Trsh

its uh.. its a rust shell

todo: aliases variable expansion .trshrc redirection pipelines

trsh Development Roadmap

For most of these, take them as a very loose interpretation of "Complete". Until I start digging into phase 5 I don't think I'll worry much about complete end to end testing. So it's mostly just "This works for a few of the commands I tried with it"

Phase 1: Core (done or nearly done)

• REPL w/ prompt
• Command parsing
• Builtin detection
• Builtins: cd, pwd, alias, unalias, export, unset, exit
• SIMPLE .trshrc support
• -c [script_file]

Phase 2: (Simple) Execution Semantics + (Simple) Control Flow

• Append (Redirection): >>
• Truncate (Redirection): >
• HereDoc (Redirection): <<
• Input (Redirection): <
• Pipes
• Command Sequencing
• Conditionals (if, then, else, fi)
• Conditionals (with test/ [)
• Logic: Ands (&&), ors (||)

Phase 3: Shell Language Features

• Variable Expansion $VAR
• loops (while, for)
• Command Sub $(...)
• Comprehensive Quote Handling

Phase 4: POSIX Compatibility & Testability

• arithmetic sub $((...))
• Incorporate POSIX compat testing
• Start polish/comprehensive testing
• Ensure correctness of exit codes
• Script-local scoping
• History and Job Control

Phase 5: Stretch

• functions
• grouping
• $1 things for function args
• subshells
• i/o redir w/ FD
• !, history, things like that
• plugins?