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add-header.go
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add-header.go
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// Copyright © 2016-2021 Wei Shen <shenwei356@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package cmd
import (
"encoding/csv"
"fmt"
"runtime"
"github.com/shenwei356/xopen"
"github.com/spf13/cobra"
)
// addHeaderCmd represents the addHeader command
var addHeaderCmd = &cobra.Command{
Use: "add-header",
Short: "add column names",
Long: `add column names
`,
Run: func(cmd *cobra.Command, args []string) {
config := getConfigs(cmd)
files := getFileListFromArgsAndFile(cmd, args, true, "infile-list", true)
runtime.GOMAXPROCS(config.NumCPUs)
colnames := getFlagStringSlice(cmd, "names")
if len(colnames) == 0 {
log.Warningf("colnames not given, c1, c2, c3... will be used")
}
outfh, err := xopen.Wopen(config.OutFile)
checkError(err)
defer outfh.Close()
writer := csv.NewWriter(outfh)
if config.OutTabs || config.Tabs {
if config.OutDelimiter == ',' {
writer.Comma = '\t'
} else {
writer.Comma = config.OutDelimiter
}
} else {
writer.Comma = config.OutDelimiter
}
printMetaLine := true
printHeaderRow := true
for _, file := range files {
csvReader, err := newCSVReaderByConfig(config, file)
if err != nil {
if err == xopen.ErrNoContent {
log.Warningf("csvtk add-header: skipping empty input file: %s", file)
continue
}
checkError(err)
}
csvReader.Run()
for chunk := range csvReader.Ch {
checkError(chunk.Err)
if printMetaLine && len(csvReader.MetaLine) > 0 {
outfh.WriteString(fmt.Sprintf("sep=%s\n", string(writer.Comma)))
printMetaLine = false
}
for _, record := range chunk.Data {
if printHeaderRow {
if len(colnames) == 0 {
colnames = make([]string, len(record))
for i := 0; i < len(record); i++ {
colnames[i] = fmt.Sprintf("c%d", i+1)
}
} else if len(colnames) != len(record) {
checkError(fmt.Errorf("number of fields (%d) and new colnames (%d) do not match", len(record), len(colnames)))
}
checkError(writer.Write(colnames))
printHeaderRow = false
}
checkError(writer.Write(record))
}
}
readerReport(&config, csvReader, file)
}
if printHeaderRow { // did not print rowname
checkError(writer.Write(colnames))
}
writer.Flush()
checkError(writer.Error())
},
}
func init() {
RootCmd.AddCommand(addHeaderCmd)
addHeaderCmd.Flags().StringSliceP("names", "n", []string{}, `column names to add, in CSV format`)
}