dashboard/app: use 12-char hash in Fixes tags

@ebiggers pointed out that Fixes tags should use 12-char hash:
https://groups.google.com/d/msg/syzkaller-bugs/yUhRrLD6T6A/3TMwOWvWAgAJ
I can't find any documentation on this, but it looks like most
existing tags follow this convention so use 12-char hashes.

1 files changed, 10 insertions, 0 deletions

diff --git a/pkg/html/html.go b/pkg/html/html.go
index a07de81d2..1c48f6d51 100644
--- a/pkg/html/html.go
+++ b/pkg/html/html.go
@@ -47,6 +47,7 @@ var Funcs = template.FuncMap{
 	"formatReproLevel":       formatReproLevel,
 	"formatStat":             formatStat,
 	"formatShortHash":        formatShortHash,
+	"formatTagHash":          formatTagHash,
 	"formatCommitTableTitle": formatCommitTableTitle,
 	"formatList":             formatStringList,
 }
@@ -142,6 +143,15 @@ func formatShortHash(v string) string {
 	return v[:hashLen]
 }
 
+func formatTagHash(v string) string {
+	// Note: Fixes/References commit tags should include 12-char hash. Don't change this const.
+	const hashLen = 12
+	if len(v) <= hashLen {
+		return v
+	}
+	return v[:hashLen]
+}
+
 func formatCommitTableTitle(v string) string {
 	// This function is very specific to how we format tables in text emails.
 	// Truncate commit title so that whole line fits into 78 chars.