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main.go
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package main
import (
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/gobwas/glob"
)
var ErrEnvVarEmpty = errors.New("getenv: environment variable empty")
func getenvStr(key string) (string, error) {
v := os.Getenv(key)
if v == "" {
return v, ErrEnvVarEmpty
}
return v, nil
}
func getenvInt(key string, def int) (int, error) {
s, err := getenvStr(key)
if err != nil {
return 0, err
}
v, err := strconv.Atoi(s)
if err != nil {
return 0, err
}
return v, nil
}
func getenvBool(key string) (bool, error) {
s, err := getenvStr(key)
if err != nil {
return true, err
}
v, err := strconv.ParseBool(s)
if err != nil {
return true, err
}
return v, nil
}
func check(e error) {
if e != nil {
log.Fatalf("error: %v", e)
}
}
func listFiles(include string, exclude string) ([]string, error) {
fileList := []string{}
err := filepath.Walk(".", func(path string, f os.FileInfo, err error) error {
if doesFileMatch(path, include, exclude) {
fileList = append(fileList, path)
}
return nil
})
return fileList, err
}
func doesFileMatch(path string, include string, exclude string) bool {
if fi, err := os.Stat(path); err == nil && !fi.IsDir() {
includeGlob := glob.MustCompile(include)
excludeGlob := glob.MustCompile(exclude)
return includeGlob.Match(path) && !excludeGlob.Match(path)
}
return false
}
func findAndReplace(path string, find string, replace string, regex bool) (bool, error) {
if find != replace {
read, readErr := ioutil.ReadFile(path)
check(readErr)
var newContents = ""
if regex {
re := regexp.MustCompile(find)
newContents = re.ReplaceAllString(string(read), replace)
} else {
newContents = strings.ReplaceAll(string(read), find, replace)
}
if newContents != string(read) {
writeErr := ioutil.WriteFile(path, []byte(newContents), 0)
check(writeErr)
return true, nil
}
}
return false, nil
}
func setGithubEnvOutput(key string, value int) {
outputFilename := os.Getenv("GITHUB_OUTPUT")
f, err := os.OpenFile(outputFilename,
os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
log.Println(err)
}
defer f.Close()
if _, err := f.WriteString(fmt.Sprintf("%s=%d\n", key, value)); err != nil {
log.Println(err)
}
}
func main() {
include, _ := getenvStr("INPUT_INCLUDE")
exclude, _ := getenvStr("INPUT_EXCLUDE")
find, findErr := getenvStr("INPUT_FIND")
replace, replaceErr := getenvStr("INPUT_REPLACE")
regex, regexErr := getenvBool("INPUT_REGEX")
if findErr != nil {
panic(errors.New("gha-find-replace: expected with.find to be a string"))
}
if replaceErr != nil {
replace = ""
}
if regexErr != nil {
regex = true
}
files, filesErr := listFiles(include, exclude)
check(filesErr)
modifiedCount := 0
for _, path := range files {
modified, findAndReplaceErr := findAndReplace(path, find, replace, regex)
check(findAndReplaceErr)
if modified {
modifiedCount++
}
}
setGithubEnvOutput("modifiedFiles", modifiedCount)
}