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down.go
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down.go
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package app
import (
"fmt"
"io"
"sort"
"strings"
"github.com/DJDNS/go-deje/document"
)
type HashPrefixError struct {
Problem string
Prefix string
Doc *document.Document
}
// Return a sorted list of event hashes for printing.
func (hpe HashPrefixError) GetEventHashesAvailable() []string {
keys := make([]string, len(hpe.Doc.Events))
var i int
for key := range hpe.Doc.Events {
keys[i] = key
i++
}
sort.Strings(keys)
return keys
}
func (hpe HashPrefixError) Error() string {
keys := hpe.GetEventHashesAvailable()
var hash_list string
if len(keys) != 0 {
hash_list = "\t" + strings.Join(keys, "\n\t")
}
return fmt.Sprintf("%s: '%s'\n\nAvailable hashes (%d):\n%s",
hpe.Problem, hpe.Prefix,
len(keys), hash_list,
)
}
func GetEventByPrefix(doc *document.Document, hash_prefix string) (*document.Event, error) {
event, ok := doc.Events[hash_prefix]
if ok {
return event, nil
}
// Not an exact match - do prefix search
found := make([]*document.Event, 0)
for key := range doc.Events {
if strings.HasPrefix(key, hash_prefix) {
found = append(found, doc.Events[key])
}
}
// Determine return value by number of results
if len(found) == 0 {
return nil, HashPrefixError{"No such event", hash_prefix, doc}
} else if len(found) > 1 {
return nil, HashPrefixError{"Ambiguous hash prefix", hash_prefix, doc}
} else {
return found[0], nil
}
}
func DoCommandDown(input io.Reader, output JsonWriter, hash_prefix string) error {
doc := document.NewDocument()
if err := doc.Deserialize(input); err != nil {
return err
}
event, err := GetEventByPrefix(&doc, hash_prefix)
if err != nil {
return err
}
if err = event.Goto(); err != nil {
return err
}
return output.Write(doc.State.Export())
}