Add sorting functionality

There is a command and config option. The criteria are a list of the
sort criterion and each can be individually reversed.

This only includes support for sorting in the maildir backend currently.
The other backends are not supported in this patch.

1 files changed, 253 insertions, 0 deletions

diff --git a/worker/lib/sort.go b/worker/lib/sort.go
new file mode 100644
index 0000000..36c0924
--- /dev/null
+++ b/worker/lib/sort.go
@@ -0,0 +1,253 @@
+package lib
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+
+	"git.sr.ht/~sircmpwn/aerc/models"
+	"git.sr.ht/~sircmpwn/aerc/worker/types"
+)
+
+func Sort(messageInfos []*models.MessageInfo,
+	criteria []*types.SortCriterion) ([]uint32, error) {
+	// loop through in reverse to ensure we sort by non-primary fields first
+	for i := len(criteria) - 1; i >= 0; i-- {
+		criterion := criteria[i]
+		var err error
+		switch criterion.Field {
+		case types.SortArrival:
+			err = sortDate(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) time.Time {
+					return msgInfo.InternalDate
+				})
+		case types.SortCc:
+			err = sortAddresses(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) []*models.Address {
+					return msgInfo.Envelope.Cc
+				})
+		case types.SortDate:
+			err = sortDate(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) time.Time {
+					return msgInfo.Envelope.Date
+				})
+		case types.SortFrom:
+			err = sortAddresses(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) []*models.Address {
+					return msgInfo.Envelope.From
+				})
+		case types.SortRead:
+			err = sortFlags(messageInfos, criterion, models.SeenFlag)
+		case types.SortSize:
+			err = sortInts(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) uint32 {
+					return msgInfo.Size
+				})
+		case types.SortSubject:
+			err = sortStrings(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) string {
+					subject := strings.ToLower(msgInfo.Envelope.Subject)
+					subject = strings.TrimPrefix(subject, "re: ")
+					return strings.TrimPrefix(subject, "fwd: ")
+				})
+		case types.SortTo:
+			err = sortAddresses(messageInfos, criterion,
+				func(msgInfo *models.MessageInfo) []*models.Address {
+					return msgInfo.Envelope.To
+				})
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+	var uids []uint32
+	// copy in reverse as msgList displays backwards
+	for i := len(messageInfos) - 1; i >= 0; i-- {
+		uids = append(uids, messageInfos[i].Uid)
+	}
+	return uids, nil
+}
+
+func sortDate(messageInfos []*models.MessageInfo, criterion *types.SortCriterion,
+	getValue func(*models.MessageInfo) time.Time) error {
+	var slice []*dateStore
+	for _, msgInfo := range messageInfos {
+		slice = append(slice, &dateStore{
+			Value:   getValue(msgInfo),
+			MsgInfo: msgInfo,
+		})
+	}
+	sortSlice(criterion, dateSlice{slice})
+	for i := 0; i < len(messageInfos); i++ {
+		messageInfos[i] = slice[i].MsgInfo
+	}
+	return nil
+}
+
+func sortAddresses(messageInfos []*models.MessageInfo, criterion *types.SortCriterion,
+	getValue func(*models.MessageInfo) []*models.Address) error {
+	var slice []*addressStore
+	for _, msgInfo := range messageInfos {
+		slice = append(slice, &addressStore{
+			Value:   getValue(msgInfo),
+			MsgInfo: msgInfo,
+		})
+	}
+	sortSlice(criterion, addressSlice{slice})
+	for i := 0; i < len(messageInfos); i++ {
+		messageInfos[i] = slice[i].MsgInfo
+	}
+	return nil
+}
+
+func sortFlags(messageInfos []*models.MessageInfo, criterion *types.SortCriterion,
+	testFlag models.Flag) error {
+	var slice []*boolStore
+	for _, msgInfo := range messageInfos {
+		flagPresent := false
+		for _, flag := range msgInfo.Flags {
+			if flag == testFlag {
+				flagPresent = true
+			}
+		}
+		slice = append(slice, &boolStore{
+			Value:   flagPresent,
+			MsgInfo: msgInfo,
+		})
+	}
+	sortSlice(criterion, boolSlice{slice})
+	for i := 0; i < len(messageInfos); i++ {
+		messageInfos[i] = slice[i].MsgInfo
+	}
+	return nil
+}
+
+func sortInts(messageInfos []*models.MessageInfo, criterion *types.SortCriterion,
+	getValue func(*models.MessageInfo) uint32) error {
+	var slice []*intStore
+	for _, msgInfo := range messageInfos {
+		slice = append(slice, &intStore{
+			Value:   getValue(msgInfo),
+			MsgInfo: msgInfo,
+		})
+	}
+	sortSlice(criterion, intSlice{slice})
+	for i := 0; i < len(messageInfos); i++ {
+		messageInfos[i] = slice[i].MsgInfo
+	}
+	return nil
+}
+
+func sortStrings(messageInfos []*models.MessageInfo, criterion *types.SortCriterion,
+	getValue func(*models.MessageInfo) string) error {
+	var slice []*lexiStore
+	for _, msgInfo := range messageInfos {
+		slice = append(slice, &lexiStore{
+			Value:   getValue(msgInfo),
+			MsgInfo: msgInfo,
+		})
+	}
+	sortSlice(criterion, lexiSlice{slice})
+	for i := 0; i < len(messageInfos); i++ {
+		messageInfos[i] = slice[i].MsgInfo
+	}
+	return nil
+}
+
+type lexiStore struct {
+	Value   string
+	MsgInfo *models.MessageInfo
+}
+
+type lexiSlice struct{ Slice []*lexiStore }
+
+func (s lexiSlice) Len() int      { return len(s.Slice) }
+func (s lexiSlice) Swap(i, j int) { s.Slice[i], s.Slice[j] = s.Slice[j], s.Slice[i] }
+func (s lexiSlice) Less(i, j int) bool {
+	return s.Slice[i].Value < s.Slice[j].Value
+}
+
+type dateStore struct {
+	Value   time.Time
+	MsgInfo *models.MessageInfo
+}
+
+type dateSlice struct{ Slice []*dateStore }
+
+func (s dateSlice) Len() int      { return len(s.Slice) }
+func (s dateSlice) Swap(i, j int) { s.Slice[i], s.Slice[j] = s.Slice[j], s.Slice[i] }
+func (s dateSlice) Less(i, j int) bool {
+	return s.Slice[i].Value.Before(s.Slice[j].Value)
+}
+
+type intStore struct {
+	Value   uint32
+	MsgInfo *models.MessageInfo
+}
+
+type intSlice struct{ Slice []*intStore }
+
+func (s intSlice) Len() int      { return len(s.Slice) }
+func (s intSlice) Swap(i, j int) { s.Slice[i], s.Slice[j] = s.Slice[j], s.Slice[i] }
+func (s intSlice) Less(i, j int) bool {
+	return s.Slice[i].Value < s.Slice[j].Value
+}
+
+type addressStore struct {
+	Value   []*models.Address
+	MsgInfo *models.MessageInfo
+}
+
+type addressSlice struct{ Slice []*addressStore }
+
+func (s addressSlice) Len() int      { return len(s.Slice) }
+func (s addressSlice) Swap(i, j int) { s.Slice[i], s.Slice[j] = s.Slice[j], s.Slice[i] }
+func (s addressSlice) Less(i, j int) bool {
+	addressI, addressJ := s.Slice[i].Value, s.Slice[j].Value
+	var firstI, firstJ *models.Address
+	if len(addressI) > 0 {
+		firstI = addressI[0]
+	}
+	if len(addressJ) > 0 {
+		firstJ = addressJ[0]
+	}
+	if firstI == nil && firstJ == nil {
+		return false
+	} else if firstI == nil && firstJ != nil {
+		return false
+	} else if firstI != nil && firstJ == nil {
+		return true
+	} else /* firstI != nil && firstJ != nil */ {
+		getName := func(addr *models.Address) string {
+			if addr.Name != "" {
+				return addr.Name
+			} else {
+				return fmt.Sprintf("%s@%s", addr.Mailbox, addr.Host)
+			}
+		}
+		return getName(firstI) < getName(firstJ)
+	}
+}
+
+type boolStore struct {
+	Value   bool
+	MsgInfo *models.MessageInfo
+}
+
+type boolSlice struct{ Slice []*boolStore }
+
+func (s boolSlice) Len() int      { return len(s.Slice) }
+func (s boolSlice) Swap(i, j int) { s.Slice[i], s.Slice[j] = s.Slice[j], s.Slice[i] }
+func (s boolSlice) Less(i, j int) bool {
+	valI, valJ := s.Slice[i].Value, s.Slice[j].Value
+	return valI && !valJ
+}
+
+func sortSlice(criterion *types.SortCriterion, interfce sort.Interface) {
+	if criterion.Reverse {
+		sort.Stable(sort.Reverse(interfce))
+	} else {
+		sort.Stable(interfce)
+	}
+}