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runner.go
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runner.go
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package command
import (
"fmt"
"go/build"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
)
func Detect(cwd string, args []string, generateMode bool) ([]Invocation, error) {
if generateMode || invokedByGoGenerate() {
return invocations(cwd, generateMode)
}
i, err := NewInvocation("", 0, args)
if err != nil {
return nil, err
}
return []Invocation{i}, nil
}
type Invocation struct {
Args []string
Line int
File string
}
func NewInvocation(file string, line int, args []string) (Invocation, error) {
if len(args) < 1 {
return Invocation{}, fmt.Errorf("%s:%v an invocation of counterfeiter must have arguments", file, line)
}
i := Invocation{
File: file,
Line: line,
Args: args,
}
return i, nil
}
func invokedByGoGenerate() bool {
return os.Getenv("DOLLAR") == "$"
}
func invocations(cwd string, generateMode bool) ([]Invocation, error) {
var result []Invocation
// Find all the go files
pkg, err := build.ImportDir(cwd, build.IgnoreVendor)
if err != nil {
return nil, err
}
gofiles := make([]string, 0, len(pkg.GoFiles)+len(pkg.CgoFiles)+len(pkg.TestGoFiles)+len(pkg.XTestGoFiles))
gofiles = append(gofiles, pkg.GoFiles...)
gofiles = append(gofiles, pkg.CgoFiles...)
gofiles = append(gofiles, pkg.TestGoFiles...)
gofiles = append(gofiles, pkg.XTestGoFiles...)
sort.Strings(gofiles)
var line int
if !generateMode {
// generateMode means counterfeiter:generate, not go:generate
line, err = strconv.Atoi(os.Getenv("GOLINE"))
if err != nil {
return nil, err
}
}
for i := range gofiles {
i, err := open(cwd, gofiles[i], generateMode)
if err != nil {
return nil, err
}
result = append(result, i...)
if generateMode {
continue
}
if len(result) > 0 && result[0].File != os.Getenv("GOFILE") {
return nil, nil
}
if len(result) > 0 && result[0].Line != line {
return nil, nil
}
}
return result, nil
}
var directive = regexp.MustCompile(`(?mi)^//(go:generate|counterfeiter:generate)\s*(.*)?\s*$`)
var args = regexp.MustCompile(`(?mi)^(?:go run github\.com/maxbrunsfeld/counterfeiter/v6|gobin -m -run github\.com/maxbrunsfeld/counterfeiter/v6|counterfeiter|counterfeiter.exe)\s*(.*)?\s*$`)
type match struct {
directive string
args []string
}
func matchForString(s string) *match {
m := directive.FindStringSubmatch(s)
if m == nil {
return nil
}
if m[1] == "counterfeiter:generate" {
return &match{
directive: m[1],
args: stringToArgs(m[2]),
}
}
m2 := args.FindStringSubmatch(m[2])
if m2 == nil {
return nil
}
return &match{
directive: m[1],
args: stringToArgs(m2[1]),
}
}
func open(dir string, file string, generateMode bool) ([]Invocation, error) {
str, err := ioutil.ReadFile(filepath.Join(dir, file))
if err != nil {
return nil, err
}
lines := strings.Split(string(str), "\n")
var result []Invocation
line := 0
for i := range lines {
line++
match := matchForString(lines[i])
if match == nil {
continue
}
inv, err := NewInvocation(file, line, match.args)
if err != nil {
return nil, err
}
if generateMode && match.directive == "counterfeiter:generate" {
result = append(result, inv)
}
if !generateMode && match.directive == "go:generate" {
if len(inv.Args) == 2 && strings.EqualFold(strings.TrimSpace(inv.Args[1]), "-generate") {
continue
}
result = append(result, inv)
}
}
return result, nil
}
func stringToArgs(s string) []string {
a := strings.Fields(s)
result := []string{
"counterfeiter",
}
result = append(result, a...)
return result
}