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/
csvgrep.go
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/
csvgrep.go
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/*
Pretty-print lines matching a pattern in CSV files.
Transparent support for gzipped/bzipped files.
TODO
Make possible to customize output format
Match only specific field by index or name
Match only whole field
The author disclaims copyright to this source code.
*/
package main
import (
"flag"
"fmt"
"log"
"os"
"regexp"
"strconv"
"strings"
"text/tabwriter"
"github.com/gwenn/yacr"
)
type config struct {
fields []uint64
ignoreCase bool
wholeWord bool
noHeader bool
sep byte
guess bool
quoted bool
start int
descMode bool
}
func isFile(name string) bool {
s, err := os.Stat(name)
return err == nil && ((s.Mode()&os.ModeType == 0) || (s.Mode()&os.ModeSymlink != 0))
}
/*
-H --with-filename
-h --no-filename
-c column number
*/
func parseArgs() *config {
var i = flag.Bool("i", false, "ignore case distinctions")
var w = flag.Bool("w", false, "force PATTERN to match only whole words")
var n = flag.Bool("n", false, "no header")
var d = flag.Bool("d", false, "only show header/describe first line (no grep)")
var q = flag.Bool("q", true, "quoted field mode")
var sep = flag.String("s", ",", "set the field separator")
var f = flag.String("f", "", "set the field indexes to be matched (starts at 1)")
var v = flag.Int("v", 1, "first column number in output/result")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [-i] [-w] [-n] [-q] [-s=C] [-v=N] [-f=N,...] [-d|PATTERN] FILE...\n", os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() == 0 {
flag.Usage()
if *d {
log.Fatalf("Missing FILE argument\n")
} else {
log.Fatalf("Missing PATTERN argument\n")
}
}
// TODO Add support to Stdin when no file is specified?
if flag.NArg() == 1 && !*d {
flag.Usage()
if isFile(flag.Arg(0)) {
log.Fatalf("Missing PATTERN argument\n")
} else {
log.Fatalf("Missing FILE argument\n")
}
}
if len(*sep) == 0 {
flag.Usage()
log.Fatalf("Separator value missing\n")
} else if *sep == "\\t" {
*sep = "\t"
} else if len(*sep) > 1 {
flag.Usage()
log.Fatalf("Separator must be only one character long\n")
}
guess := true
flag.Visit(func(f *flag.Flag) {
if f.Name == "s" {
guess = false
}
})
var fields []uint64
if len(*f) > 0 {
rawFields := strings.Split(*f, ",")
fields = make([]uint64, len(rawFields))
for i, s := range rawFields {
f, err := strconv.ParseUint(s, 10, 0)
if err != nil {
flag.Usage()
log.Fatalf("Invalid field index (%v)\n", s)
}
fields[i] = f - 1
}
}
return &config{noHeader: *n, ignoreCase: *i, wholeWord: *w, sep: (*sep)[0], guess: guess, quoted: *q, start: *v, fields: fields, descMode: *d}
}
func match(fields []uint64, pattern *regexp.Regexp, values [][]byte) bool {
if values == nil {
return false
} else if len(fields) == 0 {
for _, value := range values {
if pattern.Match(value) {
return true
}
}
return false
}
for _, field := range fields {
value := values[field]
//fmt.Printf("%v %s\n", value, pattern)
if pattern.Match(value) {
return true
}
}
return false
}
func grep(pattern *regexp.Regexp, f string, config *config) (found bool, err error) {
//fmt.Println(f, config)
in, err := yacr.Zopen(f)
if err != nil {
return
}
defer in.Close()
reader := yacr.NewReader(in, config.sep, config.quoted, config.guess)
var headers []string
if config.noHeader && !config.descMode {
} else {
for reader.Scan() {
headers = append(headers, reader.Text())
if reader.EndOfRecord() {
break
}
}
// TODO Try to guess/fix the separator if an error occurs (or if only one column is found)
if err = reader.Err(); err != nil {
return
}
//fmt.Printf("Headers: %v (%d)\n", headers)
}
//tw := tabwriter.NewWriter(os.Stdout, 8, 1, 8, '\t', tabwriter.Debug)
tw := tabwriter.NewWriter(os.Stdout, 0, 4, 2, ' ', 0)
if config.descMode {
fmt.Println(f, ":")
for i, value := range headers {
tw.Write([]byte(fmt.Sprintf("%d\t%s\n", i+config.start, value)))
}
tw.Flush()
return
}
var values = make([][]byte, 0, 10)
var v, cv []byte
orig := values
i := 0
for reader.Scan() {
v = reader.Bytes() // must be copied
if i < len(orig) {
cv = orig[i]
cv = append(cv[:0], v...)
} else {
cv = make([]byte, len(v))
copy(cv, v)
}
values = append(values, cv)
if !reader.EndOfRecord() {
i++
continue
}
if match(config.fields, pattern, values) {
if !found {
fmt.Println(f, ":")
found = true
}
fmt.Println("-")
for i, value := range values {
if config.noHeader {
tw.Write([]byte(fmt.Sprintf("%d\t%s\n", i+config.start, value)))
} else if i < len(headers) {
tw.Write([]byte(fmt.Sprintf("%d\t%s\t%s\n", i+config.start, headers[i], value)))
} else {
tw.Write([]byte(fmt.Sprintf("%d\t%s\t%s\n", i+config.start, "???", value)))
}
}
tw.Flush()
}
orig = values
values = values[:0]
i = 0
}
err = reader.Err()
return
}
func mustCompile(p string, config *config) *regexp.Regexp {
if config.wholeWord {
p = "\\b" + p + "\\b"
}
if config.ignoreCase {
p = "(?i)" + p
}
return regexp.MustCompile(p)
}
func main() {
config := parseArgs()
var start int
var pattern *regexp.Regexp
if !config.descMode {
start = 1
pattern = mustCompile(flag.Arg(0), config)
}
errorCount := 0
matchCount := 0
found := false
for i := start; i < flag.NArg(); i++ {
if found {
fmt.Println("---")
found = false
}
f := flag.Arg(i)
found, err := grep(pattern, f, config)
if err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
errorCount++
} else if found {
matchCount++
}
}
if errorCount > 0 || matchCount == 0 {
os.Exit(1)
}
}