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package main
import (
"bufio"
"flag"
"fmt"
"os"
"regexp"
"strings"
"text/tabwriter"
)
type queue struct {
q []string
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)
}
type work struct {
c chan string
left int
}
func printWithContext(all []string, ind, ctxlen int) {
var slice []string
slice = append(slice, "\""+all[ind]+"\"")
if len(all[:ind]) < ctxlen {
slice = append(all[:ind], slice...)
} else {
slice = append(all[ind-ctxlen:ind], slice...)
}
if len(all[ind:]) < ctxlen {
slice = append(slice, all[ind+1:]...)
} else {
slice = append(slice, all[ind+1:ind+ctxlen]...)
}
fmt.Fprintf(tw, "%s\n", strings.Join(slice, "\t"))
}
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)
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)
}
}
var (
tw *tabwriter.Writer
kw string
)
const MAX int = 11
func main() {
flag.Parse()
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]")
q := queue{maxl: MAX, q: make([]string, MAX)}
sc := make(chan string, 1000)
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'))
}
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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