more tag helpers.

go.mod

@@ -1,6 +1,6 @@
 module github.com/nbd-wtf/go-nostr
 
-go 1.23.0
+go 1.23.1
 
 require (
 	github.com/bluekeyes/go-gitdiff v0.7.1
@@ -24,10 +24,10 @@ require (
 	github.com/tursodatabase/go-libsql v0.0.0-20240916111504-922dfa87e1e6
 	github.com/tyler-smith/go-bip32 v1.0.0
 	github.com/tyler-smith/go-bip39 v1.1.0
-	golang.org/x/crypto v0.27.0
+	golang.org/x/crypto v0.28.0
 	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0
 	golang.org/x/net v0.21.0
-	golang.org/x/text v0.18.0
+	golang.org/x/text v0.19.0
 	modernc.org/sqlite v1.33.1
 )
 
@@ -57,7 +57,7 @@ require (
 	github.com/tetratelabs/wazero v1.8.0 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
-	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 // indirect
 	modernc.org/libc v1.55.3 // indirect

go.sum

@@ -177,8 +177,8 @@ golang.org/x/crypto v0.0.0-20170613210332-850760c427c5/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.27.0 h1:GXm2NjJrPaiv/h1tb2UH8QfgC/hOf/+z0p6PT8o1w7A=
-golang.org/x/crypto v0.27.0/go.mod h1:1Xngt8kV6Dvbssa53Ziq6Eqn0HqbZi5Z6R0ZpwQzt70=
+golang.org/x/crypto v0.28.0 h1:GBDwsMXVQi34v5CCYUm2jkJvu4cbtru2U4TN2PSyQnw=
+golang.org/x/crypto v0.28.0/go.mod h1:rmgy+3RHxRZMyY0jjAJShp2zgEdOqj2AO7U0pYmeQ7U=
 golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 h1:e66Fs6Z+fZTbFBAxKfP3PALWBtpfqks2bwGcexMxgtk=
 golang.org/x/exp v0.0.0-20240909161429-701f63a606c0/go.mod h1:2TbTHSBQa924w8M6Xs1QcRcFwyucIwBGpK1p2f1YFFY=
 golang.org/x/mod v0.21.0 h1:vvrHzRwRfVKSiLrG+d4FMl/Qi4ukBCE6kZlTUkDYRT0=
@@ -203,13 +203,13 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200814200057-3d37ad5750ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
-golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
-golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
+golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.25.0 h1:oFU9pkj/iJgs+0DT+VMHrx+oBKs/LJMV+Uvg78sl+fE=
 golang.org/x/tools v0.25.0/go.mod h1:/vtpO8WL1N9cQC3FN5zPqb//fRXskFHbLKk4OW1Q7rg=

tag_test.go

@@ -21,8 +21,18 @@ func TestTagHelpers(t *testing.T) {
 	assert.NotNil(t, tags.GetFirst([]string{"p", "abcdef", ""}), "failed to get with existing prefix (blank last string)")
 	assert.Equal(t, "ffffff", (*(tags.GetLast([]string{"e"})))[1], "failed to get last")
 	assert.Equal(t, 2, len(tags.GetAll([]string{"e", ""})), "failed to get all")
+	c := make(Tags, 0, 2)
+	for _, tag := range tags.All([]string{"e", ""}) {
+		c = append(c, tag)
+	}
+	assert.Equal(t, tags.GetAll([]string{"e", ""}), c)
 	assert.Equal(t, 5, len(tags.AppendUnique(Tag{"e", "ffffff"})), "append unique changed the array size when existed")
 	assert.Equal(t, 6, len(tags.AppendUnique(Tag{"e", "bbbbbb"})), "append unique failed to append when didn't exist")
 	assert.Equal(t, "ffffff", tags.AppendUnique(Tag{"e", "eeeeee"})[4][1], "append unique changed the order")
 	assert.Equal(t, "eeeeee", tags.AppendUnique(Tag{"e", "eeeeee"})[3][1], "append unique changed the order")
+
+	filtered := tags.FilterOut([]string{"e"})
+	tags.FilterOutInPlace([]string{"e"})
+	assert.ElementsMatch(t, filtered, tags)
+	assert.Len(t, filtered, 3)
 }

tags.go

@@ -3,9 +3,9 @@ package nostr
 import (
 	"encoding/json"
 	"errors"
-	"strings"
-
+	"iter"
 	"slices"
+	"strings"
 )
 
 type Tag []string
@@ -103,7 +103,20 @@ func (tags Tags) GetAll(tagPrefix []string) Tags {
 	return result
 }
 
-// FilterOut removes all tags that match the prefix, see [Tag.StartsWith]
+// All returns an iterator for all the tags that match the prefix, see [Tag.StartsWith]
+func (tags Tags) All(tagPrefix []string) iter.Seq2[int, Tag] {
+	return func(yield func(int, Tag) bool) {
+		for i, v := range tags {
+			if v.StartsWith(tagPrefix) {
+				if !yield(i, v) {
+					break
+				}
+			}
+		}
+	}
+}
+
+// FilterOut returns a new slice with only the elements that match the prefix, see [Tag.StartsWith]
 func (tags Tags) FilterOut(tagPrefix []string) Tags {
 	filtered := make(Tags, 0, len(tags))
 	for _, v := range tags {
@@ -114,6 +127,20 @@ func (tags Tags) FilterOut(tagPrefix []string) Tags {
 	return filtered
 }
 
+// FilterOutInPlace removes all tags that match the prefix, but potentially reorders the tags in unpredictable ways, see [Tag.StartsWith]
+func (tags *Tags) FilterOutInPlace(tagPrefix []string) {
+	for i := 0; i < len(*tags); i++ {
+		tag := (*tags)[i]
+		if tag.StartsWith(tagPrefix) {
+			// remove this by swapping the last tag into this place
+			last := len(*tags) - 1
+			(*tags)[i] = (*tags)[last]
+			*tags = (*tags)[0:last]
+			i-- // this is so we can match this just swapped item in the next iteration
+		}
+	}
+}
+
 // AppendUnique appends a tag if it doesn't exist yet, otherwise does nothing.
 // the uniqueness comparison is done based only on the first 2 elements of the tag.
 func (tags Tags) AppendUnique(tag Tag) Tags {