Write code

,.(:.---).

.gitignore

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+*.swp
+cmd/cmd

README.md

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+punctuation
+===========
+
+Words and symbols in, punctuation out. Inspired by an [article on punctuation in novels](https://medium.com/@neuroecology/punctuation-in-novels-8f316d542ec4).

cmd/main.go

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+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/thebaer/punctuation"
+)
+
+func main() {
+	o := punctuation.Extract(os.Stdin)
+	fmt.Println(o)
+}

punctuation.go

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+// punctuation takes text and gives back only punctuation.
+package punctuation
+
+import (
+	"bufio"
+	"os"
+	"strings"
+)
+
+const validPunc = ";:'\",!?.-()"
+
+func Extract(f *os.File) string {
+	var out string
+	in := bufio.NewScanner(f)
+	for in.Scan() {
+		out += strings.Map(func(r rune) rune {
+			if strings.IndexRune(validPunc, r) >= 0 {
+				return r
+			}
+			return -1
+		}, in.Text())
+	}
+
+	return out
+}