Initial commit

Author: yuya-takeyama

.gitignore

@@ -0,0 +1,3 @@
+/build
+/percentile
+/pkg

README.md

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+# percentile
+
+Show percentile of input numbers.
+
+## Installation
+
+```
+$ go get github.com/yuya-takeyama/percentile
+```
+
+## Usage
+
+```
+$ seq 100 | percentile
+50%:    50
+66%:    66
+75%:    75
+80%:    80
+90%:    90
+95%:    95
+98%:    98
+99%:    99
+100%:   100
+```
+
+## License
+
+The MIT License
+
+## Author
+
+Yuya Takeyama

main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"strconv"
+
+	flags "github.com/jessevdk/go-flags"
+	"github.com/yuya-takeyama/argf"
+)
+
+const AppName = "numstat"
+
+type Options struct {
+	ShowVersion bool `short:"v" long:"version" description:"Show version"`
+}
+
+var opts Options
+
+var numbers sort.Float64Slice
+
+func main() {
+	parser := flags.NewParser(&opts, flags.Default^flags.PrintErrors)
+	parser.Name = AppName
+	parser.Usage = "[OPTIONS] FILES..."
+
+	args, err := parser.Parse()
+	if err != nil {
+		fmt.Fprint(os.Stderr, err)
+		return
+	}
+
+	r, err := argf.From(args)
+	if err != nil {
+		panic(err)
+	}
+
+	err = percentile(r, os.Stdout, os.Stderr, opts)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func percentile(r io.Reader, stdout io.Writer, stderr io.Writer, opts Options) error {
+	if opts.ShowVersion {
+		io.WriteString(stdout, fmt.Sprintf("%s v%s, build %s\n", AppName, Version, GitCommit))
+		return nil
+	}
+
+	reader := bufio.NewReader(r)
+	var line []byte
+	var err error
+	for {
+		if line, _, err = reader.ReadLine(); err == io.EOF {
+			break
+		} else if err != nil {
+			panic(err)
+		}
+
+		f, convErr := strconv.ParseFloat(string(line), 64)
+		if convErr != nil {
+			fmt.Fprintf(stderr, "number conversion error: %s\n", convErr)
+			continue
+		}
+
+		numbers = append(numbers, f)
+	}
+
+	sort.Sort(numbers)
+	l := len(numbers)
+
+	printPercentileN(stdout, &numbers, l, 50)
+	printPercentileN(stdout, &numbers, l, 66)
+	printPercentileN(stdout, &numbers, l, 75)
+	printPercentileN(stdout, &numbers, l, 80)
+	printPercentileN(stdout, &numbers, l, 90)
+	printPercentileN(stdout, &numbers, l, 95)
+	printPercentileN(stdout, &numbers, l, 98)
+	printPercentileN(stdout, &numbers, l, 99)
+	printPercentileN(stdout, &numbers, l, 100)
+
+	return nil
+}
+
+func percentileN(numbers *sort.Float64Slice, l, n int) float64 {
+	i := l*n/100 - 1
+	ns := *numbers
+
+	return ns[i]
+}
+
+func printPercentileN(w io.Writer, numbers *sort.Float64Slice, l, n int) {
+	fmt.Fprintf(w, "%d%%:\t%s\n", n, strconv.FormatFloat(percentileN(numbers, l, n), 'g', 16, 64))
+}

release.sh

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+ggallin release --os="linux darwin" --username=yuya-takeyama

version.go

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+package main
+
+const Version string = "0.0.1"
+
+var GitCommit = ""