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|
package main
import (
"bufio"
"fmt"
"os"
"regexp"
"strings"
)
func main() {
if err := formatBenchmarks("README.md"); err != nil {
_, _ = fmt.Fprintln(os.Stderr, err) //nolint:errcheck // printing error only
os.Exit(1)
}
}
func formatBenchmarks(path string) error {
file, err := os.Open(path) // #nosec G304
if err != nil {
return err
}
defer file.Close() //nolint:errcheck // No need to check close error
lines := []string{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
return err
}
type meta struct {
kind string
index int
}
lineMeta := make([]meta, len(lines))
benchEntries := [][]string{}
memEntries := [][]string{}
inBlock := false
re := regexp.MustCompile(`\S+`)
for i, line := range lines {
trimmed := strings.TrimSpace(line)
switch {
case trimmed == "```text":
inBlock = true
case trimmed == "```" && inBlock:
inBlock = false
default:
if inBlock {
expanded := strings.ReplaceAll(line, "\t", " ")
if strings.Contains(expanded, "ns/op") {
toks := re.FindAllString(expanded, -1)
benchEntries = append(benchEntries, toks)
lineMeta[i] = meta{kind: "bench", index: len(benchEntries) - 1}
} else if strings.Contains(expanded, "allocs/op") {
toks := re.FindAllString(expanded, -1)
memEntries = append(memEntries, toks)
lineMeta[i] = meta{kind: "mem", index: len(memEntries) - 1}
}
}
}
}
benchWidths := columnWidths(benchEntries)
memWidths := columnWidths(memEntries)
var output []string
inBlock = false
for i, line := range lines {
trimmed := strings.TrimSpace(line)
switch {
case trimmed == "```text":
inBlock = true
output = append(output, line)
continue
case trimmed == "```" && inBlock:
inBlock = false
output = append(output, line)
continue
}
m := lineMeta[i]
if m.kind == "bench" {
toks := benchEntries[m.index]
formatted := []string{}
for j, t := range toks {
switch j {
case 0:
formatted = append(formatted, padRight(t, benchWidths[j]))
case 1, 2, 4, 6:
formatted = append(formatted, padLeft(t, benchWidths[j]))
default:
formatted = append(formatted, t)
}
}
output = append(output, strings.Join(formatted, " "))
} else if m.kind == "mem" {
toks := memEntries[m.index]
formatted := []string{}
for j, t := range toks {
switch j {
case 0, 2:
formatted = append(formatted, padLeft(t, memWidths[j]))
default:
formatted = append(formatted, t)
}
}
output = append(output, strings.Join(formatted, " "))
} else {
output = append(output, line)
}
}
out := strings.Join(output, "\n")
if !strings.HasSuffix(out, "\n") {
out += "\n"
}
return os.WriteFile(path, []byte(out), 0o600) // #nosec G306
}
func columnWidths(entries [][]string) []int {
maxCols := 0
for _, e := range entries {
if len(e) > maxCols {
maxCols = len(e)
}
}
widths := make([]int, maxCols)
for _, e := range entries {
for i, t := range e {
if len(t) > widths[i] {
widths[i] = len(t)
}
}
}
return widths
}
func padLeft(s string, n int) string {
if len(s) >= n {
return s
}
return strings.Repeat(" ", n-len(s)) + s
}
func padRight(s string, n int) string {
if len(s) >= n {
return s
}
return s + strings.Repeat(" ", n-len(s))
}
|
