Restarting MzScheme with Arguments: restart.ss

Simulates starting the stand-alone version of MzScheme with the vector of command-line strings argv. The init-argv, adjust-flag-table, and init-namespace arguments are used to modify the default settings for command-line flags, adjust the parsing of command-line flags, and customize the initial namespace, respectively.

The vector of strings init-argv is read first with the standard MzScheme command-line parsing. Flags that load files or evaluate expressions (e.g., -f and -e) are ignored, but flags that set MzScheme's modes (e.g., -g or -m) effectively set the default mode before argv is parsed.

Before argv is parsed, the procedure adjust-flag-table is called with a command-line flag table as accepted by parse-command-line (see section 15.2.3). The return value must also be a table of command-line flags, and this table is used to parse argv. The intent is to allow adjust-flag-table to add or remove flags from the standard set.

After argv is parsed, a new thread and a namespace are created for the ``restarted'' MzScheme. (The new namespace is installed as the current namespace in the new thread.) In the new thread, restarting performs the following actions:

• The init-namespace procedure is called with no arguments. The return value is ignored.
• Expressions and files specified by argv are evaluated and loaded. If an error occurs, the remaining expressions and files are ignored, and the return value for restart-mzscheme is set to #f.
• The read-eval-print-loop procedure is called, unless a flag in init-argv or argv disables it. When read-eval-print-loop returns, the return value for restart-mzscheme is set to #t.