M git/diff.go

@@ -20,6 +20,7 @@ Old string
 		New string
 	}
 	TextFragments []TextFragment
+	IsBinary      bool
 }
 
 // A nicer git diff representation.
@@ -88,6 +89,7 @@ for _, d := range diffs {
 		ndiff := Diff{}
 		ndiff.Name.New = d.NewName
 		ndiff.Name.Old = d.OldName

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M git/git.go

@@ -76,7 +76,13 @@ if err != nil {
 		return "", err
 	}
 
-	return file.Contents()
+	isbin, _ := file.IsBinary()
+
+	if !isbin {
+		return file.Contents()
+	} else {
+		return "Not displaying binary file", nil

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M templates/commit.html

@@ -55,7 +55,9 @@ {{ else }}
           <a href="/{{ $repo }}/blob/{{ $this }}/{{ .Name.New }}">{{ .Name.New }}</a>
           {{- end -}}
           </div>
-
+          {{ if .IsBinary }}
+          <p>Not showing binary file.</p>
+          {{ else }}
             <pre>
             {{- range .TextFragments -}}
             <p>{{- .Header -}}</p>

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