measure.go

package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "path/filepath"
    "regexp"
    "strings"
    "unicode/utf8"
)

func check(err error) {
    if err != nil {
        panic(err)
    }
}

func readLines(path string) []string {
    srcBytes, err := ioutil.ReadFile(path)
    check(err)
    return strings.Split(string(srcBytes), "\n")
}

var commentPat = regexp.MustCompile("\\s*\\/\\/")

func main() {
    sourcePaths, err := filepath.Glob("./examples/*/*")
    check(err)
    foundLongFile := false
    for _, sourcePath := range sourcePaths {
        foundLongLine := false
        lines := readLines(sourcePath)
        for i, line := range lines {
            if !foundLongLine && !commentPat.MatchString(line) && (utf8.RuneCountInString(line) > 58) {
                fmt.Printf("measure: %s:%d\n", sourcePath, i+1)
                foundLongLine = true
                foundLongFile = true
            }
        }
    }
    if foundLongFile {
        os.Exit(1)
    }
}