opentimestamps: add help text.

format/opentimestamps/opentimestamps.go

@@ -3,6 +3,8 @@ package opentimestamps
 // https://opentimestamps.org/
 
 import (
+	"embed"
+
 	"github.com/wader/fq/format"
 	"github.com/wader/fq/pkg/decode"
 	"github.com/wader/fq/pkg/interp"
@@ -10,6 +12,9 @@ import (
 	"golang.org/x/exp/slices"
 )
 
+//go:embed opentimestamps.md
+var otsFS embed.FS
+
 func init() {
 	interp.RegisterFormat(
 		format.Opentimestamps,
@@ -18,6 +23,7 @@ func init() {
 			DecodeFn:    decodeOTSFile,
 			Groups:      []*decode.Group{format.Probe},
 		})
+	interp.RegisterFS(otsFS)
 }
 
 const (

format/opentimestamps/opentimestamps.md

@@ -0,0 +1,24 @@
+### View a full OpenTimestamps file
+
+```
+$ fq dd file.ots
+```
+
+### List the names of the Calendar servers used
+
+```
+$ fq '.operations | map(select(.attestation_type == "calendar") | .url)' file.ots
+```
+
+### Check if there are Bitcoin attestations present
+
+```
+$ fq '.operations | map(select(.attestation_type == "bitcoin")) | length > 0' file.ots
+```
+
+### Authors
+- fiatjaf, https://fiatjaf.com
+
+### References
+- https://opentimestamps.org/
+- https://github.com/opentimestamps/python-opentimestamps