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|
package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
var ticks = []rune{'▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
func histogram(sequence []float64) []rune {
if len(sequence) == 0 {
return []rune{}
}
minVal := sequence[0]
maxVal := sequence[0]
for _, v := range sequence {
if v < minVal {
minVal = v
}
if v > maxVal {
maxVal = v
}
}
scale := (maxVal - minVal) * 256 / float64(len(ticks)-1)
if scale < 1 {
scale = 1
}
result := make([]rune, len(sequence))
for i, v := range sequence {
index := int(((v - minVal) * 256) / scale)
if index >= len(ticks) {
index = len(ticks) - 1
}
result[i] = ticks[index]
}
return result
}
func parseNumbers(input string) ([]float64, error) {
fields := strings.Fields(input)
numbers := make([]float64, 0, len(fields))
for _, field := range fields {
num, err := strconv.ParseFloat(field, 64)
if err != nil {
return nil, fmt.Errorf("invalid number: %s", field)
}
numbers = append(numbers, num)
}
return numbers, nil
}
func readFromStdin() ([]float64, error) {
var numbers []float64
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" {
continue
}
lineNumbers, err := parseNumbers(line)
if err != nil {
return nil, err
}
numbers = append(numbers, lineNumbers...)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("error reading from stdin: %v", err)
}
return numbers, nil
}
func main() {
var numbers []float64
var err error
if len(os.Args) > 1 {
numbers = make([]float64, 0, len(os.Args)-1)
for _, arg := range os.Args[1:] {
num, parseErr := strconv.ParseFloat(arg, 64)
if parseErr != nil {
fmt.Fprintf(os.Stderr, "Invalid number: %s\n", arg)
os.Exit(1)
}
numbers = append(numbers, num)
}
} else {
numbers, err = readFromStdin()
if err != nil {
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
os.Exit(1)
}
if len(numbers) == 0 {
fmt.Fprintln(os.Stderr, "No numbers provided")
os.Exit(1)
}
}
h := histogram(numbers)
fmt.Println(string(h))
}
|
