refactor(spec): seperate into small files

commands/core/system.go

@@ -0,0 +1,32 @@
+package core
+
+import (
+	"os"
+	"path/filepath"
+)
+
+var pathCmds = make(map[string]bool)
+
+// scanExternalCommands populates pathCmds with system executables
+func scanExternalCommands() {
+	scanPath()
+}
+
+// scanPath populates pathCmds with all executable files found in path environment variable
+func scanPath() {
+	dirs := filepath.SplitList(os.Getenv("PATH"))
+	for _, dir := range dirs {
+		files, err := os.ReadDir(dir)
+		if err != nil {
+			continue
+		}
+		for _, f := range files {
+			if !f.IsDir() {
+				info, err := f.Info()
+				if err == nil && info.Mode()&0111 != 0 {
+					pathCmds[f.Name()] = true
+				}
+			}
+		}
+	}
+}