This is a quick crack at a shell.
Using perl because:
- Easy to get into the concepts, without getting bogged in C,
- Perl has the fork() &c similiar to C, so learning some things
In the end:
- perl packages make it almost trivial,
- got caught up in perl function references...
- but had fun implementing the built-ins.
You need to add via your package manager perl-TermReadLine-Gnu, probably, for
the up-for-history functionality.
Weasel is optional, and perhaps ill-advised.
Follows a minimal shell structure.
Included an annoying welcome message which is implmeneted by a 'weasel' animation (it's not actually an implementation of the dawkin's weasel evolutionary program but has some similiarity).
- Tried to apply something of the proper structure of a terminal, see the accompanying notes.
- create a command table... have sort of done this with the builtins hash...
- subsystems
- flags and wildcards can be implemented by arent...
- the wildcards to need search subdirectories, directories specified
- also need single character matching with
? - wildcards should also sort, and not match hidden files/directories unless
.* - try to reimplement the behaviour of
echo *orls *. - matching subdirectories along the search path, try to implement the expandWildcard(prefix, suffix) funciton suggested in SystemsProgramming
- right now tab use globbing but should also match simple commands, or commands in the path...
To copy across from a obsidian note when that's fleshed out.
Had a crack at implementing this as a module.