Re: Noweb Function's body without evaluation

[suarezmiguelc@icloud.com]

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Hello Ken, thank you for your message,

After reading the very interesting get_property function, I found that even though I will probably use it for some cases, it doesn’t apply directly, to my case.

For more examples, if I have 1 source code block:

>> #+name: greeting
>> #+begin_src sh :var name="world" :results output :session testing
>> 
>> echo "hello, $name\!"
>> #+end_src


I have three options in noweb to use this:
- Use its body into another begin_src source code block with <<greeting>>
- Use its result “hello, world!” Into another code block, which results in babel trying to execute the hello, command, which doesn’t exist, this with <<greeting()>>
- Use its result, the same as above, but with another parameter, results in the same but the variable name is different, so <<greeting(name=“another name”)>>

I’m trying to do the first, but with another parameter, so Use its body into another begin_src source code block with, get the resulting body after changing the variable without it being evaluated, so that I get a valid command to get to bash, like with <<greeting>>, but I can specify a different name variable.

I found the [:body] param but, even though it lets me change the variable as I want, it then tries to evaluate it, so I get a different value but the same hello, command doesn’t exist. Even though what I would want is to get echo “hello, $name\!” but, $name is different.

Thank you for your response Ken, I hope I gave a clearer example with the above.


> 16/3/23 5:16、Ken Mankoff <mankoff@gmail.com>のメール:
> 
> Hi,
> 
> I'm not sure that I understand your issue or needs from the provided examples, but I wonder if the example I provide here would be helpful. It bypasses :var an lets you inject a PROPERTY value anywhere. It is also language agnostic. You can use it to execute commands (that are set as PROPERTY values) or set variables to values.
> 
> https://lists.gnu.org/archive/html/emacs-orgmode/2023-03/msg00251.html
> 
>  -k.
> 
> On 2023-03-15 at 18:54 -04, suarezmiguelc@icloud.com wrote...
>> Hello Org-mode community. I’m using Emacs Doom Framework, specifically:
>> 
>> Emacs 28.2 (build 1, aarch64-apple-darwin22.3.0, Carbon Version 169
>> AppKit 2299.4) of 2023-02-23.
>> 
>> I use heavily org-mode for Literate DevOps, so I have a lot of shell
>> commands that connect through SSH and do some things later, for
>> example:
>> 
>> #+name: initSSH
>> #+begin_src shell :var connection=“admin@somehost"
>> 
>> ssh -t miguel@host "sudo -u someuser ssh -t $connection 'sudo su'"
>> #+end_src
>> 
>> So then I can call:
>> 
>> #+call: initSSH(connection=“admin@anotherhost”)
>> 
>> With any other header parameters or session, the above works
>> correctly. I cannot use tramp due to network latency issues, so this
>> is the most performance way for me, since I also have to do some
>> multi-hops which are indeed supported in tramp, but it is too slow for
>> me, so I rather only commands.
>> 
>> The thing is that, I then would like to call these not with a #+call
>> function, but add them into a bigger script, let’s say that I define
>> another command:
>> 
>> #+name: getStorage
>> #+begin_src shell
>> 
>> df
>> #+end_src
>> 
>> Which has to be run in a remote server, could be any remote server as
>> I have to connect to several. So I would like to be able to:
>> 
>> #+begin_src shell
>> <<initSSH(connection=“admin@anotherhost”)>>
>> <<getStorage>>
>> #+end_src
>> 
>> 
>> The first doesn’t work as org-mode runs the code and passes the
>> resulting string to bash, which isn’t a command. The latter works
>> normally. So the issue here are the parameters.
>> 
>> So I made another simple example for this:
>> 
>> #+name: greeting
>> #+begin_src sh :var name="world" :results output :session testing
>> 
>> echo "hello, $name\!"
>> #+end_src
>> 
>> #+results: greeting
>> #+begin_src sh
>> 
>> hello, world\!
>> #+end_src
>> 
>> #+begin_src shell
>> <<greeting(name="ss")>>
>> #+end_src
>> 
>> 
>> This results in sh: hello,: command not found, as it is executing the function. I see in the documentation that I can:
>> - Call a function’s body with <<namedcodeblock>>
>> - Execute a function and return its results with <<namedcodeblock()>>
>> - Execute a function and return its results even with different params with <<namedcodeblock(param=“sds”)>>
>> 
>> So right now, the one that’s missing is, call a function’s body with different parameters. So the
>> function <<namedcodeblock>> is not evaluated.
>> 
>> After searching a lot, I came across:
>> 
>> #+begin_src shell :session testing
>> <<greeting[:body](name="Testingggg")>>
>> #+end_src
>> 
>> Which results in:
>> 
>> sh-3.2$ PS1="org_babel_sh_prompt> "
>> org_babel_sh_prompt> name='Testingggg'
>> org_babel_sh_prompt> echo "hello, $name\!"
>> hello, Testingggg\!
>> org_babel_sh_prompt> echo 'org_babel_sh_eoe'
>> org_babel_sh_eoe
>> org_babel_sh_prompt> hello, Testingggg\!
>> sh: hello,: command not found
>> org_babel_sh_prompt> echo 'org_babel_sh_eoe'
>> org_babel_sh_eoe
>> org_babel_sh_prompt> 
>> 
>> Which is somewhat what I need since at least the variable is changed,
>> but the result of this execution is also passed to shell so, same
>> error.
>> 
>> I can’t find much documentation about this, what is the correct syntax
>> here?,
>> 
>> Thank you!
> 


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