wc: basic implementation.

go.mod

@@ -1,5 +1,5 @@
 module github.com/k1574/goblin
 
-go 1.17
+go 1.18
 
 require github.com/k1574/gomtool v0.0.0-20220616060224-023d1559d777 // indirect

m/cmd/goblin/main.go

@@ -2,24 +2,25 @@ package main
 
 import(
 	"github.com/k1574/gomtool/m/multitool"
-	"github.com/k1574/goblin/m/sep/cat"
-	"github.com/k1574/goblin/m/sep/echo"
-	"github.com/k1574/goblin/m/sep/mkdir"
-	"github.com/k1574/goblin/m/sep/gtrue"
-	"github.com/k1574/goblin/m/sep/gfalse"
-	"github.com/k1574/goblin/m/sep/sort"
-	"github.com/k1574/goblin/m/sep/tac"
-	"github.com/k1574/goblin/m/sep/ls"
-	"github.com/k1574/goblin/m/sep/yes"
-	"github.com/k1574/goblin/m/sep/date"
-	"github.com/k1574/goblin/m/sep/uniq"
-	"github.com/k1574/goblin/m/sep/quote"
-	"github.com/k1574/goblin/m/sep/urlprs"
-	"github.com/k1574/goblin/m/sep/noext"
-	"github.com/k1574/goblin/m/sep/mergelbl"
-	"github.com/k1574/goblin/m/sep/basename"
-	"github.com/k1574/goblin/m/sep/ec"
-	"github.com/k1574/goblin/m/sep/read"
+	"github.com/k1574/goblin/m/tool/cat"
+	"github.com/k1574/goblin/m/tool/echo"
+	"github.com/k1574/goblin/m/tool/mkdir"
+	"github.com/k1574/goblin/m/tool/gtrue"
+	"github.com/k1574/goblin/m/tool/gfalse"
+	"github.com/k1574/goblin/m/tool/sort"
+	"github.com/k1574/goblin/m/tool/tac"
+	"github.com/k1574/goblin/m/tool/ls"
+	"github.com/k1574/goblin/m/tool/yes"
+	"github.com/k1574/goblin/m/tool/date"
+	"github.com/k1574/goblin/m/tool/uniq"
+	"github.com/k1574/goblin/m/tool/quote"
+	"github.com/k1574/goblin/m/tool/urlprs"
+	"github.com/k1574/goblin/m/tool/noext"
+	"github.com/k1574/goblin/m/tool/mergelbl"
+	"github.com/k1574/goblin/m/tool/basename"
+	"github.com/k1574/goblin/m/tool/ec"
+	"github.com/k1574/goblin/m/tool/read"
+	"github.com/k1574/goblin/m/tool/wc"
 )
 
 func main() {
@@ -42,6 +43,7 @@ func main() {
 		"mergelbl" : mergelbl.Run,
 		"ec" : ec.Run,
 		"read" : read.Run,
+		"wc" : wc.Run,
 	}
 
 	multitool.Main("goblin", tools)

m/tool/sort/sort.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"sort"
 	"flag"
-	"github.com/k1574/goblin/m/gen/input"
+	"github.com/k1574/goblin/m/input"
 )
 
 func Run(args []string) {

m/tool/wc/main.go

@@ -0,0 +1,101 @@
+package wc
+
+import (
+	"os"
+	"io"
+	"bufio"
+	"fmt"
+	"unicode"
+	"flag"
+	"strconv"
+)
+
+var (
+	vals [lastFlag]int
+	flags [lastFlag]bool
+	flagList []int
+)
+
+const (
+	wordsFlag = iota
+	runesFlag
+	charsFlag
+	linesFlag
+	lastFlag
+)
+
+func rdRune(rd *bufio.Reader) (rune, int) {
+	r, siz, err := rd.ReadRune()
+	if err == io.EOF {
+		finish()
+	} else if err != nil {
+		panic(err)
+	}
+	return r, siz
+}
+
+func finish() {
+	str := ""
+	for i, v := range flagList {
+		str += strconv.Itoa(vals[v])
+		if i != ( len(flagList)-1 ) {
+			str += "\t"
+		}
+	}
+	fmt.Print(str)
+	os.Exit(0)
+}
+
+func Run(args []string) {
+	var (
+		r rune
+		siz int
+	)
+	arg0 := args[0]
+	args = args[1:]
+	flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
+
+	flagSet.BoolVar(&flags[charsFlag], "c", false, "print amount of chars(bytes)")
+	flagSet.BoolVar(&flags[runesFlag], "r", false, "print amount of runes in UTF stream")
+	flagSet.BoolVar(&flags[wordsFlag], "w", false, "print amount of words")
+	flagSet.BoolVar(&flags[linesFlag], "l", false, "print amount of lines")
+
+	flagSet.Parse(args)
+
+	for i, v := range flags {
+		if v {
+			break;
+		} else if i == (len(flags) - 1){
+			flagSet.Usage()
+			os.Exit(1)
+		}
+	}
+
+	for i, v := range flags {
+		if v {
+			flagList = append(flagList, i)
+		}
+	}
+
+	rd := bufio.NewReader(os.Stdin)
+	inWord := false
+	for {
+		r, siz = rdRune(rd)
+		if inWord {
+			if unicode.IsSpace(r) {
+				inWord = false
+			}
+		} else {
+			if !unicode.IsSpace(r) {
+				vals[wordsFlag]++
+				inWord = true
+			}
+		}
+		vals[runesFlag]++
+		vals[charsFlag] += siz
+		if r == rune('\n') {
+			vals[linesFlag]++
+		}
+	}
+	finish()
+}

m/tool/yes/yes.go

@@ -6,7 +6,7 @@ import(
 	"fmt"
 	"flag"
 	"strings"
-	"github.com/k1574/goblin/m/gen/input"
+	"github.com/k1574/goblin/m/input"
 )
 var(
 	nArg int