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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"strconv"
"github.com/guptarohit/asciigraph"
)
var (
height uint
width uint
offset uint = 3
caption string
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
fmt.Fprintf(os.Stderr, " %s [options]\n", os.Args[0])
fmt.Fprintf(os.Stderr, "Options:\n")
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, "%s expects data points from stdin. Invalid values are logged to stderr.\n", os.Args[0])
}
flag.UintVar(&height, "h", height, "`height` in text rows, 0 for auto-scaling")
flag.UintVar(&width, "w", width, "`width` in columns, 0 for auto-scaling")
flag.UintVar(&offset, "o", offset, "`offset` in columns, for the label")
flag.StringVar(&caption, "c", caption, "`caption` for the graph")
flag.Parse()
data := make([]float64, 0, 64)
s := bufio.NewScanner(os.Stdin)
s.Split(bufio.ScanWords)
for s.Scan() {
word := s.Text()
p, err := strconv.ParseFloat(word, 64)
if err != nil {
log.Printf("ignore %q: cannot parse value", word)
continue
}
data = append(data, p)
}
if err := s.Err(); err != nil {
log.Fatal(err)
}
if len(data) == 0 {
log.Fatal("no data")
}
plot := asciigraph.Plot(data,
asciigraph.Height(int(height)),
asciigraph.Width(int(width)),
asciigraph.Offset(int(offset)),
asciigraph.Caption(caption))
fmt.Println(plot)
}
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