commands/cli: Added CLI option parsing

commands/cli/parse.go

+package cli
+
+import (
+  "strings"
+  "fmt"
+
+  "github.com/jbenet/go-ipfs/commands"
+)
+
+func Parse(input []string, root *commands.Command) ([]string, []string, map[string]string, error) {
+  opts, input, err := options(input, root)
+  if err != nil {
+    return nil, nil, nil, err
+  }
+
+  return nil, nil, opts, nil
+}
+
+// options parses the raw string values of the given options
+// returns the parsed options as strings, along with the CLI input minus option blobs
+func options(input []string, root *commands.Command) (map[string]string, []string, error) {
+  opts := make(map[string]string)
+  cleanInput := make([]string, 0)
+
+  // TODO: error if one option is defined multiple times
+
+  for i := 0; i < len(input); i++ {
+    blob := input[i]
+
+    if strings.HasPrefix(blob, "--") {
+      name := blob[2:]
+      value := ""
+
+      if strings.Contains(name, "=") {
+        split := strings.SplitN(name, "=", 2)
+        name = split[0]
+        value = split[1]
+      }
+
+      if strings.Contains(name, "-") {
+        return nil, nil, fmt.Errorf("Invalid option blob: '%s' (Shouldn't contain '-')", input[i])
+      }
+
+      if value != "" && strings.Contains(value, "\"") {
+        // TODO: ignore escaped quotations (--foo="\"")
+        if !strings.HasPrefix(value, "\"") {
+          return nil, nil, fmt.Errorf("Invalid option blob: '%s' (Quotation wasn't at the start of value)", input[i])
+        }
+
+        value = value[1:]
+
+        for {
+          if strings.HasSuffix(value, "\"") {
+            value = value[:len(value)-1]
+            break
+          }
+
+          i++
+          if i >= len(input) {
+            return nil, nil, fmt.Errorf("Unterminated string: '%s'", value)
+          }
+
+          value += " " + input[i]
+        }
+
+        if strings.Contains(value, "\"") {
+          return nil, nil, fmt.Errorf("Invalid option blob: '%s' (Value contains unescaped quotation)", value)
+        }
+      }
+
+      opts[name] = value
+
+    } else if strings.HasPrefix(blob, "-") {
+      blob = blob[1:]
+
+      if strings.ContainsAny(blob, "-=\"") {
+        return nil, nil, fmt.Errorf("Invalid option blob: '%s'", input[i])
+      }
+
+      for _, name := range blob {
+        opts[string(name)] = ""
+      }
+
+      // TODO: interpret next blob as value if the last option isn't a bool
+
+    } else {
+      cleanInput = append(cleanInput, blob)
+    }
+  }
+
+  return opts, cleanInput, nil
+}