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fuser.go
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fuser.go
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package history
import (
"sync"
)
// Fuser provides a unified view into a shared storage-backed command history
// and per-session history.
type Fuser struct {
store Store
storeUpper int
*sync.RWMutex
// Per-session history.
cmds []string
seqs []int
}
func NewFuser(store Store) (*Fuser, error) {
upper, err := store.NextCmdSeq()
if err != nil {
return nil, err
}
return &Fuser{
store: store,
storeUpper: upper,
RWMutex: &sync.RWMutex{},
}, nil
}
func (f *Fuser) FastForward() error {
f.Lock()
defer f.Unlock()
upper, err := f.store.NextCmdSeq()
if err != nil {
return err
}
f.storeUpper = upper
f.cmds = nil
f.seqs = nil
return nil
}
func (f *Fuser) AddCmd(cmd string) error {
f.Lock()
defer f.Unlock()
seq, err := f.store.AddCmd(cmd)
if err != nil {
return err
}
f.cmds = append(f.cmds, cmd)
f.seqs = append(f.seqs, seq)
return nil
}
func (f *Fuser) AllCmds() ([]string, error) {
f.RLock()
defer f.RUnlock()
cmds, err := f.store.Cmds(0, f.storeUpper)
if err != nil {
return nil, err
}
return append(cmds, f.cmds...), nil
}
func (f *Fuser) SessionCmds() []string {
return f.cmds
}
func (f *Fuser) Walker(prefix string) *Walker {
f.RLock()
defer f.RUnlock()
return NewWalker(f.store, f.storeUpper, f.cmds, f.seqs, prefix)
}