Hi Adam and Eric for your further comments!

I had read a bit about the =rx= package but not used it, thanks for the pointer to =xr=, makes it a lot easier to figure out the syntax.

One more thing I realized is that I can make the desired settings the defaults within my document, and even automatically wrap all blocks with the =script= command, by setting the corresponding properties:

#+property: header-args:sh+ :exports output

#+property: header-args:sh+ :results output

#+property: header-args:sh+ :wrap "src console"

#+property: header-args:sh+ :post cleanup(data=*this*)

#+property: header-args:sh+ :prologue "script <<EOF" :epilogue "EOF"

Then I can write plain =#+begin_src sh= blocks and they will produce the result I want.

I love org and its community - thanks again!

--Diego

On Fri, Feb 7, 2020 at 5:07 PM Adam Porter <adam@alphapapa.net> wrote:

Diego Zamboni <diego@zzamboni.org> writes:

> I came up with the following block, which cleans up all the cruft from
> the output of the =script= command and produces a nicely formatted
> session transcript:
>
> #+NAME: cleanup
> #+BEGIN_SRC emacs-lisp :var data="" :results value :exports none
> (replace-regexp-in-string
> "\\$ exit\$.\\|\n\$*$" ""
> (replace-regexp-in-string
> "^bash-.*\\$" "$"
> (replace-regexp-in-string
> "\$\\(.\\|\n\$*?\\)\\$\$.\\|\n\$*\\'" ""
> (replace-regexp-in-string "
> " "" data) nil nil 1)))
> #+END_SRC
>
> (I am not happy with the regexp nesting and repetition above, I am not
> an expert yet in emacs-lisp regex facilities. Suggestions appreciated
> for how to simplify it).

Hi Diego,

A few suggestions:

1. You can use `rx' to define regexps in a Lispy way, and the ELPA
package `xr' converts existing regexp strings to the rx format, which
can help in learning rx syntax. For example:

(xr "^bash-.*\\$" 'brief) ;;=> (seq bol "bash-" (0+ nonl) "$")

So you can use that regexp like:

(replace-regexp-in-string (rx bol "bash-" (0+ nonl) "$") ...)

This nasty one is much easier with rx:

(xr "\$\\(.\\|\n\$*?\\)\\$\$.\\|\n\$*\\'" 'brief)
;;=>
;; (seq (group (*? (group anything)))
;; "$" (0+ (group anything)) eos)

2. To avoid the nested calls, you can use a loop, like:

(cl-loop for (match replace) in
(list (list (rx foo bar) "replacement"))
do (setf string
(replace-regexp-in-string match replace
string)))