package sort
import (
"errors"
"fmt"
"sort"
"strings"
"git.sr.ht/~sircmpwn/aerc/worker/types"
)
func GetSortCriteria(args []string) ([]*types.SortCriterion, error) {
var sortCriteria []*types.SortCriterion
reverse := false
for _, arg := range args {
if arg == "-r" {
reverse = true
continue
}
field, err := parseSortField(arg)
if err != nil {
return nil, err
}
sortCriteria = append(sortCriteria, &types.SortCriterion{
Field: field,
Reverse: reverse,
})
reverse = false
}
if reverse {
return nil, errors.New("Expected argument to reverse")
}
return sortCriteria, nil
}
func parseSortField(arg string) (types.SortField, error) {
switch strings.ToLower(arg) {
case "arrival":
return types.SortArrival, nil
case "cc":
return types.SortCc, nil
case "date":
return types.SortDate, nil
case "from":
return types.SortFrom, nil
case "read":
return types.SortRead, nil
case "size":
return types.SortSize, nil
case "subject":
return types.SortSubject, nil
case "to":
return types.SortTo, nil
default:
return types.SortArrival, fmt.Errorf("%v is not a valid sort criterion", arg)
}
}
// Sorts toSort by sortBy so that toSort becomes a permutation following the
// order of sortBy.
// toSort should be a subset of sortBy
func SortBy(toSort []uint32, sortBy []uint32) {
// build a map from sortBy
uidMap := make(map[uint32]int)
for i, uid := range sortBy {
uidMap[uid] = i
}
// sortslice of toSort with less function of indexing the map sortBy
sort.Slice(toSort, func(i, j int) bool {
return uidMap[toSort[i]] < uidMap[toSort[j]]
})
}