Add start of base command, flags, prediction

command/base_helpers.go

@@ -0,0 +1,43 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+)
+
+var ErrMissingPath = fmt.Errorf("Missing PATH!")
+
+// extractPath extracts the path and list of arguments from the args. If there
+// are no extra arguments, the remaining args will be nil.
+func extractPath(args []string) (string, []string, error) {
+	if len(args) < 1 {
+		return "", nil, ErrMissingPath
+	}
+
+	// Path is always the first argument after all flags
+	path := args[0]
+
+	// Strip leading and trailing slashes
+	for len(path) > 0 && path[0] == '/' {
+		path = path[1:]
+	}
+	for len(path) > 0 && path[len(path)-1] == '/' {
+		path = path[:len(path)-1]
+	}
+
+	// Trim any leading/trailing whitespace
+	path = strings.TrimSpace(path)
+
+	// Verify we have a path
+	if path == "" {
+		return "", nil, ErrMissingPath
+	}
+
+	// Splice remaining args
+	var remaining []string
+	if len(args) > 1 {
+		remaining = args[1:]
+	}
+
+	return path, remaining, nil
+}