //line views/vfile/Detail.html:28
-		out, _ := cutil.FormatFilename(string(b), path[len(path)-1])
+		out, _ := cutil.FormatFilename(string(b), path[len(path)-1], lineNumLinkAndTitle...)
 
 //line views/vfile/Detail.html:28
 		qw422016.N().S(`    `)
@@ -193,22 +193,22 @@ func StreamDetail(qw422016 *qt422016.Writer, path []string, b []byte, urlPrefix
 }
 
 //line views/vfile/Detail.html:62
-func WriteDetail(qq422016 qtio422016.Writer, path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState) {
+func WriteDetail(qq422016 qtio422016.Writer, path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState, lineNumLinkAndTitle ...string) {
 //line views/vfile/Detail.html:62
 	qw422016 := qt422016.AcquireWriter(qq422016)
 //line views/vfile/Detail.html:62
-	StreamDetail(qw422016, path, b, urlPrefix, additionalLinks, as, ps)
+	StreamDetail(qw422016, path, b, urlPrefix, additionalLinks, as, ps, lineNumLinkAndTitle...)
 //line views/vfile/Detail.html:62
 	qt422016.ReleaseWriter(qw422016)
 //line views/vfile/Detail.html:62
 }
 
 //line views/vfile/Detail.html:62
-func Detail(path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState) string {
+func Detail(path []string, b []byte, urlPrefix string, additionalLinks map[string]string, as *app.State, ps *cutil.PageState, lineNumLinkAndTitle ...string) string {
 //line views/vfile/Detail.html:62
 	qb422016 := qt422016.AcquireByteBuffer()
 //line views/vfile/Detail.html:62
-	WriteDetail(qb422016, path, b, urlPrefix, additionalLinks, as, ps)
+	WriteDetail(qb422016, path, b, urlPrefix, additionalLinks, as, ps, lineNumLinkAndTitle...)
 //line views/vfile/Detail.html:62
 	qs422016 := string(qb422016.B)
 //line views/vfile/Detail.html:62