Swap - (single dash) and = (equal sign) meaning

[caribpa]

Is your feature request related to a problem? Please describe.
This issue follows the same trend as #615 to standardize the special command line flags recognized when launching Rizin.

According to the POSIX Utility Syntax - Guideline 13:

For utilities that use operands to represent files to be opened for either reading or writing, the '-' operand should be used to mean only standard input (or standard output when it is clear from context that an output file is being specified) or a file named -.

Meaning: rz -, rz -d -, etc, shall treat - as an indicator to start Rizin and process the data coming from stdin, instead of loading the malloc://512 plugin.

Try it with any utility that reads a file:

$ echo hi | cat - > test
$ sed 's/./\U&/g' - < test
# HI

It shall be noted that using -- (double dash) before - doesn't change the meaning of - as stdin (see #615):

$ echo hi | cat -- - > test
$ sed 's/./\U&/g' -- - < test
# HI

Surprisingly, Rizin is able to read (more or less) from the standard input, but uses the = special flag.

Describe the solution you'd like
Swap the = and the - special command line flags recognized by Rizin as <file> parameter:

• - should read from stdin, following the standard for command line utilities
• = should load the malloc://512 plugin

$ rz - < /bin/rizin
# Starts Rizin and reads /bin/rizin from stdin

$ rz =
# Starts Rizin and loads the malloc://512 plugin

It shall be noted that currently reading from stdin doesn't truly work and mangles the terminal, see #617 (a reset solves it).

Describe alternatives you've considered
💔

Additional context
This behavior is also present in radare2.

[caribpa]

Due to the fact that = is used in Rizin's interactive command line to refer to the client/server family, maybe it is a good idea to either:

• Remove the = special flag from Rizin's startup flags to avoid possible confusion with the client/server = meaning in interactive mode
• Move the = special startup flag to --plugin m/-Pm (new) regular flags
• Move the = interactive client/server family command to R (new) interactive family command (short for "Remote")

[ret2libc]

This also seems to be reasonable to me.

[XVilka]

I think it would be a good fit for 0.2.0 to break things early and don't change the behavior later.

[wargio]

i like it

[fangxlmr]

@seanachao This issue is asigned to you as RSoC micro-task, so you could work on this from now on. Feel free to ask questions and send Pull Requests.

In case for anyone who is not aware about RSoC.

CC @XVilka

[seanachao]

There are some test question, I will continue to resolve it .