python: Wrap utility functions.

* NEWS: Update.
* lang/python/gpg/core.py (pubkey_algo_string): New function.
(pubkey_algo_name): Add docstring.
(hash_algo_name): Likewise.
(get_protocol_name): Likewise.
(addrspec_from_uid): New function.
* lang/python/gpgme.i (gpgme_pubkey_algo_string): Result must be
freed.
(gpgme_addrspec_from_uid): Likewise.

Signed-off-by: Justus Winter <justus@g10code.com>

NEWS

@@ -13,9 +13,11 @@ Noteworthy changes in version 1.8.1 (unreleased)
  cpp: Key::addUid()                                 NEW.
  qt: CryptoConfig::stringValueList()                NEW.
  gpgme_data_rewind                                  UN-DEPRECATE.
- py: Context.__init__  EXTENDED: New keyword argument home_dir.
- py: Context.home_dir  NEW.
- py: Context.keylist   EXTENDED: New keyword argument mode.
+ py: Context.__init__        EXTENDED: New keyword arg home_dir.
+ py: Context.home_dir        NEW.
+ py: Context.keylist         EXTENDED: New keyword arg mode.
+ py: core.pubkey_algo_string NEW.
+ py: core.addrspec_from_uid  NEW.
 
 
 Noteworthy changes in version 1.8.0 (2016-11-16)

lang/python/gpg/core.py

@@ -1118,15 +1118,64 @@ class Data(GpgmeWrapper):
                 chunks.append(result)
             return b''.join(chunks)
 
+def pubkey_algo_string(subkey):
+    """Return short algorithm string
+
+    Return a public key algorithm string (e.g. "rsa2048") for a given
+    SUBKEY.
+
+    Returns:
+    algo      - a string
+
+    """
+    return gpgme.gpgme_pubkey_algo_string(subkey)
+
 def pubkey_algo_name(algo):
+    """Return name of public key algorithm
+
+    Return the name of the public key algorithm for a given numeric
+    algorithm id ALGO (cf. RFC4880).
+
+    Returns:
+    algo      - a string
+
+    """
     return gpgme.gpgme_pubkey_algo_name(algo)
 
 def hash_algo_name(algo):
+    """Return name of hash algorithm
+
+    Return the name of the hash algorithm for a given numeric
+    algorithm id ALGO (cf. RFC4880).
+
+    Returns:
+    algo      - a string
+
+    """
     return gpgme.gpgme_hash_algo_name(algo)
 
 def get_protocol_name(proto):
+    """Get protocol description
+
+    Get the string describing protocol PROTO.
+
+    Returns:
+    proto     - a string
+
+    """
     return gpgme.gpgme_get_protocol_name(proto)
 
+def addrspec_from_uid(uid):
+    """Return the address spec
+
+    Return the addr-spec (cf. RFC2822 section 4.3) from a user id UID.
+
+    Returns:
+    addr_spec - a string
+
+    """
+    return gpgme.gpgme_addrspec_from_uid(uid)
+
 def check_version(version=None):
     return gpgme.gpgme_check_version(version)
 

lang/python/gpgme.i

@@ -113,6 +113,8 @@
 /* Release returned buffers as necessary.  */
 %typemap(newfree) char * "gpgme_free($1);";
 %newobject gpgme_data_release_and_get_mem;
+%newobject gpgme_pubkey_algo_string;
+%newobject gpgme_addrspec_from_uid;
 
 %typemap(arginit) gpgme_key_t [] {
   $1 = NULL;