added csv2tab cli

Author: rsdoiel

cmd/csv2tab/csv2tab.go

@@ -0,0 +1,124 @@
+// tabs2csv converts a tab delimited file to a CSV formatted file.
+//
+// @author R. S. Doiel, <[email protected]>
+package main
+
+import (
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path"
+
+	// Caltech Library Packages
+	"github.com/caltechlibrary/datatools"
+)
+
+var (
+	description = `
+USAGE
+
+%s is a simple conversion utility to convert from CSV to tab separated values.
+%s reads from standard input and writes to standard out.
+
+`
+
+	examples = `
+If my.tab contained
+
+    "name","email","age"
+	"Doe, Jane","[email protected]",42
+
+Concert this to a tab separated values
+
+    %s < my.csv 
+
+This would yield
+
+    name	email	age
+	Doe, Jane	[email protected]	42
+
+`
+
+	// Standard Options
+	showHelp    bool
+	showLicense bool
+	showVersion bool
+
+	// CSV Reader Options
+	lazyQuotes       bool
+	trimLeadingSpace bool
+	reuseRecord      bool
+	fieldsPerRecord  int
+)
+
+func main() {
+	appName := path.Base(os.Args[0])
+
+	flag.BoolVar(&showHelp, "h", false, "display help")
+	flag.BoolVar(&showHelp, "help", false, "display help")
+	flag.BoolVar(&showLicense, "license", false, "display license")
+	flag.BoolVar(&showVersion, "version", false, "display version")
+
+	// CSV Reader options
+	flag.IntVar(&fieldsPerRecord, "fields-per-record", 0, "sets the number o fields expected in each row, -1 turns this off")
+	flag.BoolVar(&lazyQuotes, "use-lazy-quotes", false, "use lazy quoting for reader")
+	flag.BoolVar(&trimLeadingSpace, "trim-leading-space", false, "trims leading space read")
+	flag.BoolVar(&reuseRecord, "reuse-record", false, "re-uses the backing array on reader")
+
+	// Parse Environment and Options
+	flag.Parse()
+
+	if showHelp {
+		fmt.Fprintf(os.Stdout, description, appName, appName)
+		fmt.Fprintf(os.Stdout, examples, appName)
+		os.Exit(0)
+	}
+	if showLicense {
+		fmt.Fprintln(os.Stdout, datatools.LicenseText, appName, datatools.Version)
+		os.Exit(0)
+	}
+	if showVersion {
+		fmt.Fprintln(os.Stdout, datatools.Version)
+		os.Exit(0)
+	}
+
+	// Setup the CSV output
+	r := csv.NewReader(os.Stdin)
+	r.Comma = ','
+	r.Comment = '#'
+	r.FieldsPerRecord = fieldsPerRecord
+	r.LazyQuotes = lazyQuotes
+	r.TrimLeadingSpace = trimLeadingSpace
+	r.ReuseRecord = reuseRecord
+
+	exitCode := 0
+	w := csv.NewWriter(os.Stdout)
+	w.Comma = '\t'
+	/*
+		if delimiter != "" {
+			w.Comma = datatools.NormalizeDelimiterRune(delimiter)
+		}
+	*/
+	for {
+		row, err := r.Read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			exitCode = 1
+		} else {
+			if err := w.Write(row); err != nil {
+				fmt.Fprintln(os.Stderr, err)
+				exitCode = 1
+			}
+			w.Flush()
+			if err := w.Error(); err != nil {
+				fmt.Fprintln(os.Stderr, err)
+				exitCode = 1
+			}
+		}
+	}
+	os.Exit(exitCode)
+}