very good idea, and make CLI script install a lot simpler, thanks @mbabker !

Very cool

test almost good,
something went wrong on finder:index --purge

just curious, it is complicated to implement the suggestion on push Tab key?
example if finder has couple commands I type finder: push Tab key and I get list of possible commands

just curious, it is complicated to implement the suggestion on push Tab key?

I'd guess that depends highly on the operating system/shell/IDE you use, but it shouldn't be too complicated to set something up.
E.g. we have something in this direction set up for the JTracker here: https://github.com/joomla/jissues/blob/master/cli/Custom_jtracker.xml

EDIT This file is, of course, generated by one of our intelligent scripts https://github.com/joomla/jissues/blob/master/cli/Application/Command/Make/Autocomplete.php

Added the constant.

hm, http://www.php.net/manual/en/function.readline-completion-function.php looks not so dificult
in theory if each subcommand it just a filename, then we can make some method that return file names on Tab key press...

example component1 has command1.php and command2.php .. then user can type
component1: push Tab and the script return command1, command2

in theory

test good now

hm, http://www.php.net/manual/en/function.readline-completion-function.php looks not so dificult

IIRC per default PHP isn't compiled with readline support :(

If someone wants to give the readline support a go, they're more than welcome. I made a quick attempt and the function never got triggered.

@elkuku is right .. it is not so trivial as I thought https://github.com/MetalGuardian/yii2-bash-completion https://gist.github.com/cebe/1141050

I have tested this item successfully

I would add some default message if no arguments are supplied and, of course, colors and other nifty stuff we got implemented in JIssues and that a user would expect from a "modern" CLI application but - It's a great start - please commit soonish :)

@Fedik on the completion thingy: I found this: http://tech.zumba.com/2012/08/20/creating-bash-completion/
Seems like a neat idea - but only for bash users of course...

so there two way:

• make bash script, and include it in .bashrc or place it in /etc/bash_completion.d ... it only for Unix system, and require "additional move" from the User
• make Joomla Shell, similar like it is in Symfony Shell php app/console --shell ... here is used readline_completion_function()

well, maybe in some day, in the future ...

I went ahead and configured the default output object for the CLI class to support our color processor, so you can do something like this in a CLI command:

$this->getApplication()->out('<info>Give me some style!</info>');

Through the JApplicationCli API, you should also be able to fetch the output object and add in additional styles (or completely replace the output handler if you wanted).

@test ok

Very interesting Michael

RTC based on testing.

These scripts should be considered deprecated and removed at 4.0.

@mbabker so this will be a follow up PR if this gets merged?

I respect @mbabker decision to close it, but I still would like to see it (or similar solution) in Joomla, is there any chance, or I am alone here?

or I am alone here?

You're not. ;(

@Fedik no, you are not alone. It would be very nice that there is a unique solution for CLI scripts

may i join in ?
something similar was done in the past GSOC edition
https://www.youtube.com/watch?v=fIUYdzVvgzA

Just skimming through that video, the approach in place there is similar to what exists today with every CLI class directly extending JApplicationCli. This approach created a single application entry point and a dumbed down version of a router to handle the implementation. This PR doesn't stop folks from doing that, but instead makes a half hearted attempt to start a JApplicationCms like class for the CLI interface and make it a little easier to integrate CLI routines into components.