From 577d5bf8fe51add28ad8ec1e3e740ca9d9567886 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Mon, 18 Dec 2017 09:46:11 -0800
Subject: [PATCH 1/2] include all hashes in algorithms list

alternative to #54
---
 opts/opts.go | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/opts/opts.go b/opts/opts.go
index c905c9b..3f6c4f1 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"sort"
 	"strings"
 
 	mh "github.com/multiformats/go-multihash"
@@ -34,8 +35,15 @@ var FlagValues = struct {
 	Encodings  []string
 	Algorithms []string
 }{
-	Encodings:  []string{"raw", "hex", "base58", "base64"},
-	Algorithms: []string{"sha1", "sha2-256", "sha2-512", "sha3"},
+	Encodings: []string{"raw", "hex", "base58", "base64"},
+	Algorithms: func() []string {
+		names := make([]string, 0, len(mh.Names))
+		for n := range mh.Names {
+			names = append(names, n)
+		}
+		sort.Strings(names)
+		return names
+	}(),
 }
 
 // SetupFlags adds multihash related options to given flagset.

From c20bae2d9f1f1428b4dafe14b0db546a0c5f43e4 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Thu, 23 Aug 2018 19:10:29 -0700
Subject: [PATCH 2/2] cmd: filter out less-useful and non-implemented blake2
 hash functions

---
 opts/opts.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/opts/opts.go b/opts/opts.go
index 3f6c4f1..745c83f 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -39,6 +39,20 @@ var FlagValues = struct {
 	Algorithms: func() []string {
 		names := make([]string, 0, len(mh.Names))
 		for n := range mh.Names {
+			// There are too many of these for now.
+			// We can figure something better out later.
+			if strings.HasPrefix(n, "blake2") {
+				switch n {
+				case "blake2s-256":
+				case "blake2b-128":
+				case "blake2b-224":
+				case "blake2b-256":
+				case "blake2b-384":
+				case "blake2b-512":
+				default:
+					continue
+				}
+			}
 			names = append(names, n)
 		}
 		sort.Strings(names)