Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

Thanks. 

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

Closed #1215 via 180afaf3b1a7c5a3b8f31815fde1e398594e22fb.

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

This gets the job done:

```python
librpm = cdll.LoadLibrary("librpm.so.9")

# Load general configuration (such as macros defined in standard places)
# Second argument is target platform, NULL is the default
librpm.rpmReadConfigFiles(librpm.rpmcliRcfile, None)
```

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

My script doesn't seem to see system defined macros. Do I need to call 
something explicitly to load them?

```
$ rpmlua 

RPM Interactive Lua 5.3 Interpreter
> print(rpm.expand("%python3"))
%python3
> rpm.define("test b")
> print(rpm.expand("%test"))
b
> 


$ rpm --eval "%{lua:rpm.interactive()}"

RPM Interactive Lua 5.3 Interpreter
> print(rpm.expand("%python3"))
> 
/usr/bin/python3
```

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

Just a word of caution: rpmluaRunScript() and rpmluaRunScriptFile() are not 
considered public API and are not available in the public headers on C side, 
although the symbols are accessible in the ABI. So they are subject to change 
without further notice, although the likelihood of that happening doesn't seem 
that great, they've been exactly the way are since their inception 16 years 
ago...

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

Wonderfully weird stuff :smile: 

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

Here is my draft blog post about how to get a nicer console 
https://hackmd.io/@hroncok/SyNjuxcqL

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

Adding a native way to flush the output shouldn't be hard. This is code that 
for all practical purposes nobody has touched in 16 years so it's not 
surprising if its a bit rusty and squeaky...

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Vít Ondruch]

Or if there was a way to flush to the output the content collected by the macro 
engine 

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Vít Ondruch]

I think it could be enough if the documentation give more reasonable example 
such as:

~~~
rpm.expand("%{echo:some message}")
~~~

Which provides expected output:

~~~
$ rpm --eval "%{lua:rpm.interactive()}"

RPM Interactive Lua 5.3 Interpreter
> rpm.expand("%{echo:some message}")
some message
> rpm.expand("%{echo:%{_bindir}}")
/usr/bin
>
~~~

Or IDK what else one could be interested.

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

I meant something a bit more sophisticated. I have so far:

```python
#!/usr/bin/python3
import sys
from ctypes import cdll, c_char_p


librpmio = cdll.LoadLibrary("librpmio.so.9")

adjust_path = b"""
if os.getenv("LUA_PATH") then
package.path =  os.getenv("LUA_PATH") .. ";" .. package.path
end
"""

# first argument is an "rpmlua" pointer, but uses global one when NULL
# second argument is code
# third argument is "name", used in errors, reasonable default when NULL
librpmio.rpmluaRunScript(None, c_char_p(adjust_path), None)

if len(sys.argv) > 1:
sys.argv[-1] = '/dev/stdin' if sys.argv[-1] == '-' else sys.argv[-1]
# first argument as above, second argument is path
librpmio.rpmluaRunScriptFile(None, c_char_p(sys.argv[-1].encode("utf-8")))
else:
librpmio.rpmluaRunScript(None, c_char_p(b"rpm.interactive()"), None)
```

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

If by "something like the above" you mean something that allows actual 
interactive experience, sure :sweat_smile: 

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

I have it all figured out. Blog post coming. Would you consider adding 
something like the above to rpm itself? 

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Panu Matilainen]

Ouch :rofl: 

The interactive interpreter was added years before my time, but as far as I can 
recall, you're the first person *ever* to try actually using it. There may be 
some resident fauna there... :beetle: :bug:

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

This gets the job done:

```python
from ctypes import cdll, c_char_p
librpmio = cdll.LoadLibrary("librpmio.so.9")
librpmio.rpmluaRunScript(None, c_char_p(b"rpm.interactive()"), None)
```

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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

Can I do anything to have the interneter not in the macro expansion mode?

Dne st 13. 5. 2020 11:03 uživatel Michael Schroeder <
notificati...@github.com> napsal:

> This happens because you're in a macro expansion, so all the output is
> collected and returned to the macro engine.
>
> —
> You are receiving this because you authored the thread.
> Reply to this email directly, view it on GitHub
> ,
> or unsubscribe
> 
> .
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Re: [Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Michael Schroeder]

This happens because you're in a macro expansion, so all the output is 
collected and returned to the macro engine.

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[Rpm-maint] [rpm-software-management/rpm] rpm --eval "%{lua:rpm.interactive()}" does not immediately print the output (#1215)

[Miro Hrončok]

I'd liek to use the interactive Lua console, however, it doesn't seem to be 
very... interactive.

```
$ rpm --eval "%{lua:rpm.interactive()}"

RPM Interactive Lua 5.3 Interpreter
>
```

So far so good...

```
> print"a"
> 
```

Nothing...

```
> print"a"
> print"a"
> print"a"
> print"a"
>
```

Nothing...

```
> ^D
a
```

Is there a way to receive the output as I put the input?

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