// NewEditor creates an Editor.
func NewEditor(file *os.File, sigs chan os.Signal, ev *eval.Evaler, st *store.Store) *Editor {
seq := -1
if st != nil {
var err error
seq, err = st.NextCmdSeq()
if err != nil {
// TODO(xiaq): Also report the error
seq = -1
}
}
prompt, rprompt := defaultPrompts()
ed := &Editor{
file: file,
writer: newWriter(file),
reader: NewReader(file),
sigs: sigs,
store: st,
evaler: ev,
cmdSeq: seq,
ps1: eval.NewPtrVariableWithValidator(prompt, MustBeFn),
rps1: eval.NewPtrVariableWithValidator(rprompt, MustBeFn),
abbreviations: make(map[string]string),
beforeReadLine: eval.NewPtrVariableWithValidator(
eval.NewList(), eval.IsListOfFnValue),
afterReadLine: eval.NewPtrVariableWithValidator(
eval.NewList(), eval.IsListOfFnValue),
}
ev.Editor = ed
ev.Modules["le"] = makeModule(ed)
return ed
}
func (hv History) IndexOne(idx eval.Value) eval.Value {
hv.mutex.RLock()
defer hv.mutex.RUnlock()
slice, i, j := eval.ParseAndFixListIndex(eval.ToString(idx), hv.Len())
if slice {
cmds, err := hv.st.Cmds(i+1, j+1)
maybeThrow(err)
vs := make([]eval.Value, len(cmds))
for i := range cmds {
vs[i] = eval.String(cmds[i])
}
return eval.NewList(vs...)
}
s, err := hv.st.Cmd(i + 1)
maybeThrow(err)
return eval.String(s)
}