Add support for multiple SQL statements

Add support for multiple SQL statements so that one can use the special
commands for apsw.

They need to be individual sql statements because apsw does not use any
delimeter to distinguish a SQL statement a special command.

README.md

@@ -142,6 +142,16 @@ path|num_sections
 /usr/bin/ruby|28
 ```
 
+You can provide _multiple SQL_ statements to the CLI. This is useful if you want to invoke many of the special _dot_ commands. You can use `.help` to see the list of possible commands or refer to the [apsw shell documentation](https://rogerbinns.github.io/apsw/shell.html).
+
+For instance, to have _sqelf_ emit JSON you can do the following:
+```console
+❯ sqlelf /usr/bin/ruby --sql ".mode json" --sql "select path,name from elf_sections LIMIT 3;"
+{ "path": "\/usr\/bin\/ruby", "name": ""},
+{ "path": "\/usr\/bin\/ruby", "name": ".interp"},
+{ "path": "\/usr\/bin\/ruby", "name": ".note.gnu.property"},
+```
+
 ### Queries
 
 #### List all symbol resolutions

sqlelf/cli.py

@@ -31,7 +31,10 @@ def start(args=sys.argv[1:], stdin=sys.stdin):
         "filenames", nargs="+", metavar="FILE", help="The ELF file to analyze"
     )
     parser.add_argument(
-        "-s", "--sql", help="Potential SQL to execute. Omitting this enters the REPL."
+        "-s",
+        "--sql",
+        action="append",
+        help="Potential SQL to execute. Omitting this enters the REPL.",
     )
     parser.add_argument(
         "--recursive",
@@ -83,6 +86,7 @@ def start(args=sys.argv[1:], stdin=sys.stdin):
     shell = apsw.shell.Shell(db=connection, stdin=stdin)
 
     if args.sql:
-        shell.process_complete_line(args.sql)
+        for sql in args.sql:
+            shell.process_complete_line(sql)
     else:
         shell.cmdloop()