From f7faf074f4fba3a1ffc26f11246c8cdc856b58ba Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Thu, 24 Sep 2015 21:09:16 +0200
Subject: Try to use a worker-based approach (WIP)

---
 gwic.go | 55 ++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/gwic.go b/gwic.go
index 5133557..c806196 100644
--- a/gwic.go
+++ b/gwic.go
@@ -23,6 +23,11 @@ func (q *queue) insert(s string) {
 	q.q = append(q.q[1:len(q.q)], s)
 }
 
+type work struct {
+	c    chan string
+	left int
+}
+
 func printWithContext(all []string, ind, ctxlen int) {
 	var slice []string
 	slice = append(slice, "\""+all[ind]+"\"")
@@ -42,24 +47,56 @@ func printWithContext(all []string, ind, ctxlen int) {
 	fmt.Fprintf(tw, "%s\n", strings.Join(slice, "\t"))
 }
 
-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
+func feedworkers(wlist []*work, w string) []*work {
+	var onefinished bool
+	var ret []*work
+	for _, wc := range wlist {
+		if wc.left == 0 {
+			close(wc.c)
+			onefinished = true
+		}
+	}
+
+	if onefinished && len(wlist) > 1 {
+		ret = wlist[1:]
+	}
+	return ret
+}
+
+func print_kwic(sl []string, c chan string) {
+	for w := range c {
+		sl = append(sl, w)
 	}
+	fmt.Fprintf(tw, "%s\n", strings.Join(sl, "\t"))
+}
+
+func printqueue(q *queue, c chan string, left int) {
+	var hungryhippos []*work
 	for w := range c {
 		index := strings.Index(w, kw)
 		if index < 0 {
 			q.insert(w)
+			feedworkers(hungryhippos, w)
 			continue
 		}
+
+		q.insert(fmt.Sprintf("%q", w))
+
 		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
+
+		wc := &work{c: make(chan string), left: 5}
+
+		feedworkers(hungryhippos, w)
+
+		sl := make([]string, MAX)
+		n := copy(sl, q.q[6:])
+		fmt.Fprintf(os.Stdout, "copied %d : %v\n", n, sl)
+		hungryhippos = append(hungryhippos, wc)
+		go print_kwic(sl, wc.c)
+	}
+	for _, wc := range hungryhippos {
+		close(wc.c)
 	}
 }
 
-- 
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