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|
package shell
import (
"bufio"
"errors"
"io/fs"
"os/exec"
"path/filepath"
"pik/identity"
"pik/indexers/pikdex"
"pik/model"
"pik/runner"
"pik/spool"
"slices"
"strings"
)
//TODO: Clean up shell selection? Maybe default to bash?
var NoContentError = errors.New("not enough content in target")
var NoShellError = errors.New("could not find any shell interpreters")
var ExtShellMap = map[string]string{
".sh": "bash",
".ps1": "powershell",
}
var Shells = []string{"bash", "bash.exe", "zsh", "fish", "powershell", "powershell.exe", "cmd.exe"}
var Runner = &shell{
Locations: map[string]string{},
}
type shell struct {
Locations map[string]string
}
var WrongTargetError = errors.New("wrong target type")
func (s *shell) Hydrate(target model.Target) (model.HydratedTarget, error) {
cast, ok := target.(*ShellTarget)
if !ok {
return nil, WrongTargetError
}
hyd := &HydratedShellTarget{BaseHydration: runner.Hydrated(cast)}
return hyd, nil
}
func (s *shell) Wants(f fs.FS, file string, entry fs.DirEntry) (bool, error) {
if entry != nil && entry.IsDir() {
return false, nil
}
fd, err := f.Open(file)
if err != nil {
return false, err
}
scanner := bufio.NewScanner(fd)
scanner.Split(bufio.ScanRunes)
if !scanner.Scan() {
return false, nil
}
txt := scanner.Text()
if txt == "#" { //
return true, nil
}
for k, _ := range ExtShellMap {
if strings.HasSuffix(file, k) {
return true, nil
}
}
return false, nil
}
func (s *shell) Find(shell string) (string, error) {
if s.Locations[shell] != "" {
return s.Locations[shell], nil
}
if p, err := exec.LookPath(shell); err == nil {
s.Locations[shell] = p
return shell, nil
} else {
return "", err
}
}
func (s *shell) CreateTarget(fs fs.FS, src string, file string, _ fs.DirEntry) (model.Target, error) {
shell, err := s.ShellFor(fs, file)
if err != nil {
return nil, err
}
_, filename := filepath.Split(file)
var sub []string
split := strings.Split(file, "/")
for _, p := range split {
if slices.Contains(pikdex.Roots, p) {
continue
}
if filename == p {
continue
}
sub = append(sub, p)
}
return &ShellTarget{
BaseTarget: runner.BaseTarget{
Identity: identity.New(filename),
MyTags: model.TagsFromFilename(filename),
},
Shell: shell,
Script: file,
SubValue: sub,
}, nil
}
func (s *shell) ShellFor(fs fs.FS, file string) (string, error) {
var shell, shebang string
// low-hanging fruit - indicative filename
if byFile := s.ShellByFilename(file); byFile != "" {
return byFile, nil
}
fd, err := fs.Open(file)
if err != nil {
return "", err
}
scanner := bufio.NewScanner(fd)
scanner.Split(bufio.ScanLines)
if !scanner.Scan() {
return "", NoContentError
}
txt := scanner.Text()
if strings.HasPrefix(txt, "#!") {
// shebang found
for _, potentialShell := range Shells {
if strings.Contains(txt, potentialShell) {
shebang = shell
if loc, err := s.Find(potentialShell); err == nil {
shell = loc
} else {
_, _ = spool.Warn("script has %s but could not find %s (%s)\n", shebang, potentialShell)
}
}
}
}
if shebang == "" {
// if no shebang, just send the first one we find
for _, s := range Shells {
if p, err := exec.LookPath(s); err != nil {
shell = p
}
}
}
if shell == "" {
return "", NoShellError
}
return shell, nil
}
func (s *shell) ShellByFilename(file string) string {
ext := filepath.Ext(file)
if ExtShellMap[ext] != "" {
sh, err := s.Find(ExtShellMap[ext])
if err == nil {
return sh
}
}
return ""
}
|
