search: handle date ranges in search/filter query

Handle date ranges in the filter and search commands for searching and
filtering based on the Date: header. Implement a flag (-d) that accepts
a date range <start[..end]> where the start date is included in the
range but the end date is not, i.e. [start,end).

The start or end date can be omitted: "start", "start..", "..end", or
"start..end" are all valid inputs.

An example filter query would look like this: :filter -d 2022-11-09..

The dates should be in the YYYY-MM-DD format.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 55 insertions, 0 deletions

diff --git a/worker/lib/daterange_test.go b/worker/lib/daterange_test.go
new file mode 100644
index 00000000..983f99a0
--- /dev/null
+++ b/worker/lib/daterange_test.go
@@ -0,0 +1,55 @@
+package lib_test
+
+import (
+	"testing"
+	"time"
+
+	"git.sr.ht/~rjarry/aerc/worker/lib"
+)
+
+func TestParseDateRange(t *testing.T) {
+	dateFmt := "2006-01-02"
+	parse := func(s string) time.Time { d, _ := time.Parse(dateFmt, s); return d }
+	tests := []struct {
+		s     string
+		start time.Time
+		end   time.Time
+	}{
+		{
+			s:     "2022-11-01",
+			start: parse("2022-11-01"),
+			end:   parse("2022-11-02"),
+		},
+		{
+			s:     "2022-11-01..",
+			start: parse("2022-11-01"),
+		},
+		{
+			s:   "..2022-11-05",
+			end: parse("2022-11-05"),
+		},
+		{
+			s:     "2022-11-01..2022-11-05",
+			start: parse("2022-11-01"),
+			end:   parse("2022-11-05"),
+		},
+	}
+
+	for _, test := range tests {
+		start, end, err := lib.ParseDateRange(test.s)
+		if err != nil {
+			t.Errorf("ParseDateRange return error for %s: %v",
+				test.s, err)
+		}
+
+		if !start.Equal(test.start) {
+			t.Errorf("wrong start date; expected %v, got %v",
+				test.start, start)
+		}
+
+		if !end.Equal(test.end) {
+			t.Errorf("wrong end date; expected %v, got %v",
+				test.end, end)
+		}
+	}
+}