/
main.go
210 lines (185 loc) · 4.49 KB
/
main.go
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package main
import (
"errors"
"flag"
"fmt"
"io"
"os"
"sort"
"strconv"
"strings"
"github.com/Guitarbum722/align"
)
const usage = `Usage: align [-h] [-f] [-o] [-q] [-s] [-d] [-a] [-c] [-i] [-p]
Options:
-h | --help help
-f input file. If not specified, pipe input to stdin
-o output file. (default: stdout)
-q text qualifier (if applicable)
-s delimiter (default: ',')
-d output delimiter (defaults to the value of sep)
-a <left>, <right>, <center> justification (default: left)
-c output specific fields (default: all fields)
-i override justification by column number (e.g. 2:center,5:right)
-p extra padding surrounding delimiter
`
var (
hFlag *bool
helpFlag *bool
fFlag *string
oFlag *string
qFlag *string
sFlag *string
dFlag *string
aFlag *string
cFlag *string
iFlag *string
pFlag *int
)
func main() {
if retval, err := run(); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(retval)
}
}
func init() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage)
}
hFlag = flag.Bool("h", false, usage)
helpFlag = flag.Bool("help", false, usage)
fFlag = flag.String("f", "", "")
oFlag = flag.String("o", "", "")
qFlag = flag.String("q", "", "")
sFlag = flag.String("s", ",", "")
dFlag = flag.String("d", "", "")
aFlag = flag.String("a", "left", "")
cFlag = flag.String("c", "", "")
iFlag = flag.String("i", "", "")
pFlag = flag.Int("p", 1, "")
}
func run() (int, error) {
flag.Parse()
if *dFlag == "" {
*dFlag = *sFlag
}
// check for piped input, but use specified input file if supplied
fi, _ := os.Stdin.Stat()
isPiped := (fi.Mode() & os.ModeCharDevice) == 0
if *hFlag == true || *helpFlag == true {
return 1, errors.New(usage)
}
if !isPiped {
if len(os.Args[1:]) == 0 {
return 1, errors.New(usage)
}
}
var input io.Reader
var output io.Writer
var qu align.TextQualifier
var outColumns []int
var justifyOverrides = make(map[int]align.Justification)
if *iFlag != "" {
c := strings.Split(*iFlag, ",")
for _, v := range c {
if strings.HasSuffix(v, ":right") || strings.HasSuffix(v, ":center") || strings.HasSuffix(v, ":left") {
overrides := strings.Split(v, ":")
v = overrides[0]
num, err := strconv.Atoi(v)
if err != nil {
return 1, errors.New("make sure entry for -v are numbers with a justification separated by ':' (ie 1-right,3-center)")
}
switch overrides[1] {
case "left":
justifyOverrides[num] = align.JustifyLeft
case "center":
justifyOverrides[num] = align.JustifyCenter
case "right":
justifyOverrides[num] = align.JustifyRight
}
}
}
if len(justifyOverrides) < 1 {
return 1, errors.New("make sure entry for -v are numbers with a justification separated by ':' (ie 1:right,3:center)")
}
}
if *cFlag != "" {
c := strings.Split(*cFlag, ",")
outColumns = make([]int, 0, len(c))
// validate specified field numbers and sort them
for _, v := range c {
num, err := strconv.Atoi(v)
if err != nil {
return 1, errors.New("make sure entry for -c are numbers (ie 1,2,5,7)")
}
if num > 0 {
outColumns = append(outColumns, num)
}
}
sort.Ints(outColumns)
}
if *qFlag != "" {
qu = align.TextQualifier{
On: true,
Qualifier: *qFlag,
}
}
if *oFlag != "" {
f, err := os.Create(*oFlag)
if err != nil {
return 1, err
}
defer f.Close()
output = f
} else {
output = os.Stdout
}
if isPiped {
if *fFlag != "" {
f, err := os.Open(*fFlag)
if err != nil {
return 1, err
}
defer f.Close()
input = f
} else {
input = os.Stdin
}
} else {
if *fFlag != "" {
f, err := os.Open(*fFlag)
if err != nil {
return 1, err
}
defer f.Close()
input = f
} else {
return 1, errors.New("no input provided \n" + usage)
}
}
aligner := align.NewAlign(input, output, *sFlag, qu)
switch *aFlag {
case "right":
aligner.UpdatePadding(align.PaddingOpts{
Justification: align.JustifyRight,
ColumnOverride: justifyOverrides,
Pad: *pFlag,
})
case "center":
aligner.UpdatePadding(align.PaddingOpts{
Justification: align.JustifyCenter,
ColumnOverride: justifyOverrides,
Pad: *pFlag,
})
default:
aligner.UpdatePadding(align.PaddingOpts{
Justification: align.JustifyLeft,
ColumnOverride: justifyOverrides,
Pad: *pFlag,
})
}
aligner.FilterColumns(outColumns)
aligner.OutputSep(*dFlag)
aligner.Align()
return 0, nil
}