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/*
* Based on a python package to update windows mappings
* @see https://github.com/regebro/tzlocal/blob/master/update_windows_mappings.py
*/
package tzdata
import (
"bytes"
"fmt"
"io"
"sort"
"strings"
"time"
)
func UpdateWindowsTZMapping(target io.Writer) error {
backward, err := DownloadOldNames()
if err != nil {
return err
}
data, err := DownloadWindowsZones()
if err != nil {
return err
}
win_tz := make(map[string]string)
tz_win := make(map[string]string)
// # UTC is a common but non-standard alias for Etc/UTC:
tz_win["Etc/UTC"] = "UTC"
for _, element := range data.WindowsZones.MapTimezones {
// if element.Type == "windows" {
// break
// }
// Making windows mapping
for _, m := range element.MapZone {
t := strings.Split(m.Type, " ")
if m.Territory == "001" {
win_tz[m.Other] = t[0]
}
for _, tz_name := range t {
tz_win[tz_name] = m.Other
}
}
// Map in the backwards compatible zone names
for backward_compat_name, standard_name := range backward {
if win_zone, ok := tz_win[standard_name]; ok {
tz_win[backward_compat_name] = win_zone
}
}
}
// sort the keys
win_tz_keys := make([]string, 0, len(win_tz))
for k := range win_tz {
win_tz_keys = append(win_tz_keys, k)
}
sort.Strings(win_tz_keys)
tz_win_keys := make([]string, 0, len(tz_win))
for k := range tz_win {
tz_win_keys = append(tz_win_keys, k)
}
sort.Strings(tz_win_keys)
// Generate the code
out := bytes.Buffer{}
out.WriteString("// A lookup table, mapping Windows time zone names to IANA time zone names and vice versa.\n\n")
out.WriteString(fmt.Sprintf("// Last created %v\n\n", time.Now().UTC().Format(time.RFC3339)))
out.WriteString("// WinTZtoIANA maps time zone names used by Windows to those used by IANA\n")
out.WriteString("var WinTZtoIANA = map[string]string{\n")
for _, k := range win_tz_keys {
out.WriteString(fmt.Sprintf("\t\"%v\": \"%v\",\n", k, win_tz[k]))
}
out.WriteString("}\n\n")
out.WriteString("// IANAtoWinTZ maps time zone names used by IANA to those used by Windows\n")
out.WriteString("var IANAtoWinTZ = map[string]string{\n")
for _, k := range tz_win_keys {
out.WriteString(fmt.Sprintf(" \"%v\":\"%v\",\n", k, tz_win[k]))
}
out.WriteString("}\n")
// Write buffered code to target writer
target.Write(out.Bytes())
return nil
}
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