From 4aadde313e2aca87995c9344d20e5a8c5c9e1e7a Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Thu, 10 Sep 2015 19:14:37 +0200
Subject: Use a queue and read from channel (WIP)

---
 gwic.go | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 62 insertions(+), 17 deletions(-)

diff --git a/gwic.go b/gwic.go
index 3c6522a..db35fca 100644
--- a/gwic.go
+++ b/gwic.go
@@ -4,13 +4,26 @@ import (
 	"bufio"
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"regexp"
 	"strings"
 	"text/tabwriter"
 )
 
+type queue struct {
+	q    []string
+	l    int
+	maxl int
+}
+
+func (q *queue) insert(s string) {
+	if len(q.q) < q.maxl {
+		q.q = append(q.q, s)
+		return
+	}
+	q.q = append(q.q[1:len(q.q)], s)
+}
+
 func printWithContext(all []string, ind, ctxlen int) {
 	var slice []string
 	slice = append(slice, "\""+all[ind]+"\"")
@@ -30,32 +43,64 @@ func printWithContext(all []string, ind, ctxlen int) {
 	fmt.Fprintf(tw, "%s\n", strings.Join(slice, "\t"))
 }
 
-var tw *tabwriter.Writer
+func printqueue(q *queue, c chan string, left int) {
+	if left == 0 {
+		fmt.Fprintf(tw, "%s\n", strings.Join(q.q, "\t"))
+		fmt.Fprintf(os.Stdout, "called writer with %v\n", q.q)
+		return
+	}
+	for w := range c {
+		index := strings.Index(w, kw)
+		if index < 0 {
+			q.insert(w)
+			continue
+		}
+		fmt.Fprintf(os.Stdout, "%q totally matched %q\n", w, kw)
+		fmt.Fprintf(os.Stdout, "queue was %v\n", q.q)
+		q.insert(fmt.Sprintf("%q", w))
+		left--
+		printqueue(q, c, left)
+		left = 5
+	}
+}
+
+var (
+	tw *tabwriter.Writer
+	kw string
+)
+
+const MAX int = 10
 
 func main() {
 	flag.Parse()
-	kw := flag.Arg(0)
+	kw = flag.Arg(0)
 	if len(kw) == 0 {
 		fmt.Printf("Need string to search for. Exiting...\n")
 		os.Exit(1)
 	}
 	tw = tabwriter.NewWriter(os.Stdout, 1, 1, 1, ' ', 0)
+	splitreg := regexp.MustCompile("[ \t\n]")
 
-	reader := bufio.NewReader(os.Stdin)
-	all, err := ioutil.ReadAll(reader)
-	if err != nil {
-		fmt.Printf("Could not read everything because there was an error: %q. Exiting\n", err)
-		os.Exit(1)
-	}
+	q := queue{maxl: MAX, q: make([]string, MAX), l: MAX}
+	sc := make(chan string, 1000)
 
-	splitreg := regexp.MustCompile("[ \t\n]")
-	splline := splitreg.Split(string(all), -1)
-	for i, w := range splline {
-		index := strings.Index(w, kw)
-		if index < 0 {
-			continue
+	reader := bufio.NewReader(os.Stdin)
+	line, err := reader.ReadString(byte('\n'))
+	go func(c chan string) {
+		var w string
+		for err == nil {
+			splline := splitreg.Split(line, -1)
+			for _, w = range splline {
+				c <- w
+			}
+			line, err = reader.ReadString(byte('\n'))
 		}
-		printWithContext(splline, i, 5)
-	}
+		fmt.Printf("Got an error: %q.\n", err)
+		c <- w
+		close(c)
+	}(sc)
+
+	printqueue(&q, sc, 5)
+	//printWithContext(splline, i, 5)
 	tw.Flush()
 }
-- 
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