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134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
package xlsxw
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import (
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"math"
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"time"
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excelize "github.com/xuri/excelize/v2"
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"github.com/neilotoole/sq/libsq/core/errz"
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"github.com/neilotoole/sq/libsq/core/options"
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)
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var (
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// OptDatetimeFormat is Excel's custom datetime format string.
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OptDatetimeFormat = options.NewString(
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"format.excel.datetime",
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"",
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0,
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"yyyy-mm-dd hh:mm",
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func(s string) error {
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err := validateDatetimeFormatString(s)
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return errz.Wrap(err, "config: format.excel.datetime: invalid format string")
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},
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"Timestamp format string for Excel datetime values",
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`Timestamp format for datetime values: that is, for values that have
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both a date and time component. The exact format is specific to
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Microsoft Excel, but is broadly similar to strftime.
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Examples:
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"yyyy-mm-dd hh:mm" 1989-11-09 16:07
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"dd/mm/yy h:mm am/pm" 09/11/89 4:07 pm
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"dd-mmm-yy h:mm:ss AM/PM" 09-Nov-89 4:07:01 PM
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`,
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options.TagOutput,
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)
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// OptDateFormat is Excel's custom date-only format string.
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OptDateFormat = options.NewString(
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"format.excel.date",
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"",
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0,
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"yyyy-mm-dd",
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func(s string) error {
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err := validateDatetimeFormatString(s)
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return errz.Wrap(err, "config: format.excel.date: invalid format string")
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},
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"Date format string for Excel date-only values",
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`Date format string for Microsoft Excel date-only values. The exact format
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is specific to Excel, but is broadly similar to strftime.
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Examples:
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"yyyy-mm-dd" 1989-11-09
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"dd/mm/yy" 09/11/89
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"dd-mmm-yy" 09-Nov-89`,
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options.TagOutput,
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)
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// OptTimeFormat is Excel's custom time format string.
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OptTimeFormat = options.NewString(
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"format.excel.time",
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"",
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0,
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"hh:mm:ss",
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func(s string) error {
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err := validateDatetimeFormatString(s)
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return errz.Wrap(err, "config: format.excel.time: invalid format string")
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},
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"Time format string for Excel time-only values",
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`Time format string for Microsoft Excel time-only values. The exact format is
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specific to Excel, but is broadly similar to strftime.
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Examples:
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"hh:mm:ss" 16:07:10
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"h:mm am/pm" 4:07 pm
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"h:mm:ss AM/PM" 4:07:01 PM
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Note that time-only values are sometimes programmatically indistinguishable
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from datetime values. In that situation, use format.excel.datetime instead.`,
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options.TagOutput,
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)
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)
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func validateDatetimeFormatString(s string) error {
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xl := excelize.NewFile()
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defer func() { _ = xl.Close() }()
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_, err := xl.NewStyle(&excelize.Style{CustomNumFmt: &s})
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return errz.Err(err)
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}
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// timeOnlyToExcelFloat returns a float value for the time-only part
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// of t. This is needed because Excel really prefers that time values
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// are represented as a float.
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//
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// See: https://xuri.me/excelize/en/cell.html#SetCellStyle
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func timeOnlyToExcelFloat(t time.Time) (float64, error) {
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now := time.Now().UTC()
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t2 := time.Date(
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now.Year(),
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now.Month(),
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now.Day(),
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t.Hour(),
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t.Minute(),
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t.Second(),
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t.Nanosecond(),
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now.Location(),
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)
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f, err := timeToExcelTime(t2, false)
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if err != nil {
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return 0, errz.Err(err)
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}
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// We're only interested in the fractional part
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_, f = math.Modf(f)
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return f, nil
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}
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// timeOnlyStringToExcelFloat is a convenience wrapper
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// around timeOnlyToExcelFloat, that handles a time-only string
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// such as "16:07:04".
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func timeOnlyStringToExcelFloat(s string) (float64, error) {
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t, err := time.Parse(time.TimeOnly, s)
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if err != nil {
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return 0, errz.Err(err)
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}
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return timeOnlyToExcelFloat(t)
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}
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