`mmgen-tool`: update usage info, add usage details for `twexport`, `twimport`, `rescan_blockchain`

mmgen/tool/help.py

@@ -67,7 +67,7 @@ def usage(cmdname=None,exit_val=1):
 		  Arguments with only type specified in square brackets are required
 
 		  Arguments with both type and default value specified in square brackets are
-		  optional; if used, they must be supplied in the form ‘name=value’
+		  optional and must be specified in the form ‘name=value’
 		"""
 
 	m2 = """
@@ -76,20 +76,20 @@ def usage(cmdname=None,exit_val=1):
 
 		EXAMPLES:
 
-		  Generate a random Bech32 public/private keypair for LTC:
+		  Generate a random LTC Bech32 public/private keypair:
 		  $ mmgen-tool -r0 --coin=ltc --type=bech32 randpair
 
-		  Generate a DASH compressed public key address from the supplied WIF key:
+		  Generate a DASH address with compressed public key from the supplied WIF key:
 		  $ mmgen-tool --coin=dash --type=compressed wif2addr XJkVRC3eGKurc9Uzx1wfQoio3yqkmaXVqLMTa6y7s3M3jTBnmxfw
 
 		  Generate a well-known burn address:
 		  $ mmgen-tool hextob58chk 000000000000000000000000000000000000000000
 
 		  Generate a random 12-word seed phrase:
-		  $ mmgen-tool -r0 mn_rand128
+		  $ mmgen-tool -r0 mn_rand128 fmt=bip39
 
 		  Same as above, but get additional entropy from user:
-		  $ mmgen-tool mn_rand128
+		  $ mmgen-tool mn_rand128 fmt=bip39
 
 		  Encode bytes from a file to base 58:
 		  $ mmgen-tool bytestob58 /etc/timezone pad=20
@@ -97,7 +97,7 @@ def usage(cmdname=None,exit_val=1):
 		  Reverse a hex string:
 		  $ mmgen-tool hexreverse "deadbeefcafe"
 
-		  Same as above, but use a pipe:
+		  Same as above, but supply input via stdin:
 		  $ echo "deadbeefcafe" | mmgen-tool hexreverse -
 		"""
 

mmgen/tool/rpc.py

@@ -187,19 +187,43 @@ class tool_cmd(tool_cmd_base):
 	async def rescan_blockchain(self,
 			start_block: int = None,
 			stop_block: int  = None ):
-		"rescan the blockchain to update historical transactions in the tracking wallet"
+		"""
+		rescan the blockchain to update historical transactions in the tracking wallet
+
+		NOTE:
+
+		  The rescanning process typically takes several hours and may be interrupted
+		  using Ctrl-C.  An interrupted rescan may be resumed using the ‘start_block’
+		  parameter.
+		"""
 		from ..tw.ctl import TrackingWallet
 		ret = await (await TrackingWallet(self.proto,mode='w')).rescan_blockchain(start_block,stop_block)
 		return True
 
 	async def twexport(self,include_amts=True):
-		"export the tracking wallet to JSON format"
+		"""
+		export a tracking wallet to JSON format
+
+		NOTE:
+
+		  If ‘include_amts’ is true (the default), Ethereum balances will be restored
+		  from the dump upon import. For Bitcoin and forks, amount fields in the dump
+		  are ignored.
+		"""
 		from ..tw.json import TwJSON
 		await TwJSON.Export( self.proto, include_amts=include_amts )
 		return True
 
 	async def twimport(self,filename:str,ignore_checksum=False,batch=False):
-		"restore the tracking wallet from a JSON dump created by ‘twexport’"
+		"""
+		restore a tracking wallet from a JSON dump created by ‘twexport’
+
+		NOTE:
+
+		  The restored tracking wallet will have correct balances but no record of
+		  historical transactions.  These may be restored by running ‘mmgen-tool
+		  ‘rescan_blockchain’.
+		"""
 		from ..tw.json import TwJSON
 		await TwJSON.Import( self.proto, filename, ignore_checksum=ignore_checksum, batch=batch )
 		return True