csvtk round: fix bug of failing to round scientific notation with val…

…ue small than one

CHANGES.md

@@ -8,6 +8,7 @@
     - new command: `csvtk unfold` for unfolding multiple values in cells of a field. [#103](https://github.com/shenwei356/csvtk/issues/103)
     - rename `csvtk collapse` to `csvtk fold`, for folding multiple values of a field into cells of groups.
     - `csvtk cut`: **support range format `2-` to choose 2nd column to the end**. [#106](https://github.com/shenwei356/csvtk/issues/106)
+    - `csvtk round`: fix bug of failing to round scientific notation with value small than one, e.g., `7.1E-1`.
 - [csvtk v0.21.0](https://github.com/shenwei356/csvtk/releases/tag/v0.21.0)
 [![Github Releases (by Release)](https://img.shields.io/github/downloads/shenwei356/csvtk/v0.21.0/total.svg)](https://github.com/shenwei356/csvtk/releases/tag/v0.21.0)
     - new command: `csvtk nrow/ncol` for printing number of rows or columns.

csvtk/cmd/round.go

@@ -26,6 +26,7 @@ import (
 	"regexp"
 	"runtime"
 	"strconv"
+	"strings"
 
 	"github.com/shenwei356/xopen"
 	"github.com/spf13/cobra"
@@ -220,6 +221,9 @@ var roundCmd = &cobra.Command{
 									record2[f] = fmt.Sprintf(decimalFormat, fvalue)
 								} else if found[1] == "" {
 
+								} else if strings.IndexByte(found[2], '-') > 0 { // scientific notation with value < 1
+									fvalue, _ = strconv.ParseFloat(record2[f], 10)
+									record2[f] = fmt.Sprintf(decimalFormat, fvalue)
 								} else {
 									fvalue, _ = strconv.ParseFloat(found[1], 10)
 									record2[f] = fmt.Sprintf(decimalFormat, fvalue) + found[2]

doc/docs/download.md

@@ -15,6 +15,7 @@
     - new command: `csvtk unfold` for unfolding multiple values in cells of a field. [#103](https://github.com/shenwei356/csvtk/issues/103)
     - rename `csvtk collapse` to `csvtk fold`, for folding multiple values of a field into cells of groups.
     - `csvtk cut`: **support range format `2-` to choose 2nd column to the end**. [#106](https://github.com/shenwei356/csvtk/issues/106)
+    - `csvtk round`: fix bug of failing to round scientific notation with value small than one, e.g., `7.1E-1`.
 
 Links: