opensc-explorer: harmonize display of command arguments

* consistently show ellipsis for repeatable arguments as 3 dots
* embrace alternative mandatory arguments with curly braces
* use hyphens instead of spaces within non-literal arguments
  for improved alignment with the manual page

src/tools/opensc-explorer.c

@@ -121,61 +121,61 @@ struct command {
 
 static struct command	cmds[] = {
 	{ do_echo,
-		"echo",	"[<string> ..]",
+		"echo",	"[<string> ...]",
 		"display arguments"			},
 	{ do_ls,
-		"ls",	"[<pattern> ..]",
+		"ls",	"[<pattern> ...]",
 		"list files in the current DF"		},
 	{ do_find,
-		"find",	"[<start id> [<end id>]]",
+		"find",	"[<start-id> [<end-id>]]",
 		"find all files in the current DF"	},
 	{ do_find_tags,
-		"find_tags",	"[<start tag> [<end tag>]]",
+		"find_tags",	"[<start-tag> [<end-tag>]]",
 		"find all tags of data objects in the current context"	},
 	{ do_cd,
-		"cd",	"{.. | <file id> | aid:<DF name>}",
+		"cd",	"{.. | <file-id> | aid:<DF-name>}",
 		"change to another DF"			},
 	{ do_cat,
-		"cat",	"[<file id> | sfi:<sfi id>]"
+		"cat",	"[<file-id> | sfi:<sfi-id>]"
 	,	"print the contents of an EF"		},
 	{ do_info,
-		"info",	"[<file id>]",
+		"info",	"[<file-id>]",
 		"display attributes of card file"	},
 	{ do_create,
-		"create",	"<file id> <size>",
+		"create",	"<file-id> <size>",
 		"create a new EF"			},
 	{ do_mkdir,
-		"mkdir",	"<file id> <size>",
+		"mkdir",	"<file-id> <size>",
 		"create a new DF"			},
 	{ do_delete,
-		"delete",	"<file id>",
+		"delete",	"<file-id>",
 		"remove an EF/DF"			},
 	{ do_delete,
-		"rm",	"<file id>",
+		"rm",	"<file-id>",
 		"remove an EF/DF"			},
 	{ do_pininfo,
-		"pin_info",	"{CHV|KEY|AUT|PRO}<key ref>",
+		"pin_info",	"{CHV|KEY|AUT|PRO}<key-ref>",
 		"get information on PIN or key from the card"	},
 	{ do_verify,
-		"verify",	"{CHV|KEY|AUT|PRO}<key ref> [<pin>]",
+		"verify",	"{CHV|KEY|AUT|PRO}<key-ref> [<pin>]",
 		"present a PIN or key to the card"	},
 	{ do_change,
-		"change",	"CHV<pin ref> [[<old pin>] <new pin>]",
+		"change",	"CHV<pin-ref> [[<old-pin>] <new-pin>]",
 		"change a PIN"                          },
 	{ do_unblock,
-		"unblock",	"CHV<pin ref> [<puk> [<new pin>]]",
+		"unblock",	"CHV<pin-ref> [<puk> [<new-pin>]]",
 		"unblock a PIN"                         },
 	{ do_put,
-		"put",	"<file id> [<input file>]",
+		"put",	"<file-id> [<input-file>]",
 		"copy a local file to the card"		},
 	{ do_get,
-		"get",	"<file id> [<output file>]",
+		"get",	"<file-id> [<output-file>]",
 		"copy an EF to a local file"		},
 	{ do_get_data,
-		"do_get",	"<hex tag> [<output file>]",
+		"do_get",	"<hex-tag> [<output-file>]",
 		"get a data object"			},
 	{ do_put_data,
-		"do_put",	"<hex tag> <data>",
+		"do_put",	"<hex-tag> <data>",
 		"put a data object"			},
 	{ do_erase,
 		"erase",	"",
@@ -184,19 +184,19 @@ static struct command	cmds[] = {
 		"random",	"<count>",
 		"obtain <count> random bytes from card"	},
 	{ do_update_record,
-		"update_record", "<file id> <rec no> <rec offs> <data>",
+		"update_record", "<file-id> <rec-no> <rec-offs> <data>",
 		"update record"				},
 	{ do_update_binary,
-		"update_binary", "<file id> <offs> <data>",
+		"update_binary", "<file-id> <offs> <data>",
 		"update binary"				},
 	{ do_apdu,
-		"apdu",	"<data>+",
+		"apdu",	"<data> ...",
 		"send a custom apdu command"		},
 	{ do_asn1,
-		"asn1",	"[<file id>]",
+		"asn1",	"[<file-id>]",
 		"decode an ASN.1 file"			},
 	{ do_sm,
-		"sm",	"open|close",
+		"sm",	"{open|close}",
 		"call SM 'open' or 'close' handlers, if available"},
 	{ do_debug,
 		"debug",	"[<value>]",