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Gabriel Horner > Fry-Shell-0.15 > Fry::Developer


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Fry::Developer - Documentation for Developers


My interest in shells began with databases and mind management software. I've been fascinated with these for some time. Mind management software are programs providing an intuitive interface to storing and retrieving personal data. I soon got tired of being limited by rigid,feature-frozen programs and so I began writing my own. I began with storing basic information via DBI. Eventually I yearned for a more intuitive API and began using Class::DBI. As I wrote wrappers around Class::DBI commands, I noticed the basic steps for writing one: parse the user input for flags and options,expand abbreviations in the input, and convert input into a data structure to pass to the desired method. As my list of commands grew, I broke them up into libraries to avoid overcongestion. As I learned of the amazing variety of useful CPAN modules, I expanded the shell to load any module. If you're wondering how loading any module could lead to its interactive use without writing any additional view code, check out &autoView. This method automatically handles the views of common data structures. So what began as my own really tiny newbie database interface has grown into a gargantuan,mega-flexible,meta-executing shell or ... just simply a handy shell capable of loading most perl modules ;).


While scratching my own feature itches, I've strived to make the shell modular, lean and run-time manipulable. My later goal has recently led to an interesting shift in this shell's usage. By creating pre and post subs around the call of a command, the parsing of a command and viewing its results become automated for common data structures (ie hash,array,hashref). This allows me to call object and class methods directly from the commandline using the commands &objectAct and &classAct in Fry::Lib::Default. Soon, I aim to load a module without predefining libraries for it. I'll try to autodetect as many class and object methods. Object methods won't be easy to autodetect unless there's a consistent pod format for describing them. The next best thing I can do is show the user all methods and let them choose whom they belong to via a menu.

What ramifications does this have on using new modules? Instant interaction, the best way to learn what a module does! A user could load a library (or maybe just the module) with a command ie `\lL :DBI` and in the next command be able to autocomplete available methods for the specified class or object. Naturally, I'd extend autocompletion to a method's options. Having this level of interactivity would help create demos and handy mini-apps.

In summary here are the main goals of this shell framework:

        Be as lightweight,modular and run-time manipuable as possible.
        Load any module and use all of its methods from the commandline with minimal to no hard-coded
        Make the usage of methods and modules as easy as possible by autocompleting known
                options to methods, known methods to a module and ...
        View output in several ways, commandline and web for starters.

Miscellaneous ^


In comments throughout I consistently use abbreviations, usually followed by a colon ie 'td:'. Here they are:

        td: todo items
        ?: questions I have of surrounding code
        h: hacked items, usually an ugly hack that I should redo
        w: warning items, likely culprits if nearby code causes errors
        d: description items, describing a nearby subroutine usually 


I welcome anoyone who would like to help develop this shell. Currently, the only way to contribute code is through diff patches.

The TO DO section of Fry::Shell is an up-to-date list of features I plan on implementing. If you are fairly experienced in developing some of the features, I'd appreciate any advice or code you can give. For now, I'm looking for help with ReadLine modules, regular expression insight on creating grammar for parsing the commandline (similar to Zoidberg), logging and creating a cgi or mod_perl view.

If interest picks up, I'll sourceforge this project, mainly for use of the mailing list and online repository.

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