Set-up testing

Basic app directory parsing and executable detection

app.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"bytes"
+	"log"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+
+	"github.com/probonopd/go-appimage/src/goappimage"
+)
+
+type ExeType byte
+
+const (
+	Script = ExeType(iota + 1)
+	AppImage
+	ELF
+	Win
+)
+
+type Exe struct {
+	Filename string
+	Type     ExeType
+}
+
+type App struct {
+	Name  string
+	Execs []Exe
+	// Image []byte TODO
+}
+
+func ProcessDir(dir string) (*App, error) {
+	fils, err := os.ReadDir(dir)
+	if err != nil {
+		log.Printf("Unable to list files in %v: %v\n", dir, err)
+		return nil, err
+	}
+	app := App{
+		Name: filepath.Base(dir),
+	}
+	for _, f := range fils {
+		if f.IsDir() {
+			continue
+		}
+		var t ExeType
+		if strings.HasSuffix(strings.ToLower(f.Name()), ".exe") {
+			t = Win
+		} else {
+			fil, err := os.Open(filepath.Join(dir, f.Name()))
+			if err != nil {
+				log.Printf("Error opening %v: %v\n", filepath.Join(dir, f.Name()), err)
+				continue
+			}
+			startByts := make([]byte, 4)
+			_, err = fil.Read(startByts)
+			if err != nil {
+				log.Printf("Error reading starting bytes of %v: %v\n", filepath.Join(dir, f.Name()), err)
+				continue
+			}
+			if bytes.HasPrefix(startByts, []byte("#!")) {
+				t = Script
+			} else if bytes.Contains(bytes.ToLower(startByts), []byte("elf")) {
+				if strings.HasSuffix(strings.ToLower(f.Name()), ".so") || strings.Contains(strings.ToLower(f.Name()), ".so.") {
+					continue
+				}
+				if goappimage.IsAppImage(filepath.Join(dir, f.Name())) {
+					t = AppImage
+				} else {
+					t = ELF
+				}
+			}
+		}
+		if t != 0 {
+			app.Execs = append(app.Execs, Exe{
+				Filename: f.Name(),
+				Type:     t,
+			})
+		}
+	}
+	if len(app.Execs) == 0 {
+		return nil, nil
+	}
+	slices.SortFunc(app.Execs, func(a, b Exe) int {
+		if a.Type > b.Type {
+			return 1
+		} else if a.Type < b.Type {
+			return -1
+		}
+		return strings.Compare(a.Filename, b.Filename)
+	})
+	//TODO: get "proper" name & icon, either from AppImage or PortableApps spec
+	return &app, nil
+}